[PATCH v2 5/5] binder: additional transaction error logs
From: Carlos Llamas
Date: Fri Apr 29 2022 - 19:57:22 EST
Log readable and specific error messages whenever a transaction failure
happens. This will ensure better context is given to regular users about
these unique error cases, without having to decode a cryptic log.
Signed-off-by: Carlos Llamas <cmllamas@xxxxxxxxxx>
---
drivers/android/binder.c | 48 ++++++++++++++++++++++++++++++++++++----
1 file changed, 44 insertions(+), 4 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index bfb21e258427..d7c5e2dde270 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -147,6 +147,9 @@ static __printf(2, 3) void binder_debug(int mask, const char *format, ...)
}
}
+#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;
@@ -2823,6 +2826,8 @@ static void binder_transaction(struct binder_proc *proc,
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;
@@ -2888,6 +2893,8 @@ static void binder_transaction(struct binder_proc *proc,
}
}
if (!target_node) {
+ binder_txn_error("%d:%d cannot find target node\n",
+ thread->pid, proc->pid);
/*
* return_error is set above
*/
@@ -2897,6 +2904,8 @@ static void binder_transaction(struct binder_proc *proc,
}
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__;
@@ -2904,6 +2913,8 @@ static void binder_transaction(struct binder_proc *proc,
}
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__;
@@ -2975,6 +2986,8 @@ static void binder_transaction(struct binder_proc *proc,
/* 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__;
@@ -2986,6 +2999,8 @@ static void binder_transaction(struct binder_proc *proc,
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__;
@@ -3032,6 +3047,8 @@ static void binder_transaction(struct binder_proc *proc,
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__;
@@ -3040,7 +3057,8 @@ static void binder_transaction(struct binder_proc *proc,
added_size = ALIGN(secctx_sz, sizeof(u64));
extra_buffers_size += added_size;
if (extra_buffers_size < added_size) {
- /* integer overflow of extra_buffers_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__;
@@ -3054,9 +3072,15 @@ static void binder_transaction(struct binder_proc *proc,
tr->offsets_size, extra_buffers_size,
!reply && (t->flags & TF_ONE_WAY), current->tgid);
if (IS_ERR(t->buffer)) {
- /*
- * -ESRCH indicates VMA cleared. The target is dying.
- */
+ 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;
@@ -3139,6 +3163,8 @@ static void binder_transaction(struct binder_proc *proc,
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__;
@@ -3197,6 +3223,8 @@ static void binder_transaction(struct binder_proc *proc,
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__;
@@ -3214,6 +3242,8 @@ static void binder_transaction(struct binder_proc *proc,
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__;
@@ -3234,6 +3264,8 @@ static void binder_transaction(struct binder_proc *proc,
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__;
@@ -3303,6 +3335,8 @@ static void binder_transaction(struct binder_proc *proc,
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__;
@@ -3330,6 +3364,8 @@ static void binder_transaction(struct binder_proc *proc,
(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__;
@@ -3353,6 +3389,8 @@ static void binder_transaction(struct binder_proc *proc,
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__;
@@ -3460,6 +3498,8 @@ static void binder_transaction(struct binder_proc *proc,
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:
--
2.36.0.464.gb9c8b46e94-goog