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linux/tools/testing/selftests/mm/mseal_test.c 

// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <linux/mman.h>
#include <sys/mman.h>
#include <stdint.h>
#include <asm-generic/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 <fcntl.h>
#include <sys/ioctl.h>
#include <sys/vfs.h>
#include <sys/stat.h>
#include "mseal_helpers.h"

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 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 void *sys_mremap(void *addr, size_t old_len, size_t new_len,
	unsigned long flags, void *new_addr)
{
	void *sret;

	errno = 0;
	sret = (void *) syscall(__NR_mremap, addr, old_len, new_len, flags, new_addr);
	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));
#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)
{
	u64 new_pkey_reg;

	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 = mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
	*ptrOut = ptr;
}

static void setup_single_address_rw(int size, void **ptrOut)
{
	void *ptr;
	unsigned long mapflags = MAP_ANONYMOUS | MAP_PRIVATE;

	ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, mapflags, -1, 0);
	*ptrOut = ptr;
}

static int clean_single_address(void *ptr, int size)
{
	int ret;
	ret = munmap(ptr, size);
	return ret;
}

static int seal_single_address(void *ptr, int size)
{
	int ret;
	ret = sys_mseal(ptr, size);
	return ret;
}

bool seal_support(void)
{
	int ret;
	void *ptr;
	unsigned long page_size = getpagesize();

	ptr = 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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	ret = sys_mseal(ptr, size);
	FAIL_TEST_IF_FALSE(!ret);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
	ret = clean_single_address(ptr + 4 * page_size, 4 * page_size);
	FAIL_TEST_IF_FALSE(!ret);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	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);

	REPORT_TEST_PASS();
}

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 = 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = seal_single_address(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = seal_single_address(ptr, page_size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = seal_single_address(ptr + page_size, 3 * page_size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = seal_single_address(ptr, page_size * 2 - 1);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
	if (seal) {
		ret =  seal_single_address(ptr, page_size * 2 + 1);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* use mprotect to split */
	ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
	FAIL_TEST_IF_FALSE(!ret);

	if (seal) {
		ret = seal_single_address(ptr, page_size * 4);
		FAIL_TEST_IF_FALSE(!ret);
	}

	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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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) {
		ret = seal_single_address(ptr + page_size, page_size * 2);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* seal one page. */
	if (seal) {
		ret = seal_single_address(ptr, page_size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* 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);

	REPORT_TEST_PASS();
}

static void test_seal_mprotect_partial_mprotect_tail(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 2 * page_size;
	int ret;
	int prot;

	/*
	 * Check if a partial mseal (that results in two vmas) works correctly.
	 * It might mprotect the first, but it'll never touch the second (msealed) vma.
	 */

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr + page_size, page_size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	ret = sys_mprotect(ptr, size, PROT_EXEC);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	if (seal) {
		FAIL_TEST_IF_FALSE(get_vma_size(ptr + page_size, &prot) > 0);
		FAIL_TEST_IF_FALSE(prot == 0x4);
	}

	REPORT_TEST_PASS();
}


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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	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);

	REPORT_TEST_PASS();
}

/*
 * 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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

/*
 * 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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	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);

	REPORT_TEST_PASS();
}

static void test_seal_munmap_partial_across_vmas(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 2 * page_size;
	int ret;
	int prot;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr + page_size, page_size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	ret = sys_munmap(ptr, size);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	if (seal) {
		FAIL_TEST_IF_FALSE(get_vma_size(ptr + page_size, &prot) > 0);
		FAIL_TEST_IF_FALSE(prot == 0x4);
	}

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);
	}

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* 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);
	}

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* shrink from 4 pages to 2 pages. */
	ret2 = sys_mremap(ptr, size, 2 * page_size, 0, 0);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == (void *) MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else {
		FAIL_TEST_IF_FALSE(ret2 != (void *) MAP_FAILED);

	}

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
	/* 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 = sys_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);

	}

	REPORT_TEST_PASS();
}

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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
	setup_single_address(size, &newPtr);
	FAIL_TEST_IF_FALSE(newPtr != (void *)-1);
	ret = clean_single_address(newPtr, size);
	FAIL_TEST_IF_FALSE(!ret);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* move from ptr to fixed address. */
	ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newPtr);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else {
		FAIL_TEST_IF_FALSE(ret2 != MAP_FAILED);

	}

	REPORT_TEST_PASS();
}

static void test_seal_mmap_overwrite_prot(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = page_size;
	int ret;
	void *ret2;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* use mmap to change protection. */
	ret2 = mmap(ptr, size, PROT_NONE,
		    MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else
		FAIL_TEST_IF_FALSE(ret2 == ptr);

