[RFC PATCH v3 10/11] selftest mm/mseal memory sealing
From: jeffxu
Date: Tue Dec 12 2023 - 18:17:57 EST
From: Jeff Xu <jeffxu@xxxxxxxxxxxx>
selftest for memory sealing change in mmap() and mseal().
Signed-off-by: Jeff Xu <jeffxu@xxxxxxxxxxxx>
---
tools/testing/selftests/mm/.gitignore | 1 +
tools/testing/selftests/mm/Makefile | 1 +
tools/testing/selftests/mm/config | 1 +
tools/testing/selftests/mm/mseal_test.c | 2141 +++++++++++++++++++++++
4 files changed, 2144 insertions(+)
create mode 100644 tools/testing/selftests/mm/mseal_test.c
diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore
index cdc9ce4426b9..f0f22a649985 100644
--- a/tools/testing/selftests/mm/.gitignore
+++ b/tools/testing/selftests/mm/.gitignore
@@ -43,3 +43,4 @@ mdwe_test
gup_longterm
mkdirty
va_high_addr_switch
+mseal_test
diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index 6a9fc5693145..0c086cecc093 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -59,6 +59,7 @@ TEST_GEN_FILES += mlock2-tests
TEST_GEN_FILES += mrelease_test
TEST_GEN_FILES += mremap_dontunmap
TEST_GEN_FILES += mremap_test
+TEST_GEN_FILES += mseal_test
TEST_GEN_FILES += on-fault-limit
TEST_GEN_FILES += thuge-gen
TEST_GEN_FILES += transhuge-stress
diff --git a/tools/testing/selftests/mm/config b/tools/testing/selftests/mm/config
index be087c4bc396..cf2b8780e9b1 100644
--- a/tools/testing/selftests/mm/config
+++ b/tools/testing/selftests/mm/config
@@ -6,3 +6,4 @@ CONFIG_TEST_HMM=m
CONFIG_GUP_TEST=y
CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_MEM_SOFT_DIRTY=y
+CONFIG_MSEAL=y
diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
new file mode 100644
index 000000000000..0692485d8b3c
--- /dev/null
+++ b/tools/testing/selftests/mm/mseal_test.c
@@ -0,0 +1,2141 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <sys/mman.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <stdbool.h>
+#include "../kselftest.h"
+#include <syscall.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <sys/ioctl.h>
+#include <sys/vfs.h>
+#include <sys/stat.h>
+
+/*
+ * need those definition for manually build using gcc.
+ * gcc -I ../../../../usr/include -DDEBUG -O3 -DDEBUG -O3 mseal_test.c -o mseal_test
+ */
+#ifndef MM_SEAL_SEAL
+#define MM_SEAL_SEAL 0x1
+#endif
+
+#ifndef MM_SEAL_BASE
+#define MM_SEAL_BASE 0x2
+#endif
+
+#ifndef MM_SEAL_PROT_PKEY
+#define MM_SEAL_PROT_PKEY 0x4
+#endif
+
+#ifndef MM_SEAL_DISCARD_RO_ANON
+#define MM_SEAL_DISCARD_RO_ANON 0x8
+#endif
+
+#ifndef MAP_SEALABLE
+#define MAP_SEALABLE 0x8000000
+#endif
+
+#ifndef PROT_SEAL_SEAL
+#define PROT_SEAL_SEAL 0x04000000
+#endif
+
+#ifndef PROT_SEAL_BASE
+#define PROT_SEAL_BASE 0x08000000
+#endif
+
+#ifndef PROT_SEAL_PROT_PKEY
+#define PROT_SEAL_PROT_PKEY 0x10000000
+#endif
+
+#ifndef PROT_SEAL_DISCARD_RO_ANON
+#define PROT_SEAL_DISCARD_RO_ANON 0x20000000
+#endif
+
+#ifndef PKEY_DISABLE_ACCESS
+# define PKEY_DISABLE_ACCESS 0x1
+#endif
+
+#ifndef PKEY_DISABLE_WRITE
+# define PKEY_DISABLE_WRITE 0x2
+#endif
+
+#ifndef PKEY_BITS_PER_KEY
+#define PKEY_BITS_PER_PKEY 2
+#endif
+
+#ifndef PKEY_MASK
+#define PKEY_MASK (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE)
+#endif
+
+#ifndef DEBUG
+#define LOG_TEST_ENTER() {}
+#else
+#define LOG_TEST_ENTER() {ksft_print_msg("%s\n", __func__); }
+#endif
+
+#ifndef u64
+#define u64 unsigned long long
+#endif
+
+/*
+ * define sys_xyx to call syscall directly.
