selftest mm/mseal memory sealing

selftest for memory sealing change in mmap() and mseal().

Link: https://lkml.kernel.org/r/20240415163527.626541-4-jeffxu@chromium.org
Signed-off-by: Jeff Xu <jeffxu@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Jann Horn <jannh@google.com>
Cc: Jeff Xu <jeffxu@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Jorge Lucangeli Obes <jorgelo@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Pedro Falcato <pedro.falcato@gmail.com>
Cc: Stephen Röttger <sroettger@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Amer Al Shanawany <amer.shanawany@gmail.com>
Cc: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

3 files changed, 1838 insertions, 0 deletions

diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore
index d26e962f2ac4..98eaa4590f11 100644
--- a/tools/testing/selftests/mm/.gitignore
+++ b/tools/testing/selftests/mm/.gitignore
@@ -47,3 +47,4 @@ mkdirty
 va_high_addr_switch
 hugetlb_fault_after_madv
 hugetlb_madv_vs_map
+mseal_test
diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index 60b8feb6a5ec..3482b5aef984 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 += pagemap_ioctl
 TEST_GEN_FILES += thuge-gen
diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
new file mode 100644
index 000000000000..06c780d1d8e5
--- /dev/null
+++ b/tools/testing/selftests/mm/mseal_test.c
@@ -0,0 +1,1836 @@
+// 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 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
+
+#define FAIL_TEST_IF_FALSE(c) do {\
+		if (!(c)) {\
+			ksft_test_result_fail("%s, line:%d\n", __func__, __LINE__);\
+			goto test_end;\
+		} \
+	} \
+	while (0)
+
+#define SKIP_TEST_IF_FALSE(c) do {\
+		if (!(c)) {\
+			ksft_test_result_skip("%s, line:%d\n", __func__, __LINE__);\
+			goto test_end;\
+		} \
+	} \
+	while (0)
+
+
+#define TEST_END_CHECK() {\
+		ksft_test_result_pass("%s\n", __func__);\
+		return;\
+test_end:\
+		return;\
+}
+
+#ifndef u64
+#define u64 unsigned long long
+#endif
+
+static unsigned long get_vma_size(void *addr, int *prot)
+{
+	FILE *maps;
+	char line[256];
+	int size = 0;
+	uintptr_t  addr_start, addr_end;
+	char protstr[5];
+	*prot = 0;
+
+	maps = fopen("/proc/self/maps", "r");
+	if (!maps)
+		return 0;
+
+	while (fgets(line, sizeof(line), maps)) {
+		if (sscanf(line, "%lx-%lx %4s", &addr_start, &addr_end, &protstr) == 3) {
+			if (addr_start == (uintptr_t) addr) {
+				size = addr_end - addr_start;
+				if (protstr[0] == 'r')
+					*prot |= 0x4;
+				if (protstr[1] == 'w')
+					*prot |= 0x2;
+				if (protstr[2] == 'x')
+					*prot |= 0x1;
+				break;
+			}
+		}
+	}
+	fclose(maps);
+	return size;
+}
+
+/*
+ * define sys_xyx to call syscall directly.
