[PATCH RFC 20/20] binder: delete the C implementation

From: Alice Ryhl
Date: Wed Nov 01 2023 - 14:04:14 EST

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The ultimate goal of this project is to replace the C implementation.

Signed-off-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
---
drivers/android/Kconfig | 36 -
drivers/android/binder.c | 6630 ----------------------------------------
drivers/android/binder_alloc.c | 1284 --------
drivers/android/binderfs.c | 827 -----
4 files changed, 8777 deletions(-)

diff --git a/drivers/android/Kconfig b/drivers/android/Kconfig
index 82ed6ddabe1a..8b8badd87dc5 100644
--- a/drivers/android/Kconfig
+++ b/drivers/android/Kconfig
@@ -1,18 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
menu "Android"

-config ANDROID_BINDER_IPC
- bool "Android Binder IPC Driver"
- depends on MMU
- default n
- help
- Binder is used in Android for both communication between processes,
- and remote method invocation.
-
- This means one Android process can call a method/routine in another
- Android process, using Binder to identify, invoke and pass arguments
- between said processes.
-
config ANDROID_BINDER_IPC_RUST
bool "Android Binder IPC Driver in Rust"
depends on MMU && RUST
@@ -24,18 +12,6 @@ config ANDROID_BINDER_IPC_RUST
Android process, using Binder to identify, invoke and pass arguments
between said processes.

-config ANDROID_BINDERFS
- bool "Android Binderfs filesystem"
- depends on ANDROID_BINDER_IPC
- default n
- help
- Binderfs is a pseudo-filesystem for the Android Binder IPC driver
- which can be mounted per-ipc namespace allowing to run multiple
- instances of Android.
- Each binderfs mount initially only contains a binder-control device.
- It can be used to dynamically allocate new binder IPC devices via
- ioctls.
-
config ANDROID_BINDERFS_RUST
bool "Android Binderfs filesystem in Rust"
depends on ANDROID_BINDER_IPC_RUST
@@ -48,18 +24,6 @@ config ANDROID_BINDERFS_RUST
It can be used to dynamically allocate new binder IPC devices via
ioctls.

-config ANDROID_BINDER_DEVICES
- string "Android Binder devices"
- depends on ANDROID_BINDER_IPC
- default "binder,hwbinder,vndbinder"
- help
- Default value for the binder.devices parameter.
-
- The binder.devices parameter is a comma-separated list of strings
- that specifies the names of the binder device nodes that will be
- created. Each binder device has its own context manager, and is
- therefore logically separated from the other devices.
-
config ANDROID_BINDER_DEVICES_RUST
string "Android Binder devices in Rust"
depends on ANDROID_BINDER_IPC_RUST
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
deleted file mode 100644
index 92128aae2d06..000000000000
--- a/drivers/android/binder.c
+++ /dev/null
@@ -1,6630 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* binder.c
- *
- * Android IPC Subsystem
- *
- * Copyright (C) 2007-2008 Google, Inc.
- */
-
-/*
- * Locking overview
- *
- * There are 3 main spinlocks which must be acquired in the
- * order shown:
- *
- * 1) proc->outer_lock : protects binder_ref
- * binder_proc_lock() and binder_proc_unlock() are
- * used to acq/rel.
- * 2) node->lock : protects most fields of binder_node.
- * binder_node_lock() and binder_node_unlock() are
- * used to acq/rel
- * 3) proc->inner_lock : protects the thread and node lists
- * (proc->threads, proc->waiting_threads, proc->nodes)
- * and all todo lists associated with the binder_proc
- * (proc->todo, thread->todo, proc->delivered_death and
- * node->async_todo), as well as thread->transaction_stack
- * binder_inner_proc_lock() and binder_inner_proc_unlock()
- * are used to acq/rel
- *
- * Any lock under procA must never be nested under any lock at the same
- * level or below on procB.
- *
- * Functions that require a lock held on entry indicate which lock
- * in the suffix of the function name:
- *
- * foo_olocked() : requires node->outer_lock
- * foo_nlocked() : requires node->lock
- * foo_ilocked() : requires proc->inner_lock
- * foo_oilocked(): requires proc->outer_lock and proc->inner_lock
- * foo_nilocked(): requires node->lock and proc->inner_lock
- * ...
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/fdtable.h>
-#include <linux/file.h>
-#include <linux/freezer.h>
-#include <linux/fs.h>
-#include <linux/list.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/nsproxy.h>
-#include <linux/poll.h>
-#include <linux/debugfs.h>
-#include <linux/rbtree.h>
-#include <linux/sched/signal.h>
-#include <linux/sched/mm.h>
-#include <linux/seq_file.h>
-#include <linux/string.h>
-#include <linux/uaccess.h>
-#include <linux/pid_namespace.h>
-#include <linux/security.h>
-#include <linux/spinlock.h>
-#include <linux/ratelimit.h>
-#include <linux/syscalls.h>
-#include <linux/task_work.h>
-#include <linux/sizes.h>
-#include <linux/ktime.h>
-
-#include <uapi/linux/android/binder.h>
-
-#include <linux/cacheflush.h>
-
-#include "binder_internal.h"
-#include "binder_trace.h"
-
-static HLIST_HEAD(binder_deferred_list);
-static DEFINE_MUTEX(binder_deferred_lock);
-
-static HLIST_HEAD(binder_devices);
-static HLIST_HEAD(binder_procs);
-static DEFINE_MUTEX(binder_procs_lock);
-
-static HLIST_HEAD(binder_dead_nodes);
-static DEFINE_SPINLOCK(binder_dead_nodes_lock);
-
-static struct dentry *binder_debugfs_dir_entry_root;
-static struct dentry *binder_debugfs_dir_entry_proc;
-static atomic_t binder_last_id;
-
-static int proc_show(struct seq_file *m, void *unused);
-DEFINE_SHOW_ATTRIBUTE(proc);
-
-#define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
-
-enum {
- BINDER_DEBUG_USER_ERROR = 1U << 0,
- BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1,
- BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2,
- BINDER_DEBUG_OPEN_CLOSE = 1U << 3,
- BINDER_DEBUG_DEAD_BINDER = 1U << 4,
- BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5,
- BINDER_DEBUG_READ_WRITE = 1U << 6,
- BINDER_DEBUG_USER_REFS = 1U << 7,
- BINDER_DEBUG_THREADS = 1U << 8,
- BINDER_DEBUG_TRANSACTION = 1U << 9,
- BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10,
- BINDER_DEBUG_FREE_BUFFER = 1U << 11,
- BINDER_DEBUG_INTERNAL_REFS = 1U << 12,
- BINDER_DEBUG_PRIORITY_CAP = 1U << 13,
- BINDER_DEBUG_SPINLOCKS = 1U << 14,
-};
-static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
- BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
-module_param_named(debug_mask, binder_debug_mask, uint, 0644);
-
-char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;
-module_param_named(devices, binder_devices_param, charp, 0444);
-
-static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
-static int binder_stop_on_user_error;
-
-static int binder_set_stop_on_user_error(const char *val,
- const struct kernel_param *kp)
-{
- int ret;
-
- ret = param_set_int(val, kp);
- if (binder_stop_on_user_error < 2)
- wake_up(&binder_user_error_wait);
- return ret;
-}
-module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
- param_get_int, &binder_stop_on_user_error, 0644);
-
-static __printf(2, 3) void binder_debug(int mask, const char *format, ...)
-{
- struct va_format vaf;
- va_list args;
-
- if (binder_debug_mask & mask) {
- va_start(args, format);
- vaf.va = &args;
- vaf.fmt = format;
- pr_info_ratelimited("%pV", &vaf);
- va_end(args);
- }
-}
-
-#define binder_txn_error(x...) \
- binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, x)
-
-static __printf(1, 2) void binder_user_error(const char *format, ...)
-{
- struct va_format vaf;
- va_list args;
-
- if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) {
- va_start(args, format);
- vaf.va = &args;
- vaf.fmt = format;
- pr_info_ratelimited("%pV", &vaf);
- va_end(args);
- }
-
- if (binder_stop_on_user_error)
- binder_stop_on_user_error = 2;
-}
-
-#define binder_set_extended_error(ee, _id, _command, _param) \
- do { \
- (ee)->id = _id; \
- (ee)->command = _command; \
- (ee)->param = _param; \
- } while (0)
-
-#define to_flat_binder_object(hdr) \
- container_of(hdr, struct flat_binder_object, hdr)
-
-#define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr)
-
-#define to_binder_buffer_object(hdr) \
- container_of(hdr, struct binder_buffer_object, hdr)
-
-#define to_binder_fd_array_object(hdr) \
- container_of(hdr, struct binder_fd_array_object, hdr)
-
-static struct binder_stats binder_stats;
-
-static inline void binder_stats_deleted(enum binder_stat_types type)
-{
- atomic_inc(&binder_stats.obj_deleted[type]);
-}
-
-static inline void binder_stats_created(enum binder_stat_types type)
-{
- atomic_inc(&binder_stats.obj_created[type]);
-}
-
-struct binder_transaction_log_entry {
- int debug_id;
- int debug_id_done;
- int call_type;
- int from_proc;
- int from_thread;
- int target_handle;
- int to_proc;
- int to_thread;
- int to_node;
- int data_size;
- int offsets_size;
- int return_error_line;
- uint32_t return_error;
- uint32_t return_error_param;
- char context_name[BINDERFS_MAX_NAME + 1];
-};
-
-struct binder_transaction_log {
- atomic_t cur;
- bool full;
- struct binder_transaction_log_entry entry[32];
-};
-
-static struct binder_transaction_log binder_transaction_log;
-static struct binder_transaction_log binder_transaction_log_failed;
-
-static struct binder_transaction_log_entry *binder_transaction_log_add(
- struct binder_transaction_log *log)
-{
- struct binder_transaction_log_entry *e;
- unsigned int cur = atomic_inc_return(&log->cur);
-
- if (cur >= ARRAY_SIZE(log->entry))
- log->full = true;
- e = &log->entry[cur % ARRAY_SIZE(log->entry)];
- WRITE_ONCE(e->debug_id_done, 0);
- /*
- * write-barrier to synchronize access to e->debug_id_done.
- * We make sure the initialized 0 value is seen before
- * memset() other fields are zeroed by memset.
- */
- smp_wmb();
- memset(e, 0, sizeof(*e));
- return e;
-}
-
-enum binder_deferred_state {
- BINDER_DEFERRED_FLUSH = 0x01,
- BINDER_DEFERRED_RELEASE = 0x02,
-};
-
-enum {
- BINDER_LOOPER_STATE_REGISTERED = 0x01,
- BINDER_LOOPER_STATE_ENTERED = 0x02,
- BINDER_LOOPER_STATE_EXITED = 0x04,
- BINDER_LOOPER_STATE_INVALID = 0x08,
- BINDER_LOOPER_STATE_WAITING = 0x10,
- BINDER_LOOPER_STATE_POLL = 0x20,
-};
-
-/**
- * binder_proc_lock() - Acquire outer lock for given binder_proc
- * @proc: struct binder_proc to acquire
- *
- * Acquires proc->outer_lock. Used to protect binder_ref
- * structures associated with the given proc.
- */
-#define binder_proc_lock(proc) _binder_proc_lock(proc, __LINE__)
-static void
-_binder_proc_lock(struct binder_proc *proc, int line)
- __acquires(&proc->outer_lock)
-{
- binder_debug(BINDER_DEBUG_SPINLOCKS,
- "%s: line=%d\n", __func__, line);
- spin_lock(&proc->outer_lock);
-}
-
-/**
- * binder_proc_unlock() - Release spinlock for given binder_proc
- * @proc: struct binder_proc to acquire
- *
- * Release lock acquired via binder_proc_lock()
- */
-#define binder_proc_unlock(proc) _binder_proc_unlock(proc, __LINE__)
-static void
-_binder_proc_unlock(struct binder_proc *proc, int line)
- __releases(&proc->outer_lock)
-{
- binder_debug(BINDER_DEBUG_SPINLOCKS,
- "%s: line=%d\n", __func__, line);
- spin_unlock(&proc->outer_lock);
-}
-
-/**
- * binder_inner_proc_lock() - Acquire inner lock for given binder_proc
- * @proc: struct binder_proc to acquire
- *
- * Acquires proc->inner_lock. Used to protect todo lists
- */
-#define binder_inner_proc_lock(proc) _binder_inner_proc_lock(proc, __LINE__)
-static void
-_binder_inner_proc_lock(struct binder_proc *proc, int line)
- __acquires(&proc->inner_lock)
-{
- binder_debug(BINDER_DEBUG_SPINLOCKS,
- "%s: line=%d\n", __func__, line);
- spin_lock(&proc->inner_lock);
-}
-
-/**
- * binder_inner_proc_unlock() - Release inner lock for given binder_proc
- * @proc: struct binder_proc to acquire
- *
- * Release lock acquired via binder_inner_proc_lock()
- */
-#define binder_inner_proc_unlock(proc) _binder_inner_proc_unlock(proc, __LINE__)
-static void
-_binder_inner_proc_unlock(struct binder_proc *proc, int line)
- __releases(&proc->inner_lock)
-{
- binder_debug(BINDER_DEBUG_SPINLOCKS,
- "%s: line=%d\n", __func__, line);
- spin_unlock(&proc->inner_lock);
-}
-
-/**
- * binder_node_lock() - Acquire spinlock for given binder_node
- * @node: struct binder_node to acquire
- *
- * Acquires node->lock. Used to protect binder_node fields
- */
-#define binder_node_lock(node) _binder_node_lock(node, __LINE__)
-static void
-_binder_node_lock(struct binder_node *node, int line)
- __acquires(&node->lock)
-{
- binder_debug(BINDER_DEBUG_SPINLOCKS,
- "%s: line=%d\n", __func__, line);
- spin_lock(&node->lock);
-}
-
-/**
- * binder_node_unlock() - Release spinlock for given binder_proc
- * @node: struct binder_node to acquire
- *
- * Release lock acquired via binder_node_lock()
- */
-#define binder_node_unlock(node) _binder_node_unlock(node, __LINE__)
-static void
-_binder_node_unlock(struct binder_node *node, int line)
- __releases(&node->lock)
-{
- binder_debug(BINDER_DEBUG_SPINLOCKS,
- "%s: line=%d\n", __func__, line);
- spin_unlock(&node->lock);
-}
-
-/**
- * binder_node_inner_lock() - Acquire node and inner locks
- * @node: struct binder_node to acquire
- *
- * Acquires node->lock. If node->proc also acquires
- * proc->inner_lock. Used to protect binder_node fields
- */
-#define binder_node_inner_lock(node) _binder_node_inner_lock(node, __LINE__)
-static void
-_binder_node_inner_lock(struct binder_node *node, int line)
- __acquires(&node->lock) __acquires(&node->proc->inner_lock)
-{
- binder_debug(BINDER_DEBUG_SPINLOCKS,
- "%s: line=%d\n", __func__, line);
- spin_lock(&node->lock);
- if (node->proc)
- binder_inner_proc_lock(node->proc);
- else
- /* annotation for sparse */
- __acquire(&node->proc->inner_lock);
-}
-
-/**
- * binder_node_inner_unlock() - Release node and inner locks
- * @node: struct binder_node to acquire
- *
- * Release lock acquired via binder_node_lock()
- */
-#define binder_node_inner_unlock(node) _binder_node_inner_unlock(node, __LINE__)
-static void
-_binder_node_inner_unlock(struct binder_node *node, int line)
- __releases(&node->lock) __releases(&node->proc->inner_lock)
-{
- struct binder_proc *proc = node->proc;
-
- binder_debug(BINDER_DEBUG_SPINLOCKS,
- "%s: line=%d\n", __func__, line);
- if (proc)
- binder_inner_proc_unlock(proc);
- else
- /* annotation for sparse */
- __release(&node->proc->inner_lock);
- spin_unlock(&node->lock);
-}
-
-static bool binder_worklist_empty_ilocked(struct list_head *list)
-{
- return list_empty(list);
-}
-
-/**
- * binder_worklist_empty() - Check if no items on the work list
- * @proc: binder_proc associated with list
- * @list: list to check
- *
- * Return: true if there are no items on list, else false
- */
-static bool binder_worklist_empty(struct binder_proc *proc,
- struct list_head *list)
-{
- bool ret;
-
- binder_inner_proc_lock(proc);
- ret = binder_worklist_empty_ilocked(list);
- binder_inner_proc_unlock(proc);
- return ret;
-}
-
-/**
- * binder_enqueue_work_ilocked() - Add an item to the work list
- * @work: struct binder_work to add to list
- * @target_list: list to add work to
- *
- * Adds the work to the specified list. Asserts that work
- * is not already on a list.
- *
- * Requires the proc->inner_lock to be held.
- */
-static void
-binder_enqueue_work_ilocked(struct binder_work *work,
- struct list_head *target_list)
-{
- BUG_ON(target_list == NULL);
- BUG_ON(work->entry.next && !list_empty(&work->entry));
- list_add_tail(&work->entry, target_list);
-}
-
-/**
- * binder_enqueue_deferred_thread_work_ilocked() - Add deferred thread work
- * @thread: thread to queue work to
- * @work: struct binder_work to add to list
- *
- * Adds the work to the todo list of the thread. Doesn't set the process_todo
- * flag, which means that (if it wasn't already set) the thread will go to
- * sleep without handling this work when it calls read.
- *
- * Requires the proc->inner_lock to be held.
- */
-static void
-binder_enqueue_deferred_thread_work_ilocked(struct binder_thread *thread,
- struct binder_work *work)
-{
- WARN_ON(!list_empty(&thread->waiting_thread_node));
- binder_enqueue_work_ilocked(work, &thread->todo);
-}
-
-/**
- * binder_enqueue_thread_work_ilocked() - Add an item to the thread work list
- * @thread: thread to queue work to
- * @work: struct binder_work to add to list
- *
- * Adds the work to the todo list of the thread, and enables processing
- * of the todo queue.
- *
- * Requires the proc->inner_lock to be held.
- */
-static void
-binder_enqueue_thread_work_ilocked(struct binder_thread *thread,
- struct binder_work *work)
-{
- WARN_ON(!list_empty(&thread->waiting_thread_node));
- binder_enqueue_work_ilocked(work, &thread->todo);
- thread->process_todo = true;
-}
-
-/**
- * binder_enqueue_thread_work() - Add an item to the thread work list
- * @thread: thread to queue work to
- * @work: struct binder_work to add to list
- *
- * Adds the work to the todo list of the thread, and enables processing
- * of the todo queue.
- */
-static void
-binder_enqueue_thread_work(struct binder_thread *thread,
- struct binder_work *work)
-{
- binder_inner_proc_lock(thread->proc);
- binder_enqueue_thread_work_ilocked(thread, work);
- binder_inner_proc_unlock(thread->proc);
-}
-
-static void
-binder_dequeue_work_ilocked(struct binder_work *work)
-{
- list_del_init(&work->entry);
-}
-
-/**
- * binder_dequeue_work() - Removes an item from the work list
- * @proc: binder_proc associated with list
- * @work: struct binder_work to remove from list
- *
- * Removes the specified work item from whatever list it is on.
- * Can safely be called if work is not on any list.
- */
-static void
-binder_dequeue_work(struct binder_proc *proc, struct binder_work *work)
-{
- binder_inner_proc_lock(proc);
- binder_dequeue_work_ilocked(work);
- binder_inner_proc_unlock(proc);
-}
-
-static struct binder_work *binder_dequeue_work_head_ilocked(
- struct list_head *list)
-{
- struct binder_work *w;
-
- w = list_first_entry_or_null(list, struct binder_work, entry);
- if (w)
- list_del_init(&w->entry);
- return w;
-}
-
-static void
-binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
-static void binder_free_thread(struct binder_thread *thread);
-static void binder_free_proc(struct binder_proc *proc);
-static void binder_inc_node_tmpref_ilocked(struct binder_node *node);
-
-static bool binder_has_work_ilocked(struct binder_thread *thread,
- bool do_proc_work)
-{
- return thread->process_todo ||
- thread->looper_need_return ||
- (do_proc_work &&
- !binder_worklist_empty_ilocked(&thread->proc->todo));
-}
-
-static bool binder_has_work(struct binder_thread *thread, bool do_proc_work)
-{
- bool has_work;
-
- binder_inner_proc_lock(thread->proc);
- has_work = binder_has_work_ilocked(thread, do_proc_work);
- binder_inner_proc_unlock(thread->proc);
-
- return has_work;
-}
-
-static bool binder_available_for_proc_work_ilocked(struct binder_thread *thread)
-{
- return !thread->transaction_stack &&
- binder_worklist_empty_ilocked(&thread->todo) &&
- (thread->looper & (BINDER_LOOPER_STATE_ENTERED |
- BINDER_LOOPER_STATE_REGISTERED));
-}
-
-static void binder_wakeup_poll_threads_ilocked(struct binder_proc *proc,
- bool sync)
-{
- struct rb_node *n;
- struct binder_thread *thread;
-
- for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
- thread = rb_entry(n, struct binder_thread, rb_node);
- if (thread->looper & BINDER_LOOPER_STATE_POLL &&
- binder_available_for_proc_work_ilocked(thread)) {
- if (sync)
- wake_up_interruptible_sync(&thread->wait);
- else
- wake_up_interruptible(&thread->wait);
- }
- }
-}
-
-/**
- * binder_select_thread_ilocked() - selects a thread for doing proc work.
- * @proc: process to select a thread from
- *
- * Note that calling this function moves the thread off the waiting_threads
- * list, so it can only be woken up by the caller of this function, or a
- * signal. Therefore, callers *should* always wake up the thread this function
- * returns.
- *
- * Return: If there's a thread currently waiting for process work,
- * returns that thread. Otherwise returns NULL.
- */
-static struct binder_thread *
-binder_select_thread_ilocked(struct binder_proc *proc)
-{
- struct binder_thread *thread;
-
- assert_spin_locked(&proc->inner_lock);
- thread = list_first_entry_or_null(&proc->waiting_threads,
- struct binder_thread,
- waiting_thread_node);
-
- if (thread)
- list_del_init(&thread->waiting_thread_node);
-
- return thread;
-}
-
-/**
- * binder_wakeup_thread_ilocked() - wakes up a thread for doing proc work.
- * @proc: process to wake up a thread in
- * @thread: specific thread to wake-up (may be NULL)
- * @sync: whether to do a synchronous wake-up
- *
- * This function wakes up a thread in the @proc process.
- * The caller may provide a specific thread to wake-up in
- * the @thread parameter. If @thread is NULL, this function
- * will wake up threads that have called poll().
- *
- * Note that for this function to work as expected, callers
- * should first call binder_select_thread() to find a thread
- * to handle the work (if they don't have a thread already),
- * and pass the result into the @thread parameter.
- */
-static void binder_wakeup_thread_ilocked(struct binder_proc *proc,
- struct binder_thread *thread,
- bool sync)
-{
- assert_spin_locked(&proc->inner_lock);
-
- if (thread) {
- if (sync)
- wake_up_interruptible_sync(&thread->wait);
- else
- wake_up_interruptible(&thread->wait);
- return;
- }
-
- /* Didn't find a thread waiting for proc work; this can happen
- * in two scenarios:
- * 1. All threads are busy handling transactions
- * In that case, one of those threads should call back into
- * the kernel driver soon and pick up this work.
- * 2. Threads are using the (e)poll interface, in which case
- * they may be blocked on the waitqueue without having been
- * added to waiting_threads. For this case, we just iterate
- * over all threads not handling transaction work, and
- * wake them all up. We wake all because we don't know whether
- * a thread that called into (e)poll is handling non-binder
- * work currently.
- */
- binder_wakeup_poll_threads_ilocked(proc, sync);
-}
-
-static void binder_wakeup_proc_ilocked(struct binder_proc *proc)
-{
- struct binder_thread *thread = binder_select_thread_ilocked(proc);
-
- binder_wakeup_thread_ilocked(proc, thread, /* sync = */false);
-}
-
-static void binder_set_nice(long nice)
-{
- long min_nice;
-
- if (can_nice(current, nice)) {
- set_user_nice(current, nice);
- return;
- }
- min_nice = rlimit_to_nice(rlimit(RLIMIT_NICE));
- binder_debug(BINDER_DEBUG_PRIORITY_CAP,
- "%d: nice value %ld not allowed use %ld instead\n",
- current->pid, nice, min_nice);
- set_user_nice(current, min_nice);
- if (min_nice <= MAX_NICE)
- return;
- binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
-}
-
-static struct binder_node *binder_get_node_ilocked(struct binder_proc *proc,
- binder_uintptr_t ptr)
-{
- struct rb_node *n = proc->nodes.rb_node;
- struct binder_node *node;
-
- assert_spin_locked(&proc->inner_lock);
-
- while (n) {
- node = rb_entry(n, struct binder_node, rb_node);
-
- if (ptr < node->ptr)
- n = n->rb_left;
- else if (ptr > node->ptr)
- n = n->rb_right;
- else {
- /*
- * take an implicit weak reference
- * to ensure node stays alive until
- * call to binder_put_node()
- */
- binder_inc_node_tmpref_ilocked(node);
- return node;
- }
- }
- return NULL;
-}
-
-static struct binder_node *binder_get_node(struct binder_proc *proc,
- binder_uintptr_t ptr)
-{
- struct binder_node *node;
-
- binder_inner_proc_lock(proc);
- node = binder_get_node_ilocked(proc, ptr);
- binder_inner_proc_unlock(proc);
- return node;
-}
-
-static struct binder_node *binder_init_node_ilocked(
- struct binder_proc *proc,
- struct binder_node *new_node,
- struct flat_binder_object *fp)
-{
- struct rb_node **p = &proc->nodes.rb_node;
- struct rb_node *parent = NULL;
- struct binder_node *node;
- binder_uintptr_t ptr = fp ? fp->binder : 0;
- binder_uintptr_t cookie = fp ? fp->cookie : 0;
- __u32 flags = fp ? fp->flags : 0;
-
- assert_spin_locked(&proc->inner_lock);
-
- while (*p) {
-
- parent = *p;
- node = rb_entry(parent, struct binder_node, rb_node);
-
- if (ptr < node->ptr)
- p = &(*p)->rb_left;
- else if (ptr > node->ptr)
- p = &(*p)->rb_right;
- else {
- /*
- * A matching node is already in
- * the rb tree. Abandon the init
- * and return it.
- */
- binder_inc_node_tmpref_ilocked(node);
- return node;
- }
- }
- node = new_node;
- binder_stats_created(BINDER_STAT_NODE);
- node->tmp_refs++;
- rb_link_node(&node->rb_node, parent, p);
- rb_insert_color(&node->rb_node, &proc->nodes);
- node->debug_id = atomic_inc_return(&binder_last_id);
- node->proc = proc;
- node->ptr = ptr;
- node->cookie = cookie;
- node->work.type = BINDER_WORK_NODE;
- node->min_priority = flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
- node->accept_fds = !!(flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
- node->txn_security_ctx = !!(flags & FLAT_BINDER_FLAG_TXN_SECURITY_CTX);
- spin_lock_init(&node->lock);
- INIT_LIST_HEAD(&node->work.entry);
- INIT_LIST_HEAD(&node->async_todo);
- binder_debug(BINDER_DEBUG_INTERNAL_REFS,
- "%d:%d node %d u%016llx c%016llx created\n",
- proc->pid, current->pid, node->debug_id,
- (u64)node->ptr, (u64)node->cookie);
-
- return node;
-}
-
-static struct binder_node *binder_new_node(struct binder_proc *proc,
- struct flat_binder_object *fp)
-{
- struct binder_node *node;
- struct binder_node *new_node = kzalloc(sizeof(*node), GFP_KERNEL);
-
- if (!new_node)
- return NULL;
- binder_inner_proc_lock(proc);
- node = binder_init_node_ilocked(proc, new_node, fp);
- binder_inner_proc_unlock(proc);
- if (node != new_node)
- /*
- * The node was already added by another thread
- */
- kfree(new_node);
-
- return node;
-}
-
-static void binder_free_node(struct binder_node *node)
-{
- kfree(node);
- binder_stats_deleted(BINDER_STAT_NODE);
-}
-
-static int binder_inc_node_nilocked(struct binder_node *node, int strong,
- int internal,
- struct list_head *target_list)
-{
- struct binder_proc *proc = node->proc;
-
- assert_spin_locked(&node->lock);
- if (proc)
- assert_spin_locked(&proc->inner_lock);
- if (strong) {
- if (internal) {
- if (target_list == NULL &&
- node->internal_strong_refs == 0 &&
- !(node->proc &&
- node == node->proc->context->binder_context_mgr_node &&
- node->has_strong_ref)) {
- pr_err("invalid inc strong node for %d\n",
- node->debug_id);
- return -EINVAL;
- }
- node->internal_strong_refs++;
- } else
- node->local_strong_refs++;
- if (!node->has_strong_ref && target_list) {
- struct binder_thread *thread = container_of(target_list,
- struct binder_thread, todo);
- binder_dequeue_work_ilocked(&node->work);
- BUG_ON(&thread->todo != target_list);
- binder_enqueue_deferred_thread_work_ilocked(thread,
- &node->work);
- }
- } else {
- if (!internal)
- node->local_weak_refs++;
- if (!node->has_weak_ref && list_empty(&node->work.entry)) {
- if (target_list == NULL) {
- pr_err("invalid inc weak node for %d\n",
- node->debug_id);
- return -EINVAL;
- }
- /*
- * See comment above
- */
- binder_enqueue_work_ilocked(&node->work, target_list);
- }
- }
- return 0;
-}
-
-static int binder_inc_node(struct binder_node *node, int strong, int internal,
- struct list_head *target_list)
-{
- int ret;
-
- binder_node_inner_lock(node);
- ret = binder_inc_node_nilocked(node, strong, internal, target_list);
- binder_node_inner_unlock(node);
-
- return ret;
-}
-
-static bool binder_dec_node_nilocked(struct binder_node *node,
- int strong, int internal)
-{
- struct binder_proc *proc = node->proc;
-
- assert_spin_locked(&node->lock);
- if (proc)
- assert_spin_locked(&proc->inner_lock);
- if (strong) {
- if (internal)
- node->internal_strong_refs--;
- else
- node->local_strong_refs--;
- if (node->local_strong_refs || node->internal_strong_refs)
- return false;
- } else {
- if (!internal)
- node->local_weak_refs--;
- if (node->local_weak_refs || node->tmp_refs ||
- !hlist_empty(&node->refs))
- return false;
- }
-
- if (proc && (node->has_strong_ref || node->has_weak_ref)) {
- if (list_empty(&node->work.entry)) {
- binder_enqueue_work_ilocked(&node->work, &proc->todo);
- binder_wakeup_proc_ilocked(proc);
- }
- } else {
- if (hlist_empty(&node->refs) && !node->local_strong_refs &&
- !node->local_weak_refs && !node->tmp_refs) {
- if (proc) {
- binder_dequeue_work_ilocked(&node->work);
- rb_erase(&node->rb_node, &proc->nodes);
- binder_debug(BINDER_DEBUG_INTERNAL_REFS,
- "refless node %d deleted\n",
- node->debug_id);
- } else {
- BUG_ON(!list_empty(&node->work.entry));
- spin_lock(&binder_dead_nodes_lock);
- /*
- * tmp_refs could have changed so
- * check it again
- */
- if (node->tmp_refs) {
- spin_unlock(&binder_dead_nodes_lock);
- return false;
- }
- hlist_del(&node->dead_node);
- spin_unlock(&binder_dead_nodes_lock);
- binder_debug(BINDER_DEBUG_INTERNAL_REFS,
- "dead node %d deleted\n",
- node->debug_id);
- }
- return true;
- }
- }
- return false;
-}
-
-static void binder_dec_node(struct binder_node *node, int strong, int internal)
-{
- bool free_node;
-
- binder_node_inner_lock(node);
- free_node = binder_dec_node_nilocked(node, strong, internal);
- binder_node_inner_unlock(node);
- if (free_node)
- binder_free_node(node);
-}
-
-static void binder_inc_node_tmpref_ilocked(struct binder_node *node)
-{
- /*
- * No call to binder_inc_node() is needed since we
- * don't need to inform userspace of any changes to
- * tmp_refs
- */
- node->tmp_refs++;
-}
-
-/**
- * binder_inc_node_tmpref() - take a temporary reference on node
- * @node: node to reference
- *
- * Take reference on node to prevent the node from being freed
- * while referenced only by a local variable. The inner lock is
- * needed to serialize with the node work on the queue (which
- * isn't needed after the node is dead). If the node is dead
- * (node->proc is NULL), use binder_dead_nodes_lock to protect
- * node->tmp_refs against dead-node-only cases where the node
- * lock cannot be acquired (eg traversing the dead node list to
- * print nodes)
- */
-static void binder_inc_node_tmpref(struct binder_node *node)
-{
- binder_node_lock(node);
- if (node->proc)
- binder_inner_proc_lock(node->proc);
- else
- spin_lock(&binder_dead_nodes_lock);
- binder_inc_node_tmpref_ilocked(node);
- if (node->proc)
- binder_inner_proc_unlock(node->proc);
- else
- spin_unlock(&binder_dead_nodes_lock);
- binder_node_unlock(node);
-}
-
-/**
- * binder_dec_node_tmpref() - remove a temporary reference on node
- * @node: node to reference
- *
- * Release temporary reference on node taken via binder_inc_node_tmpref()
- */
-static void binder_dec_node_tmpref(struct binder_node *node)
-{
- bool free_node;
-
- binder_node_inner_lock(node);
- if (!node->proc)
- spin_lock(&binder_dead_nodes_lock);
- else
- __acquire(&binder_dead_nodes_lock);
- node->tmp_refs--;
- BUG_ON(node->tmp_refs < 0);
- if (!node->proc)
- spin_unlock(&binder_dead_nodes_lock);
- else
- __release(&binder_dead_nodes_lock);
- /*
- * Call binder_dec_node() to check if all refcounts are 0
- * and cleanup is needed. Calling with strong=0 and internal=1
- * causes no actual reference to be released in binder_dec_node().
- * If that changes, a change is needed here too.