+ */
+static int sys_mseal(void *start, size_t len, int types)
+{
+ int sret;
+
+ errno = 0;
+ sret = syscall(__NR_mseal, start, len, types, 0);
+ return sret;
+}
+
+int sys_mprotect(void *ptr, size_t size, unsigned long prot)
+{
+ int sret;
+
+ errno = 0;
+ sret = syscall(SYS_mprotect, ptr, size, prot);
+ return sret;
+}
+
+int sys_mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
+ unsigned long pkey)
+{
+ int sret;
+
+ errno = 0;
+ sret = syscall(__NR_pkey_mprotect, ptr, size, orig_prot, pkey);
+ return sret;
+}
+
+int sys_munmap(void *ptr, size_t size)
+{
+ int sret;
+
+ errno = 0;
+ sret = syscall(SYS_munmap, ptr, size);
+ return sret;
+}
+
+static int sys_madvise(void *start, size_t len, int types)
+{
+ int sret;
+
+ errno = 0;
+ sret = syscall(__NR_madvise, start, len, types);
+ return sret;
+}
+
+int sys_pkey_alloc(unsigned long flags, unsigned long init_val)
+{
+ int ret = syscall(SYS_pkey_alloc, flags, init_val);
+ return ret;
+}
+
+static inline unsigned int __read_pkey_reg(void)
+{
+ unsigned int eax, edx;
+ unsigned int ecx = 0;
+ unsigned int pkey_reg;
+
+ asm volatile(".byte 0x0f,0x01,0xee\n\t"
+ : "=a" (eax), "=d" (edx)
+ : "c" (ecx));
+ pkey_reg = eax;
+ return pkey_reg;
+}
+
+static inline void __write_pkey_reg(u64 pkey_reg)
+{
+ unsigned int eax = pkey_reg;
+ unsigned int ecx = 0;
+ unsigned int edx = 0;
+
+ asm volatile(".byte 0x0f,0x01,0xef\n\t"
+ : : "a" (eax), "c" (ecx), "d" (edx));
+ assert(pkey_reg == __read_pkey_reg());
+}
+
+static inline unsigned long pkey_bit_position(int pkey)
+{
+ return pkey * PKEY_BITS_PER_PKEY;
+}
+
+static inline u64 set_pkey_bits(u64 reg, int pkey, u64 flags)
+{
+ unsigned long shift = pkey_bit_position(pkey);
+ /* mask out bits from pkey in old value */
+ reg &= ~((u64)PKEY_MASK << shift);
+ /* OR in new bits for pkey */
+ reg |= (flags & PKEY_MASK) << shift;
+ return reg;
+}
+
+static inline void set_pkey(int pkey, unsigned long pkey_value)
+{
+ unsigned long mask = (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE);
+ u64 new_pkey_reg;
+
+ assert(!(pkey_value & ~mask));
+ new_pkey_reg = set_pkey_bits(__read_pkey_reg(), pkey, pkey_value);
+ __write_pkey_reg(new_pkey_reg);
+}
+
+void setup_single_address(int size, void **ptrOut)
+{
+ void *ptr;
+
+ ptr = mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE | MAP_SEALABLE, -1, 0);
+ assert(ptr != (void *)-1);
+ *ptrOut = ptr;
+}
+
+void setup_single_address_sealable(int size, void **ptrOut, bool sealable)
+{
+ void *ptr;
+ unsigned long mapflags = MAP_ANONYMOUS | MAP_PRIVATE;
+
+ if (sealable)
+ mapflags |= MAP_SEALABLE;
+
+ ptr = mmap(NULL, size, PROT_READ, mapflags, -1, 0);
+ assert(ptr != (void *)-1);
+ *ptrOut = ptr;
+}
+
+void setup_single_address_rw_sealable(int size, void **ptrOut, bool sealable)
+{
+ void *ptr;
+ unsigned long mapflags = MAP_ANONYMOUS | MAP_PRIVATE;
+
+ if (sealable)
+ mapflags |= MAP_SEALABLE;
+
+ ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, mapflags, -1, 0);
+ assert(ptr != (void *)-1);
+ *ptrOut = ptr;
+}
+
+void clean_single_address(void *ptr, int size)
+{
+ int ret;
+
+ ret = munmap(ptr, size);
+ assert(!ret);
+}
+
+void seal_mprotect_single_address(void *ptr, int size)
+{
+ int ret;
+
+ ret = sys_mseal(ptr, size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+}
+
+void seal_discard_ro_anon_single_address(void *ptr, int size)
+{
+ int ret;
+
+ ret = sys_mseal(ptr, size, MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+}
+
+static void test_seal_addseals(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ /* adding seal one by one */
+
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ ret = sys_mseal(ptr, size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+ ret = sys_mseal(ptr, size, MM_SEAL_SEAL);
+ assert(!ret);
+}
+
+static void test_seal_addseals_combined(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+
+ /* adding multiple seals */
+ ret = sys_mseal(ptr, size,
+ MM_SEAL_PROT_PKEY | MM_SEAL_BASE|
+ MM_SEAL_SEAL);
+ assert(!ret);
+
+ /* not adding more seal type, so ok. */
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+
+ /* not adding more seal type, so ok. */
+ ret = sys_mseal(ptr, size, MM_SEAL_SEAL);
+ assert(!ret);
+}
+
+static void test_seal_addseals_reject(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE | MM_SEAL_SEAL);
+ assert(!ret);
+
+ /* MM_SEAL_SEAL is set, so not allow new seal type . */
+ ret = sys_mseal(ptr, size,
+ MM_SEAL_PROT_PKEY | MM_SEAL_BASE | MM_SEAL_SEAL);
+ assert(ret < 0);
+}
+
+static void test_seal_unmapped_start(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ // munmap 2 pages from ptr.
+ ret = sys_munmap(ptr, 2 * page_size);
+ assert(!ret);
+
+ // mprotect will fail because 2 pages from ptr are unmapped.
+ ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+ assert(ret < 0);
+
+ // mseal will fail because 2 pages from ptr are unmapped.
+ ret = sys_mseal(ptr, size, MM_SEAL_SEAL);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr + 2 * page_size, 2 * page_size, MM_SEAL_SEAL);
+ assert(!ret);
+}
+
+static void test_seal_unmapped_middle(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ // munmap 2 pages from ptr + page.
+ ret = sys_munmap(ptr + page_size, 2 * page_size);
+ assert(!ret);
+
+ // mprotect will fail, since size is 4 pages.
+ ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+ assert(ret < 0);
+
+ // mseal will fail as well.
+ ret = sys_mseal(ptr, size, MM_SEAL_SEAL);
+ assert(ret < 0);
+
+ /* we still can add seal to the first page and last page*/
+ ret = sys_mseal(ptr, page_size, MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(!ret);
+
+ ret = sys_mseal(ptr + 3 * page_size, page_size,
+ MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(!ret);
+}
+
+static void test_seal_unmapped_end(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ // unmap last 2 pages.
+ ret = sys_munmap(ptr + 2 * page_size, 2 * page_size);
+ assert(!ret);
+
+ //mprotect will fail since last 2 pages are unmapped.
+ ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+ assert(ret < 0);
+
+ //mseal will fail as well.
+ ret = sys_mseal(ptr, size, MM_SEAL_SEAL);
+ assert(ret < 0);
+
+ /* The first 2 pages is not sealed, and can add seals */
+ ret = sys_mseal(ptr, 2 * page_size, MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(!ret);
+}
+
+static void test_seal_multiple_vmas(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ // use mprotect to split the vma into 3.
+ ret = sys_mprotect(ptr + page_size, 2 * page_size,
+ PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ // mprotect will get applied to all 4 pages - 3 VMAs.