+ */
+static int sys_mseal(void *start, size_t len)
+{
+	int sret;
+
+	errno = 0;
+	sret = syscall(__NR_mseal, start, len, 0);
+	return sret;
+}
+
+static int sys_mprotect(void *ptr, size_t size, unsigned long prot)
+{
+	int sret;
+
+	errno = 0;
+	sret = syscall(__NR_mprotect, ptr, size, prot);
+	return sret;
+}
+
+static 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;
+}
+
+static void *sys_mmap(void *addr, unsigned long len, unsigned long prot,
+	unsigned long flags, unsigned long fd, unsigned long offset)
+{
+	void *sret;
+
+	errno = 0;
+	sret = (void *) syscall(__NR_mmap, addr, len, prot,
+		flags, fd, offset);
+	return sret;
+}
+
+static int sys_munmap(void *ptr, size_t size)
+{
+	int sret;
+
+	errno = 0;
+	sret = syscall(__NR_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;
+}
+
+static int sys_pkey_alloc(unsigned long flags, unsigned long init_val)
+{
+	int ret = syscall(__NR_pkey_alloc, flags, init_val);
+
+	return ret;
+}
+
+static unsigned int __read_pkey_reg(void)
+{
+	unsigned int pkey_reg = 0;
+#if defined(__i386__) || defined(__x86_64__) /* arch */
+	unsigned int eax, edx;
+	unsigned int ecx = 0;
+
+	asm volatile(".byte 0x0f,0x01,0xee\n\t"
+			: "=a" (eax), "=d" (edx)
+			: "c" (ecx));
+	pkey_reg = eax;
+#endif
+	return pkey_reg;
+}
+
+static void __write_pkey_reg(u64 pkey_reg)
+{
+#if defined(__i386__) || defined(__x86_64__) /* arch */
+	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());
+#endif
+}
+
+static unsigned long pkey_bit_position(int pkey)
+{
+	return pkey * PKEY_BITS_PER_PKEY;
+}
+
+static 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 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);
+}
+
+static void setup_single_address(int size, void **ptrOut)
+{
+	void *ptr;
+
+	ptr = sys_mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	assert(ptr != (void *)-1);
+	*ptrOut = ptr;
+}
+
+static void setup_single_address_rw(int size, void **ptrOut)
+{
+	void *ptr;
+	unsigned long mapflags = MAP_ANONYMOUS | MAP_PRIVATE;
+
+	ptr = sys_mmap(NULL, size, PROT_READ | PROT_WRITE, mapflags, -1, 0);
+	assert(ptr != (void *)-1);
+	*ptrOut = ptr;
+}
+
+static void clean_single_address(void *ptr, int size)
+{
+	int ret;
+
+	ret = munmap(ptr, size);
+	assert(!ret);
+}
+
+static void seal_single_address(void *ptr, int size)
+{
+	int ret;
+
+	ret = sys_mseal(ptr, size);
+	assert(!ret);
+}
+
+bool seal_support(void)
+{
+	int ret;
+	void *ptr;
+	unsigned long page_size = getpagesize();
+
+	ptr = sys_mmap(NULL, page_size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	if (ptr == (void *) -1)
+		return false;
+
+	ret = sys_mseal(ptr, page_size);
+	if (ret < 0)
+		return false;
+
+	return true;
+}
+
+bool pkey_supported(void)
+{
+#if defined(__i386__) || defined(__x86_64__) /* arch */
+	int pkey = sys_pkey_alloc(0, 0);
+
+	if (pkey > 0)
+		return true;
+#endif
+	return false;
+}
+
+static void test_seal_addseal(void)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_unmapped_start(void)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* mprotect will fail because 2 pages from ptr are unmapped. */
+	ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* mseal will fail because 2 pages from ptr are unmapped. */
+	ret = sys_mseal(ptr, size);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	ret = sys_mseal(ptr + 2 * page_size, 2 * page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_unmapped_middle(void)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* mprotect will fail, since middle 2 pages are unmapped. */
+	ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* mseal will fail as well. */
+	ret = sys_mseal(ptr, size);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* we still can add seal to the first page and last page*/
+	ret = sys_mseal(ptr, page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	ret = sys_mseal(ptr + 3 * page_size, page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_unmapped_end(void)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* mprotect will fail since last 2 pages are unmapped. */
+	ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* mseal will fail as well. */
+	ret = sys_mseal(ptr, size);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* The first 2 pages is not sealed, and can add seals */
+	ret = sys_mseal(ptr, 2 * page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_multiple_vmas(void)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* mprotect will get applied to all 4 pages - 3 VMAs. */