	REPORT_TEST_PASS();
}

static void test_seal_mmap_expand(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 12 * page_size;
	int ret;
	void *ret2;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
	/* ummap last 4 pages. */
	ret = sys_munmap(ptr + 8 * page_size, 4 * page_size);
	FAIL_TEST_IF_FALSE(!ret);

	if (seal) {
		ret = sys_mseal(ptr, 8 * page_size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* use mmap to expand. */
	ret2 = mmap(ptr, size, PROT_READ,
		    MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else
		FAIL_TEST_IF_FALSE(ret2 == ptr);

	REPORT_TEST_PASS();
}

static void test_seal_mmap_shrink(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 12 * page_size;
	int ret;
	void *ret2;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* use mmap to shrink. */
	ret2 = mmap(ptr, 8 * page_size, PROT_READ,
		    MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else
		FAIL_TEST_IF_FALSE(ret2 == ptr);

	REPORT_TEST_PASS();
}

static void test_seal_mremap_shrink_fixed(bool seal)
{
	void *ptr;
	void *newAddr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;
	void *ret2;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
	setup_single_address(size, &newAddr);
	FAIL_TEST_IF_FALSE(newAddr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* mremap to move and shrink to fixed address */
	ret2 = sys_mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
			newAddr);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else
		FAIL_TEST_IF_FALSE(ret2 == newAddr);

	REPORT_TEST_PASS();
}

static void test_seal_mremap_expand_fixed(bool seal)
{
	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);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
	setup_single_address(size, &newAddr);
	FAIL_TEST_IF_FALSE(newAddr != (void *)-1);

	if (seal) {
		ret = sys_mseal(newAddr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* mremap to move and expand to fixed address */
	ret2 = sys_mremap(ptr, page_size, size, MREMAP_MAYMOVE | MREMAP_FIXED,
			newAddr);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else
		FAIL_TEST_IF_FALSE(ret2 == newAddr);

	REPORT_TEST_PASS();
}

static void test_seal_mremap_move_fixed(bool seal)
{
	void *ptr;
	void *newAddr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;
	void *ret2;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
	setup_single_address(size, &newAddr);
	FAIL_TEST_IF_FALSE(newAddr != (void *)-1);

	if (seal) {
		ret = sys_mseal(newAddr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* mremap to move to fixed address */
	ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newAddr);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else
		FAIL_TEST_IF_FALSE(ret2 == newAddr);

	REPORT_TEST_PASS();
}

static void test_seal_mremap_move_fixed_zero(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;
	void *ret2;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/*
	 * MREMAP_FIXED can move the mapping to zero address
	 */
	ret2 = sys_mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
			0);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else {
		FAIL_TEST_IF_FALSE(ret2 == 0);
	}

	REPORT_TEST_PASS();
}

static void test_seal_mremap_move_dontunmap(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;
	void *ret2;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* mremap to move, and don't unmap src addr. */
	ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, 0);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else {
		/* kernel will allocate a new address */
		FAIL_TEST_IF_FALSE(ret2 != MAP_FAILED);
	}

	REPORT_TEST_PASS();
}

static void test_seal_mremap_move_dontunmap_anyaddr(bool seal)
{
	void *ptr, *ptr2;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;
	void *ret2;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/*
	 * The new address is any address that not allocated.
	 * use allocate/free to similate that.
	 */
	setup_single_address(size, &ptr2);
	FAIL_TEST_IF_FALSE(ptr2 != (void *)-1);
	ret = sys_munmap(ptr2, size);
	FAIL_TEST_IF_FALSE(!ret);

	/*
	 * remap to any address.
	 */
	ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP,
			(void *) ptr2);
	if (seal) {
		FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED);
		FAIL_TEST_IF_FALSE(errno == EPERM);
	} else {
		/* remap success and return ptr2 */
		FAIL_TEST_IF_FALSE(ret2 ==  ptr2);
	}

	REPORT_TEST_PASS();
}

static void test_seal_merge_and_split(void)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size;
	int ret;
	int prot;

	/* (24 RO) */
	setup_single_address(24 * page_size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	/* use mprotect(NONE) to set out boundary */
	/* (1 NONE) (22 RO) (1 NONE) */
	ret = sys_mprotect(ptr, page_size, PROT_NONE);
	FAIL_TEST_IF_FALSE(!ret);
	ret = sys_mprotect(ptr + 23 * page_size, page_size, PROT_NONE);
	FAIL_TEST_IF_FALSE(!ret);
	size = get_vma_size(ptr + page_size, &prot);
	FAIL_TEST_IF_FALSE(size == 22 * page_size);
	FAIL_TEST_IF_FALSE(prot == 4);