+ ret = sys_mprotect(ptr, size, PROT_READ);
+ assert(!ret);
+
+ // use mprotect to split the vma into 3.
+ ret = sys_mprotect(ptr + page_size, 2 * page_size,
+ PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ // mseal get applied to all 4 pages - 3 VMAs.
+ ret = sys_mseal(ptr, size, MM_SEAL_SEAL);
+ assert(!ret);
+
+ // verify additional seal type will fail after MM_SEAL_SEAL set.
+ ret = sys_mseal(ptr, page_size, MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr + page_size, 2 * page_size,
+ MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr + 3 * page_size, page_size,
+ MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(ret < 0);
+}
+
+static void test_seal_split_start(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ /* use mprotect to split at middle */
+ ret = sys_mprotect(ptr, 2 * page_size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ /* seal the first page, this will split the VMA */
+ ret = sys_mseal(ptr, page_size, MM_SEAL_SEAL);
+ assert(!ret);
+
+ /* can't add seal to the first page */
+ ret = sys_mseal(ptr, page_size, MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(ret < 0);
+
+ /* add seal to the remain 3 pages */
+ ret = sys_mseal(ptr + page_size, 3 * page_size,
+ MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(!ret);
+}
+
+static void test_seal_split_end(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ /* use mprotect to split at middle */
+ ret = sys_mprotect(ptr, 2 * page_size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ /* seal the last page */
+ ret = sys_mseal(ptr + 3 * page_size, page_size, MM_SEAL_SEAL);
+ assert(!ret);
+
+ /* adding seal to the last page is rejected. */
+ ret = sys_mseal(ptr + 3 * page_size, page_size,
+ MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(ret < 0);
+
+ /* Adding seals to the first 3 pages */
+ ret = sys_mseal(ptr, 3 * page_size, MM_SEAL_SEAL | MM_SEAL_PROT_PKEY);
+ assert(!ret);
+}
+
+static void test_seal_invalid_input(void)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(8 * page_size, &ptr);
+ clean_single_address(ptr + 4 * page_size, 4 * page_size);
+
+ /* invalid flag */
+ ret = sys_mseal(ptr, size, 0x20);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr, size, 0x31);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr, size, 0x3F);
+ assert(ret < 0);
+
+ /* unaligned address */
+ ret = sys_mseal(ptr + 1, 2 * page_size, MM_SEAL_SEAL);
+ assert(ret < 0);
+
+ /* length too big */
+ ret = sys_mseal(ptr, 5 * page_size, MM_SEAL_SEAL);
+ assert(ret < 0);
+
+ /* start is not in a valid VMA */
+ ret = sys_mseal(ptr - page_size, 5 * page_size, MM_SEAL_SEAL);
+ assert(ret < 0);
+}
+
+static void test_seal_zero_length(void)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ ret = sys_mprotect(ptr, 0, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ /* seal 0 length will be OK, same as mprotect */
+ ret = sys_mseal(ptr, 0, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+
+ // verify the 4 pages are not sealed by previous call.
+ ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+}
+
+static void test_seal_twice(void)
+{
+ LOG_TEST_ENTER();
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ setup_single_address(size, &ptr);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+
+ // apply the same seal will be OK. idempotent.
+ ret = sys_mseal(ptr, size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size,
+ MM_SEAL_PROT_PKEY | MM_SEAL_BASE |
+ MM_SEAL_SEAL);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size,
+ MM_SEAL_PROT_PKEY | MM_SEAL_BASE |
+ MM_SEAL_SEAL);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_SEAL);
+ assert(!ret);
+}
+
+static void test_seal_mprotect(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ if (seal)
+ seal_mprotect_single_address(ptr, size);
+
+ ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+static void test_seal_start_mprotect(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ if (seal)
+ seal_mprotect_single_address(ptr, page_size);
+
+ // the first page is sealed.
+ ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ // pages after the first page is not sealed.
+ ret = sys_mprotect(ptr + page_size, page_size * 3,
+ PROT_READ | PROT_WRITE);
+ assert(!ret);
+}
+
+static void test_seal_end_mprotect(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ if (seal)
+ seal_mprotect_single_address(ptr + page_size, 3 * page_size);
+
+ /* first page is not sealed */
+ ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ /* last 3 page are sealed */
+ ret = sys_mprotect(ptr + page_size, page_size * 3,
+ PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+static void test_seal_mprotect_unalign_len(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ if (seal)
+ seal_mprotect_single_address(ptr, page_size * 2 - 1);
+
+ // 2 pages are sealed.
+ ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ ret = sys_mprotect(ptr + page_size * 2, page_size,
+ PROT_READ | PROT_WRITE);
+ assert(!ret);
+}
+
+static void test_seal_mprotect_unalign_len_variant_2(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+ if (seal)
+ seal_mprotect_single_address(ptr, page_size * 2 + 1);
+
+ // 3 pages are sealed.
+ ret = sys_mprotect(ptr, page_size * 3, PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ ret = sys_mprotect(ptr + page_size * 3, page_size,
+ PROT_READ | PROT_WRITE);
+ assert(!ret);
+}
+
+static void test_seal_mprotect_two_vma(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ /* use mprotect to split */
+ ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ if (seal)
+ seal_mprotect_single_address(ptr, page_size * 4);
+
+ ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ ret = sys_mprotect(ptr + page_size * 2, page_size * 2,
+ PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+static void test_seal_mprotect_two_vma_with_split(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ // use mprotect to split as two vma.
+ ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ // mseal can apply across 2 vma, also split them.
+ if (seal)
+ seal_mprotect_single_address(ptr + page_size, page_size * 2);
+
+ // the first page is not sealed.
+ ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ // the second page is sealed.
+ ret = sys_mprotect(ptr + page_size, page_size, PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ // the third page is sealed.
+ ret = sys_mprotect(ptr + 2 * page_size, page_size,
+ PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ // the fouth page is not sealed.
+ ret = sys_mprotect(ptr + 3 * page_size, page_size,
+ PROT_READ | PROT_WRITE);
+ assert(!ret);
+}
+
+static void test_seal_mprotect_partial_mprotect(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ // seal one page.