+	ret = sys_mprotect(ptr, size, PROT_READ);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* use mprotect to split the vma into 3. */
+	ret = sys_mprotect(ptr + page_size, 2 * page_size,
+			PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* mseal get applied to all 4 pages - 3 VMAs. */
+	ret = sys_mseal(ptr, size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_split_start(void)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* seal the first page, this will split the VMA */
+	ret = sys_mseal(ptr, page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* add seal to the remain 3 pages */
+	ret = sys_mseal(ptr + page_size, 3 * page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_split_end(void)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* seal the last page */
+	ret = sys_mseal(ptr + 3 * page_size, page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* Adding seals to the first 3 pages */
+	ret = sys_mseal(ptr, 3 * page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_invalid_input(void)
+{
+	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 = syscall(__NR_mseal, ptr, size, 0x20);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* unaligned address */
+	ret = sys_mseal(ptr + 1, 2 * page_size);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* length too big */
+	ret = sys_mseal(ptr, 5 * page_size);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* length overflow */
+	ret = sys_mseal(ptr, UINT64_MAX/page_size);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* start is not in a valid VMA */
+	ret = sys_mseal(ptr - page_size, 5 * page_size);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_zero_length(void)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* seal 0 length will be OK, same as mprotect */
+	ret = sys_mseal(ptr, 0);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* verify the 4 pages are not sealed by previous call. */
+	ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_zero_address(void)
+{
+	void *ptr;
+	unsigned long page_size = getpagesize();
+	unsigned long size = 4 * page_size;
+	int ret;
+	int prot;
+
+	/* use mmap to change protection. */
+	ptr = sys_mmap(0, size, PROT_NONE,
+			MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+	FAIL_TEST_IF_FALSE(ptr == 0);
+
+	size = get_vma_size(ptr, &prot);
+	FAIL_TEST_IF_FALSE(size == 4 * page_size);
+
+	ret = sys_mseal(ptr, size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* verify the 4 pages are sealed by previous call. */
+	ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_twice(void)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* apply the same seal will be OK. idempotent. */
+	ret = sys_mseal(ptr, size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mprotect(bool seal)
+{
+	void *ptr;
+	unsigned long page_size = getpagesize();
+	unsigned long size = 4 * page_size;
+	int ret;
+
+	setup_single_address(size, &ptr);
+
+	if (seal)
+		seal_single_address(ptr, size);
+
+	ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_start_mprotect(bool seal)
+{
+	void *ptr;
+	unsigned long page_size = getpagesize();
+	unsigned long size = 4 * page_size;
+	int ret;
+
+	setup_single_address(size, &ptr);
+
+	if (seal)
+		seal_single_address(ptr, page_size);
+
+	/* the first page is sealed. */
+	ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	/* pages after the first page is not sealed. */
+	ret = sys_mprotect(ptr + page_size, page_size * 3,
+			PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_end_mprotect(bool seal)
+{
+	void *ptr;
+	unsigned long page_size = getpagesize();
+	unsigned long size = 4 * page_size;
+	int ret;
+
+	setup_single_address(size, &ptr);
+
+	if (seal)
+		seal_single_address(ptr + page_size, 3 * page_size);
+
+	/* first page is not sealed */
+	ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* last 3 page are sealed */
+	ret = sys_mprotect(ptr + page_size, page_size * 3,
+			PROT_READ | PROT_WRITE);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mprotect_unalign_len(bool seal)
+{
+	void *ptr;
+	unsigned long page_size = getpagesize();
+	unsigned long size = 4 * page_size;
+	int ret;
+
+	setup_single_address(size, &ptr);
+
+	if (seal)
+		seal_single_address(ptr, page_size * 2 - 1);
+
+	/* 2 pages are sealed. */
+	ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	ret = sys_mprotect(ptr + page_size * 2, page_size,
+			PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mprotect_unalign_len_variant_2(bool seal)
+{