- */
- free_node = binder_dec_node_nilocked(node, 0, 1);
- binder_node_inner_unlock(node);
- if (free_node)
- binder_free_node(node);
-}
-
-static void binder_put_node(struct binder_node *node)
-{
- binder_dec_node_tmpref(node);
-}
-
-static struct binder_ref *binder_get_ref_olocked(struct binder_proc *proc,
- u32 desc, bool need_strong_ref)
-{
- struct rb_node *n = proc->refs_by_desc.rb_node;
- struct binder_ref *ref;
-
- while (n) {
- ref = rb_entry(n, struct binder_ref, rb_node_desc);
-
- if (desc < ref->data.desc) {
- n = n->rb_left;
- } else if (desc > ref->data.desc) {
- n = n->rb_right;
- } else if (need_strong_ref && !ref->data.strong) {
- binder_user_error("tried to use weak ref as strong ref\n");
- return NULL;
- } else {
- return ref;
- }
- }
- return NULL;
-}
-
-/**
- * binder_get_ref_for_node_olocked() - get the ref associated with given node
- * @proc: binder_proc that owns the ref
- * @node: binder_node of target
- * @new_ref: newly allocated binder_ref to be initialized or %NULL
- *
- * Look up the ref for the given node and return it if it exists
- *
- * If it doesn't exist and the caller provides a newly allocated
- * ref, initialize the fields of the newly allocated ref and insert
- * into the given proc rb_trees and node refs list.
- *
- * Return: the ref for node. It is possible that another thread
- * allocated/initialized the ref first in which case the
- * returned ref would be different than the passed-in
- * new_ref. new_ref must be kfree'd by the caller in
- * this case.
- */
-static struct binder_ref *binder_get_ref_for_node_olocked(
- struct binder_proc *proc,
- struct binder_node *node,
- struct binder_ref *new_ref)
-{
- struct binder_context *context = proc->context;
- struct rb_node **p = &proc->refs_by_node.rb_node;
- struct rb_node *parent = NULL;
- struct binder_ref *ref;
- struct rb_node *n;
-
- while (*p) {
- parent = *p;
- ref = rb_entry(parent, struct binder_ref, rb_node_node);
-
- if (node < ref->node)
- p = &(*p)->rb_left;
- else if (node > ref->node)
- p = &(*p)->rb_right;
- else
- return ref;
- }
- if (!new_ref)
- return NULL;
-
- binder_stats_created(BINDER_STAT_REF);
- new_ref->data.debug_id = atomic_inc_return(&binder_last_id);
- new_ref->proc = proc;
- new_ref->node = node;
- rb_link_node(&new_ref->rb_node_node, parent, p);
- rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
-
- new_ref->data.desc = (node == context->binder_context_mgr_node) ? 0 : 1;
- for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
- ref = rb_entry(n, struct binder_ref, rb_node_desc);
- if (ref->data.desc > new_ref->data.desc)
- break;
- new_ref->data.desc = ref->data.desc + 1;
- }
-
- p = &proc->refs_by_desc.rb_node;
- while (*p) {
- parent = *p;
- ref = rb_entry(parent, struct binder_ref, rb_node_desc);
-
- if (new_ref->data.desc < ref->data.desc)
- p = &(*p)->rb_left;
- else if (new_ref->data.desc > ref->data.desc)
- p = &(*p)->rb_right;
- else
- BUG();
- }
- rb_link_node(&new_ref->rb_node_desc, parent, p);
- rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
-
- binder_node_lock(node);
- hlist_add_head(&new_ref->node_entry, &node->refs);
-
- binder_debug(BINDER_DEBUG_INTERNAL_REFS,
- "%d new ref %d desc %d for node %d\n",
- proc->pid, new_ref->data.debug_id, new_ref->data.desc,
- node->debug_id);
- binder_node_unlock(node);
- return new_ref;
-}
-
-static void binder_cleanup_ref_olocked(struct binder_ref *ref)
-{
- bool delete_node = false;
-
- binder_debug(BINDER_DEBUG_INTERNAL_REFS,
- "%d delete ref %d desc %d for node %d\n",
- ref->proc->pid, ref->data.debug_id, ref->data.desc,
- ref->node->debug_id);
-
- rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
- rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
-
- binder_node_inner_lock(ref->node);
- if (ref->data.strong)
- binder_dec_node_nilocked(ref->node, 1, 1);
-
- hlist_del(&ref->node_entry);
- delete_node = binder_dec_node_nilocked(ref->node, 0, 1);
- binder_node_inner_unlock(ref->node);
- /*
- * Clear ref->node unless we want the caller to free the node
- */
- if (!delete_node) {
- /*
- * The caller uses ref->node to determine
- * whether the node needs to be freed. Clear
- * it since the node is still alive.
- */
- ref->node = NULL;
- }
-
- if (ref->death) {
- binder_debug(BINDER_DEBUG_DEAD_BINDER,
- "%d delete ref %d desc %d has death notification\n",
- ref->proc->pid, ref->data.debug_id,
- ref->data.desc);
- binder_dequeue_work(ref->proc, &ref->death->work);
- binder_stats_deleted(BINDER_STAT_DEATH);
- }
- binder_stats_deleted(BINDER_STAT_REF);
-}
-
-/**
- * binder_inc_ref_olocked() - increment the ref for given handle
- * @ref: ref to be incremented
- * @strong: if true, strong increment, else weak
- * @target_list: list to queue node work on
- *
- * Increment the ref. @ref->proc->outer_lock must be held on entry
- *
- * Return: 0, if successful, else errno
- */
-static int binder_inc_ref_olocked(struct binder_ref *ref, int strong,
- struct list_head *target_list)
-{
- int ret;
-
- if (strong) {
- if (ref->data.strong == 0) {
- ret = binder_inc_node(ref->node, 1, 1, target_list);
- if (ret)
- return ret;
- }
- ref->data.strong++;
- } else {
- if (ref->data.weak == 0) {
- ret = binder_inc_node(ref->node, 0, 1, target_list);
- if (ret)
- return ret;
- }
- ref->data.weak++;
- }
- return 0;
-}
-
-/**
- * binder_dec_ref_olocked() - dec the ref for given handle
- * @ref: ref to be decremented
- * @strong: if true, strong decrement, else weak
- *
- * Decrement the ref.
- *
- * Return: %true if ref is cleaned up and ready to be freed.
- */
-static bool binder_dec_ref_olocked(struct binder_ref *ref, int strong)
-{
- if (strong) {
- if (ref->data.strong == 0) {
- binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
- ref->proc->pid, ref->data.debug_id,
- ref->data.desc, ref->data.strong,
- ref->data.weak);
- return false;
- }
- ref->data.strong--;
- if (ref->data.strong == 0)
- binder_dec_node(ref->node, strong, 1);
- } else {
- if (ref->data.weak == 0) {
- binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
- ref->proc->pid, ref->data.debug_id,
- ref->data.desc, ref->data.strong,
- ref->data.weak);
- return false;
- }
- ref->data.weak--;
- }
- if (ref->data.strong == 0 && ref->data.weak == 0) {
- binder_cleanup_ref_olocked(ref);
- return true;
- }
- return false;
-}
-
-/**
- * binder_get_node_from_ref() - get the node from the given proc/desc
- * @proc: proc containing the ref
- * @desc: the handle associated with the ref
- * @need_strong_ref: if true, only return node if ref is strong
- * @rdata: the id/refcount data for the ref
- *
- * Given a proc and ref handle, return the associated binder_node
- *
- * Return: a binder_node or NULL if not found or not strong when strong required
- */
-static struct binder_node *binder_get_node_from_ref(
- struct binder_proc *proc,
- u32 desc, bool need_strong_ref,
- struct binder_ref_data *rdata)
-{
- struct binder_node *node;
- struct binder_ref *ref;
-
- binder_proc_lock(proc);
- ref = binder_get_ref_olocked(proc, desc, need_strong_ref);
- if (!ref)
- goto err_no_ref;
- node = ref->node;
- /*
- * Take an implicit reference on the node to ensure
- * it stays alive until the call to binder_put_node()
- */
- binder_inc_node_tmpref(node);
- if (rdata)
- *rdata = ref->data;
- binder_proc_unlock(proc);
-
- return node;
-
-err_no_ref:
- binder_proc_unlock(proc);
- return NULL;
-}
-
-/**
- * binder_free_ref() - free the binder_ref
- * @ref: ref to free
- *
- * Free the binder_ref. Free the binder_node indicated by ref->node
- * (if non-NULL) and the binder_ref_death indicated by ref->death.
- */
-static void binder_free_ref(struct binder_ref *ref)
-{
- if (ref->node)
- binder_free_node(ref->node);
- kfree(ref->death);
- kfree(ref);
-}
-
-/**
- * binder_update_ref_for_handle() - inc/dec the ref for given handle
- * @proc: proc containing the ref
- * @desc: the handle associated with the ref
- * @increment: true=inc reference, false=dec reference
- * @strong: true=strong reference, false=weak reference
- * @rdata: the id/refcount data for the ref
- *
- * Given a proc and ref handle, increment or decrement the ref
- * according to "increment" arg.
- *
- * Return: 0 if successful, else errno
- */
-static int binder_update_ref_for_handle(struct binder_proc *proc,
- uint32_t desc, bool increment, bool strong,
- struct binder_ref_data *rdata)
-{
- int ret = 0;
- struct binder_ref *ref;
- bool delete_ref = false;
-
- binder_proc_lock(proc);
- ref = binder_get_ref_olocked(proc, desc, strong);
- if (!ref) {
- ret = -EINVAL;
- goto err_no_ref;
- }
- if (increment)
- ret = binder_inc_ref_olocked(ref, strong, NULL);
- else
- delete_ref = binder_dec_ref_olocked(ref, strong);
-
- if (rdata)
- *rdata = ref->data;
- binder_proc_unlock(proc);
-
- if (delete_ref)
- binder_free_ref(ref);
- return ret;
-
-err_no_ref:
- binder_proc_unlock(proc);
- return ret;
-}
-
-/**
- * binder_dec_ref_for_handle() - dec the ref for given handle
- * @proc: proc containing the ref
- * @desc: the handle associated with the ref
- * @strong: true=strong reference, false=weak reference
- * @rdata: the id/refcount data for the ref
- *
- * Just calls binder_update_ref_for_handle() to decrement the ref.
- *
- * Return: 0 if successful, else errno
- */
-static int binder_dec_ref_for_handle(struct binder_proc *proc,
- uint32_t desc, bool strong, struct binder_ref_data *rdata)
-{
- return binder_update_ref_for_handle(proc, desc, false, strong, rdata);
-}
-
-
-/**
- * binder_inc_ref_for_node() - increment the ref for given proc/node
- * @proc: proc containing the ref
- * @node: target node
- * @strong: true=strong reference, false=weak reference
- * @target_list: worklist to use if node is incremented
- * @rdata: the id/refcount data for the ref
- *
- * Given a proc and node, increment the ref. Create the ref if it
- * doesn't already exist
- *
- * Return: 0 if successful, else errno
- */
-static int binder_inc_ref_for_node(struct binder_proc *proc,
- struct binder_node *node,
- bool strong,
- struct list_head *target_list,
- struct binder_ref_data *rdata)
-{
- struct binder_ref *ref;
- struct binder_ref *new_ref = NULL;
- int ret = 0;
-
- binder_proc_lock(proc);
- ref = binder_get_ref_for_node_olocked(proc, node, NULL);
- if (!ref) {
- binder_proc_unlock(proc);
- new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
- if (!new_ref)
- return -ENOMEM;
- binder_proc_lock(proc);
- ref = binder_get_ref_for_node_olocked(proc, node, new_ref);
- }
- ret = binder_inc_ref_olocked(ref, strong, target_list);
- *rdata = ref->data;
- if (ret && ref == new_ref) {
- /*
- * Cleanup the failed reference here as the target
- * could now be dead and have already released its
- * references by now. Calling on the new reference
- * with strong=0 and a tmp_refs will not decrement
- * the node. The new_ref gets kfree'd below.
- */
- binder_cleanup_ref_olocked(new_ref);
- ref = NULL;
- }
-
- binder_proc_unlock(proc);
- if (new_ref && ref != new_ref)
- /*
- * Another thread created the ref first so
- * free the one we allocated
- */
- kfree(new_ref);
- return ret;
-}
-
-static void binder_pop_transaction_ilocked(struct binder_thread *target_thread,
- struct binder_transaction *t)
-{
- BUG_ON(!target_thread);
- assert_spin_locked(&target_thread->proc->inner_lock);
- BUG_ON(target_thread->transaction_stack != t);
- BUG_ON(target_thread->transaction_stack->from != target_thread);
- target_thread->transaction_stack =
- target_thread->transaction_stack->from_parent;
- t->from = NULL;
-}
-
-/**
- * binder_thread_dec_tmpref() - decrement thread->tmp_ref
- * @thread: thread to decrement
- *
- * A thread needs to be kept alive while being used to create or
- * handle a transaction. binder_get_txn_from() is used to safely
- * extract t->from from a binder_transaction and keep the thread
- * indicated by t->from from being freed. When done with that
- * binder_thread, this function is called to decrement the
- * tmp_ref and free if appropriate (thread has been released
- * and no transaction being processed by the driver)
- */
-static void binder_thread_dec_tmpref(struct binder_thread *thread)
-{
- /*
- * atomic is used to protect the counter value while
- * it cannot reach zero or thread->is_dead is false
- */
- binder_inner_proc_lock(thread->proc);
- atomic_dec(&thread->tmp_ref);
- if (thread->is_dead && !atomic_read(&thread->tmp_ref)) {
- binder_inner_proc_unlock(thread->proc);
- binder_free_thread(thread);
- return;
- }
- binder_inner_proc_unlock(thread->proc);
-}
-
-/**
- * binder_proc_dec_tmpref() - decrement proc->tmp_ref
- * @proc: proc to decrement
- *
- * A binder_proc needs to be kept alive while being used to create or
- * handle a transaction. proc->tmp_ref is incremented when
- * creating a new transaction or the binder_proc is currently in-use
- * by threads that are being released. When done with the binder_proc,
- * this function is called to decrement the counter and free the
- * proc if appropriate (proc has been released, all threads have
- * been released and not currenly in-use to process a transaction).
- */
-static void binder_proc_dec_tmpref(struct binder_proc *proc)
-{
- binder_inner_proc_lock(proc);
- proc->tmp_ref--;
- if (proc->is_dead && RB_EMPTY_ROOT(&proc->threads) &&
- !proc->tmp_ref) {
- binder_inner_proc_unlock(proc);
- binder_free_proc(proc);
- return;
- }
- binder_inner_proc_unlock(proc);
-}
-
-/**
- * binder_get_txn_from() - safely extract the "from" thread in transaction
- * @t: binder transaction for t->from
- *
- * Atomically return the "from" thread and increment the tmp_ref
- * count for the thread to ensure it stays alive until
- * binder_thread_dec_tmpref() is called.
- *
- * Return: the value of t->from
- */
-static struct binder_thread *binder_get_txn_from(
- struct binder_transaction *t)
-{
- struct binder_thread *from;
-
- spin_lock(&t->lock);
- from = t->from;
- if (from)
- atomic_inc(&from->tmp_ref);
- spin_unlock(&t->lock);
- return from;
-}
-
-/**
- * binder_get_txn_from_and_acq_inner() - get t->from and acquire inner lock
- * @t: binder transaction for t->from
- *
- * Same as binder_get_txn_from() except it also acquires the proc->inner_lock
- * to guarantee that the thread cannot be released while operating on it.
- * The caller must call binder_inner_proc_unlock() to release the inner lock
- * as well as call binder_dec_thread_txn() to release the reference.
- *
- * Return: the value of t->from
- */
-static struct binder_thread *binder_get_txn_from_and_acq_inner(
- struct binder_transaction *t)
- __acquires(&t->from->proc->inner_lock)
-{
- struct binder_thread *from;
-
- from = binder_get_txn_from(t);
- if (!from) {
- __acquire(&from->proc->inner_lock);
- return NULL;
- }
- binder_inner_proc_lock(from->proc);
- if (t->from) {
- BUG_ON(from != t->from);
- return from;
- }
- binder_inner_proc_unlock(from->proc);
- __acquire(&from->proc->inner_lock);
- binder_thread_dec_tmpref(from);
- return NULL;
-}
-
-/**
- * binder_free_txn_fixups() - free unprocessed fd fixups
- * @t: binder transaction for t->from
- *
- * If the transaction is being torn down prior to being
- * processed by the target process, free all of the
- * fd fixups and fput the file structs. It is safe to
- * call this function after the fixups have been
- * processed -- in that case, the list will be empty.
- */
-static void binder_free_txn_fixups(struct binder_transaction *t)
-{
- struct binder_txn_fd_fixup *fixup, *tmp;
-
- list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) {
- fput(fixup->file);
- if (fixup->target_fd >= 0)
- put_unused_fd(fixup->target_fd);
- list_del(&fixup->fixup_entry);
- kfree(fixup);
- }
-}
-
-static void binder_txn_latency_free(struct binder_transaction *t)
-{
- int from_proc, from_thread, to_proc, to_thread;
-
- spin_lock(&t->lock);
- from_proc = t->from ? t->from->proc->pid : 0;
- from_thread = t->from ? t->from->pid : 0;
- to_proc = t->to_proc ? t->to_proc->pid : 0;
- to_thread = t->to_thread ? t->to_thread->pid : 0;
- spin_unlock(&t->lock);
-
- trace_binder_txn_latency_free(t, from_proc, from_thread, to_proc, to_thread);
-}
-
-static void binder_free_transaction(struct binder_transaction *t)
-{
- struct binder_proc *target_proc = t->to_proc;
-
- if (target_proc) {
- binder_inner_proc_lock(target_proc);
- target_proc->outstanding_txns--;
- if (target_proc->outstanding_txns < 0)
- pr_warn("%s: Unexpected outstanding_txns %d\n",
- __func__, target_proc->outstanding_txns);
- if (!target_proc->outstanding_txns && target_proc->is_frozen)
- wake_up_interruptible_all(&target_proc->freeze_wait);
- if (t->buffer)
- t->buffer->transaction = NULL;
- binder_inner_proc_unlock(target_proc);
- }
- if (trace_binder_txn_latency_free_enabled())
- binder_txn_latency_free(t);
- /*
- * If the transaction has no target_proc, then
- * t->buffer->transaction has already been cleared.
- */
- binder_free_txn_fixups(t);
- kfree(t);
- binder_stats_deleted(BINDER_STAT_TRANSACTION);
-}
-
-static void binder_send_failed_reply(struct binder_transaction *t,
- uint32_t error_code)
-{
- struct binder_thread *target_thread;
- struct binder_transaction *next;
-
- BUG_ON(t->flags & TF_ONE_WAY);
- while (1) {
- target_thread = binder_get_txn_from_and_acq_inner(t);
- if (target_thread) {
- binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
- "send failed reply for transaction %d to %d:%d\n",
- t->debug_id,
- target_thread->proc->pid,
- target_thread->pid);
-
- binder_pop_transaction_ilocked(target_thread, t);
- if (target_thread->reply_error.cmd == BR_OK) {
- target_thread->reply_error.cmd = error_code;
- binder_enqueue_thread_work_ilocked(
- target_thread,
- &target_thread->reply_error.work);
- wake_up_interruptible(&target_thread->wait);
- } else {
- /*
- * Cannot get here for normal operation, but
- * we can if multiple synchronous transactions
- * are sent without blocking for responses.
- * Just ignore the 2nd error in this case.
- */
- pr_warn("Unexpected reply error: %u\n",
- target_thread->reply_error.cmd);
- }
- binder_inner_proc_unlock(target_thread->proc);
- binder_thread_dec_tmpref(target_thread);
- binder_free_transaction(t);
- return;
- }
- __release(&target_thread->proc->inner_lock);
- next = t->from_parent;
-
- binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
- "send failed reply for transaction %d, target dead\n",
- t->debug_id);
-
- binder_free_transaction(t);
- if (next == NULL) {
- binder_debug(BINDER_DEBUG_DEAD_BINDER,
- "reply failed, no target thread at root\n");
- return;
- }
- t = next;
- binder_debug(BINDER_DEBUG_DEAD_BINDER,
- "reply failed, no target thread -- retry %d\n",
- t->debug_id);
- }
-}
-
-/**
- * binder_cleanup_transaction() - cleans up undelivered transaction
- * @t: transaction that needs to be cleaned up
- * @reason: reason the transaction wasn't delivered
- * @error_code: error to return to caller (if synchronous call)
- */
-static void binder_cleanup_transaction(struct binder_transaction *t,
- const char *reason,
- uint32_t error_code)
-{
- if (t->buffer->target_node && !(t->flags & TF_ONE_WAY)) {
- binder_send_failed_reply(t, error_code);
- } else {
- binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
- "undelivered transaction %d, %s\n",
- t->debug_id, reason);
- binder_free_transaction(t);
- }
-}
-
-/**
- * binder_get_object() - gets object and checks for valid metadata
- * @proc: binder_proc owning the buffer
- * @u: sender's user pointer to base of buffer
- * @buffer: binder_buffer that we're parsing.
- * @offset: offset in the @buffer at which to validate an object.
- * @object: struct binder_object to read into
- *
- * Copy the binder object at the given offset into @object. If @u is
- * provided then the copy is from the sender's buffer. If not, then
- * it is copied from the target's @buffer.
- *
- * Return: If there's a valid metadata object at @offset, the
- * size of that object. Otherwise, it returns zero. The object
- * is read into the struct binder_object pointed to by @object.
- */
-static size_t binder_get_object(struct binder_proc *proc,
- const void __user *u,
- struct binder_buffer *buffer,
- unsigned long offset,
- struct binder_object *object)
-{
- size_t read_size;
- struct binder_object_header *hdr;
- size_t object_size = 0;
-
- read_size = min_t(size_t, sizeof(*object), buffer->data_size - offset);
- if (offset > buffer->data_size || read_size < sizeof(*hdr))
- return 0;
- if (u) {
- if (copy_from_user(object, u + offset, read_size))
- return 0;
- } else {
- if (binder_alloc_copy_from_buffer(&proc->alloc, object, buffer,
- offset, read_size))
- return 0;
- }
-
- /* Ok, now see if we read a complete object. */
- hdr = &object->hdr;
- switch (hdr->type) {
- case BINDER_TYPE_BINDER:
- case BINDER_TYPE_WEAK_BINDER:
- case BINDER_TYPE_HANDLE:
- case BINDER_TYPE_WEAK_HANDLE:
- object_size = sizeof(struct flat_binder_object);
- break;
- case BINDER_TYPE_FD:
- object_size = sizeof(struct binder_fd_object);
- break;
- case BINDER_TYPE_PTR:
- object_size = sizeof(struct binder_buffer_object);
- break;
- case BINDER_TYPE_FDA:
- object_size = sizeof(struct binder_fd_array_object);
- break;
- default:
- return 0;
- }
- if (offset <= buffer->data_size - object_size &&
- buffer->data_size >= object_size)
- return object_size;
- else
- return 0;
-}
-
-/**
- * binder_validate_ptr() - validates binder_buffer_object in a binder_buffer.
- * @proc: binder_proc owning the buffer
- * @b: binder_buffer containing the object
- * @object: struct binder_object to read into
- * @index: index in offset array at which the binder_buffer_object is
- * located
- * @start_offset: points to the start of the offset array
- * @object_offsetp: offset of @object read from @b
- * @num_valid: the number of valid offsets in the offset array
- *
- * Return: If @index is within the valid range of the offset array
- * described by @start and @num_valid, and if there's a valid
- * binder_buffer_object at the offset found in index @index
- * of the offset array, that object is returned. Otherwise,
- * %NULL is returned.
- * Note that the offset found in index @index itself is not
- * verified; this function assumes that @num_valid elements
- * from @start were previously verified to have valid offsets.
- * If @object_offsetp is non-NULL, then the offset within
- * @b is written to it.
- */
-static struct binder_buffer_object *binder_validate_ptr(
- struct binder_proc *proc,
- struct binder_buffer *b,
- struct binder_object *object,
- binder_size_t index,
- binder_size_t start_offset,
- binder_size_t *object_offsetp,
- binder_size_t num_valid)
-{
- size_t object_size;
- binder_size_t object_offset;
- unsigned long buffer_offset;
-
- if (index >= num_valid)
- return NULL;
-
- buffer_offset = start_offset + sizeof(binder_size_t) * index;
- if (binder_alloc_copy_from_buffer(&proc->alloc, &object_offset,
- b, buffer_offset,
- sizeof(object_offset)))
- return NULL;
- object_size = binder_get_object(proc, NULL, b, object_offset, object);
- if (!object_size || object->hdr.type != BINDER_TYPE_PTR)
- return NULL;
- if (object_offsetp)
- *object_offsetp = object_offset;
-
- return &object->bbo;
-}
-
-/**
- * binder_validate_fixup() - validates pointer/fd fixups happen in order.
- * @proc: binder_proc owning the buffer
- * @b: transaction buffer
- * @objects_start_offset: offset to start of objects buffer
- * @buffer_obj_offset: offset to binder_buffer_object in which to fix up
- * @fixup_offset: start offset in @buffer to fix up
- * @last_obj_offset: offset to last binder_buffer_object that we fixed
- * @last_min_offset: minimum fixup offset in object at @last_obj_offset
- *
- * Return: %true if a fixup in buffer @buffer at offset @offset is
- * allowed.
- *
- * For safety reasons, we only allow fixups inside a buffer to happen
- * at increasing offsets; additionally, we only allow fixup on the last
- * buffer object that was verified, or one of its parents.
- *
- * Example of what is allowed:
- *
- * A
- * B (parent = A, offset = 0)
- * C (parent = A, offset = 16)
- * D (parent = C, offset = 0)
- * E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset)
- *
- * Examples of what is not allowed:
- *
- * Decreasing offsets within the same parent:
- * A
- * C (parent = A, offset = 16)
- * B (parent = A, offset = 0) // decreasing offset within A
- *
- * Referring to a parent that wasn't the last object or any of its parents:
- * A
- * B (parent = A, offset = 0)
- * C (parent = A, offset = 0)
- * C (parent = A, offset = 16)
- * D (parent = B, offset = 0) // B is not A or any of A's parents
- */
-static bool binder_validate_fixup(struct binder_proc *proc,
- struct binder_buffer *b,
- binder_size_t objects_start_offset,
- binder_size_t buffer_obj_offset,
- binder_size_t fixup_offset,
- binder_size_t last_obj_offset,
- binder_size_t last_min_offset)
-{
- if (!last_obj_offset) {
- /* Nothing to fix up in */
- return false;
- }
-
- while (last_obj_offset != buffer_obj_offset) {
- unsigned long buffer_offset;
- struct binder_object last_object;
- struct binder_buffer_object *last_bbo;
- size_t object_size = binder_get_object(proc, NULL, b,
- last_obj_offset,
- &last_object);
- if (object_size != sizeof(*last_bbo))
- return false;
-
- last_bbo = &last_object.bbo;
- /*
- * Safe to retrieve the parent of last_obj, since it
- * was already previously verified by the driver.
- */
- if ((last_bbo->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0)
- return false;
- last_min_offset = last_bbo->parent_offset + sizeof(uintptr_t);
- buffer_offset = objects_start_offset +
- sizeof(binder_size_t) * last_bbo->parent;
- if (binder_alloc_copy_from_buffer(&proc->alloc,
- &last_obj_offset,
- b, buffer_offset,
- sizeof(last_obj_offset)))
- return false;
- }
- return (fixup_offset >= last_min_offset);
-}
-
-/**
- * struct binder_task_work_cb - for deferred close
- *
- * @twork: callback_head for task work
- * @fd: fd to close
- *
- * Structure to pass task work to be handled after
- * returning from binder_ioctl() via task_work_add().
- */
-struct binder_task_work_cb {
- struct callback_head twork;
- struct file *file;
-};
-
-/**
- * binder_do_fd_close() - close list of file descriptors
- * @twork: callback head for task work
- *
- * It is not safe to call ksys_close() during the binder_ioctl()
- * function if there is a chance that binder's own file descriptor
- * might be closed. This is to meet the requirements for using
- * fdget() (see comments for __fget_light()). Therefore use
- * task_work_add() to schedule the close operation once we have
- * returned from binder_ioctl(). This function is a callback
- * for that mechanism and does the actual ksys_close() on the
- * given file descriptor.
- */
-static void binder_do_fd_close(struct callback_head *twork)
-{
- struct binder_task_work_cb *twcb = container_of(twork,
- struct binder_task_work_cb, twork);
-
- fput(twcb->file);
- kfree(twcb);
-}
-
-/**
- * binder_deferred_fd_close() - schedule a close for the given file-descriptor
- * @fd: file-descriptor to close
- *
- * See comments in binder_do_fd_close(). This function is used to schedule
- * a file-descriptor to be closed after returning from binder_ioctl().
- */
-static void binder_deferred_fd_close(int fd)
-{
- struct binder_task_work_cb *twcb;
-
- twcb = kzalloc(sizeof(*twcb), GFP_KERNEL);
- if (!twcb)
- return;
- init_task_work(&twcb->twork, binder_do_fd_close);
- twcb->file = close_fd_get_file(fd);
- if (twcb->file) {
- // pin it until binder_do_fd_close(); see comments there
- get_file(twcb->file);
- filp_close(twcb->file, current->files);
- task_work_add(current, &twcb->twork, TWA_RESUME);
- } else {
- kfree(twcb);
- }
-}
-
-static void binder_transaction_buffer_release(struct binder_proc *proc,
- struct binder_thread *thread,
- struct binder_buffer *buffer,
- binder_size_t off_end_offset,
- bool is_failure)
-{
- int debug_id = buffer->debug_id;
- binder_size_t off_start_offset, buffer_offset;
-
- binder_debug(BINDER_DEBUG_TRANSACTION,
- "%d buffer release %d, size %zd-%zd, failed at %llx\n",
- proc->pid, buffer->debug_id,
- buffer->data_size, buffer->offsets_size,
- (unsigned long long)off_end_offset);
-
- if (buffer->target_node)
- binder_dec_node(buffer->target_node, 1, 0);
-
- off_start_offset = ALIGN(buffer->data_size, sizeof(void *));
-
- for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
- buffer_offset += sizeof(binder_size_t)) {
- struct binder_object_header *hdr;
- size_t object_size = 0;
- struct binder_object object;
- binder_size_t object_offset;
-
- if (!binder_alloc_copy_from_buffer(&proc->alloc, &object_offset,
- buffer, buffer_offset,
- sizeof(object_offset)))
- object_size = binder_get_object(proc, NULL, buffer,
- object_offset, &object);
- if (object_size == 0) {
- pr_err("transaction release %d bad object at offset %lld, size %zd\n",
- debug_id, (u64)object_offset, buffer->data_size);
- continue;
- }
- hdr = &object.hdr;
- switch (hdr->type) {
- case BINDER_TYPE_BINDER:
- case BINDER_TYPE_WEAK_BINDER: {
- struct flat_binder_object *fp;
- struct binder_node *node;
-
- fp = to_flat_binder_object(hdr);
- node = binder_get_node(proc, fp->binder);
- if (node == NULL) {
- pr_err("transaction release %d bad node %016llx\n",
- debug_id, (u64)fp->binder);
- break;
- }
- binder_debug(BINDER_DEBUG_TRANSACTION,
- " node %d u%016llx\n",
- node->debug_id, (u64)node->ptr);
- binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER,
- 0);
- binder_put_node(node);
- } break;
- case BINDER_TYPE_HANDLE:
- case BINDER_TYPE_WEAK_HANDLE: {
- struct flat_binder_object *fp;
- struct binder_ref_data rdata;
- int ret;
-
- fp = to_flat_binder_object(hdr);
- ret = binder_dec_ref_for_handle(proc, fp->handle,
- hdr->type == BINDER_TYPE_HANDLE, &rdata);
-
- if (ret) {
- pr_err("transaction release %d bad handle %d, ret = %d\n",
- debug_id, fp->handle, ret);
- break;
- }
- binder_debug(BINDER_DEBUG_TRANSACTION,
- " ref %d desc %d\n",
- rdata.debug_id, rdata.desc);
- } break;
-
- case BINDER_TYPE_FD: {
- /*
- * No need to close the file here since user-space
- * closes it for successfully delivered
- * transactions. For transactions that weren't
- * delivered, the new fd was never allocated so
- * there is no need to close and the fput on the
- * file is done when the transaction is torn
- * down.
- */
- } break;
- case BINDER_TYPE_PTR:
- /*
- * Nothing to do here, this will get cleaned up when the
- * transaction buffer gets freed
- */
- break;
- case BINDER_TYPE_FDA: {
- struct binder_fd_array_object *fda;
- struct binder_buffer_object *parent;
- struct binder_object ptr_object;
- binder_size_t fda_offset;
- size_t fd_index;
- binder_size_t fd_buf_size;
- binder_size_t num_valid;
-
- if (is_failure) {
- /*
- * The fd fixups have not been applied so no
- * fds need to be closed.
- */
- continue;
- }
-
- num_valid = (buffer_offset - off_start_offset) /
- sizeof(binder_size_t);
- fda = to_binder_fd_array_object(hdr);
- parent = binder_validate_ptr(proc, buffer, &ptr_object,
- fda->parent,
- off_start_offset,
- NULL,
- num_valid);
- if (!parent) {
- pr_err("transaction release %d bad parent offset\n",
- debug_id);
- continue;
- }
- fd_buf_size = sizeof(u32) * fda->num_fds;
- if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
- pr_err("transaction release %d invalid number of fds (%lld)\n",
- debug_id, (u64)fda->num_fds);
- continue;
- }
- if (fd_buf_size > parent->length ||
- fda->parent_offset > parent->length - fd_buf_size) {
- /* No space for all file descriptors here. */
- pr_err("transaction release %d not enough space for %lld fds in buffer\n",
- debug_id, (u64)fda->num_fds);
- continue;
- }
- /*
- * the source data for binder_buffer_object is visible
- * to user-space and the @buffer element is the user
- * pointer to the buffer_object containing the fd_array.
- * Convert the address to an offset relative to
- * the base of the transaction buffer.