+ if (seal)
+ seal_mprotect_single_address(ptr, page_size);
+
+ // mprotect first 2 page will fail, since the first page are sealed.
+ ret = sys_mprotect(ptr, 2 * page_size, PROT_READ | PROT_WRITE);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+static void test_seal_mprotect_two_vma_with_gap(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ // use mprotect to split.
+ ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ // use mprotect to split.
+ ret = sys_mprotect(ptr + 3 * page_size, page_size,
+ PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ // use munmap to free two pages in the middle
+ ret = sys_munmap(ptr + page_size, 2 * page_size);
+ assert(!ret);
+
+ // mprotect will fail, because there is a gap in the address.
+ // notes, internally mprotect still updated the first page.
+ ret = sys_mprotect(ptr, 4 * page_size, PROT_READ);
+ assert(ret < 0);
+
+ // mseal will fail as well.
+ ret = sys_mseal(ptr, 4 * page_size, MM_SEAL_PROT_PKEY);
+ assert(ret < 0);
+
+ // unlike mprotect, the first page is not sealed.
+ ret = sys_mprotect(ptr, page_size, PROT_READ);
+ assert(ret == 0);
+
+ // the last page is not sealed.
+ ret = sys_mprotect(ptr + 3 * page_size, page_size, PROT_READ);
+ assert(ret == 0);
+}
+
+static void test_seal_mprotect_split(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ //use mprotect to split.
+ ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ //seal all 4 pages.
+ if (seal) {
+ ret = sys_mseal(ptr, 4 * page_size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+ }
+
+ //madvice is OK.
+ ret = sys_madvise(ptr, page_size * 2, MADV_WILLNEED);
+ assert(!ret);
+
+ //mprotect is sealed.
+ ret = sys_mprotect(ptr, 2 * page_size, PROT_READ);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+
+ ret = sys_mprotect(ptr + 2 * page_size, 2 * page_size, PROT_READ);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+static void test_seal_mprotect_merge(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ // use mprotect to split one page.
+ ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ // seal first two pages.
+ if (seal) {
+ ret = sys_mseal(ptr, 2 * page_size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+ }
+
+ ret = sys_madvise(ptr, page_size, MADV_WILLNEED);
+ assert(!ret);
+
+ // 2 pages are sealed.
+ ret = sys_mprotect(ptr, 2 * page_size, PROT_READ);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ // last 2 pages are not sealed.
+ ret = sys_mprotect(ptr + 2 * page_size, 2 * page_size, PROT_READ);
+ assert(ret == 0);
+}
+
+static void test_seal_munmap(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // 4 pages are sealed.
+ ret = sys_munmap(ptr, size);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+/*
+ * allocate 4 pages,
+ * use mprotect to split it as two VMAs
+ * seal the whole range
+ * munmap will fail on both
+ */
+static void test_seal_munmap_two_vma(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ /* use mprotect to split */
+ ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ ret = sys_munmap(ptr, page_size * 2);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ ret = sys_munmap(ptr + page_size, page_size * 2);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+/*
+ * allocate a VMA with 4 pages.
+ * munmap the middle 2 pages.
+ * seal the whole 4 pages, will fail.
+ * note: one of the pages are sealed
+ * munmap the first page will be OK.
+ * munmap the last page will be OK.
+ */
+static void test_seal_munmap_vma_with_gap(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ ret = sys_munmap(ptr + page_size, page_size * 2);
+ assert(!ret);
+
+ if (seal) {
+ // can't have gap in the middle.
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(ret < 0);
+ }
+
+ ret = sys_munmap(ptr, page_size);
+ assert(!ret);
+
+ ret = sys_munmap(ptr + page_size * 2, page_size);
+ assert(!ret);
+
+ ret = sys_munmap(ptr, size);
+ assert(!ret);
+}
+
+static void test_munmap_start_freed(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ // unmap the first page.
+ ret = sys_munmap(ptr, page_size);
+ assert(!ret);
+
+ // seal the last 3 pages.
+ if (seal) {
+ ret = sys_mseal(ptr + page_size, 3 * page_size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // unmap from the first page.
+ ret = sys_munmap(ptr, size);
+ if (seal) {
+ assert(ret < 0);
+
+ // use mprotect to verify page is not unmapped.
+ ret = sys_mprotect(ptr + page_size, 3 * page_size, PROT_READ);
+ assert(!ret);
+ } else
+ // note: this will be OK, even the first page is
+ // already unmapped.
+ assert(!ret);
+}
+
+static void test_munmap_end_freed(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+ // unmap last page.
+ ret = sys_munmap(ptr + page_size * 3, page_size);
+ assert(!ret);
+
+ // seal the first 3 pages.
+ if (seal) {
+ ret = sys_mseal(ptr, 3 * page_size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // unmap all pages.
+ ret = sys_munmap(ptr, size);
+ if (seal) {
+ assert(ret < 0);
+
+ // use mprotect to verify page is not unmapped.
+ ret = sys_mprotect(ptr, 3 * page_size, PROT_READ);
+ assert(!ret);
+ } else
+ assert(!ret);
+}
+
+static void test_munmap_middle_freed(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+ // unmap 2 pages in the middle.
+ ret = sys_munmap(ptr + page_size, page_size * 2);
+ assert(!ret);
+
+ // seal the first page.
+ if (seal) {
+ ret = sys_mseal(ptr, page_size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // munmap all 4 pages.
+ ret = sys_munmap(ptr, size);
+ if (seal) {
+ assert(ret < 0);
+
+ // use mprotect to verify page is not unmapped.
+ ret = sys_mprotect(ptr, page_size, PROT_READ);
+ assert(!ret);
+ } else
+ assert(!ret);
+}
+
+void test_seal_mremap_shrink(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // shrink from 4 pages to 2 pages.
+ ret2 = mremap(ptr, size, 2 * page_size, 0, 0);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else {
+ assert(ret2 != MAP_FAILED);
+
+ }
+}
+
+void test_seal_mremap_expand(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+ // ummap last 2 pages.
+ ret = sys_munmap(ptr + 2 * page_size, 2 * page_size);
+ assert(!ret);
+
+ if (seal) {
+ ret = sys_mseal(ptr, 2 * page_size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // expand from 2 page to 4 pages.