+	void *ptr;
+	unsigned long page_size = getpagesize();
+	unsigned long size = 4 * page_size;
+	int ret;
+
+	setup_single_address(size, &ptr);
+	if (seal)
+		seal_single_address(ptr, page_size * 2 + 1);
+
+	/* 3 pages are sealed. */
+	ret = sys_mprotect(ptr, page_size * 3, PROT_READ | PROT_WRITE);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	ret = sys_mprotect(ptr + page_size * 3, page_size,
+			PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mprotect_two_vma(bool seal)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	if (seal)
+		seal_single_address(ptr, page_size * 4);
+
+	ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	ret = sys_mprotect(ptr + page_size * 2, page_size * 2,
+			PROT_READ | PROT_WRITE);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mprotect_two_vma_with_split(bool seal)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* mseal can apply across 2 vma, also split them. */
+	if (seal)
+		seal_single_address(ptr + page_size, page_size * 2);
+
+	/* the first page is not sealed. */
+	ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* the second page is sealed. */
+	ret = sys_mprotect(ptr + page_size, page_size, PROT_READ | PROT_WRITE);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	/* the third page is sealed. */
+	ret = sys_mprotect(ptr + 2 * page_size, page_size,
+			PROT_READ | PROT_WRITE);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	/* the fouth page is not sealed. */
+	ret = sys_mprotect(ptr + 3 * page_size, page_size,
+			PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mprotect_partial_mprotect(bool seal)
+{
+	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_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)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mprotect_two_vma_with_gap(bool seal)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* use mprotect to split. */
+	ret = sys_mprotect(ptr + 3 * page_size, page_size,
+			PROT_READ | PROT_WRITE);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* use munmap to free two pages in the middle */
+	ret = sys_munmap(ptr + page_size, 2 * page_size);
+	FAIL_TEST_IF_FALSE(!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);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* mseal will fail as well. */
+	ret = sys_mseal(ptr, 4 * page_size);
+	FAIL_TEST_IF_FALSE(ret < 0);
+
+	/* the first page is not sealed. */
+	ret = sys_mprotect(ptr, page_size, PROT_READ);
+	FAIL_TEST_IF_FALSE(ret == 0);
+
+	/* the last page is not sealed. */
+	ret = sys_mprotect(ptr + 3 * page_size, page_size, PROT_READ);
+	FAIL_TEST_IF_FALSE(ret == 0);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mprotect_split(bool seal)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* seal all 4 pages. */
+	if (seal) {
+		ret = sys_mseal(ptr, 4 * page_size);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	/* mprotect is sealed. */
+	ret = sys_mprotect(ptr, 2 * page_size, PROT_READ);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+
+	ret = sys_mprotect(ptr + 2 * page_size, 2 * page_size, PROT_READ);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mprotect_merge(bool seal)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* seal first two pages. */
+	if (seal) {
+		ret = sys_mseal(ptr, 2 * page_size);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	/* 2 pages are sealed. */
+	ret = sys_mprotect(ptr, 2 * page_size, PROT_READ);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	/* last 2 pages are not sealed. */
+	ret = sys_mprotect(ptr + 2 * page_size, 2 * page_size, PROT_READ);
+	FAIL_TEST_IF_FALSE(ret == 0);
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_munmap(bool seal)
+{
+	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);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	/* 4 pages are sealed. */
+	ret = sys_munmap(ptr, size);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+/*
+ * 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)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	if (seal) {
+		ret = sys_mseal(ptr, size);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	ret = sys_munmap(ptr, page_size * 2);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	ret = sys_munmap(ptr + page_size, page_size * 2);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+/*
+ * allocate a VMA with 4 pages.
+ * munmap the middle 2 pages.
+ * seal the whole 4 pages, will fail.
+ * munmap the first page will be OK.
+ * munmap the last page will be OK.