- */
- fda_offset =
- (parent->buffer - (uintptr_t)buffer->user_data) +
- fda->parent_offset;
- for (fd_index = 0; fd_index < fda->num_fds;
- fd_index++) {
- u32 fd;
- int err;
- binder_size_t offset = fda_offset +
- fd_index * sizeof(fd);
-
- err = binder_alloc_copy_from_buffer(
- &proc->alloc, &fd, buffer,
- offset, sizeof(fd));
- WARN_ON(err);
- if (!err) {
- binder_deferred_fd_close(fd);
- /*
- * Need to make sure the thread goes
- * back to userspace to complete the
- * deferred close
- */
- if (thread)
- thread->looper_need_return = true;
- }
- }
- } break;
- default:
- pr_err("transaction release %d bad object type %x\n",
- debug_id, hdr->type);
- break;
- }
- }
-}
-
-/* Clean up all the objects in the buffer */
-static inline void binder_release_entire_buffer(struct binder_proc *proc,
- struct binder_thread *thread,
- struct binder_buffer *buffer,
- bool is_failure)
-{
- binder_size_t off_end_offset;
-
- off_end_offset = ALIGN(buffer->data_size, sizeof(void *));
- off_end_offset += buffer->offsets_size;
-
- binder_transaction_buffer_release(proc, thread, buffer,
- off_end_offset, is_failure);
-}
-
-static int binder_translate_binder(struct flat_binder_object *fp,
- struct binder_transaction *t,
- struct binder_thread *thread)
-{
- struct binder_node *node;
- struct binder_proc *proc = thread->proc;
- struct binder_proc *target_proc = t->to_proc;
- struct binder_ref_data rdata;
- int ret = 0;
-
- node = binder_get_node(proc, fp->binder);
- if (!node) {
- node = binder_new_node(proc, fp);
- if (!node)
- return -ENOMEM;
- }
- if (fp->cookie != node->cookie) {
- binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
- proc->pid, thread->pid, (u64)fp->binder,
- node->debug_id, (u64)fp->cookie,
- (u64)node->cookie);
- ret = -EINVAL;
- goto done;
- }
- if (security_binder_transfer_binder(proc->cred, target_proc->cred)) {
- ret = -EPERM;
- goto done;
- }
-
- ret = binder_inc_ref_for_node(target_proc, node,
- fp->hdr.type == BINDER_TYPE_BINDER,
- &thread->todo, &rdata);
- if (ret)
- goto done;
-
- if (fp->hdr.type == BINDER_TYPE_BINDER)
- fp->hdr.type = BINDER_TYPE_HANDLE;
- else
- fp->hdr.type = BINDER_TYPE_WEAK_HANDLE;
- fp->binder = 0;
- fp->handle = rdata.desc;
- fp->cookie = 0;
-
- trace_binder_transaction_node_to_ref(t, node, &rdata);
- binder_debug(BINDER_DEBUG_TRANSACTION,
- " node %d u%016llx -> ref %d desc %d\n",
- node->debug_id, (u64)node->ptr,
- rdata.debug_id, rdata.desc);
-done:
- binder_put_node(node);
- return ret;
-}
-
-static int binder_translate_handle(struct flat_binder_object *fp,
- struct binder_transaction *t,
- struct binder_thread *thread)
-{
- struct binder_proc *proc = thread->proc;
- struct binder_proc *target_proc = t->to_proc;
- struct binder_node *node;
- struct binder_ref_data src_rdata;
- int ret = 0;
-
- node = binder_get_node_from_ref(proc, fp->handle,
- fp->hdr.type == BINDER_TYPE_HANDLE, &src_rdata);
- if (!node) {
- binder_user_error("%d:%d got transaction with invalid handle, %d\n",
- proc->pid, thread->pid, fp->handle);
- return -EINVAL;
- }
- if (security_binder_transfer_binder(proc->cred, target_proc->cred)) {
- ret = -EPERM;
- goto done;
- }
-
- binder_node_lock(node);
- if (node->proc == target_proc) {
- if (fp->hdr.type == BINDER_TYPE_HANDLE)
- fp->hdr.type = BINDER_TYPE_BINDER;
- else
- fp->hdr.type = BINDER_TYPE_WEAK_BINDER;
- fp->binder = node->ptr;
- fp->cookie = node->cookie;
- if (node->proc)
- binder_inner_proc_lock(node->proc);
- else
- __acquire(&node->proc->inner_lock);
- binder_inc_node_nilocked(node,
- fp->hdr.type == BINDER_TYPE_BINDER,
- 0, NULL);
- if (node->proc)
- binder_inner_proc_unlock(node->proc);
- else
- __release(&node->proc->inner_lock);
- trace_binder_transaction_ref_to_node(t, node, &src_rdata);
- binder_debug(BINDER_DEBUG_TRANSACTION,
- " ref %d desc %d -> node %d u%016llx\n",
- src_rdata.debug_id, src_rdata.desc, node->debug_id,
- (u64)node->ptr);
- binder_node_unlock(node);
- } else {
- struct binder_ref_data dest_rdata;
-
- binder_node_unlock(node);
- ret = binder_inc_ref_for_node(target_proc, node,
- fp->hdr.type == BINDER_TYPE_HANDLE,
- NULL, &dest_rdata);
- if (ret)
- goto done;
-
- fp->binder = 0;
- fp->handle = dest_rdata.desc;
- fp->cookie = 0;
- trace_binder_transaction_ref_to_ref(t, node, &src_rdata,
- &dest_rdata);
- binder_debug(BINDER_DEBUG_TRANSACTION,
- " ref %d desc %d -> ref %d desc %d (node %d)\n",
- src_rdata.debug_id, src_rdata.desc,
- dest_rdata.debug_id, dest_rdata.desc,
- node->debug_id);
- }
-done:
- binder_put_node(node);
- return ret;
-}
-
-static int binder_translate_fd(u32 fd, binder_size_t fd_offset,
- struct binder_transaction *t,
- struct binder_thread *thread,
- struct binder_transaction *in_reply_to)
-{
- struct binder_proc *proc = thread->proc;
- struct binder_proc *target_proc = t->to_proc;
- struct binder_txn_fd_fixup *fixup;
- struct file *file;
- int ret = 0;
- bool target_allows_fd;
-
- if (in_reply_to)
- target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS);
- else
- target_allows_fd = t->buffer->target_node->accept_fds;
- if (!target_allows_fd) {
- binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n",
- proc->pid, thread->pid,
- in_reply_to ? "reply" : "transaction",
- fd);
- ret = -EPERM;
- goto err_fd_not_accepted;
- }
-
- file = fget(fd);
- if (!file) {
- binder_user_error("%d:%d got transaction with invalid fd, %d\n",
- proc->pid, thread->pid, fd);
- ret = -EBADF;
- goto err_fget;
- }
- ret = security_binder_transfer_file(proc->cred, target_proc->cred, file);
- if (ret < 0) {
- ret = -EPERM;
- goto err_security;
- }
-
- /*
- * Add fixup record for this transaction. The allocation
- * of the fd in the target needs to be done from a
- * target thread.
- */
- fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
- if (!fixup) {
- ret = -ENOMEM;
- goto err_alloc;
- }
- fixup->file = file;
- fixup->offset = fd_offset;
- fixup->target_fd = -1;
- trace_binder_transaction_fd_send(t, fd, fixup->offset);
- list_add_tail(&fixup->fixup_entry, &t->fd_fixups);
-
- return ret;
-
-err_alloc:
-err_security:
- fput(file);
-err_fget:
-err_fd_not_accepted:
- return ret;
-}
-
-/**
- * struct binder_ptr_fixup - data to be fixed-up in target buffer
- * @offset offset in target buffer to fixup
- * @skip_size bytes to skip in copy (fixup will be written later)
- * @fixup_data data to write at fixup offset
- * @node list node
- *
- * This is used for the pointer fixup list (pf) which is created and consumed
- * during binder_transaction() and is only accessed locally. No
- * locking is necessary.
- *
- * The list is ordered by @offset.
- */
-struct binder_ptr_fixup {
- binder_size_t offset;
- size_t skip_size;
- binder_uintptr_t fixup_data;
- struct list_head node;
-};
-
-/**
- * struct binder_sg_copy - scatter-gather data to be copied
- * @offset offset in target buffer
- * @sender_uaddr user address in source buffer
- * @length bytes to copy
- * @node list node
- *
- * This is used for the sg copy list (sgc) which is created and consumed
- * during binder_transaction() and is only accessed locally. No
- * locking is necessary.
- *
- * The list is ordered by @offset.
- */
-struct binder_sg_copy {
- binder_size_t offset;
- const void __user *sender_uaddr;
- size_t length;
- struct list_head node;
-};
-
-/**
- * binder_do_deferred_txn_copies() - copy and fixup scatter-gather data
- * @alloc: binder_alloc associated with @buffer
- * @buffer: binder buffer in target process
- * @sgc_head: list_head of scatter-gather copy list
- * @pf_head: list_head of pointer fixup list
- *
- * Processes all elements of @sgc_head, applying fixups from @pf_head
- * and copying the scatter-gather data from the source process' user
- * buffer to the target's buffer. It is expected that the list creation
- * and processing all occurs during binder_transaction() so these lists
- * are only accessed in local context.
- *
- * Return: 0=success, else -errno
- */
-static int binder_do_deferred_txn_copies(struct binder_alloc *alloc,
- struct binder_buffer *buffer,
- struct list_head *sgc_head,
- struct list_head *pf_head)
-{
- int ret = 0;
- struct binder_sg_copy *sgc, *tmpsgc;
- struct binder_ptr_fixup *tmppf;
- struct binder_ptr_fixup *pf =
- list_first_entry_or_null(pf_head, struct binder_ptr_fixup,
- node);
-
- list_for_each_entry_safe(sgc, tmpsgc, sgc_head, node) {
- size_t bytes_copied = 0;
-
- while (bytes_copied < sgc->length) {
- size_t copy_size;
- size_t bytes_left = sgc->length - bytes_copied;
- size_t offset = sgc->offset + bytes_copied;
-
- /*
- * We copy up to the fixup (pointed to by pf)
- */
- copy_size = pf ? min(bytes_left, (size_t)pf->offset - offset)
- : bytes_left;
- if (!ret && copy_size)
- ret = binder_alloc_copy_user_to_buffer(
- alloc, buffer,
- offset,
- sgc->sender_uaddr + bytes_copied,
- copy_size);
- bytes_copied += copy_size;
- if (copy_size != bytes_left) {
- BUG_ON(!pf);
- /* we stopped at a fixup offset */
- if (pf->skip_size) {
- /*
- * we are just skipping. This is for
- * BINDER_TYPE_FDA where the translated
- * fds will be fixed up when we get
- * to target context.
- */
- bytes_copied += pf->skip_size;
- } else {
- /* apply the fixup indicated by pf */
- if (!ret)
- ret = binder_alloc_copy_to_buffer(
- alloc, buffer,
- pf->offset,
- &pf->fixup_data,
- sizeof(pf->fixup_data));
- bytes_copied += sizeof(pf->fixup_data);
- }
- list_del(&pf->node);
- kfree(pf);
- pf = list_first_entry_or_null(pf_head,
- struct binder_ptr_fixup, node);
- }
- }
- list_del(&sgc->node);
- kfree(sgc);
- }
- list_for_each_entry_safe(pf, tmppf, pf_head, node) {
- BUG_ON(pf->skip_size == 0);
- list_del(&pf->node);
- kfree(pf);
- }
- BUG_ON(!list_empty(sgc_head));
-
- return ret > 0 ? -EINVAL : ret;
-}
-
-/**
- * binder_cleanup_deferred_txn_lists() - free specified lists
- * @sgc_head: list_head of scatter-gather copy list
- * @pf_head: list_head of pointer fixup list
- *
- * Called to clean up @sgc_head and @pf_head if there is an
- * error.
- */
-static void binder_cleanup_deferred_txn_lists(struct list_head *sgc_head,
- struct list_head *pf_head)
-{
- struct binder_sg_copy *sgc, *tmpsgc;
- struct binder_ptr_fixup *pf, *tmppf;
-
- list_for_each_entry_safe(sgc, tmpsgc, sgc_head, node) {
- list_del(&sgc->node);
- kfree(sgc);
- }
- list_for_each_entry_safe(pf, tmppf, pf_head, node) {
- list_del(&pf->node);
- kfree(pf);
- }
-}
-
-/**
- * binder_defer_copy() - queue a scatter-gather buffer for copy
- * @sgc_head: list_head of scatter-gather copy list
- * @offset: binder buffer offset in target process
- * @sender_uaddr: user address in source process
- * @length: bytes to copy
- *
- * Specify a scatter-gather block to be copied. The actual copy must
- * be deferred until all the needed fixups are identified and queued.
- * Then the copy and fixups are done together so un-translated values
- * from the source are never visible in the target buffer.
- *
- * We are guaranteed that repeated calls to this function will have
- * monotonically increasing @offset values so the list will naturally
- * be ordered.
- *
- * Return: 0=success, else -errno
- */
-static int binder_defer_copy(struct list_head *sgc_head, binder_size_t offset,
- const void __user *sender_uaddr, size_t length)
-{
- struct binder_sg_copy *bc = kzalloc(sizeof(*bc), GFP_KERNEL);
-
- if (!bc)
- return -ENOMEM;
-
- bc->offset = offset;
- bc->sender_uaddr = sender_uaddr;
- bc->length = length;
- INIT_LIST_HEAD(&bc->node);
-
- /*
- * We are guaranteed that the deferred copies are in-order
- * so just add to the tail.
- */
- list_add_tail(&bc->node, sgc_head);
-
- return 0;
-}
-
-/**
- * binder_add_fixup() - queue a fixup to be applied to sg copy
- * @pf_head: list_head of binder ptr fixup list
- * @offset: binder buffer offset in target process
- * @fixup: bytes to be copied for fixup
- * @skip_size: bytes to skip when copying (fixup will be applied later)
- *
- * Add the specified fixup to a list ordered by @offset. When copying
- * the scatter-gather buffers, the fixup will be copied instead of
- * data from the source buffer. For BINDER_TYPE_FDA fixups, the fixup
- * will be applied later (in target process context), so we just skip
- * the bytes specified by @skip_size. If @skip_size is 0, we copy the
- * value in @fixup.
- *
- * This function is called *mostly* in @offset order, but there are
- * exceptions. Since out-of-order inserts are relatively uncommon,
- * we insert the new element by searching backward from the tail of
- * the list.
- *
- * Return: 0=success, else -errno
- */
-static int binder_add_fixup(struct list_head *pf_head, binder_size_t offset,
- binder_uintptr_t fixup, size_t skip_size)
-{
- struct binder_ptr_fixup *pf = kzalloc(sizeof(*pf), GFP_KERNEL);
- struct binder_ptr_fixup *tmppf;
-
- if (!pf)
- return -ENOMEM;
-
- pf->offset = offset;
- pf->fixup_data = fixup;
- pf->skip_size = skip_size;
- INIT_LIST_HEAD(&pf->node);
-
- /* Fixups are *mostly* added in-order, but there are some
- * exceptions. Look backwards through list for insertion point.
- */
- list_for_each_entry_reverse(tmppf, pf_head, node) {
- if (tmppf->offset < pf->offset) {
- list_add(&pf->node, &tmppf->node);
- return 0;
- }
- }
- /*
- * if we get here, then the new offset is the lowest so
- * insert at the head
- */
- list_add(&pf->node, pf_head);
- return 0;
-}
-
-static int binder_translate_fd_array(struct list_head *pf_head,
- struct binder_fd_array_object *fda,
- const void __user *sender_ubuffer,
- struct binder_buffer_object *parent,
- struct binder_buffer_object *sender_uparent,
- struct binder_transaction *t,
- struct binder_thread *thread,
- struct binder_transaction *in_reply_to)
-{
- binder_size_t fdi, fd_buf_size;
- binder_size_t fda_offset;
- const void __user *sender_ufda_base;
- struct binder_proc *proc = thread->proc;
- int ret;
-
- if (fda->num_fds == 0)
- return 0;
-
- fd_buf_size = sizeof(u32) * fda->num_fds;
- if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
- binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n",
- proc->pid, thread->pid, (u64)fda->num_fds);
- return -EINVAL;
- }
- if (fd_buf_size > parent->length ||
- fda->parent_offset > parent->length - fd_buf_size) {
- /* No space for all file descriptors here. */
- binder_user_error("%d:%d not enough space to store %lld fds in buffer\n",
- proc->pid, thread->pid, (u64)fda->num_fds);
- return -EINVAL;
- }
- /*
- * the source data for binder_buffer_object is visible
- * to user-space and the @buffer element is the user
- * pointer to the buffer_object containing the fd_array.
- * Convert the address to an offset relative to
- * the base of the transaction buffer.
- */
- fda_offset = (parent->buffer - (uintptr_t)t->buffer->user_data) +
- fda->parent_offset;
- sender_ufda_base = (void __user *)(uintptr_t)sender_uparent->buffer +
- fda->parent_offset;
-
- if (!IS_ALIGNED((unsigned long)fda_offset, sizeof(u32)) ||
- !IS_ALIGNED((unsigned long)sender_ufda_base, sizeof(u32))) {
- binder_user_error("%d:%d parent offset not aligned correctly.\n",
- proc->pid, thread->pid);
- return -EINVAL;
- }
- ret = binder_add_fixup(pf_head, fda_offset, 0, fda->num_fds * sizeof(u32));
- if (ret)
- return ret;
-
- for (fdi = 0; fdi < fda->num_fds; fdi++) {
- u32 fd;
- binder_size_t offset = fda_offset + fdi * sizeof(fd);
- binder_size_t sender_uoffset = fdi * sizeof(fd);
-
- ret = copy_from_user(&fd, sender_ufda_base + sender_uoffset, sizeof(fd));
- if (!ret)
- ret = binder_translate_fd(fd, offset, t, thread,
- in_reply_to);
- if (ret)
- return ret > 0 ? -EINVAL : ret;
- }
- return 0;
-}
-
-static int binder_fixup_parent(struct list_head *pf_head,
- struct binder_transaction *t,
- struct binder_thread *thread,
- struct binder_buffer_object *bp,
- binder_size_t off_start_offset,
- binder_size_t num_valid,
- binder_size_t last_fixup_obj_off,
- binder_size_t last_fixup_min_off)
-{
- struct binder_buffer_object *parent;
- struct binder_buffer *b = t->buffer;
- struct binder_proc *proc = thread->proc;
- struct binder_proc *target_proc = t->to_proc;
- struct binder_object object;
- binder_size_t buffer_offset;
- binder_size_t parent_offset;
-
- if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT))
- return 0;
-
- parent = binder_validate_ptr(target_proc, b, &object, bp->parent,
- off_start_offset, &parent_offset,
- num_valid);
- if (!parent) {
- binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
- proc->pid, thread->pid);
- return -EINVAL;
- }
-
- if (!binder_validate_fixup(target_proc, b, off_start_offset,
- parent_offset, bp->parent_offset,
- last_fixup_obj_off,
- last_fixup_min_off)) {
- binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
- proc->pid, thread->pid);
- return -EINVAL;
- }
-
- if (parent->length < sizeof(binder_uintptr_t) ||
- bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) {
- /* No space for a pointer here! */
- binder_user_error("%d:%d got transaction with invalid parent offset\n",
- proc->pid, thread->pid);
- return -EINVAL;
- }
- buffer_offset = bp->parent_offset +
- (uintptr_t)parent->buffer - (uintptr_t)b->user_data;
- return binder_add_fixup(pf_head, buffer_offset, bp->buffer, 0);
-}
-
-/**
- * binder_can_update_transaction() - Can a txn be superseded by an updated one?
- * @t1: the pending async txn in the frozen process
- * @t2: the new async txn to supersede the outdated pending one
- *
- * Return: true if t2 can supersede t1
- * false if t2 can not supersede t1
- */
-static bool binder_can_update_transaction(struct binder_transaction *t1,
- struct binder_transaction *t2)
-{
- if ((t1->flags & t2->flags & (TF_ONE_WAY | TF_UPDATE_TXN)) !=
- (TF_ONE_WAY | TF_UPDATE_TXN) || !t1->to_proc || !t2->to_proc)
- return false;
- if (t1->to_proc->tsk == t2->to_proc->tsk && t1->code == t2->code &&
- t1->flags == t2->flags && t1->buffer->pid == t2->buffer->pid &&
- t1->buffer->target_node->ptr == t2->buffer->target_node->ptr &&
- t1->buffer->target_node->cookie == t2->buffer->target_node->cookie)
- return true;
- return false;
-}
-
-/**
- * binder_find_outdated_transaction_ilocked() - Find the outdated transaction
- * @t: new async transaction
- * @target_list: list to find outdated transaction
- *
- * Return: the outdated transaction if found
- * NULL if no outdated transacton can be found
- *
- * Requires the proc->inner_lock to be held.
- */
-static struct binder_transaction *
-binder_find_outdated_transaction_ilocked(struct binder_transaction *t,
- struct list_head *target_list)
-{
- struct binder_work *w;
-
- list_for_each_entry(w, target_list, entry) {
- struct binder_transaction *t_queued;
-
- if (w->type != BINDER_WORK_TRANSACTION)
- continue;
- t_queued = container_of(w, struct binder_transaction, work);
- if (binder_can_update_transaction(t_queued, t))
- return t_queued;
- }
- return NULL;
-}
-
-/**
- * binder_proc_transaction() - sends a transaction to a process and wakes it up
- * @t: transaction to send
- * @proc: process to send the transaction to
- * @thread: thread in @proc to send the transaction to (may be NULL)
- *
- * This function queues a transaction to the specified process. It will try
- * to find a thread in the target process to handle the transaction and
- * wake it up. If no thread is found, the work is queued to the proc
- * waitqueue.
- *
- * If the @thread parameter is not NULL, the transaction is always queued
- * to the waitlist of that specific thread.
- *
- * Return: 0 if the transaction was successfully queued
- * BR_DEAD_REPLY if the target process or thread is dead
- * BR_FROZEN_REPLY if the target process or thread is frozen and
- * the sync transaction was rejected
- * BR_TRANSACTION_PENDING_FROZEN if the target process is frozen
- * and the async transaction was successfully queued
- */
-static int binder_proc_transaction(struct binder_transaction *t,
- struct binder_proc *proc,
- struct binder_thread *thread)
-{
- struct binder_node *node = t->buffer->target_node;
- bool oneway = !!(t->flags & TF_ONE_WAY);
- bool pending_async = false;
- struct binder_transaction *t_outdated = NULL;
- bool frozen = false;
-
- BUG_ON(!node);
- binder_node_lock(node);
- if (oneway) {
- BUG_ON(thread);
- if (node->has_async_transaction)
- pending_async = true;
- else
- node->has_async_transaction = true;
- }
-
- binder_inner_proc_lock(proc);
- if (proc->is_frozen) {
- frozen = true;
- proc->sync_recv |= !oneway;
- proc->async_recv |= oneway;
- }
-
- if ((frozen && !oneway) || proc->is_dead ||
- (thread && thread->is_dead)) {
- binder_inner_proc_unlock(proc);
- binder_node_unlock(node);
- return frozen ? BR_FROZEN_REPLY : BR_DEAD_REPLY;
- }
-
- if (!thread && !pending_async)
- thread = binder_select_thread_ilocked(proc);
-
- if (thread) {
- binder_enqueue_thread_work_ilocked(thread, &t->work);
- } else if (!pending_async) {
- binder_enqueue_work_ilocked(&t->work, &proc->todo);
- } else {
- if ((t->flags & TF_UPDATE_TXN) && frozen) {
- t_outdated = binder_find_outdated_transaction_ilocked(t,
- &node->async_todo);
- if (t_outdated) {
- binder_debug(BINDER_DEBUG_TRANSACTION,
- "txn %d supersedes %d\n",
- t->debug_id, t_outdated->debug_id);
- list_del_init(&t_outdated->work.entry);
- proc->outstanding_txns--;
- }
- }
- binder_enqueue_work_ilocked(&t->work, &node->async_todo);
- }
-
- if (!pending_async)
- binder_wakeup_thread_ilocked(proc, thread, !oneway /* sync */);
-
- proc->outstanding_txns++;
- binder_inner_proc_unlock(proc);
- binder_node_unlock(node);
-
- /*
- * To reduce potential contention, free the outdated transaction and
- * buffer after releasing the locks.
- */
- if (t_outdated) {
- struct binder_buffer *buffer = t_outdated->buffer;
-
- t_outdated->buffer = NULL;
- buffer->transaction = NULL;
- trace_binder_transaction_update_buffer_release(buffer);
- binder_release_entire_buffer(proc, NULL, buffer, false);
- binder_alloc_free_buf(&proc->alloc, buffer);
- kfree(t_outdated);
- binder_stats_deleted(BINDER_STAT_TRANSACTION);
- }
-
- if (oneway && frozen)
- return BR_TRANSACTION_PENDING_FROZEN;
-
- return 0;
-}
-
-/**
- * binder_get_node_refs_for_txn() - Get required refs on node for txn
- * @node: struct binder_node for which to get refs
- * @procp: returns @node->proc if valid
- * @error: if no @procp then returns BR_DEAD_REPLY
- *
- * User-space normally keeps the node alive when creating a transaction
- * since it has a reference to the target. The local strong ref keeps it
- * alive if the sending process dies before the target process processes
- * the transaction. If the source process is malicious or has a reference
- * counting bug, relying on the local strong ref can fail.
- *
- * Since user-space can cause the local strong ref to go away, we also take
- * a tmpref on the node to ensure it survives while we are constructing
- * the transaction. We also need a tmpref on the proc while we are
- * constructing the transaction, so we take that here as well.
- *
- * Return: The target_node with refs taken or NULL if no @node->proc is NULL.
- * Also sets @procp if valid. If the @node->proc is NULL indicating that the
- * target proc has died, @error is set to BR_DEAD_REPLY.
- */
-static struct binder_node *binder_get_node_refs_for_txn(
- struct binder_node *node,
- struct binder_proc **procp,
- uint32_t *error)
-{
- struct binder_node *target_node = NULL;
-
- binder_node_inner_lock(node);
- if (node->proc) {
- target_node = node;
- binder_inc_node_nilocked(node, 1, 0, NULL);
- binder_inc_node_tmpref_ilocked(node);
- node->proc->tmp_ref++;
- *procp = node->proc;
- } else
- *error = BR_DEAD_REPLY;
- binder_node_inner_unlock(node);
-
- return target_node;
-}
-
-static void binder_set_txn_from_error(struct binder_transaction *t, int id,
- uint32_t command, int32_t param)
-{
- struct binder_thread *from = binder_get_txn_from_and_acq_inner(t);
-
- if (!from) {
- /* annotation for sparse */
- __release(&from->proc->inner_lock);
- return;
- }
-
- /* don't override existing errors */
- if (from->ee.command == BR_OK)
- binder_set_extended_error(&from->ee, id, command, param);
- binder_inner_proc_unlock(from->proc);
- binder_thread_dec_tmpref(from);
-}
-
-static void binder_transaction(struct binder_proc *proc,
- struct binder_thread *thread,
- struct binder_transaction_data *tr, int reply,
- binder_size_t extra_buffers_size)
-{
- int ret;
- struct binder_transaction *t;
- struct binder_work *w;
- struct binder_work *tcomplete;
- binder_size_t buffer_offset = 0;
- binder_size_t off_start_offset, off_end_offset;
- binder_size_t off_min;
- binder_size_t sg_buf_offset, sg_buf_end_offset;
- binder_size_t user_offset = 0;
- struct binder_proc *target_proc = NULL;
- struct binder_thread *target_thread = NULL;
- struct binder_node *target_node = NULL;
- struct binder_transaction *in_reply_to = NULL;
- struct binder_transaction_log_entry *e;
- uint32_t return_error = 0;
- uint32_t return_error_param = 0;
- uint32_t return_error_line = 0;
- binder_size_t last_fixup_obj_off = 0;
- binder_size_t last_fixup_min_off = 0;
- struct binder_context *context = proc->context;
- int t_debug_id = atomic_inc_return(&binder_last_id);
- ktime_t t_start_time = ktime_get();
- char *secctx = NULL;
- u32 secctx_sz = 0;
- struct list_head sgc_head;
- struct list_head pf_head;
- const void __user *user_buffer = (const void __user *)
- (uintptr_t)tr->data.ptr.buffer;
- INIT_LIST_HEAD(&sgc_head);
- INIT_LIST_HEAD(&pf_head);
-
- e = binder_transaction_log_add(&binder_transaction_log);
- e->debug_id = t_debug_id;
- e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
- e->from_proc = proc->pid;
- e->from_thread = thread->pid;
- e->target_handle = tr->target.handle;
- e->data_size = tr->data_size;
- e->offsets_size = tr->offsets_size;
- strscpy(e->context_name, proc->context->name, BINDERFS_MAX_NAME);
-
- binder_inner_proc_lock(proc);
- binder_set_extended_error(&thread->ee, t_debug_id, BR_OK, 0);
- binder_inner_proc_unlock(proc);
-
- if (reply) {
- binder_inner_proc_lock(proc);
- in_reply_to = thread->transaction_stack;
- if (in_reply_to == NULL) {
- binder_inner_proc_unlock(proc);
- binder_user_error("%d:%d got reply transaction with no transaction stack\n",
- proc->pid, thread->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EPROTO;
- return_error_line = __LINE__;
- goto err_empty_call_stack;
- }
- if (in_reply_to->to_thread != thread) {
- spin_lock(&in_reply_to->lock);
- binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
- proc->pid, thread->pid, in_reply_to->debug_id,
- in_reply_to->to_proc ?
- in_reply_to->to_proc->pid : 0,
- in_reply_to->to_thread ?
- in_reply_to->to_thread->pid : 0);
- spin_unlock(&in_reply_to->lock);
- binder_inner_proc_unlock(proc);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EPROTO;
- return_error_line = __LINE__;
- in_reply_to = NULL;
- goto err_bad_call_stack;
- }
- thread->transaction_stack = in_reply_to->to_parent;
- binder_inner_proc_unlock(proc);
- binder_set_nice(in_reply_to->saved_priority);
- target_thread = binder_get_txn_from_and_acq_inner(in_reply_to);
- if (target_thread == NULL) {
- /* annotation for sparse */
- __release(&target_thread->proc->inner_lock);
- binder_txn_error("%d:%d reply target not found\n",
- thread->pid, proc->pid);
- return_error = BR_DEAD_REPLY;
- return_error_line = __LINE__;
- goto err_dead_binder;
- }
- if (target_thread->transaction_stack != in_reply_to) {
- binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
- proc->pid, thread->pid,
- target_thread->transaction_stack ?
- target_thread->transaction_stack->debug_id : 0,
- in_reply_to->debug_id);
- binder_inner_proc_unlock(target_thread->proc);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EPROTO;
- return_error_line = __LINE__;
- in_reply_to = NULL;
- target_thread = NULL;
- goto err_dead_binder;
- }
- target_proc = target_thread->proc;
- target_proc->tmp_ref++;
- binder_inner_proc_unlock(target_thread->proc);
- } else {
- if (tr->target.handle) {
- struct binder_ref *ref;
-
- /*
- * There must already be a strong ref
- * on this node. If so, do a strong
- * increment on the node to ensure it
- * stays alive until the transaction is
- * done.
- */
- binder_proc_lock(proc);
- ref = binder_get_ref_olocked(proc, tr->target.handle,
- true);
- if (ref) {
- target_node = binder_get_node_refs_for_txn(
- ref->node, &target_proc,
- &return_error);
- } else {
- binder_user_error("%d:%d got transaction to invalid handle, %u\n",
- proc->pid, thread->pid, tr->target.handle);
- return_error = BR_FAILED_REPLY;
- }
- binder_proc_unlock(proc);
- } else {
- mutex_lock(&context->context_mgr_node_lock);
- target_node = context->binder_context_mgr_node;
- if (target_node)
- target_node = binder_get_node_refs_for_txn(
- target_node, &target_proc,
- &return_error);
- else
- return_error = BR_DEAD_REPLY;
- mutex_unlock(&context->context_mgr_node_lock);
- if (target_node && target_proc->pid == proc->pid) {
- binder_user_error("%d:%d got transaction to context manager from process owning it\n",
- proc->pid, thread->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_invalid_target_handle;
- }
- }
- if (!target_node) {
- binder_txn_error("%d:%d cannot find target node\n",
- thread->pid, proc->pid);
- /*
- * return_error is set above
- */
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_dead_binder;
- }
- e->to_node = target_node->debug_id;
- if (WARN_ON(proc == target_proc)) {
- binder_txn_error("%d:%d self transactions not allowed\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_invalid_target_handle;
- }
- if (security_binder_transaction(proc->cred,
- target_proc->cred) < 0) {
- binder_txn_error("%d:%d transaction credentials failed\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EPERM;
- return_error_line = __LINE__;
- goto err_invalid_target_handle;
- }
- binder_inner_proc_lock(proc);
-
- w = list_first_entry_or_null(&thread->todo,
- struct binder_work, entry);
- if (!(tr->flags & TF_ONE_WAY) && w &&
- w->type == BINDER_WORK_TRANSACTION) {
- /*
- * Do not allow new outgoing transaction from a
- * thread that has a transaction at the head of
- * its todo list. Only need to check the head
- * because binder_select_thread_ilocked picks a
- * thread from proc->waiting_threads to enqueue
- * the transaction, and nothing is queued to the
- * todo list while the thread is on waiting_threads.
- */
- binder_user_error("%d:%d new transaction not allowed when there is a transaction on thread todo\n",
- proc->pid, thread->pid);
- binder_inner_proc_unlock(proc);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EPROTO;
- return_error_line = __LINE__;
- goto err_bad_todo_list;
- }
-
- if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
- struct binder_transaction *tmp;
-
- tmp = thread->transaction_stack;
- if (tmp->to_thread != thread) {
- spin_lock(&tmp->lock);
- binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
- proc->pid, thread->pid, tmp->debug_id,
- tmp->to_proc ? tmp->to_proc->pid : 0,
- tmp->to_thread ?