+ ret2 = mremap(ptr, 2 * page_size, 4 * page_size, 0, 0);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else {
+ assert(ret2 == ptr);
+
+ }
+}
+
+void test_seal_mremap_move(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr, *newPtr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+ setup_single_address(size, &newPtr);
+ clean_single_address(newPtr, size);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // move from ptr to fixed address.
+ ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newPtr);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else {
+ assert(ret2 != MAP_FAILED);
+
+ }
+}
+
+void test_seal_mmap_overwrite_prot(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // use mmap to change protection.
+ ret2 = mmap(ptr, size, PROT_NONE,
+ MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else
+ assert(ret2 == ptr);
+}
+
+void test_seal_mmap_expand(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 12 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+ // ummap last 4 pages.
+ ret = sys_munmap(ptr + 8 * page_size, 4 * page_size);
+ assert(!ret);
+
+ if (seal) {
+ ret = sys_mseal(ptr, 8 * page_size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // use mmap to expand.
+ ret2 = mmap(ptr, size, PROT_READ,
+ MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else
+ assert(ret2 == ptr);
+}
+
+void test_seal_mmap_shrink(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 12 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // use mmap to shrink.
+ ret2 = mmap(ptr, 8 * page_size, PROT_READ,
+ MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else
+ assert(ret2 == ptr);
+}
+
+void test_seal_mremap_shrink_fixed(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ void *newAddr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+ setup_single_address(size, &newAddr);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // mremap to move and shrink to fixed address
+ ret2 = mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
+ newAddr);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else
+ assert(ret2 == newAddr);
+}
+
+void test_seal_mremap_expand_fixed(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ void *newAddr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(page_size, &ptr);
+ setup_single_address(size, &newAddr);
+
+ if (seal) {
+ ret = sys_mseal(newAddr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // mremap to move and expand to fixed address
+ ret2 = mremap(ptr, page_size, size, MREMAP_MAYMOVE | MREMAP_FIXED,
+ newAddr);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else
+ assert(ret2 == newAddr);
+}
+
+void test_seal_mremap_move_fixed(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ void *newAddr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+ setup_single_address(size, &newAddr);
+
+ if (seal) {
+ ret = sys_mseal(newAddr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // mremap to move to fixed address
+ ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newAddr);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else
+ assert(ret2 == newAddr);
+}
+
+void test_seal_mremap_move_fixed_zero(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ void *newAddr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ /*
+ * MREMAP_FIXED can move the mapping to zero address
+ */
+ ret2 = mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
+ 0);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else {
+ assert(ret2 == 0);
+
+ }
+}
+
+void test_seal_mremap_move_dontunmap(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ void *newAddr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ // mremap to move, and don't unmap src addr.
+ ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, 0);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else {
+ assert(ret2 != MAP_FAILED);
+
+ }
+}
+
+void test_seal_mremap_move_dontunmap_anyaddr(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ void *newAddr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ setup_single_address(size, &ptr);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(!ret);
+ }
+
+ /*
+ * The 0xdeaddead should not have effect on dest addr
+ * when MREMAP_DONTUNMAP is set.
+ */
+ ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP,
+ 0xdeaddead);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else {
+ assert(ret2 != MAP_FAILED);
+ assert((long)ret2 != 0xdeaddead);
+
+ }
+}
+
+unsigned long get_vma_size(void *addr)
+{
+ FILE *maps;
+ char line[256];
+ int size = 0;
+ uintptr_t addr_start, addr_end;
+
+ maps = fopen("/proc/self/maps", "r");
+ if (!maps)
+ return 0;
+
+ while (fgets(line, sizeof(line), maps)) {
+ if (sscanf(line, "%lx-%lx", &addr_start, &addr_end) == 2) {
+ if (addr_start == (uintptr_t) addr) {
+ size = addr_end - addr_start;
+ break;
+ }
+ }
+ }
+ fclose(maps);
+ return size;
+}
+
+void test_seal_mmap_seal_base(void)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ ptr = mmap(NULL, size, PROT_READ | PROT_SEAL_BASE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ assert(ptr != (void *)-1);
+
+ ret = sys_munmap(ptr, size);
+ assert(ret < 0);
+
+ ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+
+ ret = sys_mprotect(ptr, size, PROT_READ);
+ assert(ret < 0);
+}
+
+void test_seal_mmap_seal_mprotect(void)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ ptr = mmap(NULL, size, PROT_READ | PROT_SEAL_PROT_PKEY, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ assert(ptr != (void *)-1);
+
+ ret = sys_munmap(ptr, size);
+ assert(ret < 0);
+
+ ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+ assert(ret < 0);
+}
+
+void test_seal_mmap_seal_mseal(void)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ void *ret2;
+
+ ptr = mmap(NULL, size, PROT_READ | PROT_SEAL_SEAL, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ assert(ptr != (void *)-1);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_BASE);
+ assert(ret < 0);
+
+ ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ ret = sys_munmap(ptr, size);
+ assert(!ret);
+}
+
+void test_seal_merge_and_split(void)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size;
+ int ret;
+ void *ret2;
+
+ // (24 RO)
+ setup_single_address(24 * page_size, &ptr);
+
+ // use mprotect(NONE) to set out boundary
+ // (1 NONE) (22 RO) (1 NONE)
+ ret = sys_mprotect(ptr, page_size, PROT_NONE);
+ assert(!ret);
+ ret = sys_mprotect(ptr + 23 * page_size, page_size, PROT_NONE);
+ assert(!ret);
+ size = get_vma_size(ptr + page_size);
+ assert(size == 22 * page_size);
+
+ // use mseal to split from beginning
+ // (1 NONE) (1 RO_SBASE) (21 RO) (1 NONE)
+ ret = sys_mseal(ptr + page_size, page_size, MM_SEAL_BASE);
+ assert(!ret);
+ size = get_vma_size(ptr + page_size);
+ assert(size == page_size);
+ size = get_vma_size(ptr + 2 * page_size);
+ assert(size == 21 * page_size);
+
+ // use mseal to split from the end.