+ */
+static void test_seal_munmap_vma_with_gap(bool seal)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	if (seal) {
+		/* can't have gap in the middle. */
+		ret = sys_mseal(ptr, size);
+		FAIL_TEST_IF_FALSE(ret < 0);
+	}
+
+	ret = sys_munmap(ptr, page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	ret = sys_munmap(ptr + page_size * 2, page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	ret = sys_munmap(ptr, size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_munmap_start_freed(bool seal)
+{
+	void *ptr;
+	unsigned long page_size = getpagesize();
+	unsigned long size = 4 * page_size;
+	int ret;
+	int prot;
+
+	setup_single_address(size, &ptr);
+
+	/* unmap the first page. */
+	ret = sys_munmap(ptr, page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* seal the last 3 pages. */
+	if (seal) {
+		ret = sys_mseal(ptr + page_size, 3 * page_size);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	/* unmap from the first page. */
+	ret = sys_munmap(ptr, size);
+	if (seal) {
+		FAIL_TEST_IF_FALSE(ret < 0);
+
+		size = get_vma_size(ptr + page_size, &prot);
+		FAIL_TEST_IF_FALSE(size == page_size * 3);
+	} else {
+		/* note: this will be OK, even the first page is */
+		/* already unmapped. */
+		FAIL_TEST_IF_FALSE(!ret);
+
+		size = get_vma_size(ptr + page_size, &prot);
+		FAIL_TEST_IF_FALSE(size == 0);
+	}
+
+	TEST_END_CHECK();
+}
+
+static void test_munmap_end_freed(bool seal)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* seal the first 3 pages. */
+	if (seal) {
+		ret = sys_mseal(ptr, 3 * page_size);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	/* unmap all pages. */
+	ret = sys_munmap(ptr, size);
+	if (seal)
+		FAIL_TEST_IF_FALSE(ret < 0);
+	else
+		FAIL_TEST_IF_FALSE(!ret);
+
+	TEST_END_CHECK();
+}
+
+static void test_munmap_middle_freed(bool seal)
+{
+	void *ptr;
+	unsigned long page_size = getpagesize();
+	unsigned long size = 4 * page_size;
+	int ret;
+	int prot;
+
+	setup_single_address(size, &ptr);
+	/* unmap 2 pages in the middle. */
+	ret = sys_munmap(ptr + page_size, page_size * 2);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* seal the first page. */
+	if (seal) {
+		ret = sys_mseal(ptr, page_size);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	/* munmap all 4 pages. */
+	ret = sys_munmap(ptr, size);
+	if (seal) {
+		FAIL_TEST_IF_FALSE(ret < 0);
+
+		size = get_vma_size(ptr, &prot);
+		FAIL_TEST_IF_FALSE(size == page_size);
+
+		size = get_vma_size(ptr + page_size * 3, &prot);
+		FAIL_TEST_IF_FALSE(size == page_size);
+	} else {
+		FAIL_TEST_IF_FALSE(!ret);
+
+		size = get_vma_size(ptr, &prot);
+		FAIL_TEST_IF_FALSE(size == 0);
+
+		size = get_vma_size(ptr + page_size * 3, &prot);
+		FAIL_TEST_IF_FALSE(size == 0);
+	}
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mremap_shrink(bool seal)
+{
+	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);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	/* shrink from 4 pages to 2 pages. */
+	ret2 = mremap(ptr, size, 2 * page_size, 0, 0);
+	if (seal) {
+		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
+		FAIL_TEST_IF_FALSE(errno == EPERM);
+	} else {
+		FAIL_TEST_IF_FALSE(ret2 != MAP_FAILED);
+
+	}
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mremap_expand(bool seal)
+{
+	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);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	if (seal) {
+		ret = sys_mseal(ptr, 2 * page_size);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	/* expand from 2 page to 4 pages. */
+	ret2 = mremap(ptr, 2 * page_size, 4 * page_size, 0, 0);
+	if (seal) {
+		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
+		FAIL_TEST_IF_FALSE(errno == EPERM);
+	} else {
+		FAIL_TEST_IF_FALSE(ret2 == ptr);
+
+	}
+
+	TEST_END_CHECK();
+}
+
+static void test_seal_mremap_move(bool seal)
+{
+	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);
+		FAIL_TEST_IF_FALSE(!ret);
+	}
+
+	/* move from ptr to fixed address.