- tmp->to_thread->pid : 0);
- spin_unlock(&tmp->lock);
- binder_inner_proc_unlock(proc);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EPROTO;
- return_error_line = __LINE__;
- goto err_bad_call_stack;
- }
- while (tmp) {
- struct binder_thread *from;
-
- spin_lock(&tmp->lock);
- from = tmp->from;
- if (from && from->proc == target_proc) {
- atomic_inc(&from->tmp_ref);
- target_thread = from;
- spin_unlock(&tmp->lock);
- break;
- }
- spin_unlock(&tmp->lock);
- tmp = tmp->from_parent;
- }
- }
- binder_inner_proc_unlock(proc);
- }
- if (target_thread)
- e->to_thread = target_thread->pid;
- e->to_proc = target_proc->pid;
-
- /* TODO: reuse incoming transaction for reply */
- t = kzalloc(sizeof(*t), GFP_KERNEL);
- if (t == NULL) {
- binder_txn_error("%d:%d cannot allocate transaction\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -ENOMEM;
- return_error_line = __LINE__;
- goto err_alloc_t_failed;
- }
- INIT_LIST_HEAD(&t->fd_fixups);
- binder_stats_created(BINDER_STAT_TRANSACTION);
- spin_lock_init(&t->lock);
-
- tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
- if (tcomplete == NULL) {
- binder_txn_error("%d:%d cannot allocate work for transaction\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -ENOMEM;
- return_error_line = __LINE__;
- goto err_alloc_tcomplete_failed;
- }
- binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
-
- t->debug_id = t_debug_id;
- t->start_time = t_start_time;
-
- if (reply)
- binder_debug(BINDER_DEBUG_TRANSACTION,
- "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n",
- proc->pid, thread->pid, t->debug_id,
- target_proc->pid, target_thread->pid,
- (u64)tr->data.ptr.buffer,
- (u64)tr->data.ptr.offsets,
- (u64)tr->data_size, (u64)tr->offsets_size,
- (u64)extra_buffers_size);
- else
- binder_debug(BINDER_DEBUG_TRANSACTION,
- "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n",
- proc->pid, thread->pid, t->debug_id,
- target_proc->pid, target_node->debug_id,
- (u64)tr->data.ptr.buffer,
- (u64)tr->data.ptr.offsets,
- (u64)tr->data_size, (u64)tr->offsets_size,
- (u64)extra_buffers_size);
-
- if (!reply && !(tr->flags & TF_ONE_WAY))
- t->from = thread;
- else
- t->from = NULL;
- t->from_pid = proc->pid;
- t->from_tid = thread->pid;
- t->sender_euid = task_euid(proc->tsk);
- t->to_proc = target_proc;
- t->to_thread = target_thread;
- t->code = tr->code;
- t->flags = tr->flags;
- t->priority = task_nice(current);
-
- if (target_node && target_node->txn_security_ctx) {
- u32 secid;
- size_t added_size;
-
- security_cred_getsecid(proc->cred, &secid);
- ret = security_secid_to_secctx(secid, &secctx, &secctx_sz);
- if (ret) {
- binder_txn_error("%d:%d failed to get security context\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = ret;
- return_error_line = __LINE__;
- goto err_get_secctx_failed;
- }
- added_size = ALIGN(secctx_sz, sizeof(u64));
- extra_buffers_size += added_size;
- if (extra_buffers_size < added_size) {
- binder_txn_error("%d:%d integer overflow of extra_buffers_size\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_extra_size;
- }
- }
-
- trace_binder_transaction(reply, t, target_node);
-
- t->buffer = binder_alloc_new_buf(&target_proc->alloc, tr->data_size,
- tr->offsets_size, extra_buffers_size,
- !reply && (t->flags & TF_ONE_WAY), current->tgid);
- if (IS_ERR(t->buffer)) {
- char *s;
-
- ret = PTR_ERR(t->buffer);
- s = (ret == -ESRCH) ? ": vma cleared, target dead or dying"
- : (ret == -ENOSPC) ? ": no space left"
- : (ret == -ENOMEM) ? ": memory allocation failed"
- : "";
- binder_txn_error("cannot allocate buffer%s", s);
-
- return_error_param = PTR_ERR(t->buffer);
- return_error = return_error_param == -ESRCH ?
- BR_DEAD_REPLY : BR_FAILED_REPLY;
- return_error_line = __LINE__;
- t->buffer = NULL;
- goto err_binder_alloc_buf_failed;
- }
- if (secctx) {
- int err;
- size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) +
- ALIGN(tr->offsets_size, sizeof(void *)) +
- ALIGN(extra_buffers_size, sizeof(void *)) -
- ALIGN(secctx_sz, sizeof(u64));
-
- t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
- err = binder_alloc_copy_to_buffer(&target_proc->alloc,
- t->buffer, buf_offset,
- secctx, secctx_sz);
- if (err) {
- t->security_ctx = 0;
- WARN_ON(1);
- }
- security_release_secctx(secctx, secctx_sz);
- secctx = NULL;
- }
- t->buffer->debug_id = t->debug_id;
- t->buffer->transaction = t;
- t->buffer->target_node = target_node;
- t->buffer->clear_on_free = !!(t->flags & TF_CLEAR_BUF);
- trace_binder_transaction_alloc_buf(t->buffer);
-
- if (binder_alloc_copy_user_to_buffer(
- &target_proc->alloc,
- t->buffer,
- ALIGN(tr->data_size, sizeof(void *)),
- (const void __user *)
- (uintptr_t)tr->data.ptr.offsets,
- tr->offsets_size)) {
- binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
- proc->pid, thread->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EFAULT;
- return_error_line = __LINE__;
- goto err_copy_data_failed;
- }
- if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
- binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
- proc->pid, thread->pid, (u64)tr->offsets_size);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_offset;
- }
- if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) {
- binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n",
- proc->pid, thread->pid,
- (u64)extra_buffers_size);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_offset;
- }
- off_start_offset = ALIGN(tr->data_size, sizeof(void *));
- buffer_offset = off_start_offset;
- off_end_offset = off_start_offset + tr->offsets_size;
- sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
- sg_buf_end_offset = sg_buf_offset + extra_buffers_size -
- ALIGN(secctx_sz, sizeof(u64));
- off_min = 0;
- for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
- buffer_offset += sizeof(binder_size_t)) {
- struct binder_object_header *hdr;
- size_t object_size;
- struct binder_object object;
- binder_size_t object_offset;
- binder_size_t copy_size;
-
- if (binder_alloc_copy_from_buffer(&target_proc->alloc,
- &object_offset,
- t->buffer,
- buffer_offset,
- sizeof(object_offset))) {
- binder_txn_error("%d:%d copy offset from buffer failed\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_offset;
- }
-
- /*
- * Copy the source user buffer up to the next object
- * that will be processed.
- */
- copy_size = object_offset - user_offset;
- if (copy_size && (user_offset > object_offset ||
- binder_alloc_copy_user_to_buffer(
- &target_proc->alloc,
- t->buffer, user_offset,
- user_buffer + user_offset,
- copy_size))) {
- binder_user_error("%d:%d got transaction with invalid data ptr\n",
- proc->pid, thread->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EFAULT;
- return_error_line = __LINE__;
- goto err_copy_data_failed;
- }
- object_size = binder_get_object(target_proc, user_buffer,
- t->buffer, object_offset, &object);
- if (object_size == 0 || object_offset < off_min) {
- binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n",
- proc->pid, thread->pid,
- (u64)object_offset,
- (u64)off_min,
- (u64)t->buffer->data_size);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_offset;
- }
- /*
- * Set offset to the next buffer fragment to be
- * copied
- */
- user_offset = object_offset + object_size;
-
- hdr = &object.hdr;
- off_min = object_offset + object_size;
- switch (hdr->type) {
- case BINDER_TYPE_BINDER:
- case BINDER_TYPE_WEAK_BINDER: {
- struct flat_binder_object *fp;
-
- fp = to_flat_binder_object(hdr);
- ret = binder_translate_binder(fp, t, thread);
-
- if (ret < 0 ||
- binder_alloc_copy_to_buffer(&target_proc->alloc,
- t->buffer,
- object_offset,
- fp, sizeof(*fp))) {
- binder_txn_error("%d:%d translate binder failed\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = ret;
- return_error_line = __LINE__;
- goto err_translate_failed;
- }
- } break;
- case BINDER_TYPE_HANDLE:
- case BINDER_TYPE_WEAK_HANDLE: {
- struct flat_binder_object *fp;
-
- fp = to_flat_binder_object(hdr);
- ret = binder_translate_handle(fp, t, thread);
- if (ret < 0 ||
- binder_alloc_copy_to_buffer(&target_proc->alloc,
- t->buffer,
- object_offset,
- fp, sizeof(*fp))) {
- binder_txn_error("%d:%d translate handle failed\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = ret;
- return_error_line = __LINE__;
- goto err_translate_failed;
- }
- } break;
-
- case BINDER_TYPE_FD: {
- struct binder_fd_object *fp = to_binder_fd_object(hdr);
- binder_size_t fd_offset = object_offset +
- (uintptr_t)&fp->fd - (uintptr_t)fp;
- int ret = binder_translate_fd(fp->fd, fd_offset, t,
- thread, in_reply_to);
-
- fp->pad_binder = 0;
- if (ret < 0 ||
- binder_alloc_copy_to_buffer(&target_proc->alloc,
- t->buffer,
- object_offset,
- fp, sizeof(*fp))) {
- binder_txn_error("%d:%d translate fd failed\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = ret;
- return_error_line = __LINE__;
- goto err_translate_failed;
- }
- } break;
- case BINDER_TYPE_FDA: {
- struct binder_object ptr_object;
- binder_size_t parent_offset;
- struct binder_object user_object;
- size_t user_parent_size;
- struct binder_fd_array_object *fda =
- to_binder_fd_array_object(hdr);
- size_t num_valid = (buffer_offset - off_start_offset) /
- sizeof(binder_size_t);
- struct binder_buffer_object *parent =
- binder_validate_ptr(target_proc, t->buffer,
- &ptr_object, fda->parent,
- off_start_offset,
- &parent_offset,
- num_valid);
- if (!parent) {
- binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
- proc->pid, thread->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_parent;
- }
- if (!binder_validate_fixup(target_proc, t->buffer,
- off_start_offset,
- parent_offset,
- fda->parent_offset,
- last_fixup_obj_off,
- last_fixup_min_off)) {
- binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
- proc->pid, thread->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_parent;
- }
- /*
- * We need to read the user version of the parent
- * object to get the original user offset
- */
- user_parent_size =
- binder_get_object(proc, user_buffer, t->buffer,
- parent_offset, &user_object);
- if (user_parent_size != sizeof(user_object.bbo)) {
- binder_user_error("%d:%d invalid ptr object size: %zd vs %zd\n",
- proc->pid, thread->pid,
- user_parent_size,
- sizeof(user_object.bbo));
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_parent;
- }
- ret = binder_translate_fd_array(&pf_head, fda,
- user_buffer, parent,
- &user_object.bbo, t,
- thread, in_reply_to);
- if (!ret)
- ret = binder_alloc_copy_to_buffer(&target_proc->alloc,
- t->buffer,
- object_offset,
- fda, sizeof(*fda));
- if (ret) {
- binder_txn_error("%d:%d translate fd array failed\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = ret > 0 ? -EINVAL : ret;
- return_error_line = __LINE__;
- goto err_translate_failed;
- }
- last_fixup_obj_off = parent_offset;
- last_fixup_min_off =
- fda->parent_offset + sizeof(u32) * fda->num_fds;
- } break;
- case BINDER_TYPE_PTR: {
- struct binder_buffer_object *bp =
- to_binder_buffer_object(hdr);
- size_t buf_left = sg_buf_end_offset - sg_buf_offset;
- size_t num_valid;
-
- if (bp->length > buf_left) {
- binder_user_error("%d:%d got transaction with too large buffer\n",
- proc->pid, thread->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_offset;
- }
- ret = binder_defer_copy(&sgc_head, sg_buf_offset,
- (const void __user *)(uintptr_t)bp->buffer,
- bp->length);
- if (ret) {
- binder_txn_error("%d:%d deferred copy failed\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = ret;
- return_error_line = __LINE__;
- goto err_translate_failed;
- }
- /* Fixup buffer pointer to target proc address space */
- bp->buffer = (uintptr_t)
- t->buffer->user_data + sg_buf_offset;
- sg_buf_offset += ALIGN(bp->length, sizeof(u64));
-
- num_valid = (buffer_offset - off_start_offset) /
- sizeof(binder_size_t);
- ret = binder_fixup_parent(&pf_head, t,
- thread, bp,
- off_start_offset,
- num_valid,
- last_fixup_obj_off,
- last_fixup_min_off);
- if (ret < 0 ||
- binder_alloc_copy_to_buffer(&target_proc->alloc,
- t->buffer,
- object_offset,
- bp, sizeof(*bp))) {
- binder_txn_error("%d:%d failed to fixup parent\n",
- thread->pid, proc->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = ret;
- return_error_line = __LINE__;
- goto err_translate_failed;
- }
- last_fixup_obj_off = object_offset;
- last_fixup_min_off = 0;
- } break;
- default:
- binder_user_error("%d:%d got transaction with invalid object type, %x\n",
- proc->pid, thread->pid, hdr->type);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EINVAL;
- return_error_line = __LINE__;
- goto err_bad_object_type;
- }
- }
- /* Done processing objects, copy the rest of the buffer */
- if (binder_alloc_copy_user_to_buffer(
- &target_proc->alloc,
- t->buffer, user_offset,
- user_buffer + user_offset,
- tr->data_size - user_offset)) {
- binder_user_error("%d:%d got transaction with invalid data ptr\n",
- proc->pid, thread->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = -EFAULT;
- return_error_line = __LINE__;
- goto err_copy_data_failed;
- }
-
- ret = binder_do_deferred_txn_copies(&target_proc->alloc, t->buffer,
- &sgc_head, &pf_head);
- if (ret) {
- binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
- proc->pid, thread->pid);
- return_error = BR_FAILED_REPLY;
- return_error_param = ret;
- return_error_line = __LINE__;
- goto err_copy_data_failed;
- }
- if (t->buffer->oneway_spam_suspect)
- tcomplete->type = BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT;
- else
- tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
- t->work.type = BINDER_WORK_TRANSACTION;
-
- if (reply) {
- binder_enqueue_thread_work(thread, tcomplete);
- binder_inner_proc_lock(target_proc);
- if (target_thread->is_dead) {
- return_error = BR_DEAD_REPLY;
- binder_inner_proc_unlock(target_proc);
- goto err_dead_proc_or_thread;
- }
- BUG_ON(t->buffer->async_transaction != 0);
- binder_pop_transaction_ilocked(target_thread, in_reply_to);
- binder_enqueue_thread_work_ilocked(target_thread, &t->work);
- target_proc->outstanding_txns++;
- binder_inner_proc_unlock(target_proc);
- wake_up_interruptible_sync(&target_thread->wait);
- binder_free_transaction(in_reply_to);
- } else if (!(t->flags & TF_ONE_WAY)) {
- BUG_ON(t->buffer->async_transaction != 0);
- binder_inner_proc_lock(proc);
- /*
- * Defer the TRANSACTION_COMPLETE, so we don't return to
- * userspace immediately; this allows the target process to
- * immediately start processing this transaction, reducing
- * latency. We will then return the TRANSACTION_COMPLETE when
- * the target replies (or there is an error).
- */
- binder_enqueue_deferred_thread_work_ilocked(thread, tcomplete);
- t->need_reply = 1;
- t->from_parent = thread->transaction_stack;
- thread->transaction_stack = t;
- binder_inner_proc_unlock(proc);
- return_error = binder_proc_transaction(t,
- target_proc, target_thread);
- if (return_error) {
- binder_inner_proc_lock(proc);
- binder_pop_transaction_ilocked(thread, t);
- binder_inner_proc_unlock(proc);
- goto err_dead_proc_or_thread;
- }
- } else {
- BUG_ON(target_node == NULL);
- BUG_ON(t->buffer->async_transaction != 1);
- return_error = binder_proc_transaction(t, target_proc, NULL);
- /*
- * Let the caller know when async transaction reaches a frozen
- * process and is put in a pending queue, waiting for the target
- * process to be unfrozen.
- */
- if (return_error == BR_TRANSACTION_PENDING_FROZEN)
- tcomplete->type = BINDER_WORK_TRANSACTION_PENDING;
- binder_enqueue_thread_work(thread, tcomplete);
- if (return_error &&
- return_error != BR_TRANSACTION_PENDING_FROZEN)
- goto err_dead_proc_or_thread;
- }
- if (target_thread)
- binder_thread_dec_tmpref(target_thread);
- binder_proc_dec_tmpref(target_proc);
- if (target_node)
- binder_dec_node_tmpref(target_node);
- /*
- * write barrier to synchronize with initialization
- * of log entry
- */
- smp_wmb();
- WRITE_ONCE(e->debug_id_done, t_debug_id);
- return;
-
-err_dead_proc_or_thread:
- binder_txn_error("%d:%d dead process or thread\n",
- thread->pid, proc->pid);
- return_error_line = __LINE__;
- binder_dequeue_work(proc, tcomplete);
-err_translate_failed:
-err_bad_object_type:
-err_bad_offset:
-err_bad_parent:
-err_copy_data_failed:
- binder_cleanup_deferred_txn_lists(&sgc_head, &pf_head);
- binder_free_txn_fixups(t);
- trace_binder_transaction_failed_buffer_release(t->buffer);
- binder_transaction_buffer_release(target_proc, NULL, t->buffer,
- buffer_offset, true);
- if (target_node)
- binder_dec_node_tmpref(target_node);
- target_node = NULL;
- t->buffer->transaction = NULL;
- binder_alloc_free_buf(&target_proc->alloc, t->buffer);
-err_binder_alloc_buf_failed:
-err_bad_extra_size:
- if (secctx)
- security_release_secctx(secctx, secctx_sz);
-err_get_secctx_failed:
- kfree(tcomplete);
- binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
-err_alloc_tcomplete_failed:
- if (trace_binder_txn_latency_free_enabled())
- binder_txn_latency_free(t);
- kfree(t);
- binder_stats_deleted(BINDER_STAT_TRANSACTION);
-err_alloc_t_failed:
-err_bad_todo_list:
-err_bad_call_stack:
-err_empty_call_stack:
-err_dead_binder:
-err_invalid_target_handle:
- if (target_node) {
- binder_dec_node(target_node, 1, 0);
- binder_dec_node_tmpref(target_node);
- }
-
- binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
- "%d:%d transaction %s to %d:%d failed %d/%d/%d, size %lld-%lld line %d\n",
- proc->pid, thread->pid, reply ? "reply" :
- (tr->flags & TF_ONE_WAY ? "async" : "call"),
- target_proc ? target_proc->pid : 0,
- target_thread ? target_thread->pid : 0,
- t_debug_id, return_error, return_error_param,
- (u64)tr->data_size, (u64)tr->offsets_size,
- return_error_line);
-
- if (target_thread)
- binder_thread_dec_tmpref(target_thread);
- if (target_proc)
- binder_proc_dec_tmpref(target_proc);
-
- {
- struct binder_transaction_log_entry *fe;
-
- e->return_error = return_error;
- e->return_error_param = return_error_param;
- e->return_error_line = return_error_line;
- fe = binder_transaction_log_add(&binder_transaction_log_failed);
- *fe = *e;
- /*
- * write barrier to synchronize with initialization
- * of log entry
- */
- smp_wmb();
- WRITE_ONCE(e->debug_id_done, t_debug_id);
- WRITE_ONCE(fe->debug_id_done, t_debug_id);
- }
-
- BUG_ON(thread->return_error.cmd != BR_OK);
- if (in_reply_to) {
- binder_set_txn_from_error(in_reply_to, t_debug_id,
- return_error, return_error_param);
- thread->return_error.cmd = BR_TRANSACTION_COMPLETE;
- binder_enqueue_thread_work(thread, &thread->return_error.work);
- binder_send_failed_reply(in_reply_to, return_error);
- } else {
- binder_inner_proc_lock(proc);
- binder_set_extended_error(&thread->ee, t_debug_id,
- return_error, return_error_param);
- binder_inner_proc_unlock(proc);
- thread->return_error.cmd = return_error;
- binder_enqueue_thread_work(thread, &thread->return_error.work);
- }
-}
-
-/**
- * binder_free_buf() - free the specified buffer
- * @proc: binder proc that owns buffer
- * @buffer: buffer to be freed
- * @is_failure: failed to send transaction
- *
- * If buffer for an async transaction, enqueue the next async
- * transaction from the node.
- *
- * Cleanup buffer and free it.
- */
-static void
-binder_free_buf(struct binder_proc *proc,
- struct binder_thread *thread,
- struct binder_buffer *buffer, bool is_failure)
-{
- binder_inner_proc_lock(proc);
- if (buffer->transaction) {
- buffer->transaction->buffer = NULL;
- buffer->transaction = NULL;
- }
- binder_inner_proc_unlock(proc);
- if (buffer->async_transaction && buffer->target_node) {
- struct binder_node *buf_node;
- struct binder_work *w;
-
- buf_node = buffer->target_node;
- binder_node_inner_lock(buf_node);
- BUG_ON(!buf_node->has_async_transaction);
- BUG_ON(buf_node->proc != proc);
- w = binder_dequeue_work_head_ilocked(
- &buf_node->async_todo);
- if (!w) {
- buf_node->has_async_transaction = false;
- } else {
- binder_enqueue_work_ilocked(
- w, &proc->todo);
- binder_wakeup_proc_ilocked(proc);
- }
- binder_node_inner_unlock(buf_node);
- }
- trace_binder_transaction_buffer_release(buffer);
- binder_release_entire_buffer(proc, thread, buffer, is_failure);
- binder_alloc_free_buf(&proc->alloc, buffer);
-}
-
-static int binder_thread_write(struct binder_proc *proc,
- struct binder_thread *thread,
- binder_uintptr_t binder_buffer, size_t size,
- binder_size_t *consumed)
-{
- uint32_t cmd;
- struct binder_context *context = proc->context;
- void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
- void __user *ptr = buffer + *consumed;
- void __user *end = buffer + size;
-
- while (ptr < end && thread->return_error.cmd == BR_OK) {
- int ret;
-
- if (get_user(cmd, (uint32_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(uint32_t);
- trace_binder_command(cmd);
- if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
- atomic_inc(&binder_stats.bc[_IOC_NR(cmd)]);
- atomic_inc(&proc->stats.bc[_IOC_NR(cmd)]);
- atomic_inc(&thread->stats.bc[_IOC_NR(cmd)]);
- }
- switch (cmd) {
- case BC_INCREFS:
- case BC_ACQUIRE:
- case BC_RELEASE:
- case BC_DECREFS: {
- uint32_t target;
- const char *debug_string;
- bool strong = cmd == BC_ACQUIRE || cmd == BC_RELEASE;
- bool increment = cmd == BC_INCREFS || cmd == BC_ACQUIRE;
- struct binder_ref_data rdata;
-
- if (get_user(target, (uint32_t __user *)ptr))
- return -EFAULT;
-
- ptr += sizeof(uint32_t);
- ret = -1;
- if (increment && !target) {
- struct binder_node *ctx_mgr_node;
-
- mutex_lock(&context->context_mgr_node_lock);
- ctx_mgr_node = context->binder_context_mgr_node;
- if (ctx_mgr_node) {
- if (ctx_mgr_node->proc == proc) {
- binder_user_error("%d:%d context manager tried to acquire desc 0\n",
- proc->pid, thread->pid);
- mutex_unlock(&context->context_mgr_node_lock);
- return -EINVAL;
- }
- ret = binder_inc_ref_for_node(
- proc, ctx_mgr_node,
- strong, NULL, &rdata);
- }
- mutex_unlock(&context->context_mgr_node_lock);
- }
- if (ret)
- ret = binder_update_ref_for_handle(
- proc, target, increment, strong,
- &rdata);
- if (!ret && rdata.desc != target) {
- binder_user_error("%d:%d tried to acquire reference to desc %d, got %d instead\n",
- proc->pid, thread->pid,
- target, rdata.desc);
- }
- switch (cmd) {
- case BC_INCREFS:
- debug_string = "IncRefs";
- break;
- case BC_ACQUIRE:
- debug_string = "Acquire";
- break;
- case BC_RELEASE:
- debug_string = "Release";
- break;
- case BC_DECREFS:
- default:
- debug_string = "DecRefs";
- break;
- }
- if (ret) {
- binder_user_error("%d:%d %s %d refcount change on invalid ref %d ret %d\n",
- proc->pid, thread->pid, debug_string,
- strong, target, ret);
- break;
- }
- binder_debug(BINDER_DEBUG_USER_REFS,
- "%d:%d %s ref %d desc %d s %d w %d\n",
- proc->pid, thread->pid, debug_string,
- rdata.debug_id, rdata.desc, rdata.strong,
- rdata.weak);
- break;
- }
- case BC_INCREFS_DONE:
- case BC_ACQUIRE_DONE: {
- binder_uintptr_t node_ptr;
- binder_uintptr_t cookie;
- struct binder_node *node;
- bool free_node;
-
- if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(binder_uintptr_t);
- if (get_user(cookie, (binder_uintptr_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(binder_uintptr_t);
- node = binder_get_node(proc, node_ptr);
- if (node == NULL) {
- binder_user_error("%d:%d %s u%016llx no match\n",
- proc->pid, thread->pid,
- cmd == BC_INCREFS_DONE ?
- "BC_INCREFS_DONE" :
- "BC_ACQUIRE_DONE",
- (u64)node_ptr);
- break;
- }
- if (cookie != node->cookie) {
- binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
- proc->pid, thread->pid,
- cmd == BC_INCREFS_DONE ?
- "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
- (u64)node_ptr, node->debug_id,
- (u64)cookie, (u64)node->cookie);
- binder_put_node(node);
- break;
- }
- binder_node_inner_lock(node);
- if (cmd == BC_ACQUIRE_DONE) {
- if (node->pending_strong_ref == 0) {
- binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
- proc->pid, thread->pid,
- node->debug_id);
- binder_node_inner_unlock(node);
- binder_put_node(node);
- break;
- }
- node->pending_strong_ref = 0;
- } else {
- if (node->pending_weak_ref == 0) {
- binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
- proc->pid, thread->pid,
- node->debug_id);
- binder_node_inner_unlock(node);
- binder_put_node(node);
- break;
- }
- node->pending_weak_ref = 0;
- }
- free_node = binder_dec_node_nilocked(node,
- cmd == BC_ACQUIRE_DONE, 0);
- WARN_ON(free_node);
- binder_debug(BINDER_DEBUG_USER_REFS,
- "%d:%d %s node %d ls %d lw %d tr %d\n",
- proc->pid, thread->pid,
- cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
- node->debug_id, node->local_strong_refs,
- node->local_weak_refs, node->tmp_refs);
- binder_node_inner_unlock(node);
- binder_put_node(node);
- break;
- }
- case BC_ATTEMPT_ACQUIRE:
- pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
- return -EINVAL;
- case BC_ACQUIRE_RESULT:
- pr_err("BC_ACQUIRE_RESULT not supported\n");
- return -EINVAL;
-
- case BC_FREE_BUFFER: {
- binder_uintptr_t data_ptr;
- struct binder_buffer *buffer;
-
- if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(binder_uintptr_t);
-
- buffer = binder_alloc_prepare_to_free(&proc->alloc,
- data_ptr);
- if (IS_ERR_OR_NULL(buffer)) {
- if (PTR_ERR(buffer) == -EPERM) {
- binder_user_error(
- "%d:%d BC_FREE_BUFFER u%016llx matched unreturned or currently freeing buffer\n",
- proc->pid, thread->pid,
- (u64)data_ptr);
- } else {
- binder_user_error(
- "%d:%d BC_FREE_BUFFER u%016llx no match\n",
- proc->pid, thread->pid,
- (u64)data_ptr);
- }
- break;
- }
- binder_debug(BINDER_DEBUG_FREE_BUFFER,
- "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
- proc->pid, thread->pid, (u64)data_ptr,
- buffer->debug_id,
- buffer->transaction ? "active" : "finished");
- binder_free_buf(proc, thread, buffer, false);
- break;
- }
-
- case BC_TRANSACTION_SG:
- case BC_REPLY_SG: {
- struct binder_transaction_data_sg tr;
-
- if (copy_from_user(&tr, ptr, sizeof(tr)))
- return -EFAULT;
- ptr += sizeof(tr);
- binder_transaction(proc, thread, &tr.transaction_data,
- cmd == BC_REPLY_SG, tr.buffers_size);
- break;
- }
- case BC_TRANSACTION:
- case BC_REPLY: {
- struct binder_transaction_data tr;
-
- if (copy_from_user(&tr, ptr, sizeof(tr)))
- return -EFAULT;
- ptr += sizeof(tr);
- binder_transaction(proc, thread, &tr,
- cmd == BC_REPLY, 0);
- break;
- }
-
- case BC_REGISTER_LOOPER:
- binder_debug(BINDER_DEBUG_THREADS,
- "%d:%d BC_REGISTER_LOOPER\n",
- proc->pid, thread->pid);
- binder_inner_proc_lock(proc);
- if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
- thread->looper |= BINDER_LOOPER_STATE_INVALID;
- binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
- proc->pid, thread->pid);
- } else if (proc->requested_threads == 0) {
- thread->looper |= BINDER_LOOPER_STATE_INVALID;
- binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
- proc->pid, thread->pid);
- } else {
- proc->requested_threads--;
- proc->requested_threads_started++;
- }
- thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
- binder_inner_proc_unlock(proc);
- break;
- case BC_ENTER_LOOPER:
- binder_debug(BINDER_DEBUG_THREADS,
- "%d:%d BC_ENTER_LOOPER\n",
- proc->pid, thread->pid);
- if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
- thread->looper |= BINDER_LOOPER_STATE_INVALID;
- binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
- proc->pid, thread->pid);
- }
- thread->looper |= BINDER_LOOPER_STATE_ENTERED;
- break;
- case BC_EXIT_LOOPER:
- binder_debug(BINDER_DEBUG_THREADS,
- "%d:%d BC_EXIT_LOOPER\n",
- proc->pid, thread->pid);
- thread->looper |= BINDER_LOOPER_STATE_EXITED;
- break;
-
- case BC_REQUEST_DEATH_NOTIFICATION:
- case BC_CLEAR_DEATH_NOTIFICATION: {
- uint32_t target;
- binder_uintptr_t cookie;
- struct binder_ref *ref;
- struct binder_ref_death *death = NULL;
-
- if (get_user(target, (uint32_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(uint32_t);
- if (get_user(cookie, (binder_uintptr_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(binder_uintptr_t);
- if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
- /*
- * Allocate memory for death notification
- * before taking lock
- */
- death = kzalloc(sizeof(*death), GFP_KERNEL);
- if (death == NULL) {
- WARN_ON(thread->return_error.cmd !=
- BR_OK);
- thread->return_error.cmd = BR_ERROR;
- binder_enqueue_thread_work(
- thread,
- &thread->return_error.work);
- binder_debug(
- BINDER_DEBUG_FAILED_TRANSACTION,
- "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
- proc->pid, thread->pid);
- break;
- }
- }
- binder_proc_lock(proc);
- ref = binder_get_ref_olocked(proc, target, false);
- if (ref == NULL) {
- binder_user_error("%d:%d %s invalid ref %d\n",
- proc->pid, thread->pid,
- cmd == BC_REQUEST_DEATH_NOTIFICATION ?
- "BC_REQUEST_DEATH_NOTIFICATION" :
- "BC_CLEAR_DEATH_NOTIFICATION",
- target);
- binder_proc_unlock(proc);
- kfree(death);
- break;
- }
-
- binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
- "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
- proc->pid, thread->pid,
- cmd == BC_REQUEST_DEATH_NOTIFICATION ?
- "BC_REQUEST_DEATH_NOTIFICATION" :
- "BC_CLEAR_DEATH_NOTIFICATION",
- (u64)cookie, ref->data.debug_id,
- ref->data.desc, ref->data.strong,
- ref->data.weak, ref->node->debug_id);
-
- binder_node_lock(ref->node);
- if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
- if (ref->death) {
- binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
- proc->pid, thread->pid);
- binder_node_unlock(ref->node);
- binder_proc_unlock(proc);
- kfree(death);
- break;
- }
- binder_stats_created(BINDER_STAT_DEATH);
- INIT_LIST_HEAD(&death->work.entry);
- death->cookie = cookie;
- ref->death = death;
- if (ref->node->proc == NULL) {
- ref->death->work.type = BINDER_WORK_DEAD_BINDER;
-
- binder_inner_proc_lock(proc);
- binder_enqueue_work_ilocked(
- &ref->death->work, &proc->todo);
- binder_wakeup_proc_ilocked(proc);
- binder_inner_proc_unlock(proc);
- }
- } else {
- if (ref->death == NULL) {
- binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
- proc->pid, thread->pid);
- binder_node_unlock(ref->node);
- binder_proc_unlock(proc);
- break;
- }
- death = ref->death;
- if (death->cookie != cookie) {
- binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
- proc->pid, thread->pid,
- (u64)death->cookie,
- (u64)cookie);
- binder_node_unlock(ref->node);
- binder_proc_unlock(proc);
- break;
- }
- ref->death = NULL;
- binder_inner_proc_lock(proc);
- if (list_empty(&death->work.entry)) {
- death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
- if (thread->looper &
- (BINDER_LOOPER_STATE_REGISTERED |
- BINDER_LOOPER_STATE_ENTERED))
- binder_enqueue_thread_work_ilocked(
- thread,
- &death->work);
- else {
- binder_enqueue_work_ilocked(
- &death->work,
- &proc->todo);
- binder_wakeup_proc_ilocked(
- proc);
- }
- } else {
- BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
- death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
- }
- binder_inner_proc_unlock(proc);
- }
- binder_node_unlock(ref->node);
- binder_proc_unlock(proc);
- } break;
- case BC_DEAD_BINDER_DONE: {
- struct binder_work *w;
- binder_uintptr_t cookie;
- struct binder_ref_death *death = NULL;
-
- if (get_user(cookie, (binder_uintptr_t __user *)ptr))
- return -EFAULT;
-
- ptr += sizeof(cookie);
- binder_inner_proc_lock(proc);
- list_for_each_entry(w, &proc->delivered_death,
- entry) {
- struct binder_ref_death *tmp_death =
- container_of(w,
- struct binder_ref_death,
- work);
-
- if (tmp_death->cookie == cookie) {
- death = tmp_death;
- break;
- }
- }
- binder_debug(BINDER_DEBUG_DEAD_BINDER,
- "%d:%d BC_DEAD_BINDER_DONE %016llx found %pK\n",
- proc->pid, thread->pid, (u64)cookie,
- death);
- if (death == NULL) {
- binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
- proc->pid, thread->pid, (u64)cookie);
- binder_inner_proc_unlock(proc);
- break;
- }
- binder_dequeue_work_ilocked(&death->work);
- if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
- death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
- if (thread->looper &
- (BINDER_LOOPER_STATE_REGISTERED |
- BINDER_LOOPER_STATE_ENTERED))
- binder_enqueue_thread_work_ilocked(
- thread, &death->work);
- else {
- binder_enqueue_work_ilocked(
- &death->work,
- &proc->todo);
- binder_wakeup_proc_ilocked(proc);
- }
- }
- binder_inner_proc_unlock(proc);
- } break;
-
- default:
- pr_err("%d:%d unknown command %u\n",
- proc->pid, thread->pid, cmd);
- return -EINVAL;
- }
- *consumed = ptr - buffer;
- }
- return 0;
-}
-
-static void binder_stat_br(struct binder_proc *proc,
- struct binder_thread *thread, uint32_t cmd)
-{
- trace_binder_return(cmd);
- if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
- atomic_inc(&binder_stats.br[_IOC_NR(cmd)]);
- atomic_inc(&proc->stats.br[_IOC_NR(cmd)]);
- atomic_inc(&thread->stats.br[_IOC_NR(cmd)]);
- }
-}
-
-static int binder_put_node_cmd(struct binder_proc *proc,
- struct binder_thread *thread,
- void __user **ptrp,
- binder_uintptr_t node_ptr,
- binder_uintptr_t node_cookie,
- int node_debug_id,
- uint32_t cmd, const char *cmd_name)
-{
- void __user *ptr = *ptrp;
-
- if (put_user(cmd, (uint32_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(uint32_t);
-
- if (put_user(node_ptr, (binder_uintptr_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(binder_uintptr_t);
-
- if (put_user(node_cookie, (binder_uintptr_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(binder_uintptr_t);
-
- binder_stat_br(proc, thread, cmd);
- binder_debug(BINDER_DEBUG_USER_REFS, "%d:%d %s %d u%016llx c%016llx\n",
- proc->pid, thread->pid, cmd_name, node_debug_id,
- (u64)node_ptr, (u64)node_cookie);
-
- *ptrp = ptr;
- return 0;
-}
-
-static int binder_wait_for_work(struct binder_thread *thread,
- bool do_proc_work)
-{
- DEFINE_WAIT(wait);
- struct binder_proc *proc = thread->proc;
- int ret = 0;
-
- binder_inner_proc_lock(proc);
- for (;;) {
- prepare_to_wait(&thread->wait, &wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE);
- if (binder_has_work_ilocked(thread, do_proc_work))
- break;
- if (do_proc_work)
- list_add(&thread->waiting_thread_node,
- &proc->waiting_threads);
- binder_inner_proc_unlock(proc);
- schedule();
- binder_inner_proc_lock(proc);
- list_del_init(&thread->waiting_thread_node);
- if (signal_pending(current)) {
- ret = -EINTR;
- break;
- }
- }
- finish_wait(&thread->wait, &wait);
- binder_inner_proc_unlock(proc);
-
- return ret;
-}
-
-/**
- * binder_apply_fd_fixups() - finish fd translation
- * @proc: binder_proc associated @t->buffer
- * @t: binder transaction with list of fd fixups
- *
- * Now that we are in the context of the transaction target
- * process, we can allocate and install fds. Process the
- * list of fds to translate and fixup the buffer with the
- * new fds first and only then install the files.