+ // (1 NONE) (1 RO_SBASE) (20 RO) (1 RO_SBASE) (1 NONE)
+ ret = sys_mseal(ptr + 22 * page_size, page_size, MM_SEAL_BASE);
+ assert(!ret);
+ size = get_vma_size(ptr + 22 * page_size);
+ assert(size == page_size);
+ size = get_vma_size(ptr + 2 * page_size);
+ assert(size == 20 * page_size);
+
+ // merge with prev.
+ // (1 NONE) (2 RO_SBASE) (19 RO) (1 RO_SBASE) (1 NONE)
+ ret = sys_mseal(ptr + 2 * page_size, page_size, MM_SEAL_BASE);
+ assert(!ret);
+ size = get_vma_size(ptr + page_size);
+ assert(size == 2 * page_size);
+
+ // merge with after.
+ // (1 NONE) (2 RO_SBASE) (18 RO) (2 RO_SBASES) (1 NONE)
+ ret = sys_mseal(ptr + 21 * page_size, page_size, MM_SEAL_BASE);
+ assert(!ret);
+ size = get_vma_size(ptr + 21 * page_size);
+ assert(size == 2 * page_size);
+
+ // split from prev
+ // (1 NONE) (1 RO_SBASE) (2RO_SPROT) (17 RO) (2 RO_SBASES) (1 NONE)
+ ret = sys_mseal(ptr + 2 * page_size, 2 * page_size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+ size = get_vma_size(ptr + 2 * page_size);
+ assert(size == 2 * page_size);
+ ret = sys_munmap(ptr + page_size, page_size);
+ assert(ret < 0);
+ ret = sys_mprotect(ptr + 2 * page_size, page_size, PROT_NONE);
+ assert(ret < 0);
+
+ // split from next
+ // (1 NONE) (1 RO_SBASE) (2 RO_SPROT) (16 RO) (2 RO_SPROT) (1 RO_SBASES) (1 NONE)
+ ret = sys_mseal(ptr + 20 * page_size, 2 * page_size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+ size = get_vma_size(ptr + 20 * page_size);
+ assert(size == 2 * page_size);
+
+ // merge from middle of prev and middle of next.
+ // (1 NONE) (1 RW_SBASE) (20 RO_SPROT) (1 RW_SBASES) (1 NONE)
+ ret = sys_mseal(ptr + 3 * page_size, 18 * page_size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+ size = get_vma_size(ptr + 2 * page_size);
+ assert(size == 20 * page_size);
+
+ size = get_vma_size(ptr + 22 * page_size);
+ assert(size == page_size);
+
+ size = get_vma_size(ptr + 23 * page_size);
+ assert(size == page_size);
+
+ // Add split using SEAL_ALL
+ // (1 NONE) (1 RW_SBASE) (1 RO_SALL) (18 RO_SPROT) (1 RO_SALL) (1 RW_SBASES) (1 NONE)
+ ret = sys_mseal(ptr + 2 * page_size, page_size,
+ MM_SEAL_PROT_PKEY | MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+ size = get_vma_size(ptr + 2 * page_size);
+ assert(size == 1 * page_size);
+
+ ret = sys_mseal(ptr + 21 * page_size, page_size,
+ MM_SEAL_PROT_PKEY | MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+ size = get_vma_size(ptr + 21 * page_size);
+ assert(size == 1 * page_size);
+
+ // add a new seal type, and merge with next
+ // (1 NONE) (2 RO_SALL) (18 RO_SPROT) (2 RO_SALL) (1 NONE)
+ ret = sys_mprotect(ptr + page_size, page_size, PROT_READ);
+ assert(!ret);
+ ret = sys_mseal(ptr + page_size, page_size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+ ret = sys_mseal(ptr + page_size, page_size, MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+ size = get_vma_size(ptr + page_size);
+ assert(size == 2 * page_size);
+
+ ret = sys_mprotect(ptr + 22 * page_size, page_size, PROT_READ);
+ assert(!ret);
+ ret = sys_mseal(ptr + 22 * page_size, page_size, MM_SEAL_PROT_PKEY);
+ assert(!ret);
+ ret = sys_mseal(ptr + 22 * page_size, page_size, MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+ size = get_vma_size(ptr + page_size);
+ assert(size == 2 * page_size);
+}
+
+void test_seal_mmap_merge(void)
+{
+ LOG_TEST_ENTER();
+
+ void *ptr, *ptr2;
+ unsigned long page_size = getpagesize();
+ unsigned long size;
+ int ret;
+ void *ret2;
+
+ // (24 RO)
+ setup_single_address(24 * page_size, &ptr);
+
+ // use mprotect(NONE) to set out boundary
+ // (1 NONE) (22 RO) (1 NONE)
+ ret = sys_mprotect(ptr, page_size, PROT_NONE);
+ assert(!ret);
+ ret = sys_mprotect(ptr + 23 * page_size, page_size, PROT_NONE);
+ assert(!ret);
+ size = get_vma_size(ptr + page_size);
+ assert(size == 22 * page_size);
+
+ // use munmap to free 2 segment of memory.
+ // (1 NONE) (1 free) (20 RO) (1 free) (1 NONE)
+ ret = sys_munmap(ptr + page_size, page_size);
+ assert(!ret);
+
+ ret = sys_munmap(ptr + 22 * page_size, page_size);
+ assert(!ret);
+
+ // apply seal to the middle
+ // (1 NONE) (1 free) (20 RO_SBASE) (1 free) (1 NONE)
+ ret = sys_mseal(ptr + 2 * page_size, 20 * page_size, MM_SEAL_BASE);
+ assert(!ret);
+ size = get_vma_size(ptr + 2 * page_size);
+ assert(size == 20 * page_size);
+
+ // allocate a mapping at beginning, and make sure it merges.
+ // (1 NONE) (21 RO_SBASE) (1 free) (1 NONE)
+ ptr2 = mmap(ptr + page_size, page_size, PROT_READ | PROT_SEAL_BASE,
+ MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ assert(ptr != (void *)-1);
+ size = get_vma_size(ptr + page_size);
+ assert(size == 21 * page_size);
+
+ // allocate a mapping at end, and make sure it merges.