	/* use mseal to split from beginning */
	/* (1 NONE) (1 RO_SEAL) (21 RO) (1 NONE) */
	ret = sys_mseal(ptr + page_size, page_size);
	FAIL_TEST_IF_FALSE(!ret);
	size = get_vma_size(ptr + page_size, &prot);
	FAIL_TEST_IF_FALSE(size == page_size);
	FAIL_TEST_IF_FALSE(prot == 0x4);
	size = get_vma_size(ptr + 2 * page_size, &prot);
	FAIL_TEST_IF_FALSE(size == 21 * page_size);
	FAIL_TEST_IF_FALSE(prot == 0x4);

	/* use mseal to split from the end. */
	/* (1 NONE) (1 RO_SEAL) (20 RO) (1 RO_SEAL) (1 NONE) */
	ret = sys_mseal(ptr + 22 * page_size, page_size);
	FAIL_TEST_IF_FALSE(!ret);
	size = get_vma_size(ptr + 22 * page_size, &prot);
	FAIL_TEST_IF_FALSE(size == page_size);
	FAIL_TEST_IF_FALSE(prot == 0x4);
	size = get_vma_size(ptr + 2 * page_size, &prot);
	FAIL_TEST_IF_FALSE(size == 20 * page_size);
	FAIL_TEST_IF_FALSE(prot == 0x4);

	/* merge with prev. */
	/* (1 NONE) (2 RO_SEAL) (19 RO) (1 RO_SEAL) (1 NONE) */
	ret = sys_mseal(ptr + 2 * page_size, page_size);
	FAIL_TEST_IF_FALSE(!ret);
	size = get_vma_size(ptr +  page_size, &prot);
	FAIL_TEST_IF_FALSE(size ==  2 * page_size);
	FAIL_TEST_IF_FALSE(prot == 0x4);

	/* merge with after. */
	/* (1 NONE) (2 RO_SEAL) (18 RO) (2 RO_SEALS) (1 NONE) */
	ret = sys_mseal(ptr + 21 * page_size, page_size);
	FAIL_TEST_IF_FALSE(!ret);
	size = get_vma_size(ptr +  21 * page_size, &prot);
	FAIL_TEST_IF_FALSE(size ==  2 * page_size);
	FAIL_TEST_IF_FALSE(prot == 0x4);

	/* split and merge from prev */
	/* (1 NONE) (3 RO_SEAL) (17 RO) (2 RO_SEALS) (1 NONE) */
	ret = sys_mseal(ptr + 2 * page_size, 2 * page_size);
	FAIL_TEST_IF_FALSE(!ret);
	size = get_vma_size(ptr +  1 * page_size, &prot);
	FAIL_TEST_IF_FALSE(size ==  3 * page_size);
	FAIL_TEST_IF_FALSE(prot == 0x4);
	ret = sys_munmap(ptr + page_size,  page_size);
	FAIL_TEST_IF_FALSE(ret < 0);
	ret = sys_mprotect(ptr + 2 * page_size, page_size,  PROT_NONE);
	FAIL_TEST_IF_FALSE(ret < 0);

	/* split and merge from next */
	/* (1 NONE) (3 RO_SEAL) (16 RO) (3 RO_SEALS) (1 NONE) */
	ret = sys_mseal(ptr + 20 * page_size, 2 * page_size);
	FAIL_TEST_IF_FALSE(!ret);
	FAIL_TEST_IF_FALSE(prot == 0x4);
	size = get_vma_size(ptr +  20 * page_size, &prot);
	FAIL_TEST_IF_FALSE(size ==  3 * page_size);
	FAIL_TEST_IF_FALSE(prot == 0x4);

	/* merge from middle of prev and middle of next. */
	/* (1 NONE) (22 RO_SEAL) (1 NONE) */
	ret = sys_mseal(ptr + 2 * page_size, 20 * page_size);
	FAIL_TEST_IF_FALSE(!ret);
	size = get_vma_size(ptr +  page_size, &prot);
	FAIL_TEST_IF_FALSE(size ==  22 * page_size);
	FAIL_TEST_IF_FALSE(prot == 0x4);

	REPORT_TEST_PASS();
}

static void test_seal_discard_ro_anon_on_rw(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;

	setup_single_address_rw(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* sealing doesn't take effect on RW memory. */
	ret = sys_madvise(ptr, size, MADV_DONTNEED);
	FAIL_TEST_IF_FALSE(!ret);

	/* base seal still apply. */
	ret = sys_munmap(ptr, size);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	REPORT_TEST_PASS();
}

static void test_seal_discard_ro_anon_on_pkey(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;
	int pkey;