- *
- * If we fail to allocate an fd, skip the install and release
- * any fds that have already been allocated.
- */
-static int binder_apply_fd_fixups(struct binder_proc *proc,
- struct binder_transaction *t)
-{
- struct binder_txn_fd_fixup *fixup, *tmp;
- int ret = 0;
-
- list_for_each_entry(fixup, &t->fd_fixups, fixup_entry) {
- int fd = get_unused_fd_flags(O_CLOEXEC);
-
- if (fd < 0) {
- binder_debug(BINDER_DEBUG_TRANSACTION,
- "failed fd fixup txn %d fd %d\n",
- t->debug_id, fd);
- ret = -ENOMEM;
- goto err;
- }
- binder_debug(BINDER_DEBUG_TRANSACTION,
- "fd fixup txn %d fd %d\n",
- t->debug_id, fd);
- trace_binder_transaction_fd_recv(t, fd, fixup->offset);
- fixup->target_fd = fd;
- if (binder_alloc_copy_to_buffer(&proc->alloc, t->buffer,
- fixup->offset, &fd,
- sizeof(u32))) {
- ret = -EINVAL;
- goto err;
- }
- }
- list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) {
- fd_install(fixup->target_fd, fixup->file);
- list_del(&fixup->fixup_entry);
- kfree(fixup);
- }
-
- return ret;
-
-err:
- binder_free_txn_fixups(t);
- return ret;
-}
-
-static int binder_thread_read(struct binder_proc *proc,
- struct binder_thread *thread,
- binder_uintptr_t binder_buffer, size_t size,
- binder_size_t *consumed, int non_block)
-{
- void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
- void __user *ptr = buffer + *consumed;
- void __user *end = buffer + size;
-
- int ret = 0;
- int wait_for_proc_work;
-
- if (*consumed == 0) {
- if (put_user(BR_NOOP, (uint32_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(uint32_t);
- }
-
-retry:
- binder_inner_proc_lock(proc);
- wait_for_proc_work = binder_available_for_proc_work_ilocked(thread);
- binder_inner_proc_unlock(proc);
-
- thread->looper |= BINDER_LOOPER_STATE_WAITING;
-
- trace_binder_wait_for_work(wait_for_proc_work,
- !!thread->transaction_stack,
- !binder_worklist_empty(proc, &thread->todo));
- if (wait_for_proc_work) {
- if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
- BINDER_LOOPER_STATE_ENTERED))) {
- binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
- proc->pid, thread->pid, thread->looper);
- wait_event_interruptible(binder_user_error_wait,
- binder_stop_on_user_error < 2);
- }
- binder_set_nice(proc->default_priority);
- }
-
- if (non_block) {
- if (!binder_has_work(thread, wait_for_proc_work))
- ret = -EAGAIN;
- } else {
- ret = binder_wait_for_work(thread, wait_for_proc_work);
- }
-
- thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
-
- if (ret)
- return ret;
-
- while (1) {
- uint32_t cmd;
- struct binder_transaction_data_secctx tr;
- struct binder_transaction_data *trd = &tr.transaction_data;
- struct binder_work *w = NULL;
- struct list_head *list = NULL;
- struct binder_transaction *t = NULL;
- struct binder_thread *t_from;
- size_t trsize = sizeof(*trd);
-
- binder_inner_proc_lock(proc);
- if (!binder_worklist_empty_ilocked(&thread->todo))
- list = &thread->todo;
- else if (!binder_worklist_empty_ilocked(&proc->todo) &&
- wait_for_proc_work)
- list = &proc->todo;
- else {
- binder_inner_proc_unlock(proc);
-
- /* no data added */
- if (ptr - buffer == 4 && !thread->looper_need_return)
- goto retry;
- break;
- }
-
- if (end - ptr < sizeof(tr) + 4) {
- binder_inner_proc_unlock(proc);
- break;
- }
- w = binder_dequeue_work_head_ilocked(list);
- if (binder_worklist_empty_ilocked(&thread->todo))
- thread->process_todo = false;
-
- switch (w->type) {
- case BINDER_WORK_TRANSACTION: {
- binder_inner_proc_unlock(proc);
- t = container_of(w, struct binder_transaction, work);
- } break;
- case BINDER_WORK_RETURN_ERROR: {
- struct binder_error *e = container_of(
- w, struct binder_error, work);
-
- WARN_ON(e->cmd == BR_OK);
- binder_inner_proc_unlock(proc);
- if (put_user(e->cmd, (uint32_t __user *)ptr))
- return -EFAULT;
- cmd = e->cmd;
- e->cmd = BR_OK;
- ptr += sizeof(uint32_t);
-
- binder_stat_br(proc, thread, cmd);
- } break;
- case BINDER_WORK_TRANSACTION_COMPLETE:
- case BINDER_WORK_TRANSACTION_PENDING:
- case BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT: {
- if (proc->oneway_spam_detection_enabled &&
- w->type == BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT)
- cmd = BR_ONEWAY_SPAM_SUSPECT;
- else if (w->type == BINDER_WORK_TRANSACTION_PENDING)
- cmd = BR_TRANSACTION_PENDING_FROZEN;
- else
- cmd = BR_TRANSACTION_COMPLETE;
- binder_inner_proc_unlock(proc);
- kfree(w);
- binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
- if (put_user(cmd, (uint32_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(uint32_t);
-
- binder_stat_br(proc, thread, cmd);
- binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
- "%d:%d BR_TRANSACTION_COMPLETE\n",
- proc->pid, thread->pid);
- } break;
- case BINDER_WORK_NODE: {
- struct binder_node *node = container_of(w, struct binder_node, work);
- int strong, weak;
- binder_uintptr_t node_ptr = node->ptr;
- binder_uintptr_t node_cookie = node->cookie;
- int node_debug_id = node->debug_id;
- int has_weak_ref;
- int has_strong_ref;
- void __user *orig_ptr = ptr;
-
- BUG_ON(proc != node->proc);
- strong = node->internal_strong_refs ||
- node->local_strong_refs;
- weak = !hlist_empty(&node->refs) ||
- node->local_weak_refs ||
- node->tmp_refs || strong;
- has_strong_ref = node->has_strong_ref;
- has_weak_ref = node->has_weak_ref;
-
- if (weak && !has_weak_ref) {
- node->has_weak_ref = 1;
- node->pending_weak_ref = 1;
- node->local_weak_refs++;
- }
- if (strong && !has_strong_ref) {
- node->has_strong_ref = 1;
- node->pending_strong_ref = 1;
- node->local_strong_refs++;
- }
- if (!strong && has_strong_ref)
- node->has_strong_ref = 0;
- if (!weak && has_weak_ref)
- node->has_weak_ref = 0;
- if (!weak && !strong) {
- binder_debug(BINDER_DEBUG_INTERNAL_REFS,
- "%d:%d node %d u%016llx c%016llx deleted\n",
- proc->pid, thread->pid,
- node_debug_id,
- (u64)node_ptr,
- (u64)node_cookie);
- rb_erase(&node->rb_node, &proc->nodes);
- binder_inner_proc_unlock(proc);
- binder_node_lock(node);
- /*
- * Acquire the node lock before freeing the
- * node to serialize with other threads that
- * may have been holding the node lock while
- * decrementing this node (avoids race where
- * this thread frees while the other thread
- * is unlocking the node after the final
- * decrement)
- */
- binder_node_unlock(node);
- binder_free_node(node);
- } else
- binder_inner_proc_unlock(proc);
-
- if (weak && !has_weak_ref)
- ret = binder_put_node_cmd(
- proc, thread, &ptr, node_ptr,
- node_cookie, node_debug_id,
- BR_INCREFS, "BR_INCREFS");
- if (!ret && strong && !has_strong_ref)
- ret = binder_put_node_cmd(
- proc, thread, &ptr, node_ptr,
- node_cookie, node_debug_id,
- BR_ACQUIRE, "BR_ACQUIRE");
- if (!ret && !strong && has_strong_ref)
- ret = binder_put_node_cmd(
- proc, thread, &ptr, node_ptr,
- node_cookie, node_debug_id,
- BR_RELEASE, "BR_RELEASE");
- if (!ret && !weak && has_weak_ref)
- ret = binder_put_node_cmd(
- proc, thread, &ptr, node_ptr,
- node_cookie, node_debug_id,
- BR_DECREFS, "BR_DECREFS");
- if (orig_ptr == ptr)
- binder_debug(BINDER_DEBUG_INTERNAL_REFS,
- "%d:%d node %d u%016llx c%016llx state unchanged\n",
- proc->pid, thread->pid,
- node_debug_id,
- (u64)node_ptr,
- (u64)node_cookie);
- if (ret)
- return ret;
- } break;
- case BINDER_WORK_DEAD_BINDER:
- case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
- case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
- struct binder_ref_death *death;
- uint32_t cmd;
- binder_uintptr_t cookie;
-
- death = container_of(w, struct binder_ref_death, work);
- if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
- cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
- else
- cmd = BR_DEAD_BINDER;
- cookie = death->cookie;
-
- binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
- "%d:%d %s %016llx\n",
- proc->pid, thread->pid,
- cmd == BR_DEAD_BINDER ?
- "BR_DEAD_BINDER" :
- "BR_CLEAR_DEATH_NOTIFICATION_DONE",
- (u64)cookie);
- if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
- binder_inner_proc_unlock(proc);
- kfree(death);
- binder_stats_deleted(BINDER_STAT_DEATH);
- } else {
- binder_enqueue_work_ilocked(
- w, &proc->delivered_death);
- binder_inner_proc_unlock(proc);
- }
- if (put_user(cmd, (uint32_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(uint32_t);
- if (put_user(cookie,
- (binder_uintptr_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(binder_uintptr_t);
- binder_stat_br(proc, thread, cmd);
- if (cmd == BR_DEAD_BINDER)
- goto done; /* DEAD_BINDER notifications can cause transactions */
- } break;
- default:
- binder_inner_proc_unlock(proc);
- pr_err("%d:%d: bad work type %d\n",
- proc->pid, thread->pid, w->type);
- break;
- }
-
- if (!t)
- continue;
-
- BUG_ON(t->buffer == NULL);
- if (t->buffer->target_node) {
- struct binder_node *target_node = t->buffer->target_node;
-
- trd->target.ptr = target_node->ptr;
- trd->cookie = target_node->cookie;
- t->saved_priority = task_nice(current);
- if (t->priority < target_node->min_priority &&
- !(t->flags & TF_ONE_WAY))
- binder_set_nice(t->priority);
- else if (!(t->flags & TF_ONE_WAY) ||
- t->saved_priority > target_node->min_priority)
- binder_set_nice(target_node->min_priority);
- cmd = BR_TRANSACTION;
- } else {
- trd->target.ptr = 0;
- trd->cookie = 0;
- cmd = BR_REPLY;
- }
- trd->code = t->code;
- trd->flags = t->flags;
- trd->sender_euid = from_kuid(current_user_ns(), t->sender_euid);
-
- t_from = binder_get_txn_from(t);
- if (t_from) {
- struct task_struct *sender = t_from->proc->tsk;
-
- trd->sender_pid =
- task_tgid_nr_ns(sender,
- task_active_pid_ns(current));
- } else {
- trd->sender_pid = 0;
- }
-
- ret = binder_apply_fd_fixups(proc, t);
- if (ret) {
- struct binder_buffer *buffer = t->buffer;
- bool oneway = !!(t->flags & TF_ONE_WAY);
- int tid = t->debug_id;
-
- if (t_from)
- binder_thread_dec_tmpref(t_from);
- buffer->transaction = NULL;
- binder_cleanup_transaction(t, "fd fixups failed",
- BR_FAILED_REPLY);
- binder_free_buf(proc, thread, buffer, true);
- binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
- "%d:%d %stransaction %d fd fixups failed %d/%d, line %d\n",
- proc->pid, thread->pid,
- oneway ? "async " :
- (cmd == BR_REPLY ? "reply " : ""),
- tid, BR_FAILED_REPLY, ret, __LINE__);
- if (cmd == BR_REPLY) {
- cmd = BR_FAILED_REPLY;
- if (put_user(cmd, (uint32_t __user *)ptr))
- return -EFAULT;
- ptr += sizeof(uint32_t);
- binder_stat_br(proc, thread, cmd);
- break;
- }
- continue;
- }
- trd->data_size = t->buffer->data_size;
- trd->offsets_size = t->buffer->offsets_size;
- trd->data.ptr.buffer = (uintptr_t)t->buffer->user_data;
- trd->data.ptr.offsets = trd->data.ptr.buffer +
- ALIGN(t->buffer->data_size,
- sizeof(void *));
-
- tr.secctx = t->security_ctx;
- if (t->security_ctx) {
- cmd = BR_TRANSACTION_SEC_CTX;
- trsize = sizeof(tr);
- }
- if (put_user(cmd, (uint32_t __user *)ptr)) {
- if (t_from)
- binder_thread_dec_tmpref(t_from);
-
- binder_cleanup_transaction(t, "put_user failed",
- BR_FAILED_REPLY);
-
- return -EFAULT;
- }
- ptr += sizeof(uint32_t);
- if (copy_to_user(ptr, &tr, trsize)) {
- if (t_from)
- binder_thread_dec_tmpref(t_from);
-
- binder_cleanup_transaction(t, "copy_to_user failed",
- BR_FAILED_REPLY);
-
- return -EFAULT;
- }
- ptr += trsize;
-
- trace_binder_transaction_received(t);
- binder_stat_br(proc, thread, cmd);
- binder_debug(BINDER_DEBUG_TRANSACTION,
- "%d:%d %s %d %d:%d, cmd %u size %zd-%zd ptr %016llx-%016llx\n",
- proc->pid, thread->pid,
- (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
- (cmd == BR_TRANSACTION_SEC_CTX) ?
- "BR_TRANSACTION_SEC_CTX" : "BR_REPLY",
- t->debug_id, t_from ? t_from->proc->pid : 0,
- t_from ? t_from->pid : 0, cmd,
- t->buffer->data_size, t->buffer->offsets_size,
- (u64)trd->data.ptr.buffer,
- (u64)trd->data.ptr.offsets);
-
- if (t_from)
- binder_thread_dec_tmpref(t_from);
- t->buffer->allow_user_free = 1;
- if (cmd != BR_REPLY && !(t->flags & TF_ONE_WAY)) {
- binder_inner_proc_lock(thread->proc);
- t->to_parent = thread->transaction_stack;
- t->to_thread = thread;
- thread->transaction_stack = t;
- binder_inner_proc_unlock(thread->proc);
- } else {
- binder_free_transaction(t);
- }
- break;
- }
-
-done:
-
- *consumed = ptr - buffer;
- binder_inner_proc_lock(proc);
- if (proc->requested_threads == 0 &&
- list_empty(&thread->proc->waiting_threads) &&
- proc->requested_threads_started < proc->max_threads &&
- (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
- BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
- /*spawn a new thread if we leave this out */) {
- proc->requested_threads++;
- binder_inner_proc_unlock(proc);
- binder_debug(BINDER_DEBUG_THREADS,
- "%d:%d BR_SPAWN_LOOPER\n",
- proc->pid, thread->pid);
- if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
- return -EFAULT;
- binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
- } else
- binder_inner_proc_unlock(proc);
- return 0;
-}
-
-static void binder_release_work(struct binder_proc *proc,
- struct list_head *list)
-{
- struct binder_work *w;
- enum binder_work_type wtype;
-
- while (1) {
- binder_inner_proc_lock(proc);
- w = binder_dequeue_work_head_ilocked(list);
- wtype = w ? w->type : 0;
- binder_inner_proc_unlock(proc);
- if (!w)
- return;
-
- switch (wtype) {
- case BINDER_WORK_TRANSACTION: {
- struct binder_transaction *t;
-
- t = container_of(w, struct binder_transaction, work);
-
- binder_cleanup_transaction(t, "process died.",
- BR_DEAD_REPLY);
- } break;
- case BINDER_WORK_RETURN_ERROR: {
- struct binder_error *e = container_of(
- w, struct binder_error, work);
-
- binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
- "undelivered TRANSACTION_ERROR: %u\n",
- e->cmd);
- } break;
- case BINDER_WORK_TRANSACTION_PENDING:
- case BINDER_WORK_TRANSACTION_ONEWAY_SPAM_SUSPECT:
- case BINDER_WORK_TRANSACTION_COMPLETE: {
- binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
- "undelivered TRANSACTION_COMPLETE\n");
- kfree(w);
- binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
- } break;
- case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
- case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
- struct binder_ref_death *death;
-
- death = container_of(w, struct binder_ref_death, work);
- binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
- "undelivered death notification, %016llx\n",
- (u64)death->cookie);
- kfree(death);
- binder_stats_deleted(BINDER_STAT_DEATH);
- } break;
- case BINDER_WORK_NODE:
- break;
- default:
- pr_err("unexpected work type, %d, not freed\n",
- wtype);
- break;
- }
- }
-
-}
-
-static struct binder_thread *binder_get_thread_ilocked(
- struct binder_proc *proc, struct binder_thread *new_thread)
-{
- struct binder_thread *thread = NULL;
- struct rb_node *parent = NULL;
- struct rb_node **p = &proc->threads.rb_node;
-
- while (*p) {
- parent = *p;
- thread = rb_entry(parent, struct binder_thread, rb_node);
-
- if (current->pid < thread->pid)
- p = &(*p)->rb_left;
- else if (current->pid > thread->pid)
- p = &(*p)->rb_right;
- else
- return thread;
- }
- if (!new_thread)
- return NULL;
- thread = new_thread;
- binder_stats_created(BINDER_STAT_THREAD);
- thread->proc = proc;
- thread->pid = current->pid;
- atomic_set(&thread->tmp_ref, 0);
- init_waitqueue_head(&thread->wait);
- INIT_LIST_HEAD(&thread->todo);
- rb_link_node(&thread->rb_node, parent, p);
- rb_insert_color(&thread->rb_node, &proc->threads);
- thread->looper_need_return = true;
- thread->return_error.work.type = BINDER_WORK_RETURN_ERROR;
- thread->return_error.cmd = BR_OK;
- thread->reply_error.work.type = BINDER_WORK_RETURN_ERROR;
- thread->reply_error.cmd = BR_OK;
- thread->ee.command = BR_OK;
- INIT_LIST_HEAD(&new_thread->waiting_thread_node);
- return thread;
-}
-
-static struct binder_thread *binder_get_thread(struct binder_proc *proc)
-{
- struct binder_thread *thread;
- struct binder_thread *new_thread;
-
- binder_inner_proc_lock(proc);
- thread = binder_get_thread_ilocked(proc, NULL);
- binder_inner_proc_unlock(proc);
- if (!thread) {
- new_thread = kzalloc(sizeof(*thread), GFP_KERNEL);
- if (new_thread == NULL)
- return NULL;
- binder_inner_proc_lock(proc);
- thread = binder_get_thread_ilocked(proc, new_thread);
- binder_inner_proc_unlock(proc);
- if (thread != new_thread)
- kfree(new_thread);
- }
- return thread;
-}
-
-static void binder_free_proc(struct binder_proc *proc)
-{
- struct binder_device *device;
-
- BUG_ON(!list_empty(&proc->todo));
- BUG_ON(!list_empty(&proc->delivered_death));
- if (proc->outstanding_txns)
- pr_warn("%s: Unexpected outstanding_txns %d\n",
- __func__, proc->outstanding_txns);
- device = container_of(proc->context, struct binder_device, context);
- if (refcount_dec_and_test(&device->ref)) {
- kfree(proc->context->name);
- kfree(device);
- }
- binder_alloc_deferred_release(&proc->alloc);
- put_task_struct(proc->tsk);
- put_cred(proc->cred);
- binder_stats_deleted(BINDER_STAT_PROC);
- kfree(proc);
-}
-
-static void binder_free_thread(struct binder_thread *thread)
-{
- BUG_ON(!list_empty(&thread->todo));
- binder_stats_deleted(BINDER_STAT_THREAD);
- binder_proc_dec_tmpref(thread->proc);
- kfree(thread);
-}
-
-static int binder_thread_release(struct binder_proc *proc,
- struct binder_thread *thread)
-{
- struct binder_transaction *t;
- struct binder_transaction *send_reply = NULL;
- int active_transactions = 0;
- struct binder_transaction *last_t = NULL;
-
- binder_inner_proc_lock(thread->proc);
- /*
- * take a ref on the proc so it survives
- * after we remove this thread from proc->threads.
- * The corresponding dec is when we actually
- * free the thread in binder_free_thread()
- */
- proc->tmp_ref++;
- /*
- * take a ref on this thread to ensure it
- * survives while we are releasing it
- */
- atomic_inc(&thread->tmp_ref);
- rb_erase(&thread->rb_node, &proc->threads);
- t = thread->transaction_stack;
- if (t) {
- spin_lock(&t->lock);
- if (t->to_thread == thread)
- send_reply = t;
- } else {
- __acquire(&t->lock);
- }
- thread->is_dead = true;
-
- while (t) {
- last_t = t;
- active_transactions++;
- binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
- "release %d:%d transaction %d %s, still active\n",
- proc->pid, thread->pid,
- t->debug_id,
- (t->to_thread == thread) ? "in" : "out");
-
- if (t->to_thread == thread) {
- thread->proc->outstanding_txns--;
- t->to_proc = NULL;
- t->to_thread = NULL;
- if (t->buffer) {
- t->buffer->transaction = NULL;
- t->buffer = NULL;
- }
- t = t->to_parent;
- } else if (t->from == thread) {
- t->from = NULL;
- t = t->from_parent;
- } else
- BUG();
- spin_unlock(&last_t->lock);
- if (t)
- spin_lock(&t->lock);
- else
- __acquire(&t->lock);
- }
- /* annotation for sparse, lock not acquired in last iteration above */
- __release(&t->lock);
-
- /*
- * If this thread used poll, make sure we remove the waitqueue from any
- * poll data structures holding it.
- */
- if (thread->looper & BINDER_LOOPER_STATE_POLL)
- wake_up_pollfree(&thread->wait);
-
- binder_inner_proc_unlock(thread->proc);
-
- /*
- * This is needed to avoid races between wake_up_pollfree() above and
- * someone else removing the last entry from the queue for other reasons
- * (e.g. ep_remove_wait_queue() being called due to an epoll file
- * descriptor being closed). Such other users hold an RCU read lock, so
- * we can be sure they're done after we call synchronize_rcu().
- */
- if (thread->looper & BINDER_LOOPER_STATE_POLL)
- synchronize_rcu();
-
- if (send_reply)
- binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
- binder_release_work(proc, &thread->todo);
- binder_thread_dec_tmpref(thread);
- return active_transactions;
-}
-
-static __poll_t binder_poll(struct file *filp,
- struct poll_table_struct *wait)
-{
- struct binder_proc *proc = filp->private_data;
- struct binder_thread *thread = NULL;
- bool wait_for_proc_work;
-
- thread = binder_get_thread(proc);
- if (!thread)
- return POLLERR;
-
- binder_inner_proc_lock(thread->proc);
- thread->looper |= BINDER_LOOPER_STATE_POLL;
- wait_for_proc_work = binder_available_for_proc_work_ilocked(thread);
-
- binder_inner_proc_unlock(thread->proc);
-
- poll_wait(filp, &thread->wait, wait);
-
- if (binder_has_work(thread, wait_for_proc_work))
- return EPOLLIN;
-
- return 0;
-}
-
-static int binder_ioctl_write_read(struct file *filp, unsigned long arg,
- struct binder_thread *thread)
-{
- int ret = 0;
- struct binder_proc *proc = filp->private_data;
- void __user *ubuf = (void __user *)arg;
- struct binder_write_read bwr;
-
- if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
- ret = -EFAULT;
- goto out;
- }
- binder_debug(BINDER_DEBUG_READ_WRITE,
- "%d:%d write %lld at %016llx, read %lld at %016llx\n",
- proc->pid, thread->pid,
- (u64)bwr.write_size, (u64)bwr.write_buffer,
- (u64)bwr.read_size, (u64)bwr.read_buffer);
-
- if (bwr.write_size > 0) {
- ret = binder_thread_write(proc, thread,
- bwr.write_buffer,
- bwr.write_size,
- &bwr.write_consumed);
- trace_binder_write_done(ret);
- if (ret < 0) {
- bwr.read_consumed = 0;
- if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
- ret = -EFAULT;
- goto out;
- }
- }
- if (bwr.read_size > 0) {
- ret = binder_thread_read(proc, thread, bwr.read_buffer,
- bwr.read_size,
- &bwr.read_consumed,
- filp->f_flags & O_NONBLOCK);
- trace_binder_read_done(ret);
- binder_inner_proc_lock(proc);
- if (!binder_worklist_empty_ilocked(&proc->todo))
- binder_wakeup_proc_ilocked(proc);
- binder_inner_proc_unlock(proc);
- if (ret < 0) {
- if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
- ret = -EFAULT;
- goto out;
- }
- }
- binder_debug(BINDER_DEBUG_READ_WRITE,
- "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
- proc->pid, thread->pid,
- (u64)bwr.write_consumed, (u64)bwr.write_size,
- (u64)bwr.read_consumed, (u64)bwr.read_size);
- if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
- ret = -EFAULT;
- goto out;
- }
-out:
- return ret;
-}
-
-static int binder_ioctl_set_ctx_mgr(struct file *filp,
- struct flat_binder_object *fbo)
-{
- int ret = 0;
- struct binder_proc *proc = filp->private_data;
- struct binder_context *context = proc->context;
- struct binder_node *new_node;
- kuid_t curr_euid = current_euid();
-
- mutex_lock(&context->context_mgr_node_lock);
- if (context->binder_context_mgr_node) {
- pr_err("BINDER_SET_CONTEXT_MGR already set\n");
- ret = -EBUSY;
- goto out;
- }
- ret = security_binder_set_context_mgr(proc->cred);
- if (ret < 0)
- goto out;
- if (uid_valid(context->binder_context_mgr_uid)) {
- if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) {
- pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
- from_kuid(&init_user_ns, curr_euid),
- from_kuid(&init_user_ns,
- context->binder_context_mgr_uid));
- ret = -EPERM;
- goto out;
- }
- } else {
- context->binder_context_mgr_uid = curr_euid;
- }
- new_node = binder_new_node(proc, fbo);
- if (!new_node) {
- ret = -ENOMEM;
- goto out;
- }
- binder_node_lock(new_node);
- new_node->local_weak_refs++;
- new_node->local_strong_refs++;
- new_node->has_strong_ref = 1;
- new_node->has_weak_ref = 1;
- context->binder_context_mgr_node = new_node;
- binder_node_unlock(new_node);
- binder_put_node(new_node);
-out:
- mutex_unlock(&context->context_mgr_node_lock);
- return ret;
-}
-
-static int binder_ioctl_get_node_info_for_ref(struct binder_proc *proc,
- struct binder_node_info_for_ref *info)
-{
- struct binder_node *node;
- struct binder_context *context = proc->context;
- __u32 handle = info->handle;
-
- if (info->strong_count || info->weak_count || info->reserved1 ||
- info->reserved2 || info->reserved3) {
- binder_user_error("%d BINDER_GET_NODE_INFO_FOR_REF: only handle may be non-zero.",
- proc->pid);
- return -EINVAL;
- }
-
- /* This ioctl may only be used by the context manager */
- mutex_lock(&context->context_mgr_node_lock);
- if (!context->binder_context_mgr_node ||
- context->binder_context_mgr_node->proc != proc) {
- mutex_unlock(&context->context_mgr_node_lock);
- return -EPERM;
- }
- mutex_unlock(&context->context_mgr_node_lock);
-
- node = binder_get_node_from_ref(proc, handle, true, NULL);
- if (!node)
- return -EINVAL;
-
- info->strong_count = node->local_strong_refs +
- node->internal_strong_refs;
- info->weak_count = node->local_weak_refs;
-
- binder_put_node(node);
-
- return 0;
-}
-
-static int binder_ioctl_get_node_debug_info(struct binder_proc *proc,
- struct binder_node_debug_info *info)
-{
- struct rb_node *n;
- binder_uintptr_t ptr = info->ptr;
-
- memset(info, 0, sizeof(*info));
-
- binder_inner_proc_lock(proc);
- for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
- struct binder_node *node = rb_entry(n, struct binder_node,
- rb_node);
- if (node->ptr > ptr) {
- info->ptr = node->ptr;
- info->cookie = node->cookie;
- info->has_strong_ref = node->has_strong_ref;
- info->has_weak_ref = node->has_weak_ref;
- break;
- }
- }
- binder_inner_proc_unlock(proc);
-
- return 0;
-}
-
-static bool binder_txns_pending_ilocked(struct binder_proc *proc)
-{
- struct rb_node *n;
- struct binder_thread *thread;
-
- if (proc->outstanding_txns > 0)
- return true;
-
- for (n = rb_first(&proc->threads); n; n = rb_next(n)) {
- thread = rb_entry(n, struct binder_thread, rb_node);
- if (thread->transaction_stack)
- return true;
- }
- return false;
-}
-
-static int binder_ioctl_freeze(struct binder_freeze_info *info,
- struct binder_proc *target_proc)
-{
- int ret = 0;
-
- if (!info->enable) {
- binder_inner_proc_lock(target_proc);
- target_proc->sync_recv = false;
- target_proc->async_recv = false;
- target_proc->is_frozen = false;
- binder_inner_proc_unlock(target_proc);
- return 0;
- }
-
- /*
- * Freezing the target. Prevent new transactions by
- * setting frozen state. If timeout specified, wait
- * for transactions to drain.