+ // (1 NONE) (22 RO_SBASE) (1 NONE)
+ ptr2 = mmap(ptr + 22 * page_size, page_size, PROT_READ | PROT_SEAL_BASE,
+ MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ assert(ptr != (void *)-1);
+ size = get_vma_size(ptr + page_size);
+ assert(size == 22 * page_size);
+}
+
+static void test_not_sealable(void)
+{
+ int ret;
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+
+ ptr = mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ assert(ptr != (void *)-1);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_SEAL);
+ assert(ret < 0);
+}
+
+static void test_merge_sealable(void)
+{
+ int ret;
+ void *ptr, *ptr2;
+ unsigned long page_size = getpagesize();
+ unsigned long size;
+
+ // (24 RO)
+ setup_single_address(24 * page_size, &ptr);
+
+ // use mprotect(NONE) to set out boundary
+ // (1 NONE) (22 RO) (1 NONE)
+ ret = sys_mprotect(ptr, page_size, PROT_NONE);
+ assert(!ret);
+ ret = sys_mprotect(ptr + 23 * page_size, page_size, PROT_NONE);
+ assert(!ret);
+ size = get_vma_size(ptr + page_size);
+ assert(size == 22 * page_size);
+
+ // (1 NONE) (RO) (4 free) (17 RO) (1 NONE)
+ ret = sys_munmap(ptr + 2 * page_size, 4 * page_size);
+ assert(!ret);
+ size = get_vma_size(ptr + page_size);
+ assert(size == 1 * page_size);
+ size = get_vma_size(ptr + 6 * page_size);
+ assert(size == 17 * page_size);
+
+ // (1 NONE) (RO) (1 free) (2 RO) (1 free) (17 RO) (1 NONE)
+ ptr2 = mmap(ptr + 3 * page_size, 2 * page_size, PROT_READ,
+ MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE | MAP_SEALABLE, -1, 0);
+ size = get_vma_size(ptr + 3 * page_size);
+ assert(size == 2 * page_size);
+
+ // (1 NONE) (RO) (1 free) (20 RO) (1 NONE)
+ ptr2 = mmap(ptr + 5 * page_size, 1 * page_size, PROT_READ,
+ MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE | MAP_SEALABLE, -1, 0);
+ assert(ptr2 != (void *)-1);
+ size = get_vma_size(ptr + 3 * page_size);
+ assert(size == 20 * page_size);
+
+ // (1 NONE) (RO) (1 free) (19 RO) (1 RO_SB) (1 NONE)
+ ret = sys_mseal(ptr + 22 * page_size, page_size, MM_SEAL_BASE);
+ assert(!ret);
+
+ // (1 NONE) (RO) (not sealable) (19 RO) (1 RO_SB) (1 NONE)
+ ptr2 = mmap(ptr + 2 * page_size, page_size, PROT_READ,
+ MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ assert(ptr2 != (void *)-1);
+ size = get_vma_size(ptr + page_size);
+ assert(size == page_size);
+ size = get_vma_size(ptr + 2 * page_size);
+ assert(size == page_size);
+}
+
+static void test_seal_discard_ro_anon_on_rw(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address_rw_sealable(size, &ptr, seal);
+ assert(ptr != (void *)-1);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+ }
+
+ // sealing doesn't take effect on RW memory.
+ ret = sys_madvise(ptr, size, MADV_DONTNEED);
+ assert(!ret);
+
+ // base seal still apply.
+ ret = sys_munmap(ptr, size);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+static void test_seal_discard_ro_anon_on_pkey(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ int pkey;
+
+ setup_single_address_rw_sealable(size, &ptr, seal);
+ assert(ptr != (void *)-1);
+
+ pkey = sys_pkey_alloc(0, 0);
+ assert(pkey > 0);
+
+ ret = sys_mprotect_pkey((void *)ptr, size, PROT_READ | PROT_WRITE, pkey);
+ assert(!ret);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+ }
+
+ // sealing doesn't take effect if PKRU allow write.
+ set_pkey(pkey, 0);
+ ret = sys_madvise(ptr, size, MADV_DONTNEED);
+ assert(!ret);
+
+ // sealing will take effect if PKRU deny write.
+ set_pkey(pkey, PKEY_DISABLE_WRITE);
+ ret = sys_madvise(ptr, size, MADV_DONTNEED);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ // base seal still apply.
+ ret = sys_munmap(ptr, size);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+static void test_seal_discard_ro_anon_on_filebacked(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ int fd;
+ unsigned long mapflags = MAP_PRIVATE;
+
+ if (seal)
+ mapflags |= MAP_SEALABLE;
+
+ fd = memfd_create("test", 0);
+ assert(fd > 0);
+
+ ret = fallocate(fd, 0, 0, size);
+ assert(!ret);
+
+ ptr = mmap(NULL, size, PROT_READ, mapflags, fd, 0);
+ assert(ptr != MAP_FAILED);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+ }
+
+ // sealing doesn't apply for file backed mapping.
+ ret = sys_madvise(ptr, size, MADV_DONTNEED);
+ assert(!ret);
+
+ ret = sys_munmap(ptr, size);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+ close(fd);
+}
+
+static void test_seal_discard_ro_anon_on_shared(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ unsigned long mapflags = MAP_ANONYMOUS | MAP_SHARED;
+
+ if (seal)
+ mapflags |= MAP_SEALABLE;
+
+ ptr = mmap(NULL, size, PROT_READ, mapflags, -1, 0);
+ assert(ptr != (void *)-1);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+ }
+
+ // sealing doesn't apply for shared mapping.