	SKIP_TEST_IF_FALSE(pkey_supported());

	setup_single_address_rw(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	pkey = sys_pkey_alloc(0, 0);
	FAIL_TEST_IF_FALSE(pkey > 0);

	ret = sys_mprotect_pkey((void *)ptr, size, PROT_READ | PROT_WRITE, pkey);
	FAIL_TEST_IF_FALSE(!ret);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* sealing doesn't take effect if PKRU allow write. */
	set_pkey(pkey, 0);
	ret = sys_madvise(ptr, size, MADV_DONTNEED);
	FAIL_TEST_IF_FALSE(!ret);

	/* sealing will take effect if PKRU deny write. */
	set_pkey(pkey, PKEY_DISABLE_WRITE);
	ret = sys_madvise(ptr, size, MADV_DONTNEED);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	/* base seal still apply. */
	ret = sys_munmap(ptr, size);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	REPORT_TEST_PASS();
}

static void test_seal_discard_ro_anon_on_filebacked(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;
	int fd;
	unsigned long mapflags = MAP_PRIVATE;

	fd = memfd_create("test", 0);
	FAIL_TEST_IF_FALSE(fd > 0);

	ret = fallocate(fd, 0, 0, size);
	FAIL_TEST_IF_FALSE(!ret);

	ptr = mmap(NULL, size, PROT_READ, mapflags, fd, 0);
	FAIL_TEST_IF_FALSE(ptr != MAP_FAILED);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* sealing doesn't apply for file backed mapping. */
	ret = sys_madvise(ptr, size, MADV_DONTNEED);
	FAIL_TEST_IF_FALSE(!ret);

	ret = sys_munmap(ptr, size);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);
	close(fd);

	REPORT_TEST_PASS();
}

static void test_seal_discard_ro_anon_on_shared(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;
	unsigned long mapflags = MAP_ANONYMOUS | MAP_SHARED;

	ptr = mmap(NULL, size, PROT_READ, mapflags, -1, 0);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = sys_mseal(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/* sealing doesn't apply for shared mapping. */
	ret = sys_madvise(ptr, size, MADV_DONTNEED);
	FAIL_TEST_IF_FALSE(!ret);

	ret = sys_munmap(ptr, size);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	REPORT_TEST_PASS();
}

static void test_seal_discard_ro_anon(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = seal_single_address(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	ret = sys_madvise(ptr, size, MADV_DONTNEED);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	ret = sys_munmap(ptr, size);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	REPORT_TEST_PASS();
}

static void test_seal_discard_across_vmas(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 2 * page_size;
	int ret;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = seal_single_address(ptr + page_size, page_size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	ret = sys_madvise(ptr, size, MADV_DONTNEED);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	ret = sys_munmap(ptr, size);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	REPORT_TEST_PASS();
}


static void test_seal_madvise_nodiscard(bool seal)
{
	void *ptr;
	unsigned long page_size = getpagesize();
	unsigned long size = 4 * page_size;
	int ret;

	setup_single_address(size, &ptr);
	FAIL_TEST_IF_FALSE(ptr != (void *)-1);

	if (seal) {
		ret = seal_single_address(ptr, size);
		FAIL_TEST_IF_FALSE(!ret);
	}

	/*
	 * Test a random madvise flag like MADV_RANDOM that does not touch page
	 * contents (and thus should work for msealed VMAs). RANDOM also happens to
	 * share bits with other discard-ish flags like REMOVE.
	 */
	ret = sys_madvise(ptr, size, MADV_RANDOM);
	FAIL_TEST_IF_FALSE(!ret);

	ret = sys_munmap(ptr, size);
	if (seal)
		FAIL_TEST_IF_FALSE(ret < 0);
	else
		FAIL_TEST_IF_FALSE(!ret);

	REPORT_TEST_PASS();
}

int main(int argc, char **argv)
{
	bool test_seal = seal_support();

	ksft_print_header();

	if (!test_seal)
		ksft_exit_skip("sealing not supported, check CONFIG_64BIT\n");

	if (!pkey_supported())
		ksft_print_msg("PKEY not supported\n");

	ksft_set_plan(88);

	test_seal_addseal();
	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_invalid_input();
	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_mprotect_partial_mprotect_tail(false);
	test_seal_mprotect_partial_mprotect_tail(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_seal_munmap_partial_across_vmas(false);
	test_seal_munmap_partial_across_vmas(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_madvise_nodiscard(false);
	test_seal_madvise_nodiscard(true);
	test_seal_discard_ro_anon(false);
	test_seal_discard_ro_anon(true);
	test_seal_discard_across_vmas(false);
	test_seal_discard_across_vmas(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_merge_and_split();
	test_seal_zero_address();

	test_seal_discard_ro_anon_on_pkey(false);
	test_seal_discard_ro_anon_on_pkey(true);

	ksft_finished();
}