- */
- binder_inner_proc_lock(target_proc);
- target_proc->sync_recv = false;
- target_proc->async_recv = false;
- target_proc->is_frozen = true;
- binder_inner_proc_unlock(target_proc);
-
- if (info->timeout_ms > 0)
- ret = wait_event_interruptible_timeout(
- target_proc->freeze_wait,
- (!target_proc->outstanding_txns),
- msecs_to_jiffies(info->timeout_ms));
-
- /* Check pending transactions that wait for reply */
- if (ret >= 0) {
- binder_inner_proc_lock(target_proc);
- if (binder_txns_pending_ilocked(target_proc))
- ret = -EAGAIN;
- binder_inner_proc_unlock(target_proc);
- }
-
- if (ret < 0) {
- binder_inner_proc_lock(target_proc);
- target_proc->is_frozen = false;
- binder_inner_proc_unlock(target_proc);
- }
-
- return ret;
-}
-
-static int binder_ioctl_get_freezer_info(
- struct binder_frozen_status_info *info)
-{
- struct binder_proc *target_proc;
- bool found = false;
- __u32 txns_pending;
-
- info->sync_recv = 0;
- info->async_recv = 0;
-
- mutex_lock(&binder_procs_lock);
- hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
- if (target_proc->pid == info->pid) {
- found = true;
- binder_inner_proc_lock(target_proc);
- txns_pending = binder_txns_pending_ilocked(target_proc);
- info->sync_recv |= target_proc->sync_recv |
- (txns_pending << 1);
- info->async_recv |= target_proc->async_recv;
- binder_inner_proc_unlock(target_proc);
- }
- }
- mutex_unlock(&binder_procs_lock);
-
- if (!found)
- return -EINVAL;
-
- return 0;
-}
-
-static int binder_ioctl_get_extended_error(struct binder_thread *thread,
- void __user *ubuf)
-{
- struct binder_extended_error ee;
-
- binder_inner_proc_lock(thread->proc);
- ee = thread->ee;
- binder_set_extended_error(&thread->ee, 0, BR_OK, 0);
- binder_inner_proc_unlock(thread->proc);
-
- if (copy_to_user(ubuf, &ee, sizeof(ee)))
- return -EFAULT;
-
- return 0;
-}
-
-static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
- int ret;
- struct binder_proc *proc = filp->private_data;
- struct binder_thread *thread;
- void __user *ubuf = (void __user *)arg;
-
- /*pr_info("binder_ioctl: %d:%d %x %lx\n",
- proc->pid, current->pid, cmd, arg);*/
-
- binder_selftest_alloc(&proc->alloc);
-
- trace_binder_ioctl(cmd, arg);
-
- ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
- if (ret)
- goto err_unlocked;
-
- thread = binder_get_thread(proc);
- if (thread == NULL) {
- ret = -ENOMEM;
- goto err;
- }
-
- switch (cmd) {
- case BINDER_WRITE_READ:
- ret = binder_ioctl_write_read(filp, arg, thread);
- if (ret)
- goto err;
- break;
- case BINDER_SET_MAX_THREADS: {
- int max_threads;
-
- if (copy_from_user(&max_threads, ubuf,
- sizeof(max_threads))) {
- ret = -EINVAL;
- goto err;
- }
- binder_inner_proc_lock(proc);
- proc->max_threads = max_threads;
- binder_inner_proc_unlock(proc);
- break;
- }
- case BINDER_SET_CONTEXT_MGR_EXT: {
- struct flat_binder_object fbo;
-
- if (copy_from_user(&fbo, ubuf, sizeof(fbo))) {
- ret = -EINVAL;
- goto err;
- }
- ret = binder_ioctl_set_ctx_mgr(filp, &fbo);
- if (ret)
- goto err;
- break;
- }
- case BINDER_SET_CONTEXT_MGR:
- ret = binder_ioctl_set_ctx_mgr(filp, NULL);
- if (ret)
- goto err;
- break;
- case BINDER_THREAD_EXIT:
- binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
- proc->pid, thread->pid);
- binder_thread_release(proc, thread);
- thread = NULL;
- break;
- case BINDER_VERSION: {
- struct binder_version __user *ver = ubuf;
-
- if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
- &ver->protocol_version)) {
- ret = -EINVAL;
- goto err;
- }
- break;
- }
- case BINDER_GET_NODE_INFO_FOR_REF: {
- struct binder_node_info_for_ref info;
-
- if (copy_from_user(&info, ubuf, sizeof(info))) {
- ret = -EFAULT;
- goto err;
- }
-
- ret = binder_ioctl_get_node_info_for_ref(proc, &info);
- if (ret < 0)
- goto err;
-
- if (copy_to_user(ubuf, &info, sizeof(info))) {
- ret = -EFAULT;
- goto err;
- }
-
- break;
- }
- case BINDER_GET_NODE_DEBUG_INFO: {
- struct binder_node_debug_info info;
-
- if (copy_from_user(&info, ubuf, sizeof(info))) {
- ret = -EFAULT;
- goto err;
- }
-
- ret = binder_ioctl_get_node_debug_info(proc, &info);
- if (ret < 0)
- goto err;
-
- if (copy_to_user(ubuf, &info, sizeof(info))) {
- ret = -EFAULT;
- goto err;
- }
- break;
- }
- case BINDER_FREEZE: {
- struct binder_freeze_info info;
- struct binder_proc **target_procs = NULL, *target_proc;
- int target_procs_count = 0, i = 0;
-
- ret = 0;
-
- if (copy_from_user(&info, ubuf, sizeof(info))) {
- ret = -EFAULT;
- goto err;
- }
-
- mutex_lock(&binder_procs_lock);
- hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
- if (target_proc->pid == info.pid)
- target_procs_count++;
- }
-
- if (target_procs_count == 0) {
- mutex_unlock(&binder_procs_lock);
- ret = -EINVAL;
- goto err;
- }
-
- target_procs = kcalloc(target_procs_count,
- sizeof(struct binder_proc *),
- GFP_KERNEL);
-
- if (!target_procs) {
- mutex_unlock(&binder_procs_lock);
- ret = -ENOMEM;
- goto err;
- }
-
- hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
- if (target_proc->pid != info.pid)
- continue;
-
- binder_inner_proc_lock(target_proc);
- target_proc->tmp_ref++;
- binder_inner_proc_unlock(target_proc);
-
- target_procs[i++] = target_proc;
- }
- mutex_unlock(&binder_procs_lock);
-
- for (i = 0; i < target_procs_count; i++) {
- if (ret >= 0)
- ret = binder_ioctl_freeze(&info,
- target_procs[i]);
-
- binder_proc_dec_tmpref(target_procs[i]);
- }
-
- kfree(target_procs);
-
- if (ret < 0)
- goto err;
- break;
- }
- case BINDER_GET_FROZEN_INFO: {
- struct binder_frozen_status_info info;
-
- if (copy_from_user(&info, ubuf, sizeof(info))) {
- ret = -EFAULT;
- goto err;
- }
-
- ret = binder_ioctl_get_freezer_info(&info);
- if (ret < 0)
- goto err;
-
- if (copy_to_user(ubuf, &info, sizeof(info))) {
- ret = -EFAULT;
- goto err;
- }
- break;
- }
- case BINDER_ENABLE_ONEWAY_SPAM_DETECTION: {
- uint32_t enable;
-
- if (copy_from_user(&enable, ubuf, sizeof(enable))) {
- ret = -EFAULT;
- goto err;
- }
- binder_inner_proc_lock(proc);
- proc->oneway_spam_detection_enabled = (bool)enable;
- binder_inner_proc_unlock(proc);
- break;
- }
- case BINDER_GET_EXTENDED_ERROR:
- ret = binder_ioctl_get_extended_error(thread, ubuf);
- if (ret < 0)
- goto err;
- break;
- default:
- ret = -EINVAL;
- goto err;
- }
- ret = 0;
-err:
- if (thread)
- thread->looper_need_return = false;
- wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
- if (ret && ret != -EINTR)
- pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
-err_unlocked:
- trace_binder_ioctl_done(ret);
- return ret;
-}
-
-static void binder_vma_open(struct vm_area_struct *vma)
-{
- struct binder_proc *proc = vma->vm_private_data;
-
- binder_debug(BINDER_DEBUG_OPEN_CLOSE,
- "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
- proc->pid, vma->vm_start, vma->vm_end,
- (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
- (unsigned long)pgprot_val(vma->vm_page_prot));
-}
-
-static void binder_vma_close(struct vm_area_struct *vma)
-{
- struct binder_proc *proc = vma->vm_private_data;
-
- binder_debug(BINDER_DEBUG_OPEN_CLOSE,
- "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
- proc->pid, vma->vm_start, vma->vm_end,
- (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
- (unsigned long)pgprot_val(vma->vm_page_prot));
- binder_alloc_vma_close(&proc->alloc);
-}
-
-static vm_fault_t binder_vm_fault(struct vm_fault *vmf)
-{
- return VM_FAULT_SIGBUS;
-}
-
-static const struct vm_operations_struct binder_vm_ops = {
- .open = binder_vma_open,
- .close = binder_vma_close,
- .fault = binder_vm_fault,
-};
-
-static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
-{
- struct binder_proc *proc = filp->private_data;
-
- if (proc->tsk != current->group_leader)
- return -EINVAL;
-
- binder_debug(BINDER_DEBUG_OPEN_CLOSE,
- "%s: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
- __func__, proc->pid, vma->vm_start, vma->vm_end,
- (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
- (unsigned long)pgprot_val(vma->vm_page_prot));
-
- if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
- pr_err("%s: %d %lx-%lx %s failed %d\n", __func__,
- proc->pid, vma->vm_start, vma->vm_end, "bad vm_flags", -EPERM);
- return -EPERM;
- }
- vm_flags_mod(vma, VM_DONTCOPY | VM_MIXEDMAP, VM_MAYWRITE);
-
- vma->vm_ops = &binder_vm_ops;
- vma->vm_private_data = proc;
-
- return binder_alloc_mmap_handler(&proc->alloc, vma);
-}
-
-static int binder_open(struct inode *nodp, struct file *filp)
-{
- struct binder_proc *proc, *itr;
- struct binder_device *binder_dev;
- struct binderfs_info *info;
- struct dentry *binder_binderfs_dir_entry_proc = NULL;
- bool existing_pid = false;
-
- binder_debug(BINDER_DEBUG_OPEN_CLOSE, "%s: %d:%d\n", __func__,
- current->group_leader->pid, current->pid);
-
- proc = kzalloc(sizeof(*proc), GFP_KERNEL);
- if (proc == NULL)
- return -ENOMEM;
- spin_lock_init(&proc->inner_lock);
- spin_lock_init(&proc->outer_lock);
- get_task_struct(current->group_leader);
- proc->tsk = current->group_leader;
- proc->cred = get_cred(filp->f_cred);
- INIT_LIST_HEAD(&proc->todo);
- init_waitqueue_head(&proc->freeze_wait);
- proc->default_priority = task_nice(current);
- /* binderfs stashes devices in i_private */
- if (is_binderfs_device(nodp)) {
- binder_dev = nodp->i_private;
- info = nodp->i_sb->s_fs_info;
- binder_binderfs_dir_entry_proc = info->proc_log_dir;
- } else {
- binder_dev = container_of(filp->private_data,
- struct binder_device, miscdev);
- }
- refcount_inc(&binder_dev->ref);
- proc->context = &binder_dev->context;
- binder_alloc_init(&proc->alloc);
-
- binder_stats_created(BINDER_STAT_PROC);
- proc->pid = current->group_leader->pid;
- INIT_LIST_HEAD(&proc->delivered_death);
- INIT_LIST_HEAD(&proc->waiting_threads);
- filp->private_data = proc;
-
- mutex_lock(&binder_procs_lock);
- hlist_for_each_entry(itr, &binder_procs, proc_node) {
- if (itr->pid == proc->pid) {
- existing_pid = true;
- break;
- }
- }
- hlist_add_head(&proc->proc_node, &binder_procs);
- mutex_unlock(&binder_procs_lock);
-
- if (binder_debugfs_dir_entry_proc && !existing_pid) {
- char strbuf[11];
-
- snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
- /*
- * proc debug entries are shared between contexts.
- * Only create for the first PID to avoid debugfs log spamming
- * The printing code will anyway print all contexts for a given
- * PID so this is not a problem.
- */
- proc->debugfs_entry = debugfs_create_file(strbuf, 0444,
- binder_debugfs_dir_entry_proc,
- (void *)(unsigned long)proc->pid,
- &proc_fops);
- }
-
- if (binder_binderfs_dir_entry_proc && !existing_pid) {
- char strbuf[11];
- struct dentry *binderfs_entry;
-
- snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
- /*
- * Similar to debugfs, the process specific log file is shared
- * between contexts. Only create for the first PID.
- * This is ok since same as debugfs, the log file will contain
- * information on all contexts of a given PID.
- */
- binderfs_entry = binderfs_create_file(binder_binderfs_dir_entry_proc,
- strbuf, &proc_fops, (void *)(unsigned long)proc->pid);
- if (!IS_ERR(binderfs_entry)) {
- proc->binderfs_entry = binderfs_entry;
- } else {
- int error;
-
- error = PTR_ERR(binderfs_entry);
- pr_warn("Unable to create file %s in binderfs (error %d)\n",
- strbuf, error);
- }
- }
-
- return 0;
-}
-
-static int binder_flush(struct file *filp, fl_owner_t id)
-{
- struct binder_proc *proc = filp->private_data;
-
- binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
-
- return 0;
-}
-
-static void binder_deferred_flush(struct binder_proc *proc)
-{
- struct rb_node *n;
- int wake_count = 0;
-
- binder_inner_proc_lock(proc);
- for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
- struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
-
- thread->looper_need_return = true;
- if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
- wake_up_interruptible(&thread->wait);
- wake_count++;
- }
- }
- binder_inner_proc_unlock(proc);
-
- binder_debug(BINDER_DEBUG_OPEN_CLOSE,
- "binder_flush: %d woke %d threads\n", proc->pid,
- wake_count);
-}
-
-static int binder_release(struct inode *nodp, struct file *filp)
-{
- struct binder_proc *proc = filp->private_data;
-
- debugfs_remove(proc->debugfs_entry);
-
- if (proc->binderfs_entry) {
- binderfs_remove_file(proc->binderfs_entry);
- proc->binderfs_entry = NULL;
- }
-
- binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
-
- return 0;
-}
-
-static int binder_node_release(struct binder_node *node, int refs)
-{
- struct binder_ref *ref;
- int death = 0;
- struct binder_proc *proc = node->proc;
-
- binder_release_work(proc, &node->async_todo);
-
- binder_node_lock(node);
- binder_inner_proc_lock(proc);
- binder_dequeue_work_ilocked(&node->work);
- /*
- * The caller must have taken a temporary ref on the node,
- */
- BUG_ON(!node->tmp_refs);
- if (hlist_empty(&node->refs) && node->tmp_refs == 1) {
- binder_inner_proc_unlock(proc);
- binder_node_unlock(node);
- binder_free_node(node);
-
- return refs;
- }
-
- node->proc = NULL;
- node->local_strong_refs = 0;
- node->local_weak_refs = 0;
- binder_inner_proc_unlock(proc);
-
- spin_lock(&binder_dead_nodes_lock);
- hlist_add_head(&node->dead_node, &binder_dead_nodes);
- spin_unlock(&binder_dead_nodes_lock);
-
- hlist_for_each_entry(ref, &node->refs, node_entry) {
- refs++;
- /*
- * Need the node lock to synchronize
- * with new notification requests and the
- * inner lock to synchronize with queued
- * death notifications.
- */
- binder_inner_proc_lock(ref->proc);
- if (!ref->death) {
- binder_inner_proc_unlock(ref->proc);
- continue;
- }
-
- death++;
-
- BUG_ON(!list_empty(&ref->death->work.entry));
- ref->death->work.type = BINDER_WORK_DEAD_BINDER;
- binder_enqueue_work_ilocked(&ref->death->work,
- &ref->proc->todo);
- binder_wakeup_proc_ilocked(ref->proc);
- binder_inner_proc_unlock(ref->proc);
- }
-
- binder_debug(BINDER_DEBUG_DEAD_BINDER,
- "node %d now dead, refs %d, death %d\n",
- node->debug_id, refs, death);
- binder_node_unlock(node);
- binder_put_node(node);
-
- return refs;
-}
-
-static void binder_deferred_release(struct binder_proc *proc)
-{
- struct binder_context *context = proc->context;
- struct rb_node *n;
- int threads, nodes, incoming_refs, outgoing_refs, active_transactions;
-
- mutex_lock(&binder_procs_lock);
- hlist_del(&proc->proc_node);
- mutex_unlock(&binder_procs_lock);
-
- mutex_lock(&context->context_mgr_node_lock);
- if (context->binder_context_mgr_node &&
- context->binder_context_mgr_node->proc == proc) {
- binder_debug(BINDER_DEBUG_DEAD_BINDER,
- "%s: %d context_mgr_node gone\n",
- __func__, proc->pid);
- context->binder_context_mgr_node = NULL;
- }
- mutex_unlock(&context->context_mgr_node_lock);
- binder_inner_proc_lock(proc);
- /*
- * Make sure proc stays alive after we
- * remove all the threads
- */
- proc->tmp_ref++;
-
- proc->is_dead = true;
- proc->is_frozen = false;
- proc->sync_recv = false;
- proc->async_recv = false;
- threads = 0;
- active_transactions = 0;
- while ((n = rb_first(&proc->threads))) {
- struct binder_thread *thread;
-
- thread = rb_entry(n, struct binder_thread, rb_node);
- binder_inner_proc_unlock(proc);
- threads++;
- active_transactions += binder_thread_release(proc, thread);
- binder_inner_proc_lock(proc);
- }
-
- nodes = 0;
- incoming_refs = 0;
- while ((n = rb_first(&proc->nodes))) {
- struct binder_node *node;
-
- node = rb_entry(n, struct binder_node, rb_node);
- nodes++;
- /*
- * take a temporary ref on the node before
- * calling binder_node_release() which will either
- * kfree() the node or call binder_put_node()
- */
- binder_inc_node_tmpref_ilocked(node);
- rb_erase(&node->rb_node, &proc->nodes);
- binder_inner_proc_unlock(proc);
- incoming_refs = binder_node_release(node, incoming_refs);
- binder_inner_proc_lock(proc);
- }
- binder_inner_proc_unlock(proc);
-
- outgoing_refs = 0;
- binder_proc_lock(proc);
- while ((n = rb_first(&proc->refs_by_desc))) {
- struct binder_ref *ref;
-
- ref = rb_entry(n, struct binder_ref, rb_node_desc);
- outgoing_refs++;
- binder_cleanup_ref_olocked(ref);
- binder_proc_unlock(proc);
- binder_free_ref(ref);
- binder_proc_lock(proc);
- }
- binder_proc_unlock(proc);
-
- binder_release_work(proc, &proc->todo);
- binder_release_work(proc, &proc->delivered_death);
-
- binder_debug(BINDER_DEBUG_OPEN_CLOSE,
- "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d\n",
- __func__, proc->pid, threads, nodes, incoming_refs,
- outgoing_refs, active_transactions);
-
- binder_proc_dec_tmpref(proc);
-}
-
-static void binder_deferred_func(struct work_struct *work)
-{
- struct binder_proc *proc;
-
- int defer;
-
- do {
- mutex_lock(&binder_deferred_lock);
- if (!hlist_empty(&binder_deferred_list)) {
- proc = hlist_entry(binder_deferred_list.first,
- struct binder_proc, deferred_work_node);
- hlist_del_init(&proc->deferred_work_node);
- defer = proc->deferred_work;
- proc->deferred_work = 0;
- } else {
- proc = NULL;
- defer = 0;
- }
- mutex_unlock(&binder_deferred_lock);
-
- if (defer & BINDER_DEFERRED_FLUSH)
- binder_deferred_flush(proc);
-
- if (defer & BINDER_DEFERRED_RELEASE)
- binder_deferred_release(proc); /* frees proc */
- } while (proc);
-}
-static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
-
-static void
-binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
-{
- mutex_lock(&binder_deferred_lock);
- proc->deferred_work |= defer;
- if (hlist_unhashed(&proc->deferred_work_node)) {
- hlist_add_head(&proc->deferred_work_node,
- &binder_deferred_list);
- schedule_work(&binder_deferred_work);
- }
- mutex_unlock(&binder_deferred_lock);
-}
-
-static void print_binder_transaction_ilocked(struct seq_file *m,
- struct binder_proc *proc,
- const char *prefix,
- struct binder_transaction *t)
-{
- struct binder_proc *to_proc;
- struct binder_buffer *buffer = t->buffer;
- ktime_t current_time = ktime_get();
-
- spin_lock(&t->lock);
- to_proc = t->to_proc;
- seq_printf(m,
- "%s %d: %pK from %d:%d to %d:%d code %x flags %x pri %ld r%d elapsed %lldms",
- prefix, t->debug_id, t,
- t->from_pid,
- t->from_tid,
- to_proc ? to_proc->pid : 0,
- t->to_thread ? t->to_thread->pid : 0,
- t->code, t->flags, t->priority, t->need_reply,
- ktime_ms_delta(current_time, t->start_time));
- spin_unlock(&t->lock);
-
- if (proc != to_proc) {
- /*
- * Can only safely deref buffer if we are holding the
- * correct proc inner lock for this node
- */
- seq_puts(m, "\n");
- return;
- }
-
- if (buffer == NULL) {
- seq_puts(m, " buffer free\n");
- return;
- }
- if (buffer->target_node)
- seq_printf(m, " node %d", buffer->target_node->debug_id);
- seq_printf(m, " size %zd:%zd data %pK\n",
- buffer->data_size, buffer->offsets_size,
- buffer->user_data);
-}
-
-static void print_binder_work_ilocked(struct seq_file *m,
- struct binder_proc *proc,
- const char *prefix,
- const char *transaction_prefix,
- struct binder_work *w)
-{
- struct binder_node *node;
- struct binder_transaction *t;
-
- switch (w->type) {
- case BINDER_WORK_TRANSACTION:
- t = container_of(w, struct binder_transaction, work);
- print_binder_transaction_ilocked(
- m, proc, transaction_prefix, t);
- break;
- case BINDER_WORK_RETURN_ERROR: {
- struct binder_error *e = container_of(
- w, struct binder_error, work);
-
- seq_printf(m, "%stransaction error: %u\n",
- prefix, e->cmd);
- } break;
- case BINDER_WORK_TRANSACTION_COMPLETE:
- seq_printf(m, "%stransaction complete\n", prefix);
- break;
- case BINDER_WORK_NODE:
- node = container_of(w, struct binder_node, work);
- seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
- prefix, node->debug_id,
- (u64)node->ptr, (u64)node->cookie);
- break;
- case BINDER_WORK_DEAD_BINDER:
- seq_printf(m, "%shas dead binder\n", prefix);
- break;
- case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
- seq_printf(m, "%shas cleared dead binder\n", prefix);
- break;
- case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
- seq_printf(m, "%shas cleared death notification\n", prefix);
- break;
- default:
- seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
- break;
- }
-}
-
-static void print_binder_thread_ilocked(struct seq_file *m,
- struct binder_thread *thread,
- int print_always)
-{
- struct binder_transaction *t;
- struct binder_work *w;
- size_t start_pos = m->count;
- size_t header_pos;
-
- seq_printf(m, " thread %d: l %02x need_return %d tr %d\n",
- thread->pid, thread->looper,
- thread->looper_need_return,
- atomic_read(&thread->tmp_ref));
- header_pos = m->count;
- t = thread->transaction_stack;
- while (t) {
- if (t->from == thread) {
- print_binder_transaction_ilocked(m, thread->proc,
- " outgoing transaction", t);
- t = t->from_parent;
- } else if (t->to_thread == thread) {
- print_binder_transaction_ilocked(m, thread->proc,
- " incoming transaction", t);
- t = t->to_parent;
- } else {
- print_binder_transaction_ilocked(m, thread->proc,
- " bad transaction", t);
- t = NULL;
- }
- }
- list_for_each_entry(w, &thread->todo, entry) {
- print_binder_work_ilocked(m, thread->proc, " ",
- " pending transaction", w);
- }
- if (!print_always && m->count == header_pos)
- m->count = start_pos;
-}
-
-static void print_binder_node_nilocked(struct seq_file *m,
- struct binder_node *node)
-{
- struct binder_ref *ref;
- struct binder_work *w;
- int count;
-
- count = 0;
- hlist_for_each_entry(ref, &node->refs, node_entry)
- count++;
-
- seq_printf(m, " node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d tr %d",
- node->debug_id, (u64)node->ptr, (u64)node->cookie,
- node->has_strong_ref, node->has_weak_ref,
- node->local_strong_refs, node->local_weak_refs,
- node->internal_strong_refs, count, node->tmp_refs);
- if (count) {
- seq_puts(m, " proc");
- hlist_for_each_entry(ref, &node->refs, node_entry)
- seq_printf(m, " %d", ref->proc->pid);
- }
- seq_puts(m, "\n");
- if (node->proc) {
- list_for_each_entry(w, &node->async_todo, entry)
- print_binder_work_ilocked(m, node->proc, " ",
- " pending async transaction", w);
- }
-}
-
-static void print_binder_ref_olocked(struct seq_file *m,
- struct binder_ref *ref)
-{
- binder_node_lock(ref->node);
- seq_printf(m, " ref %d: desc %d %snode %d s %d w %d d %pK\n",
- ref->data.debug_id, ref->data.desc,
- ref->node->proc ? "" : "dead ",
- ref->node->debug_id, ref->data.strong,
- ref->data.weak, ref->death);
- binder_node_unlock(ref->node);
-}
-
-static void print_binder_proc(struct seq_file *m,
- struct binder_proc *proc, int print_all)
-{
- struct binder_work *w;
- struct rb_node *n;
- size_t start_pos = m->count;
- size_t header_pos;
- struct binder_node *last_node = NULL;
-
- seq_printf(m, "proc %d\n", proc->pid);
- seq_printf(m, "context %s\n", proc->context->name);
- header_pos = m->count;
-
- binder_inner_proc_lock(proc);
- for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
- print_binder_thread_ilocked(m, rb_entry(n, struct binder_thread,
- rb_node), print_all);
-
- for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
- struct binder_node *node = rb_entry(n, struct binder_node,
- rb_node);
- if (!print_all && !node->has_async_transaction)
- continue;
-
- /*
- * take a temporary reference on the node so it
- * survives and isn't removed from the tree
- * while we print it.
- */
- binder_inc_node_tmpref_ilocked(node);
- /* Need to drop inner lock to take node lock */
- binder_inner_proc_unlock(proc);
- if (last_node)
- binder_put_node(last_node);
- binder_node_inner_lock(node);
- print_binder_node_nilocked(m, node);
- binder_node_inner_unlock(node);
- last_node = node;
- binder_inner_proc_lock(proc);
- }
- binder_inner_proc_unlock(proc);
- if (last_node)
- binder_put_node(last_node);
-
- if (print_all) {
- binder_proc_lock(proc);
- for (n = rb_first(&proc->refs_by_desc);
- n != NULL;
- n = rb_next(n))
- print_binder_ref_olocked(m, rb_entry(n,
- struct binder_ref,
- rb_node_desc));
- binder_proc_unlock(proc);
- }
- binder_alloc_print_allocated(m, &proc->alloc);
- binder_inner_proc_lock(proc);
- list_for_each_entry(w, &proc->todo, entry)
- print_binder_work_ilocked(m, proc, " ",
- " pending transaction", w);
- list_for_each_entry(w, &proc->delivered_death, entry) {
- seq_puts(m, " has delivered dead binder\n");
- break;
- }
- binder_inner_proc_unlock(proc);
- if (!print_all && m->count == header_pos)
- m->count = start_pos;
-}
-
-static const char * const binder_return_strings[] = {
- "BR_ERROR",
- "BR_OK",
- "BR_TRANSACTION",
- "BR_REPLY",
- "BR_ACQUIRE_RESULT",
- "BR_DEAD_REPLY",
- "BR_TRANSACTION_COMPLETE",
- "BR_INCREFS",
- "BR_ACQUIRE",
- "BR_RELEASE",
- "BR_DECREFS",
- "BR_ATTEMPT_ACQUIRE",
- "BR_NOOP",
- "BR_SPAWN_LOOPER",
- "BR_FINISHED",
- "BR_DEAD_BINDER",
- "BR_CLEAR_DEATH_NOTIFICATION_DONE",
- "BR_FAILED_REPLY",
- "BR_FROZEN_REPLY",
- "BR_ONEWAY_SPAM_SUSPECT",
- "BR_TRANSACTION_PENDING_FROZEN"
-};
-
-static const char * const binder_command_strings[] = {
- "BC_TRANSACTION",
- "BC_REPLY",
- "BC_ACQUIRE_RESULT",
- "BC_FREE_BUFFER",
- "BC_INCREFS",
- "BC_ACQUIRE",
- "BC_RELEASE",
- "BC_DECREFS",
- "BC_INCREFS_DONE",
- "BC_ACQUIRE_DONE",
- "BC_ATTEMPT_ACQUIRE",
- "BC_REGISTER_LOOPER",
- "BC_ENTER_LOOPER",
- "BC_EXIT_LOOPER",
- "BC_REQUEST_DEATH_NOTIFICATION",
- "BC_CLEAR_DEATH_NOTIFICATION",
- "BC_DEAD_BINDER_DONE",
- "BC_TRANSACTION_SG",
- "BC_REPLY_SG",
-};
-
-static const char * const binder_objstat_strings[] = {
- "proc",
- "thread",
- "node",
- "ref",
- "death",
- "transaction",
- "transaction_complete"
-};
-
-static void print_binder_stats(struct seq_file *m, const char *prefix,
- struct binder_stats *stats)
-{
- int i;
-
- BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
- ARRAY_SIZE(binder_command_strings));
- for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
- int temp = atomic_read(&stats->bc[i]);
-
- if (temp)
- seq_printf(m, "%s%s: %d\n", prefix,
- binder_command_strings[i], temp);
- }
-
- BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
- ARRAY_SIZE(binder_return_strings));
- for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
- int temp = atomic_read(&stats->br[i]);
-
- if (temp)
- seq_printf(m, "%s%s: %d\n", prefix,
- binder_return_strings[i], temp);
- }
-
- BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
- ARRAY_SIZE(binder_objstat_strings));
- BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
- ARRAY_SIZE(stats->obj_deleted));
- for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
- int created = atomic_read(&stats->obj_created[i]);
- int deleted = atomic_read(&stats->obj_deleted[i]);
-
- if (created || deleted)
- seq_printf(m, "%s%s: active %d total %d\n",
- prefix,
- binder_objstat_strings[i],
- created - deleted,
- created);
- }
-}
-
-static void print_binder_proc_stats(struct seq_file *m,
- struct binder_proc *proc)
-{
- struct binder_work *w;
- struct binder_thread *thread;
- struct rb_node *n;
- int count, strong, weak, ready_threads;
- size_t free_async_space =
- binder_alloc_get_free_async_space(&proc->alloc);
-
- seq_printf(m, "proc %d\n", proc->pid);
- seq_printf(m, "context %s\n", proc->context->name);
- count = 0;
- ready_threads = 0;
- binder_inner_proc_lock(proc);
- for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
- count++;
-
- list_for_each_entry(thread, &proc->waiting_threads, waiting_thread_node)
- ready_threads++;
-
- seq_printf(m, " threads: %d\n", count);
- seq_printf(m, " requested threads: %d+%d/%d\n"
- " ready threads %d\n"
- " free async space %zd\n", proc->requested_threads,
- proc->requested_threads_started, proc->max_threads,
- ready_threads,
- free_async_space);
- count = 0;
- for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
- count++;
- binder_inner_proc_unlock(proc);
- seq_printf(m, " nodes: %d\n", count);
- count = 0;
- strong = 0;
- weak = 0;
- binder_proc_lock(proc);
- for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
- struct binder_ref *ref = rb_entry(n, struct binder_ref,
- rb_node_desc);
- count++;
- strong += ref->data.strong;
- weak += ref->data.weak;
- }
- binder_proc_unlock(proc);
- seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak);
-
- count = binder_alloc_get_allocated_count(&proc->alloc);
- seq_printf(m, " buffers: %d\n", count);
-
- binder_alloc_print_pages(m, &proc->alloc);
-
- count = 0;
- binder_inner_proc_lock(proc);
- list_for_each_entry(w, &proc->todo, entry) {
- if (w->type == BINDER_WORK_TRANSACTION)
- count++;
- }
- binder_inner_proc_unlock(proc);
- seq_printf(m, " pending transactions: %d\n", count);
-
- print_binder_stats(m, " ", &proc->stats);
-}
-
-static int state_show(struct seq_file *m, void *unused)
-{
- struct binder_proc *proc;
- struct binder_node *node;
- struct binder_node *last_node = NULL;
-
- seq_puts(m, "binder state:\n");
-
- spin_lock(&binder_dead_nodes_lock);
- if (!hlist_empty(&binder_dead_nodes))
- seq_puts(m, "dead nodes:\n");
- hlist_for_each_entry(node, &binder_dead_nodes, dead_node) {
- /*
- * take a temporary reference on the node so it
- * survives and isn't removed from the list
- * while we print it.
- */
- node->tmp_refs++;
- spin_unlock(&binder_dead_nodes_lock);
- if (last_node)
- binder_put_node(last_node);
- binder_node_lock(node);
- print_binder_node_nilocked(m, node);
- binder_node_unlock(node);
- last_node = node;
- spin_lock(&binder_dead_nodes_lock);
- }
- spin_unlock(&binder_dead_nodes_lock);
- if (last_node)
- binder_put_node(last_node);
-
- mutex_lock(&binder_procs_lock);
- hlist_for_each_entry(proc, &binder_procs, proc_node)
- print_binder_proc(m, proc, 1);
- mutex_unlock(&binder_procs_lock);
-
- return 0;
-}
-
-static int stats_show(struct seq_file *m, void *unused)
-{
- struct binder_proc *proc;
-
- seq_puts(m, "binder stats:\n");
-
- print_binder_stats(m, "", &binder_stats);
-
- mutex_lock(&binder_procs_lock);
- hlist_for_each_entry(proc, &binder_procs, proc_node)
- print_binder_proc_stats(m, proc);
- mutex_unlock(&binder_procs_lock);
-
- return 0;
-}
-
-static int transactions_show(struct seq_file *m, void *unused)
-{
- struct binder_proc *proc;
-
- seq_puts(m, "binder transactions:\n");
- mutex_lock(&binder_procs_lock);
- hlist_for_each_entry(proc, &binder_procs, proc_node)
- print_binder_proc(m, proc, 0);
- mutex_unlock(&binder_procs_lock);
-
- return 0;
-}
-
-static int proc_show(struct seq_file *m, void *unused)
-{
- struct binder_proc *itr;
- int pid = (unsigned long)m->private;
-
- mutex_lock(&binder_procs_lock);
- hlist_for_each_entry(itr, &binder_procs, proc_node) {
- if (itr->pid == pid) {
- seq_puts(m, "binder proc state:\n");
- print_binder_proc(m, itr, 1);
- }
- }
- mutex_unlock(&binder_procs_lock);
-
- return 0;
-}
-
-static void print_binder_transaction_log_entry(struct seq_file *m,
- struct binder_transaction_log_entry *e)
-{
- int debug_id = READ_ONCE(e->debug_id_done);
- /*
- * read barrier to guarantee debug_id_done read before
- * we print the log values
- */
- smp_rmb();
- seq_printf(m,
- "%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d ret %d/%d l=%d",
- e->debug_id, (e->call_type == 2) ? "reply" :
- ((e->call_type == 1) ? "async" : "call "), e->from_proc,
- e->from_thread, e->to_proc, e->to_thread, e->context_name,
- e->to_node, e->target_handle, e->data_size, e->offsets_size,
- e->return_error, e->return_error_param,
- e->return_error_line);
- /*
- * read-barrier to guarantee read of debug_id_done after
- * done printing the fields of the entry
- */
- smp_rmb();
- seq_printf(m, debug_id && debug_id == READ_ONCE(e->debug_id_done) ?
- "\n" : " (incomplete)\n");
-}
-
-static int transaction_log_show(struct seq_file *m, void *unused)
-{
- struct binder_transaction_log *log = m->private;
- unsigned int log_cur = atomic_read(&log->cur);
- unsigned int count;
- unsigned int cur;
- int i;
-
- count = log_cur + 1;
- cur = count < ARRAY_SIZE(log->entry) && !log->full ?