+ ret = sys_madvise(ptr, size, MADV_DONTNEED);
+ assert(!ret);
+
+ ret = sys_munmap(ptr, size);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+static void test_seal_discard_ro_anon_invalid_shared(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+ int fd;
+
+ fd = open("/proc/self/maps", O_RDONLY);
+ ptr = mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, fd, 0);
+ assert(ptr != (void *)-1);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_DISCARD_RO_ANON);
+ assert(!ret);
+ }
+
+ ret = sys_madvise(ptr, size, MADV_DONTNEED);
+ assert(!ret);
+
+ ret = sys_munmap(ptr, size);
+ assert(ret < 0);
+ close(fd);
+}
+
+static void test_seal_discard_ro_anon(bool seal)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+
+ if (seal)
+ seal_discard_ro_anon_single_address(ptr, size);
+
+ ret = sys_madvise(ptr, size, MADV_DONTNEED);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+
+ ret = sys_munmap(ptr, size);
+ if (seal)
+ assert(ret < 0);
+ else
+ assert(!ret);
+}
+
+static void test_mmap_seal_discard_ro_anon(void)
+{
+ LOG_TEST_ENTER();
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ ptr = mmap(NULL, size, PROT_READ | PROT_WRITE | PROT_SEAL_DISCARD_RO_ANON,
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ assert(ptr != (void *)-1);
+
+ ret = sys_mprotect(ptr, size, PROT_READ);
+ assert(!ret);
+
+ ret = sys_madvise(ptr, size, MADV_DONTNEED);
+ assert(ret < 0);
+
+ ret = sys_munmap(ptr, size);
+ assert(ret < 0);
+}
+
+bool seal_support(void)
+{
+ void *ptr;
+ unsigned long page_size = getpagesize();
+
+ ptr = mmap(NULL, page_size, PROT_READ | PROT_SEAL_BASE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ if (ptr == (void *) -1)
+ return false;
+ return true;
+}
+
+bool pkey_supported(void)
+{
+ int pkey = sys_pkey_alloc(0, 0);
+
+ if (pkey > 0)
+ return true;
+ return false;
+}
+
+int main(int argc, char **argv)
+{
+ bool test_seal = seal_support();
+
+ if (!test_seal) {
+ ksft_print_msg("%s CONFIG_MSEAL might be disabled, skip test\n", __func__);
+ return 0;
+ }
+
+ test_seal_invalid_input();
+ test_seal_addseals();
+ test_seal_addseals_combined();
+ test_seal_addseals_reject();
+ test_seal_unmapped_start();
+ test_seal_unmapped_middle();
+ test_seal_unmapped_end();
+ test_seal_multiple_vmas();
+ test_seal_split_start();
+ test_seal_split_end();
+
+ test_seal_zero_length();
+ test_seal_twice();
+
+ test_seal_mprotect(false);
+ test_seal_mprotect(true);
+
+ test_seal_start_mprotect(false);
+ test_seal_start_mprotect(true);
+
+ test_seal_end_mprotect(false);
+ test_seal_end_mprotect(true);
+
+ test_seal_mprotect_unalign_len(false);
+ test_seal_mprotect_unalign_len(true);
+
+ test_seal_mprotect_unalign_len_variant_2(false);
+ test_seal_mprotect_unalign_len_variant_2(true);
+
+ test_seal_mprotect_two_vma(false);
+ test_seal_mprotect_two_vma(true);
+
+ test_seal_mprotect_two_vma_with_split(false);
+ test_seal_mprotect_two_vma_with_split(true);
+
+ test_seal_mprotect_partial_mprotect(false);
+ test_seal_mprotect_partial_mprotect(true);
+
+ test_seal_mprotect_two_vma_with_gap(false);
+ test_seal_mprotect_two_vma_with_gap(true);
+
+ test_seal_mprotect_merge(false);
+ test_seal_mprotect_merge(true);
+
+ test_seal_mprotect_split(false);
+ test_seal_mprotect_split(true);
+
+ test_seal_munmap(false);
+ test_seal_munmap(true);
+ test_seal_munmap_two_vma(false);
+ test_seal_munmap_two_vma(true);
+ test_seal_munmap_vma_with_gap(false);
+ test_seal_munmap_vma_with_gap(true);
+
+ test_munmap_start_freed(false);
+ test_munmap_start_freed(true);
+ test_munmap_middle_freed(false);
+ test_munmap_middle_freed(true);
+ test_munmap_end_freed(false);
+ test_munmap_end_freed(true);
+
+ test_seal_mremap_shrink(false);
+ test_seal_mremap_shrink(true);
+ test_seal_mremap_expand(false);
+ test_seal_mremap_expand(true);
+ test_seal_mremap_move(false);
+ test_seal_mremap_move(true);
+
+ test_seal_mremap_shrink_fixed(false);
+ test_seal_mremap_shrink_fixed(true);
+ test_seal_mremap_expand_fixed(false);
+ test_seal_mremap_expand_fixed(true);
+ test_seal_mremap_move_fixed(false);
+ test_seal_mremap_move_fixed(true);
+ test_seal_mremap_move_dontunmap(false);
+ test_seal_mremap_move_dontunmap(true);
+ test_seal_mremap_move_fixed_zero(false);
+ test_seal_mremap_move_fixed_zero(true);
+ test_seal_mremap_move_dontunmap_anyaddr(false);
+ test_seal_mremap_move_dontunmap_anyaddr(true);
+ test_seal_discard_ro_anon(false);
+ test_seal_discard_ro_anon(true);
+ test_seal_discard_ro_anon_on_rw(false);
+ test_seal_discard_ro_anon_on_rw(true);
+ test_seal_discard_ro_anon_on_shared(false);
+ test_seal_discard_ro_anon_on_shared(true);
+ test_seal_discard_ro_anon_on_filebacked(false);
+ test_seal_discard_ro_anon_on_filebacked(true);
+ test_seal_mmap_overwrite_prot(false);
+ test_seal_mmap_overwrite_prot(true);
+ test_seal_mmap_expand(false);
+ test_seal_mmap_expand(true);
+ test_seal_mmap_shrink(false);
+ test_seal_mmap_shrink(true);
+
+ test_seal_mmap_seal_base();
+ test_seal_mmap_seal_mprotect();
+ test_seal_mmap_seal_mseal();
+ test_mmap_seal_discard_ro_anon();
+ test_seal_merge_and_split();
+ test_seal_mmap_merge();
+
+ test_not_sealable();
+ test_merge_sealable();
+
+ if (pkey_supported()) {
+ test_seal_discard_ro_anon_on_pkey(false);
+ test_seal_discard_ro_anon_on_pkey(true);
+ }
+
+ ksft_print_msg("Done\n");
+ return 0;
+}
--
2.43.0.472.g3155946c3a-goog