- 0 : count % ARRAY_SIZE(log->entry);
- if (count > ARRAY_SIZE(log->entry) || log->full)
- count = ARRAY_SIZE(log->entry);
- for (i = 0; i < count; i++) {
- unsigned int index = cur++ % ARRAY_SIZE(log->entry);
-
- print_binder_transaction_log_entry(m, &log->entry[index]);
- }
- return 0;
-}
-
-const struct file_operations binder_fops = {
- .owner = THIS_MODULE,
- .poll = binder_poll,
- .unlocked_ioctl = binder_ioctl,
- .compat_ioctl = compat_ptr_ioctl,
- .mmap = binder_mmap,
- .open = binder_open,
- .flush = binder_flush,
- .release = binder_release,
-};
-
-DEFINE_SHOW_ATTRIBUTE(state);
-DEFINE_SHOW_ATTRIBUTE(stats);
-DEFINE_SHOW_ATTRIBUTE(transactions);
-DEFINE_SHOW_ATTRIBUTE(transaction_log);
-
-const struct binder_debugfs_entry binder_debugfs_entries[] = {
- {
- .name = "state",
- .mode = 0444,
- .fops = &state_fops,
- .data = NULL,
- },
- {
- .name = "stats",
- .mode = 0444,
- .fops = &stats_fops,
- .data = NULL,
- },
- {
- .name = "transactions",
- .mode = 0444,
- .fops = &transactions_fops,
- .data = NULL,
- },
- {
- .name = "transaction_log",
- .mode = 0444,
- .fops = &transaction_log_fops,
- .data = &binder_transaction_log,
- },
- {
- .name = "failed_transaction_log",
- .mode = 0444,
- .fops = &transaction_log_fops,
- .data = &binder_transaction_log_failed,
- },
- {} /* terminator */
-};
-
-static int __init init_binder_device(const char *name)
-{
- int ret;
- struct binder_device *binder_device;
-
- binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL);
- if (!binder_device)
- return -ENOMEM;
-
- binder_device->miscdev.fops = &binder_fops;
- binder_device->miscdev.minor = MISC_DYNAMIC_MINOR;
- binder_device->miscdev.name = name;
-
- refcount_set(&binder_device->ref, 1);
- binder_device->context.binder_context_mgr_uid = INVALID_UID;
- binder_device->context.name = name;
- mutex_init(&binder_device->context.context_mgr_node_lock);
-
- ret = misc_register(&binder_device->miscdev);
- if (ret < 0) {
- kfree(binder_device);
- return ret;
- }
-
- hlist_add_head(&binder_device->hlist, &binder_devices);
-
- return ret;
-}
-
-static int __init binder_init(void)
-{
- int ret;
- char *device_name, *device_tmp;
- struct binder_device *device;
- struct hlist_node *tmp;
- char *device_names = NULL;
- const struct binder_debugfs_entry *db_entry;
-
- ret = binder_alloc_shrinker_init();
- if (ret)
- return ret;
-
- atomic_set(&binder_transaction_log.cur, ~0U);
- atomic_set(&binder_transaction_log_failed.cur, ~0U);
-
- binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
-
- binder_for_each_debugfs_entry(db_entry)
- debugfs_create_file(db_entry->name,
- db_entry->mode,
- binder_debugfs_dir_entry_root,
- db_entry->data,
- db_entry->fops);
-
- binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
- binder_debugfs_dir_entry_root);
-
- if (!IS_ENABLED(CONFIG_ANDROID_BINDERFS) &&
- strcmp(binder_devices_param, "") != 0) {
- /*
- * Copy the module_parameter string, because we don't want to
- * tokenize it in-place.
- */
- device_names = kstrdup(binder_devices_param, GFP_KERNEL);
- if (!device_names) {
- ret = -ENOMEM;
- goto err_alloc_device_names_failed;
- }
-
- device_tmp = device_names;
- while ((device_name = strsep(&device_tmp, ","))) {
- ret = init_binder_device(device_name);
- if (ret)
- goto err_init_binder_device_failed;
- }
- }
-
- ret = init_binderfs();
- if (ret)
- goto err_init_binder_device_failed;
-
- return ret;
-
-err_init_binder_device_failed:
- hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) {
- misc_deregister(&device->miscdev);
- hlist_del(&device->hlist);
- kfree(device);
- }
-
- kfree(device_names);
-
-err_alloc_device_names_failed:
- debugfs_remove_recursive(binder_debugfs_dir_entry_root);
- binder_alloc_shrinker_exit();
-
- return ret;
-}
-
-device_initcall(binder_init);
-
-#define CREATE_TRACE_POINTS
-#include "binder_trace.h"
-
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
deleted file mode 100644
index e3db8297095a..000000000000
--- a/drivers/android/binder_alloc.c
+++ /dev/null
@@ -1,1284 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* binder_alloc.c
- *
- * Android IPC Subsystem
- *
- * Copyright (C) 2007-2017 Google, Inc.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/list.h>
-#include <linux/sched/mm.h>
-#include <linux/module.h>
-#include <linux/rtmutex.h>
-#include <linux/rbtree.h>
-#include <linux/seq_file.h>
-#include <linux/vmalloc.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/list_lru.h>
-#include <linux/ratelimit.h>
-#include <asm/cacheflush.h>
-#include <linux/uaccess.h>
-#include <linux/highmem.h>
-#include <linux/sizes.h>
-#include "binder_alloc.h"
-#include "binder_trace.h"
-
-struct list_lru binder_alloc_lru;
-
-static DEFINE_MUTEX(binder_alloc_mmap_lock);
-
-enum {
- BINDER_DEBUG_USER_ERROR = 1U << 0,
- BINDER_DEBUG_OPEN_CLOSE = 1U << 1,
- BINDER_DEBUG_BUFFER_ALLOC = 1U << 2,
- BINDER_DEBUG_BUFFER_ALLOC_ASYNC = 1U << 3,
-};
-static uint32_t binder_alloc_debug_mask = BINDER_DEBUG_USER_ERROR;
-
-module_param_named(debug_mask, binder_alloc_debug_mask,
- uint, 0644);
-
-#define binder_alloc_debug(mask, x...) \
- do { \
- if (binder_alloc_debug_mask & mask) \
- pr_info_ratelimited(x); \
- } while (0)
-
-static struct binder_buffer *binder_buffer_next(struct binder_buffer *buffer)
-{
- return list_entry(buffer->entry.next, struct binder_buffer, entry);
-}
-
-static struct binder_buffer *binder_buffer_prev(struct binder_buffer *buffer)
-{
- return list_entry(buffer->entry.prev, struct binder_buffer, entry);
-}
-
-static size_t binder_alloc_buffer_size(struct binder_alloc *alloc,
- struct binder_buffer *buffer)
-{
- if (list_is_last(&buffer->entry, &alloc->buffers))
- return alloc->buffer + alloc->buffer_size - buffer->user_data;
- return binder_buffer_next(buffer)->user_data - buffer->user_data;
-}
-
-static void binder_insert_free_buffer(struct binder_alloc *alloc,
- struct binder_buffer *new_buffer)
-{
- struct rb_node **p = &alloc->free_buffers.rb_node;
- struct rb_node *parent = NULL;
- struct binder_buffer *buffer;
- size_t buffer_size;
- size_t new_buffer_size;
-
- BUG_ON(!new_buffer->free);
-
- new_buffer_size = binder_alloc_buffer_size(alloc, new_buffer);
-
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: add free buffer, size %zd, at %pK\n",
- alloc->pid, new_buffer_size, new_buffer);
-
- while (*p) {
- parent = *p;
- buffer = rb_entry(parent, struct binder_buffer, rb_node);
- BUG_ON(!buffer->free);
-
- buffer_size = binder_alloc_buffer_size(alloc, buffer);
-
- if (new_buffer_size < buffer_size)
- p = &parent->rb_left;
- else
- p = &parent->rb_right;
- }
- rb_link_node(&new_buffer->rb_node, parent, p);
- rb_insert_color(&new_buffer->rb_node, &alloc->free_buffers);
-}
-
-static void binder_insert_allocated_buffer_locked(
- struct binder_alloc *alloc, struct binder_buffer *new_buffer)
-{
- struct rb_node **p = &alloc->allocated_buffers.rb_node;
- struct rb_node *parent = NULL;
- struct binder_buffer *buffer;
-
- BUG_ON(new_buffer->free);
-
- while (*p) {
- parent = *p;
- buffer = rb_entry(parent, struct binder_buffer, rb_node);
- BUG_ON(buffer->free);
-
- if (new_buffer->user_data < buffer->user_data)
- p = &parent->rb_left;
- else if (new_buffer->user_data > buffer->user_data)
- p = &parent->rb_right;
- else
- BUG();
- }
- rb_link_node(&new_buffer->rb_node, parent, p);
- rb_insert_color(&new_buffer->rb_node, &alloc->allocated_buffers);
-}
-
-static struct binder_buffer *binder_alloc_prepare_to_free_locked(
- struct binder_alloc *alloc,
- uintptr_t user_ptr)
-{
- struct rb_node *n = alloc->allocated_buffers.rb_node;
- struct binder_buffer *buffer;
- void __user *uptr;
-
- uptr = (void __user *)user_ptr;
-
- while (n) {
- buffer = rb_entry(n, struct binder_buffer, rb_node);
- BUG_ON(buffer->free);
-
- if (uptr < buffer->user_data)
- n = n->rb_left;
- else if (uptr > buffer->user_data)
- n = n->rb_right;
- else {
- /*
- * Guard against user threads attempting to
- * free the buffer when in use by kernel or
- * after it's already been freed.
- */
- if (!buffer->allow_user_free)
- return ERR_PTR(-EPERM);
- buffer->allow_user_free = 0;
- return buffer;
- }
- }
- return NULL;
-}
-
-/**
- * binder_alloc_prepare_to_free() - get buffer given user ptr
- * @alloc: binder_alloc for this proc
- * @user_ptr: User pointer to buffer data
- *
- * Validate userspace pointer to buffer data and return buffer corresponding to
- * that user pointer. Search the rb tree for buffer that matches user data
- * pointer.
- *
- * Return: Pointer to buffer or NULL
- */
-struct binder_buffer *binder_alloc_prepare_to_free(struct binder_alloc *alloc,
- uintptr_t user_ptr)
-{
- struct binder_buffer *buffer;
-
- mutex_lock(&alloc->mutex);
- buffer = binder_alloc_prepare_to_free_locked(alloc, user_ptr);
- mutex_unlock(&alloc->mutex);
- return buffer;
-}
-
-static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
- void __user *start, void __user *end)
-{
- void __user *page_addr;
- unsigned long user_page_addr;
- struct binder_lru_page *page;
- struct vm_area_struct *vma = NULL;
- struct mm_struct *mm = NULL;
- bool need_mm = false;
-
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: %s pages %pK-%pK\n", alloc->pid,
- allocate ? "allocate" : "free", start, end);
-
- if (end <= start)
- return 0;
-
- trace_binder_update_page_range(alloc, allocate, start, end);
-
- if (allocate == 0)
- goto free_range;
-
- for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
- page = &alloc->pages[(page_addr - alloc->buffer) / PAGE_SIZE];
- if (!page->page_ptr) {
- need_mm = true;
- break;
- }
- }
-
- if (need_mm && mmget_not_zero(alloc->mm))
- mm = alloc->mm;
-
- if (mm) {
- mmap_write_lock(mm);
- vma = alloc->vma;
- }
-
- if (!vma && need_mm) {
- binder_alloc_debug(BINDER_DEBUG_USER_ERROR,
- "%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
- alloc->pid);
- goto err_no_vma;
- }
-
- for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
- int ret;
- bool on_lru;
- size_t index;
-
- index = (page_addr - alloc->buffer) / PAGE_SIZE;
- page = &alloc->pages[index];
-
- if (page->page_ptr) {
- trace_binder_alloc_lru_start(alloc, index);
-
- on_lru = list_lru_del(&binder_alloc_lru, &page->lru);
- WARN_ON(!on_lru);
-
- trace_binder_alloc_lru_end(alloc, index);
- continue;
- }
-
- if (WARN_ON(!vma))
- goto err_page_ptr_cleared;
-
- trace_binder_alloc_page_start(alloc, index);
- page->page_ptr = alloc_page(GFP_KERNEL |
- __GFP_HIGHMEM |
- __GFP_ZERO);
- if (!page->page_ptr) {
- pr_err("%d: binder_alloc_buf failed for page at %pK\n",
- alloc->pid, page_addr);
- goto err_alloc_page_failed;
- }
- page->alloc = alloc;
- INIT_LIST_HEAD(&page->lru);
-
- user_page_addr = (uintptr_t)page_addr;
- ret = vm_insert_page(vma, user_page_addr, page[0].page_ptr);
- if (ret) {
- pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
- alloc->pid, user_page_addr);
- goto err_vm_insert_page_failed;
- }
-
- if (index + 1 > alloc->pages_high)
- alloc->pages_high = index + 1;
-
- trace_binder_alloc_page_end(alloc, index);
- }
- if (mm) {
- mmap_write_unlock(mm);
- mmput(mm);
- }
- return 0;
-
-free_range:
- for (page_addr = end - PAGE_SIZE; 1; page_addr -= PAGE_SIZE) {
- bool ret;
- size_t index;
-
- index = (page_addr - alloc->buffer) / PAGE_SIZE;
- page = &alloc->pages[index];
-
- trace_binder_free_lru_start(alloc, index);
-
- ret = list_lru_add(&binder_alloc_lru, &page->lru);
- WARN_ON(!ret);
-
- trace_binder_free_lru_end(alloc, index);
- if (page_addr == start)
- break;
- continue;
-
-err_vm_insert_page_failed:
- __free_page(page->page_ptr);
- page->page_ptr = NULL;
-err_alloc_page_failed:
-err_page_ptr_cleared:
- if (page_addr == start)
- break;
- }
-err_no_vma:
- if (mm) {
- mmap_write_unlock(mm);
- mmput(mm);
- }
- return vma ? -ENOMEM : -ESRCH;
-}
-
-static inline void binder_alloc_set_vma(struct binder_alloc *alloc,
- struct vm_area_struct *vma)
-{
- /* pairs with smp_load_acquire in binder_alloc_get_vma() */
- smp_store_release(&alloc->vma, vma);
-}
-
-static inline struct vm_area_struct *binder_alloc_get_vma(
- struct binder_alloc *alloc)
-{
- /* pairs with smp_store_release in binder_alloc_set_vma() */
- return smp_load_acquire(&alloc->vma);
-}
-
-static bool debug_low_async_space_locked(struct binder_alloc *alloc, int pid)
-{
- /*
- * Find the amount and size of buffers allocated by the current caller;
- * The idea is that once we cross the threshold, whoever is responsible
- * for the low async space is likely to try to send another async txn,
- * and at some point we'll catch them in the act. This is more efficient
- * than keeping a map per pid.
- */
- struct rb_node *n;
- struct binder_buffer *buffer;
- size_t total_alloc_size = 0;
- size_t num_buffers = 0;
-
- for (n = rb_first(&alloc->allocated_buffers); n != NULL;
- n = rb_next(n)) {
- buffer = rb_entry(n, struct binder_buffer, rb_node);
- if (buffer->pid != pid)
- continue;
- if (!buffer->async_transaction)
- continue;
- total_alloc_size += binder_alloc_buffer_size(alloc, buffer)
- + sizeof(struct binder_buffer);
- num_buffers++;
- }
-
- /*
- * Warn if this pid has more than 50 transactions, or more than 50% of
- * async space (which is 25% of total buffer size). Oneway spam is only
- * detected when the threshold is exceeded.
- */
- if (num_buffers > 50 || total_alloc_size > alloc->buffer_size / 4) {
- binder_alloc_debug(BINDER_DEBUG_USER_ERROR,
- "%d: pid %d spamming oneway? %zd buffers allocated for a total size of %zd\n",
- alloc->pid, pid, num_buffers, total_alloc_size);
- if (!alloc->oneway_spam_detected) {
- alloc->oneway_spam_detected = true;
- return true;
- }
- }
- return false;
-}
-
-static struct binder_buffer *binder_alloc_new_buf_locked(
- struct binder_alloc *alloc,
- size_t data_size,
- size_t offsets_size,
- size_t extra_buffers_size,
- int is_async,
- int pid)
-{
- struct rb_node *n = alloc->free_buffers.rb_node;
- struct binder_buffer *buffer;
- size_t buffer_size;
- struct rb_node *best_fit = NULL;
- void __user *has_page_addr;
- void __user *end_page_addr;
- size_t size, data_offsets_size;
- int ret;
-
- /* Check binder_alloc is fully initialized */
- if (!binder_alloc_get_vma(alloc)) {
- binder_alloc_debug(BINDER_DEBUG_USER_ERROR,
- "%d: binder_alloc_buf, no vma\n",
- alloc->pid);
- return ERR_PTR(-ESRCH);
- }
-
- data_offsets_size = ALIGN(data_size, sizeof(void *)) +
- ALIGN(offsets_size, sizeof(void *));
-
- if (data_offsets_size < data_size || data_offsets_size < offsets_size) {
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: got transaction with invalid size %zd-%zd\n",
- alloc->pid, data_size, offsets_size);
- return ERR_PTR(-EINVAL);
- }
- size = data_offsets_size + ALIGN(extra_buffers_size, sizeof(void *));
- if (size < data_offsets_size || size < extra_buffers_size) {
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: got transaction with invalid extra_buffers_size %zd\n",
- alloc->pid, extra_buffers_size);
- return ERR_PTR(-EINVAL);
- }
- if (is_async &&
- alloc->free_async_space < size + sizeof(struct binder_buffer)) {
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: binder_alloc_buf size %zd failed, no async space left\n",
- alloc->pid, size);
- return ERR_PTR(-ENOSPC);
- }
-
- /* Pad 0-size buffers so they get assigned unique addresses */
- size = max(size, sizeof(void *));
-
- while (n) {
- buffer = rb_entry(n, struct binder_buffer, rb_node);
- BUG_ON(!buffer->free);
- buffer_size = binder_alloc_buffer_size(alloc, buffer);
-
- if (size < buffer_size) {
- best_fit = n;
- n = n->rb_left;
- } else if (size > buffer_size)
- n = n->rb_right;
- else {
- best_fit = n;
- break;
- }
- }
- if (best_fit == NULL) {
- size_t allocated_buffers = 0;
- size_t largest_alloc_size = 0;
- size_t total_alloc_size = 0;
- size_t free_buffers = 0;
- size_t largest_free_size = 0;
- size_t total_free_size = 0;
-
- for (n = rb_first(&alloc->allocated_buffers); n != NULL;
- n = rb_next(n)) {
- buffer = rb_entry(n, struct binder_buffer, rb_node);
- buffer_size = binder_alloc_buffer_size(alloc, buffer);
- allocated_buffers++;
- total_alloc_size += buffer_size;
- if (buffer_size > largest_alloc_size)
- largest_alloc_size = buffer_size;
- }
- for (n = rb_first(&alloc->free_buffers); n != NULL;
- n = rb_next(n)) {
- buffer = rb_entry(n, struct binder_buffer, rb_node);
- buffer_size = binder_alloc_buffer_size(alloc, buffer);
- free_buffers++;
- total_free_size += buffer_size;
- if (buffer_size > largest_free_size)
- largest_free_size = buffer_size;
- }
- binder_alloc_debug(BINDER_DEBUG_USER_ERROR,
- "%d: binder_alloc_buf size %zd failed, no address space\n",
- alloc->pid, size);
- binder_alloc_debug(BINDER_DEBUG_USER_ERROR,
- "allocated: %zd (num: %zd largest: %zd), free: %zd (num: %zd largest: %zd)\n",
- total_alloc_size, allocated_buffers,
- largest_alloc_size, total_free_size,
- free_buffers, largest_free_size);
- return ERR_PTR(-ENOSPC);
- }
- if (n == NULL) {
- buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
- buffer_size = binder_alloc_buffer_size(alloc, buffer);
- }
-
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: binder_alloc_buf size %zd got buffer %pK size %zd\n",
- alloc->pid, size, buffer, buffer_size);
-
- has_page_addr = (void __user *)
- (((uintptr_t)buffer->user_data + buffer_size) & PAGE_MASK);
- WARN_ON(n && buffer_size != size);
- end_page_addr =
- (void __user *)PAGE_ALIGN((uintptr_t)buffer->user_data + size);
- if (end_page_addr > has_page_addr)
- end_page_addr = has_page_addr;
- ret = binder_update_page_range(alloc, 1, (void __user *)
- PAGE_ALIGN((uintptr_t)buffer->user_data), end_page_addr);
- if (ret)
- return ERR_PTR(ret);
-
- if (buffer_size != size) {
- struct binder_buffer *new_buffer;
-
- new_buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
- if (!new_buffer) {
- pr_err("%s: %d failed to alloc new buffer struct\n",
- __func__, alloc->pid);
- goto err_alloc_buf_struct_failed;
- }
- new_buffer->user_data = (u8 __user *)buffer->user_data + size;
- list_add(&new_buffer->entry, &buffer->entry);
- new_buffer->free = 1;
- binder_insert_free_buffer(alloc, new_buffer);
- }
-
- rb_erase(best_fit, &alloc->free_buffers);
- buffer->free = 0;
- buffer->allow_user_free = 0;
- binder_insert_allocated_buffer_locked(alloc, buffer);
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: binder_alloc_buf size %zd got %pK\n",
- alloc->pid, size, buffer);
- buffer->data_size = data_size;
- buffer->offsets_size = offsets_size;
- buffer->async_transaction = is_async;
- buffer->extra_buffers_size = extra_buffers_size;
- buffer->pid = pid;
- buffer->oneway_spam_suspect = false;
- if (is_async) {
- alloc->free_async_space -= size + sizeof(struct binder_buffer);
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
- "%d: binder_alloc_buf size %zd async free %zd\n",
- alloc->pid, size, alloc->free_async_space);
- if (alloc->free_async_space < alloc->buffer_size / 10) {
- /*
- * Start detecting spammers once we have less than 20%
- * of async space left (which is less than 10% of total
- * buffer size).
- */
- buffer->oneway_spam_suspect = debug_low_async_space_locked(alloc, pid);
- } else {
- alloc->oneway_spam_detected = false;
- }
- }
- return buffer;
-
-err_alloc_buf_struct_failed:
- binder_update_page_range(alloc, 0, (void __user *)
- PAGE_ALIGN((uintptr_t)buffer->user_data),
- end_page_addr);
- return ERR_PTR(-ENOMEM);
-}
-
-/**
- * binder_alloc_new_buf() - Allocate a new binder buffer
- * @alloc: binder_alloc for this proc
- * @data_size: size of user data buffer
- * @offsets_size: user specified buffer offset
- * @extra_buffers_size: size of extra space for meta-data (eg, security context)
- * @is_async: buffer for async transaction
- * @pid: pid to attribute allocation to (used for debugging)
- *
- * Allocate a new buffer given the requested sizes. Returns
- * the kernel version of the buffer pointer. The size allocated
- * is the sum of the three given sizes (each rounded up to
- * pointer-sized boundary)
- *
- * Return: The allocated buffer or %NULL if error
- */
-struct binder_buffer *binder_alloc_new_buf(struct binder_alloc *alloc,
- size_t data_size,
- size_t offsets_size,
- size_t extra_buffers_size,
- int is_async,
- int pid)
-{
- struct binder_buffer *buffer;
-
- mutex_lock(&alloc->mutex);
- buffer = binder_alloc_new_buf_locked(alloc, data_size, offsets_size,
- extra_buffers_size, is_async, pid);
- mutex_unlock(&alloc->mutex);
- return buffer;
-}
-
-static void __user *buffer_start_page(struct binder_buffer *buffer)
-{
- return (void __user *)((uintptr_t)buffer->user_data & PAGE_MASK);
-}
-
-static void __user *prev_buffer_end_page(struct binder_buffer *buffer)
-{
- return (void __user *)
- (((uintptr_t)(buffer->user_data) - 1) & PAGE_MASK);
-}
-
-static void binder_delete_free_buffer(struct binder_alloc *alloc,
- struct binder_buffer *buffer)
-{
- struct binder_buffer *prev, *next = NULL;
- bool to_free = true;
-
- BUG_ON(alloc->buffers.next == &buffer->entry);
- prev = binder_buffer_prev(buffer);
- BUG_ON(!prev->free);
- if (prev_buffer_end_page(prev) == buffer_start_page(buffer)) {
- to_free = false;
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: merge free, buffer %pK share page with %pK\n",
- alloc->pid, buffer->user_data,
- prev->user_data);
- }
-
- if (!list_is_last(&buffer->entry, &alloc->buffers)) {
- next = binder_buffer_next(buffer);
- if (buffer_start_page(next) == buffer_start_page(buffer)) {
- to_free = false;
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: merge free, buffer %pK share page with %pK\n",
- alloc->pid,
- buffer->user_data,
- next->user_data);
- }
- }
-
- if (PAGE_ALIGNED(buffer->user_data)) {
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: merge free, buffer start %pK is page aligned\n",
- alloc->pid, buffer->user_data);
- to_free = false;
- }
-
- if (to_free) {
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: merge free, buffer %pK do not share page with %pK or %pK\n",
- alloc->pid, buffer->user_data,
- prev->user_data,
- next ? next->user_data : NULL);
- binder_update_page_range(alloc, 0, buffer_start_page(buffer),
- buffer_start_page(buffer) + PAGE_SIZE);
- }
- list_del(&buffer->entry);
- kfree(buffer);
-}
-
-static void binder_free_buf_locked(struct binder_alloc *alloc,
- struct binder_buffer *buffer)
-{
- size_t size, buffer_size;
-
- buffer_size = binder_alloc_buffer_size(alloc, buffer);
-
- size = ALIGN(buffer->data_size, sizeof(void *)) +
- ALIGN(buffer->offsets_size, sizeof(void *)) +
- ALIGN(buffer->extra_buffers_size, sizeof(void *));
-
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%d: binder_free_buf %pK size %zd buffer_size %zd\n",
- alloc->pid, buffer, size, buffer_size);
-
- BUG_ON(buffer->free);
- BUG_ON(size > buffer_size);
- BUG_ON(buffer->transaction != NULL);
- BUG_ON(buffer->user_data < alloc->buffer);
- BUG_ON(buffer->user_data > alloc->buffer + alloc->buffer_size);
-
- if (buffer->async_transaction) {
- alloc->free_async_space += buffer_size + sizeof(struct binder_buffer);
-
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
- "%d: binder_free_buf size %zd async free %zd\n",
- alloc->pid, size, alloc->free_async_space);
- }
-
- binder_update_page_range(alloc, 0,
- (void __user *)PAGE_ALIGN((uintptr_t)buffer->user_data),
- (void __user *)(((uintptr_t)
- buffer->user_data + buffer_size) & PAGE_MASK));
-
- rb_erase(&buffer->rb_node, &alloc->allocated_buffers);
- buffer->free = 1;
- if (!list_is_last(&buffer->entry, &alloc->buffers)) {
- struct binder_buffer *next = binder_buffer_next(buffer);
-
- if (next->free) {
- rb_erase(&next->rb_node, &alloc->free_buffers);
- binder_delete_free_buffer(alloc, next);
- }
- }
- if (alloc->buffers.next != &buffer->entry) {
- struct binder_buffer *prev = binder_buffer_prev(buffer);
-
- if (prev->free) {
- binder_delete_free_buffer(alloc, buffer);
- rb_erase(&prev->rb_node, &alloc->free_buffers);
- buffer = prev;
- }
- }
- binder_insert_free_buffer(alloc, buffer);
-}
-
-static void binder_alloc_clear_buf(struct binder_alloc *alloc,
- struct binder_buffer *buffer);
-/**
- * binder_alloc_free_buf() - free a binder buffer
- * @alloc: binder_alloc for this proc
- * @buffer: kernel pointer to buffer
- *
- * Free the buffer allocated via binder_alloc_new_buf()
- */
-void binder_alloc_free_buf(struct binder_alloc *alloc,
- struct binder_buffer *buffer)
-{
- /*
- * We could eliminate the call to binder_alloc_clear_buf()
- * from binder_alloc_deferred_release() by moving this to
- * binder_alloc_free_buf_locked(). However, that could
- * increase contention for the alloc mutex if clear_on_free
- * is used frequently for large buffers. The mutex is not
- * needed for correctness here.
- */
- if (buffer->clear_on_free) {
- binder_alloc_clear_buf(alloc, buffer);
- buffer->clear_on_free = false;
- }
- mutex_lock(&alloc->mutex);
- binder_free_buf_locked(alloc, buffer);
- mutex_unlock(&alloc->mutex);
-}
-
-/**
- * binder_alloc_mmap_handler() - map virtual address space for proc
- * @alloc: alloc structure for this proc
- * @vma: vma passed to mmap()
- *
- * Called by binder_mmap() to initialize the space specified in
- * vma for allocating binder buffers
- *
- * Return:
- * 0 = success
- * -EBUSY = address space already mapped
- * -ENOMEM = failed to map memory to given address space
- */
-int binder_alloc_mmap_handler(struct binder_alloc *alloc,
- struct vm_area_struct *vma)
-{
- int ret;
- const char *failure_string;
- struct binder_buffer *buffer;
-
- if (unlikely(vma->vm_mm != alloc->mm)) {
- ret = -EINVAL;
- failure_string = "invalid vma->vm_mm";
- goto err_invalid_mm;
- }
-
- mutex_lock(&binder_alloc_mmap_lock);
- if (alloc->buffer_size) {
- ret = -EBUSY;
- failure_string = "already mapped";
- goto err_already_mapped;
- }
- alloc->buffer_size = min_t(unsigned long, vma->vm_end - vma->vm_start,
- SZ_4M);
- mutex_unlock(&binder_alloc_mmap_lock);
-
- alloc->buffer = (void __user *)vma->vm_start;
-
- alloc->pages = kcalloc(alloc->buffer_size / PAGE_SIZE,
- sizeof(alloc->pages[0]),
- GFP_KERNEL);
- if (alloc->pages == NULL) {
- ret = -ENOMEM;
- failure_string = "alloc page array";
- goto err_alloc_pages_failed;
- }
-
- buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
- if (!buffer) {
- ret = -ENOMEM;
- failure_string = "alloc buffer struct";
- goto err_alloc_buf_struct_failed;
- }
-
- buffer->user_data = alloc->buffer;
- list_add(&buffer->entry, &alloc->buffers);
- buffer->free = 1;
- binder_insert_free_buffer(alloc, buffer);
- alloc->free_async_space = alloc->buffer_size / 2;
-
- /* Signal binder_alloc is fully initialized */
- binder_alloc_set_vma(alloc, vma);
-
- return 0;
-
-err_alloc_buf_struct_failed:
- kfree(alloc->pages);
- alloc->pages = NULL;
-err_alloc_pages_failed:
- alloc->buffer = NULL;
- mutex_lock(&binder_alloc_mmap_lock);
- alloc->buffer_size = 0;
-err_already_mapped:
- mutex_unlock(&binder_alloc_mmap_lock);
-err_invalid_mm:
- binder_alloc_debug(BINDER_DEBUG_USER_ERROR,
- "%s: %d %lx-%lx %s failed %d\n", __func__,
- alloc->pid, vma->vm_start, vma->vm_end,
- failure_string, ret);
- return ret;
-}
-
-
-void binder_alloc_deferred_release(struct binder_alloc *alloc)
-{
- struct rb_node *n;
- int buffers, page_count;
- struct binder_buffer *buffer;
-
- buffers = 0;
- mutex_lock(&alloc->mutex);
- BUG_ON(alloc->vma);
-
- while ((n = rb_first(&alloc->allocated_buffers))) {
- buffer = rb_entry(n, struct binder_buffer, rb_node);
-
- /* Transaction should already have been freed */
- BUG_ON(buffer->transaction);
-
- if (buffer->clear_on_free) {
- binder_alloc_clear_buf(alloc, buffer);
- buffer->clear_on_free = false;
- }
- binder_free_buf_locked(alloc, buffer);
- buffers++;
- }
-
- while (!list_empty(&alloc->buffers)) {
- buffer = list_first_entry(&alloc->buffers,
- struct binder_buffer, entry);
- WARN_ON(!buffer->free);
-
- list_del(&buffer->entry);
- WARN_ON_ONCE(!list_empty(&alloc->buffers));
- kfree(buffer);
- }
-
- page_count = 0;
- if (alloc->pages) {
- int i;
-
- for (i = 0; i < alloc->buffer_size / PAGE_SIZE; i++) {
- void __user *page_addr;
- bool on_lru;
-
- if (!alloc->pages[i].page_ptr)
- continue;
-
- on_lru = list_lru_del(&binder_alloc_lru,
- &alloc->pages[i].lru);
- page_addr = alloc->buffer + i * PAGE_SIZE;
- binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
- "%s: %d: page %d at %pK %s\n",
- __func__, alloc->pid, i, page_addr,
- on_lru ? "on lru" : "active");
- __free_page(alloc->pages[i].page_ptr);
- page_count++;
- }
- kfree(alloc->pages);
- }
- mutex_unlock(&alloc->mutex);
- if (alloc->mm)
- mmdrop(alloc->mm);
-
- binder_alloc_debug(BINDER_DEBUG_OPEN_CLOSE,
- "%s: %d buffers %d, pages %d\n",
- __func__, alloc->pid, buffers, page_count);
-}
-
-static void print_binder_buffer(struct seq_file *m, const char *prefix,
- struct binder_buffer *buffer)
-{
- seq_printf(m, "%s %d: %pK size %zd:%zd:%zd %s\n",
- prefix, buffer->debug_id, buffer->user_data,
- buffer->data_size, buffer->offsets_size,
- buffer->extra_buffers_size,
- buffer->transaction ? "active" : "delivered");
-}
-
-/**
- * binder_alloc_print_allocated() - print buffer info
- * @m: seq_file for output via seq_printf()
- * @alloc: binder_alloc for this proc
- *
- * Prints information about every buffer associated with
- * the binder_alloc state to the given seq_file
- */
-void binder_alloc_print_allocated(struct seq_file *m,
- struct binder_alloc *alloc)
-{
- struct rb_node *n;
-
- mutex_lock(&alloc->mutex);
- for (n = rb_first(&alloc->allocated_buffers); n != NULL; n = rb_next(n))
- print_binder_buffer(m, " buffer",
- rb_entry(n, struct binder_buffer, rb_node));
- mutex_unlock(&alloc->mutex);
-}
-
-/**
- * binder_alloc_print_pages() - print page usage
- * @m: seq_file for output via seq_printf()
- * @alloc: binder_alloc for this proc
- */
-void binder_alloc_print_pages(struct seq_file *m,
- struct binder_alloc *alloc)
-{
- struct binder_lru_page *page;
- int i;
- int active = 0;
- int lru = 0;
- int free = 0;
-
- mutex_lock(&alloc->mutex);
- /*
- * Make sure the binder_alloc is fully initialized, otherwise we might
- * read inconsistent state.
- */
- if (binder_alloc_get_vma(alloc) != NULL) {
- for (i = 0; i < alloc->buffer_size / PAGE_SIZE; i++) {
- page = &alloc->pages[i];
- if (!page->page_ptr)
- free++;
- else if (list_empty(&page->lru))
- active++;
- else
- lru++;
- }
- }
- mutex_unlock(&alloc->mutex);
- seq_printf(m, " pages: %d:%d:%d\n", active, lru, free);
- seq_printf(m, " pages high watermark: %zu\n", alloc->pages_high);
-}
-
-/**
- * binder_alloc_get_allocated_count() - return count of buffers
- * @alloc: binder_alloc for this proc
- *
- * Return: count of allocated buffers
- */
-int binder_alloc_get_allocated_count(struct binder_alloc *alloc)
-{
- struct rb_node *n;
- int count = 0;
-
- mutex_lock(&alloc->mutex);
- for (n = rb_first(&alloc->allocated_buffers); n != NULL; n = rb_next(n))
- count++;
- mutex_unlock(&alloc->mutex);
- return count;
-}
-
-
-/**
- * binder_alloc_vma_close() - invalidate address space
- * @alloc: binder_alloc for this proc
- *
- * Called from binder_vma_close() when releasing address space.
- * Clears alloc->vma to prevent new incoming transactions from
- * allocating more buffers.
- */
-void binder_alloc_vma_close(struct binder_alloc *alloc)
-{
- binder_alloc_set_vma(alloc, NULL);
-}
-
-/**
- * binder_alloc_free_page() - shrinker callback to free pages
- * @item: item to free
- * @lock: lock protecting the item
- * @cb_arg: callback argument
- *
- * Called from list_lru_walk() in binder_shrink_scan() to free
- * up pages when the system is under memory pressure.
- */
-enum lru_status binder_alloc_free_page(struct list_head *item,
- struct list_lru_one *lru,
- spinlock_t *lock,
- void *cb_arg)
- __must_hold(lock)
-{
- struct mm_struct *mm = NULL;
- struct binder_lru_page *page = container_of(item,
- struct binder_lru_page,
- lru);
- struct binder_alloc *alloc;
- uintptr_t page_addr;
- size_t index;
- struct vm_area_struct *vma;
-
- alloc = page->alloc;
- if (!mutex_trylock(&alloc->mutex))
- goto err_get_alloc_mutex_failed;
-
- if (!page->page_ptr)
- goto err_page_already_freed;
-
- index = page - alloc->pages;
- page_addr = (uintptr_t)alloc->buffer + index * PAGE_SIZE;
-
- mm = alloc->mm;
- if (!mmget_not_zero(mm))
- goto err_mmget;
- if (!mmap_read_trylock(mm))
- goto err_mmap_read_lock_failed;
- vma = binder_alloc_get_vma(alloc);
-
- list_lru_isolate(lru, item);
- spin_unlock(lock);
-
- if (vma) {
- trace_binder_unmap_user_start(alloc, index);
-
- zap_page_range_single(vma, page_addr, PAGE_SIZE, NULL);
-
- trace_binder_unmap_user_end(alloc, index);
- }
- mmap_read_unlock(mm);
- mmput_async(mm);
-
- trace_binder_unmap_kernel_start(alloc, index);
-
- __free_page(page->page_ptr);
- page->page_ptr = NULL;
-
- trace_binder_unmap_kernel_end(alloc, index);
-
- spin_lock(lock);
- mutex_unlock(&alloc->mutex);
- return LRU_REMOVED_RETRY;
-
-err_mmap_read_lock_failed:
- mmput_async(mm);
-err_mmget:
-err_page_already_freed:
- mutex_unlock(&alloc->mutex);
-err_get_alloc_mutex_failed:
- return LRU_SKIP;
-}
-
-static unsigned long
-binder_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
-{
- return list_lru_count(&binder_alloc_lru);
-}
-
-static unsigned long
-binder_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
-{
- return list_lru_walk(&binder_alloc_lru, binder_alloc_free_page,
- NULL, sc->nr_to_scan);
-}
-
-static struct shrinker binder_shrinker = {
- .count_objects = binder_shrink_count,
- .scan_objects = binder_shrink_scan,
- .seeks = DEFAULT_SEEKS,
-};
-
-/**
- * binder_alloc_init() - called by binder_open() for per-proc initialization
- * @alloc: binder_alloc for this proc
- *
- * Called from binder_open() to initialize binder_alloc fields for
- * new binder proc
- */
-void binder_alloc_init(struct binder_alloc *alloc)
-{
- alloc->pid = current->group_leader->pid;
- alloc->mm = current->mm;
- mmgrab(alloc->mm);
- mutex_init(&alloc->mutex);
- INIT_LIST_HEAD(&alloc->buffers);
-}
-
-int binder_alloc_shrinker_init(void)
-{
- int ret = list_lru_init(&binder_alloc_lru);
-
- if (ret == 0) {
- ret = register_shrinker(&binder_shrinker, "android-binder");
- if (ret)
- list_lru_destroy(&binder_alloc_lru);
- }
- return ret;
-}
-
-void binder_alloc_shrinker_exit(void)
-{
- unregister_shrinker(&binder_shrinker);
- list_lru_destroy(&binder_alloc_lru);
-}
-
-/**
- * check_buffer() - verify that buffer/offset is safe to access
- * @alloc: binder_alloc for this proc
- * @buffer: binder buffer to be accessed
- * @offset: offset into @buffer data
- * @bytes: bytes to access from offset
- *
- * Check that the @offset/@bytes are within the size of the given
- * @buffer and that the buffer is currently active and not freeable.
- * Offsets must also be multiples of sizeof(u32). The kernel is
- * allowed to touch the buffer in two cases:
- *
- * 1) when the buffer is being created:
- * (buffer->free == 0 && buffer->allow_user_free == 0)
- * 2) when the buffer is being torn down:
- * (buffer->free == 0 && buffer->transaction == NULL).
- *
- * Return: true if the buffer is safe to access
- */
-static inline bool check_buffer(struct binder_alloc *alloc,
- struct binder_buffer *buffer,
- binder_size_t offset, size_t bytes)
-{
- size_t buffer_size = binder_alloc_buffer_size(alloc, buffer);
-
- return buffer_size >= bytes &&
- offset <= buffer_size - bytes &&
- IS_ALIGNED(offset, sizeof(u32)) &&
- !buffer->free &&
- (!buffer->allow_user_free || !buffer->transaction);
-}
-
-/**
- * binder_alloc_get_page() - get kernel pointer for given buffer offset
- * @alloc: binder_alloc for this proc
- * @buffer: binder buffer to be accessed
- * @buffer_offset: offset into @buffer data
- * @pgoffp: address to copy final page offset to
- *
- * Lookup the struct page corresponding to the address
- * at @buffer_offset into @buffer->user_data. If @pgoffp is not
- * NULL, the byte-offset into the page is written there.
- *
- * The caller is responsible to ensure that the offset points
- * to a valid address within the @buffer and that @buffer is
- * not freeable by the user. Since it can't be freed, we are
- * guaranteed that the corresponding elements of @alloc->pages[]
- * cannot change.
- *
- * Return: struct page
- */
-static struct page *binder_alloc_get_page(struct binder_alloc *alloc,
- struct binder_buffer *buffer,
- binder_size_t buffer_offset,
- pgoff_t *pgoffp)
-{
- binder_size_t buffer_space_offset = buffer_offset +
- (buffer->user_data - alloc->buffer);
- pgoff_t pgoff = buffer_space_offset & ~PAGE_MASK;
- size_t index = buffer_space_offset >> PAGE_SHIFT;
- struct binder_lru_page *lru_page;
-
- lru_page = &alloc->pages[index];
- *pgoffp = pgoff;
- return lru_page->page_ptr;
-}
-
-/**
- * binder_alloc_clear_buf() - zero out buffer
- * @alloc: binder_alloc for this proc
- * @buffer: binder buffer to be cleared
- *
- * memset the given buffer to 0
- */
-static void binder_alloc_clear_buf(struct binder_alloc *alloc,
- struct binder_buffer *buffer)
-{
- size_t bytes = binder_alloc_buffer_size(alloc, buffer);
- binder_size_t buffer_offset = 0;
-
- while (bytes) {
- unsigned long size;
- struct page *page;
- pgoff_t pgoff;
-
- page = binder_alloc_get_page(alloc, buffer,
- buffer_offset, &pgoff);
- size = min_t(size_t, bytes, PAGE_SIZE - pgoff);
- memset_page(page, pgoff, 0, size);
- bytes -= size;
- buffer_offset += size;
- }
-}
-
-/**
- * binder_alloc_copy_user_to_buffer() - copy src user to tgt user
- * @alloc: binder_alloc for this proc
- * @buffer: binder buffer to be accessed
- * @buffer_offset: offset into @buffer data
- * @from: userspace pointer to source buffer
- * @bytes: bytes to copy
- *
- * Copy bytes from source userspace to target buffer.
- *
- * Return: bytes remaining to be copied
- */
-unsigned long
-binder_alloc_copy_user_to_buffer(struct binder_alloc *alloc,
- struct binder_buffer *buffer,
- binder_size_t buffer_offset,
- const void __user *from,
- size_t bytes)
-{
- if (!check_buffer(alloc, buffer, buffer_offset, bytes))
- return bytes;
-
- while (bytes) {
- unsigned long size;
- unsigned long ret;
- struct page *page;
- pgoff_t pgoff;
- void *kptr;
-
- page = binder_alloc_get_page(alloc, buffer,
- buffer_offset, &pgoff);
- size = min_t(size_t, bytes, PAGE_SIZE - pgoff);
- kptr = kmap_local_page(page) + pgoff;
- ret = copy_from_user(kptr, from, size);
- kunmap_local(kptr);
- if (ret)
- return bytes - size + ret;
- bytes -= size;
- from += size;
- buffer_offset += size;
- }
- return 0;
-}
-
-static int binder_alloc_do_buffer_copy(struct binder_alloc *alloc,
- bool to_buffer,
- struct binder_buffer *buffer,
- binder_size_t buffer_offset,
- void *ptr,
- size_t bytes)
-{
- /* All copies must be 32-bit aligned and 32-bit size */
- if (!check_buffer(alloc, buffer, buffer_offset, bytes))
- return -EINVAL;
-
- while (bytes) {
- unsigned long size;
- struct page *page;
- pgoff_t pgoff;
-
- page = binder_alloc_get_page(alloc, buffer,
- buffer_offset, &pgoff);
- size = min_t(size_t, bytes, PAGE_SIZE - pgoff);
- if (to_buffer)
- memcpy_to_page(page, pgoff, ptr, size);
- else
- memcpy_from_page(ptr, page, pgoff, size);
- bytes -= size;
- pgoff = 0;
- ptr = ptr + size;
- buffer_offset += size;
- }
- return 0;
-}
-
-int binder_alloc_copy_to_buffer(struct binder_alloc *alloc,
- struct binder_buffer *buffer,
- binder_size_t buffer_offset,
- void *src,
- size_t bytes)
-{
- return binder_alloc_do_buffer_copy(alloc, true, buffer, buffer_offset,
- src, bytes);
-}
-
-int binder_alloc_copy_from_buffer(struct binder_alloc *alloc,
- void *dest,
- struct binder_buffer *buffer,
- binder_size_t buffer_offset,
- size_t bytes)
-{
- return binder_alloc_do_buffer_copy(alloc, false, buffer, buffer_offset,
- dest, bytes);
-}
-
diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
deleted file mode 100644
index 420dc9cbf774..000000000000
--- a/drivers/android/binderfs.c
+++ /dev/null
@@ -1,827 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-#include <linux/compiler_types.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/fsnotify.h>
-#include <linux/gfp.h>
-#include <linux/idr.h>
-#include <linux/init.h>
-#include <linux/ipc_namespace.h>
-#include <linux/kdev_t.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/namei.h>
-#include <linux/magic.h>
-#include <linux/major.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/mount.h>
-#include <linux/fs_parser.h>
-#include <linux/sched.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include <linux/spinlock_types.h>
-#include <linux/stddef.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/uaccess.h>
-#include <linux/user_namespace.h>
-#include <linux/xarray.h>
-#include <uapi/asm-generic/errno-base.h>
-#include <uapi/linux/android/binder.h>
-#include <uapi/linux/android/binderfs.h>
-
-#include "binder_internal.h"
-
-#define FIRST_INODE 1
-#define SECOND_INODE 2
-#define INODE_OFFSET 3
-#define BINDERFS_MAX_MINOR (1U << MINORBITS)
-/* Ensure that the initial ipc namespace always has devices available. */
-#define BINDERFS_MAX_MINOR_CAPPED (BINDERFS_MAX_MINOR - 4)
-
-static dev_t binderfs_dev;
-static DEFINE_MUTEX(binderfs_minors_mutex);
-static DEFINE_IDA(binderfs_minors);
-
-enum binderfs_param {
- Opt_max,
- Opt_stats_mode,
-};
-
-enum binderfs_stats_mode {
- binderfs_stats_mode_unset,
- binderfs_stats_mode_global,
-};
-
-struct binder_features {
- bool oneway_spam_detection;
- bool extended_error;
-};
-
-static const struct constant_table binderfs_param_stats[] = {
- { "global", binderfs_stats_mode_global },
- {}
-};
-
-static const struct fs_parameter_spec binderfs_fs_parameters[] = {
- fsparam_u32("max", Opt_max),
- fsparam_enum("stats", Opt_stats_mode, binderfs_param_stats),
- {}
-};
-
-static struct binder_features binder_features = {
- .oneway_spam_detection = true,
- .extended_error = true,
-};
-
-static inline struct binderfs_info *BINDERFS_SB(const struct super_block *sb)
-{
- return sb->s_fs_info;
-}
-
-bool is_binderfs_device(const struct inode *inode)
-{
- if (inode->i_sb->s_magic == BINDERFS_SUPER_MAGIC)
- return true;
-
- return false;
-}
-
-/**
- * binderfs_binder_device_create - allocate inode from super block of a
- * binderfs mount
- * @ref_inode: inode from wich the super block will be taken
- * @userp: buffer to copy information about new device for userspace to
- * @req: struct binderfs_device as copied from userspace
- *
- * This function allocates a new binder_device and reserves a new minor
- * number for it.
- * Minor numbers are limited and tracked globally in binderfs_minors. The
- * function will stash a struct binder_device for the specific binder
- * device in i_private of the inode.
- * It will go on to allocate a new inode from the super block of the
- * filesystem mount, stash a struct binder_device in its i_private field
- * and attach a dentry to that inode.
- *
- * Return: 0 on success, negative errno on failure
- */
-static int binderfs_binder_device_create(struct inode *ref_inode,
- struct binderfs_device __user *userp,
- struct binderfs_device *req)
-{
- int minor, ret;
- struct dentry *dentry, *root;
- struct binder_device *device;
- char *name = NULL;
- size_t name_len;
- struct inode *inode = NULL;
- struct super_block *sb = ref_inode->i_sb;
- struct binderfs_info *info = sb->s_fs_info;
-#if defined(CONFIG_IPC_NS)
- bool use_reserve = (info->ipc_ns == &init_ipc_ns);
-#else
- bool use_reserve = true;
-#endif
-
- /* Reserve new minor number for the new device. */
- mutex_lock(&binderfs_minors_mutex);
- if (++info->device_count <= info->mount_opts.max)
- minor = ida_alloc_max(&binderfs_minors,
- use_reserve ? BINDERFS_MAX_MINOR :
- BINDERFS_MAX_MINOR_CAPPED,
- GFP_KERNEL);
- else
- minor = -ENOSPC;
- if (minor < 0) {
- --info->device_count;
- mutex_unlock(&binderfs_minors_mutex);
- return minor;
- }
- mutex_unlock(&binderfs_minors_mutex);
-
- ret = -ENOMEM;
- device = kzalloc(sizeof(*device), GFP_KERNEL);
- if (!device)
- goto err;
-
- inode = new_inode(sb);
- if (!inode)
- goto err;
-
- inode->i_ino = minor + INODE_OFFSET;
- simple_inode_init_ts(inode);
- init_special_inode(inode, S_IFCHR | 0600,
- MKDEV(MAJOR(binderfs_dev), minor));
- inode->i_fop = &binder_fops;
- inode->i_uid = info->root_uid;
- inode->i_gid = info->root_gid;
-
- req->name[BINDERFS_MAX_NAME] = '\0'; /* NUL-terminate */
- name_len = strlen(req->name);
- /* Make sure to include terminating NUL byte */
- name = kmemdup(req->name, name_len + 1, GFP_KERNEL);
- if (!name)
- goto err;
-
- refcount_set(&device->ref, 1);
- device->binderfs_inode = inode;
- device->context.binder_context_mgr_uid = INVALID_UID;
- device->context.name = name;
- device->miscdev.name = name;
- device->miscdev.minor = minor;
- mutex_init(&device->context.context_mgr_node_lock);
-
- req->major = MAJOR(binderfs_dev);
- req->minor = minor;
-
- if (userp && copy_to_user(userp, req, sizeof(*req))) {
- ret = -EFAULT;
- goto err;
- }
-
- root = sb->s_root;
- inode_lock(d_inode(root));
-
- /* look it up */
- dentry = lookup_one_len(name, root, name_len);
- if (IS_ERR(dentry)) {
- inode_unlock(d_inode(root));
- ret = PTR_ERR(dentry);
- goto err;
- }
-
- if (d_really_is_positive(dentry)) {
- /* already exists */
- dput(dentry);
- inode_unlock(d_inode(root));
- ret = -EEXIST;
- goto err;
- }
-
- inode->i_private = device;
- d_instantiate(dentry, inode);
- fsnotify_create(root->d_inode, dentry);
- inode_unlock(d_inode(root));
-
- return 0;
-
-err:
- kfree(name);
- kfree(device);
- mutex_lock(&binderfs_minors_mutex);
- --info->device_count;
- ida_free(&binderfs_minors, minor);
- mutex_unlock(&binderfs_minors_mutex);
- iput(inode);
-
- return ret;
-}
-
-/**
- * binder_ctl_ioctl - handle binder device node allocation requests
- *
- * The request handler for the binder-control device. All requests operate on
- * the binderfs mount the binder-control device resides in:
- * - BINDER_CTL_ADD
- * Allocate a new binder device.
- *
- * Return: %0 on success, negative errno on failure.
- */
-static long binder_ctl_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- int ret = -EINVAL;
- struct inode *inode = file_inode(file);
- struct binderfs_device __user *device = (struct binderfs_device __user *)arg;
- struct binderfs_device device_req;
-
- switch (cmd) {
- case BINDER_CTL_ADD:
- ret = copy_from_user(&device_req, device, sizeof(device_req));
- if (ret) {
- ret = -EFAULT;
- break;
- }
-
- ret = binderfs_binder_device_create(inode, device, &device_req);
- break;
- default:
- break;
- }
-
- return ret;
-}
-
-static void binderfs_evict_inode(struct inode *inode)
-{
- struct binder_device *device = inode->i_private;
- struct binderfs_info *info = BINDERFS_SB(inode->i_sb);
-
- clear_inode(inode);
-
- if (!S_ISCHR(inode->i_mode) || !device)
- return;
-
- mutex_lock(&binderfs_minors_mutex);
- --info->device_count;
- ida_free(&binderfs_minors, device->miscdev.minor);
- mutex_unlock(&binderfs_minors_mutex);
-
- if (refcount_dec_and_test(&device->ref)) {
- kfree(device->context.name);
- kfree(device);
- }
-}
-
-static int binderfs_fs_context_parse_param(struct fs_context *fc,
- struct fs_parameter *param)
-{
- int opt;
- struct binderfs_mount_opts *ctx = fc->fs_private;
- struct fs_parse_result result;
-
- opt = fs_parse(fc, binderfs_fs_parameters, param, &result);
- if (opt < 0)
- return opt;
-
- switch (opt) {
- case Opt_max:
- if (result.uint_32 > BINDERFS_MAX_MINOR)
- return invalfc(fc, "Bad value for '%s'", param->key);
-
- ctx->max = result.uint_32;
- break;
- case Opt_stats_mode:
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- ctx->stats_mode = result.uint_32;
- break;
- default:
- return invalfc(fc, "Unsupported parameter '%s'", param->key);
- }
-
- return 0;
-}
-
-static int binderfs_fs_context_reconfigure(struct fs_context *fc)
-{
- struct binderfs_mount_opts *ctx = fc->fs_private;
- struct binderfs_info *info = BINDERFS_SB(fc->root->d_sb);
-
- if (info->mount_opts.stats_mode != ctx->stats_mode)
- return invalfc(fc, "Binderfs stats mode cannot be changed during a remount");
-
- info->mount_opts.stats_mode = ctx->stats_mode;
- info->mount_opts.max = ctx->max;
- return 0;
-}
-
-static int binderfs_show_options(struct seq_file *seq, struct dentry *root)
-{
- struct binderfs_info *info = BINDERFS_SB(root->d_sb);
-
- if (info->mount_opts.max <= BINDERFS_MAX_MINOR)
- seq_printf(seq, ",max=%d", info->mount_opts.max);
-
- switch (info->mount_opts.stats_mode) {
- case binderfs_stats_mode_unset:
- break;
- case binderfs_stats_mode_global:
- seq_printf(seq, ",stats=global");
- break;
- }
-
- return 0;
-}
-
-static const struct super_operations binderfs_super_ops = {
- .evict_inode = binderfs_evict_inode,
- .show_options = binderfs_show_options,
- .statfs = simple_statfs,
-};
-
-static inline bool is_binderfs_control_device(const struct dentry *dentry)
-{
- struct binderfs_info *info = dentry->d_sb->s_fs_info;
-
- return info->control_dentry == dentry;
-}
-
-static int binderfs_rename(struct mnt_idmap *idmap,
- struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry,
- unsigned int flags)
-{
- if (is_binderfs_control_device(old_dentry) ||
- is_binderfs_control_device(new_dentry))
- return -EPERM;
-
- return simple_rename(idmap, old_dir, old_dentry, new_dir,
- new_dentry, flags);
-}
-
-static int binderfs_unlink(struct inode *dir, struct dentry *dentry)
-{
- if (is_binderfs_control_device(dentry))
- return -EPERM;
-
- return simple_unlink(dir, dentry);
-}
-
-static const struct file_operations binder_ctl_fops = {
- .owner = THIS_MODULE,
- .open = nonseekable_open,
- .unlocked_ioctl = binder_ctl_ioctl,
- .compat_ioctl = binder_ctl_ioctl,
- .llseek = noop_llseek,
-};
-
-/**
- * binderfs_binder_ctl_create - create a new binder-control device
- * @sb: super block of the binderfs mount
- *
- * This function creates a new binder-control device node in the binderfs mount
- * referred to by @sb.
- *
- * Return: 0 on success, negative errno on failure
- */
-static int binderfs_binder_ctl_create(struct super_block *sb)
-{
- int minor, ret;
- struct dentry *dentry;
- struct binder_device *device;
- struct inode *inode = NULL;
- struct dentry *root = sb->s_root;
- struct binderfs_info *info = sb->s_fs_info;
-#if defined(CONFIG_IPC_NS)
- bool use_reserve = (info->ipc_ns == &init_ipc_ns);
-#else
- bool use_reserve = true;
-#endif
-
- device = kzalloc(sizeof(*device), GFP_KERNEL);
- if (!device)
- return -ENOMEM;
-
- /* If we have already created a binder-control node, return. */
- if (info->control_dentry) {
- ret = 0;
- goto out;
- }
-
- ret = -ENOMEM;
- inode = new_inode(sb);
- if (!inode)
- goto out;
-
- /* Reserve a new minor number for the new device. */
- mutex_lock(&binderfs_minors_mutex);
- minor = ida_alloc_max(&binderfs_minors,
- use_reserve ? BINDERFS_MAX_MINOR :
- BINDERFS_MAX_MINOR_CAPPED,
- GFP_KERNEL);
- mutex_unlock(&binderfs_minors_mutex);
- if (minor < 0) {
- ret = minor;
- goto out;
- }
-
- inode->i_ino = SECOND_INODE;
- simple_inode_init_ts(inode);
- init_special_inode(inode, S_IFCHR | 0600,
- MKDEV(MAJOR(binderfs_dev), minor));
- inode->i_fop = &binder_ctl_fops;
- inode->i_uid = info->root_uid;
- inode->i_gid = info->root_gid;
-
- refcount_set(&device->ref, 1);
- device->binderfs_inode = inode;
- device->miscdev.minor = minor;
-
- dentry = d_alloc_name(root, "binder-control");
- if (!dentry)
- goto out;
-
- inode->i_private = device;
- info->control_dentry = dentry;
- d_add(dentry, inode);
-
- return 0;
-
-out:
- kfree(device);
- iput(inode);
-
- return ret;
-}
-
-static const struct inode_operations binderfs_dir_inode_operations = {
- .lookup = simple_lookup,
- .rename = binderfs_rename,
- .unlink = binderfs_unlink,
-};
-
-static struct inode *binderfs_make_inode(struct super_block *sb, int mode)
-{
- struct inode *ret;
-
- ret = new_inode(sb);
- if (ret) {
- ret->i_ino = iunique(sb, BINDERFS_MAX_MINOR + INODE_OFFSET);
- ret->i_mode = mode;
- simple_inode_init_ts(ret);
- }
- return ret;
-}
-
-static struct dentry *binderfs_create_dentry(struct dentry *parent,
- const char *name)
-{
- struct dentry *dentry;
-
- dentry = lookup_one_len(name, parent, strlen(name));
- if (IS_ERR(dentry))
- return dentry;
-
- /* Return error if the file/dir already exists. */
- if (d_really_is_positive(dentry)) {
- dput(dentry);
- return ERR_PTR(-EEXIST);
- }
-
- return dentry;
-}
-
-void binderfs_remove_file(struct dentry *dentry)
-{
- struct inode *parent_inode;
-
- parent_inode = d_inode(dentry->d_parent);
- inode_lock(parent_inode);
- if (simple_positive(dentry)) {
- dget(dentry);
- simple_unlink(parent_inode, dentry);
- d_delete(dentry);
- dput(dentry);
- }
- inode_unlock(parent_inode);
-}
-
-struct dentry *binderfs_create_file(struct dentry *parent, const char *name,
- const struct file_operations *fops,
- void *data)
-{
- struct dentry *dentry;
- struct inode *new_inode, *parent_inode;
- struct super_block *sb;
-
- parent_inode = d_inode(parent);
- inode_lock(parent_inode);
-
- dentry = binderfs_create_dentry(parent, name);
- if (IS_ERR(dentry))
- goto out;
-
- sb = parent_inode->i_sb;
- new_inode = binderfs_make_inode(sb, S_IFREG | 0444);
- if (!new_inode) {
- dput(dentry);
- dentry = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- new_inode->i_fop = fops;
- new_inode->i_private = data;
- d_instantiate(dentry, new_inode);
- fsnotify_create(parent_inode, dentry);
-
-out:
- inode_unlock(parent_inode);
- return dentry;
-}
-
-static struct dentry *binderfs_create_dir(struct dentry *parent,
- const char *name)
-{
- struct dentry *dentry;
- struct inode *new_inode, *parent_inode;
- struct super_block *sb;
-
- parent_inode = d_inode(parent);
- inode_lock(parent_inode);
-
- dentry = binderfs_create_dentry(parent, name);
- if (IS_ERR(dentry))
- goto out;
-
- sb = parent_inode->i_sb;
- new_inode = binderfs_make_inode(sb, S_IFDIR | 0755);
- if (!new_inode) {
- dput(dentry);
- dentry = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- new_inode->i_fop = &simple_dir_operations;
- new_inode->i_op = &simple_dir_inode_operations;
-
- set_nlink(new_inode, 2);
- d_instantiate(dentry, new_inode);
- inc_nlink(parent_inode);
- fsnotify_mkdir(parent_inode, dentry);
-
-out:
- inode_unlock(parent_inode);
- return dentry;
-}
-
-static int binder_features_show(struct seq_file *m, void *unused)
-{
- bool *feature = m->private;
-
- seq_printf(m, "%d\n", *feature);
-
- return 0;
-}
-DEFINE_SHOW_ATTRIBUTE(binder_features);
-
-static int init_binder_features(struct super_block *sb)
-{
- struct dentry *dentry, *dir;
-
- dir = binderfs_create_dir(sb->s_root, "features");
- if (IS_ERR(dir))
- return PTR_ERR(dir);
-
- dentry = binderfs_create_file(dir, "oneway_spam_detection",
- &binder_features_fops,
- &binder_features.oneway_spam_detection);
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
-
- dentry = binderfs_create_file(dir, "extended_error",
- &binder_features_fops,
- &binder_features.extended_error);
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
-
- return 0;
-}
-
-static int init_binder_logs(struct super_block *sb)
-{
- struct dentry *binder_logs_root_dir, *dentry, *proc_log_dir;
- const struct binder_debugfs_entry *db_entry;
- struct binderfs_info *info;
- int ret = 0;
-
- binder_logs_root_dir = binderfs_create_dir(sb->s_root,
- "binder_logs");
- if (IS_ERR(binder_logs_root_dir)) {
- ret = PTR_ERR(binder_logs_root_dir);
- goto out;
- }
-
- binder_for_each_debugfs_entry(db_entry) {
- dentry = binderfs_create_file(binder_logs_root_dir,
- db_entry->name,
- db_entry->fops,
- db_entry->data);
- if (IS_ERR(dentry)) {
- ret = PTR_ERR(dentry);
- goto out;
- }
- }
-
- proc_log_dir = binderfs_create_dir(binder_logs_root_dir, "proc");
- if (IS_ERR(proc_log_dir)) {
- ret = PTR_ERR(proc_log_dir);
- goto out;
- }
- info = sb->s_fs_info;
- info->proc_log_dir = proc_log_dir;
-
-out:
- return ret;
-}
-
-static int binderfs_fill_super(struct super_block *sb, struct fs_context *fc)
-{
- int ret;
- struct binderfs_info *info;
- struct binderfs_mount_opts *ctx = fc->fs_private;
- struct inode *inode = NULL;
- struct binderfs_device device_info = {};
- const char *name;
- size_t len;
-
- sb->s_blocksize = PAGE_SIZE;
- sb->s_blocksize_bits = PAGE_SHIFT;
-
- /*
- * The binderfs filesystem can be mounted by userns root in a
- * non-initial userns. By default such mounts have the SB_I_NODEV flag
- * set in s_iflags to prevent security issues where userns root can
- * just create random device nodes via mknod() since it owns the
- * filesystem mount. But binderfs does not allow to create any files
- * including devices nodes. The only way to create binder devices nodes
- * is through the binder-control device which userns root is explicitly
- * allowed to do. So removing the SB_I_NODEV flag from s_iflags is both
- * necessary and safe.
- */
- sb->s_iflags &= ~SB_I_NODEV;
- sb->s_iflags |= SB_I_NOEXEC;
- sb->s_magic = BINDERFS_SUPER_MAGIC;
- sb->s_op = &binderfs_super_ops;
- sb->s_time_gran = 1;
-
- sb->s_fs_info = kzalloc(sizeof(struct binderfs_info), GFP_KERNEL);
- if (!sb->s_fs_info)
- return -ENOMEM;
- info = sb->s_fs_info;
-
- info->ipc_ns = get_ipc_ns(current->nsproxy->ipc_ns);
-
- info->root_gid = make_kgid(sb->s_user_ns, 0);
- if (!gid_valid(info->root_gid))
- info->root_gid = GLOBAL_ROOT_GID;
- info->root_uid = make_kuid(sb->s_user_ns, 0);
- if (!uid_valid(info->root_uid))
- info->root_uid = GLOBAL_ROOT_UID;
- info->mount_opts.max = ctx->max;
- info->mount_opts.stats_mode = ctx->stats_mode;
-
- inode = new_inode(sb);
- if (!inode)
- return -ENOMEM;
-
- inode->i_ino = FIRST_INODE;
- inode->i_fop = &simple_dir_operations;
- inode->i_mode = S_IFDIR | 0755;
- simple_inode_init_ts(inode);
- inode->i_op = &binderfs_dir_inode_operations;
- set_nlink(inode, 2);
-
- sb->s_root = d_make_root(inode);
- if (!sb->s_root)
- return -ENOMEM;
-
- ret = binderfs_binder_ctl_create(sb);
- if (ret)
- return ret;
-
- name = binder_devices_param;
- for (len = strcspn(name, ","); len > 0; len = strcspn(name, ",")) {
- strscpy(device_info.name, name, len + 1);
- ret = binderfs_binder_device_create(inode, NULL, &device_info);
- if (ret)
- return ret;
- name += len;
- if (*name == ',')
- name++;
- }
-
- ret = init_binder_features(sb);
- if (ret)
- return ret;
-
- if (info->mount_opts.stats_mode == binderfs_stats_mode_global)
- return init_binder_logs(sb);
-
- return 0;
-}
-
-static int binderfs_fs_context_get_tree(struct fs_context *fc)
-{
- return get_tree_nodev(fc, binderfs_fill_super);
-}
-
-static void binderfs_fs_context_free(struct fs_context *fc)
-{
- struct binderfs_mount_opts *ctx = fc->fs_private;
-
- kfree(ctx);
-}
-
-static const struct fs_context_operations binderfs_fs_context_ops = {
- .free = binderfs_fs_context_free,
- .get_tree = binderfs_fs_context_get_tree,
- .parse_param = binderfs_fs_context_parse_param,
- .reconfigure = binderfs_fs_context_reconfigure,
-};
-
-static int binderfs_init_fs_context(struct fs_context *fc)
-{
- struct binderfs_mount_opts *ctx;
-
- ctx = kzalloc(sizeof(struct binderfs_mount_opts), GFP_KERNEL);
- if (!ctx)
- return -ENOMEM;
-
- ctx->max = BINDERFS_MAX_MINOR;
- ctx->stats_mode = binderfs_stats_mode_unset;
-
- fc->fs_private = ctx;
- fc->ops = &binderfs_fs_context_ops;
-
- return 0;
-}
-
-static void binderfs_kill_super(struct super_block *sb)
-{
- struct binderfs_info *info = sb->s_fs_info;
-
- /*
- * During inode eviction struct binderfs_info is needed.
- * So first wipe the super_block then free struct binderfs_info.
- */
- kill_litter_super(sb);
-
- if (info && info->ipc_ns)
- put_ipc_ns(info->ipc_ns);
-
- kfree(info);
-}
-
-static struct file_system_type binder_fs_type = {
- .name = "binder",
- .init_fs_context = binderfs_init_fs_context,
- .parameters = binderfs_fs_parameters,
- .kill_sb = binderfs_kill_super,
- .fs_flags = FS_USERNS_MOUNT,
-};
-
-int __init init_binderfs(void)
-{
- int ret;
- const char *name;
- size_t len;
-
- /* Verify that the default binderfs device names are valid. */
- name = binder_devices_param;
- for (len = strcspn(name, ","); len > 0; len = strcspn(name, ",")) {
- if (len > BINDERFS_MAX_NAME)
- return -E2BIG;
- name += len;
- if (*name == ',')
- name++;
- }
-
- /* Allocate new major number for binderfs. */
- ret = alloc_chrdev_region(&binderfs_dev, 0, BINDERFS_MAX_MINOR,
- "binder");
- if (ret)
- return ret;
-
- ret = register_filesystem(&binder_fs_type);
- if (ret) {
- unregister_chrdev_region(binderfs_dev, BINDERFS_MAX_MINOR);
- return ret;
- }
-
- return ret;
-}

--
2.42.0.820.g83a721a137-goog

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