From: jeffxu@chromium.org
To: akpm@linux-foundation.org, keescook@chromium.org,
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Cc: jeffxu@google.com, jorgelo@chromium.org, groeck@chromium.org,
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Subject: [RFC PATCH v2 8/8] selftest mm/mseal mprotect/munmap/mremap/mmap
Date: Tue, 17 Oct 2023 09:08:15 +0000 [thread overview]
Message-ID: <20231017090815.1067790-9-jeffxu@chromium.org> (raw)
In-Reply-To: <20231017090815.1067790-1-jeffxu@chromium.org>
From: Jeff Xu <jeffxu@google.com>
selftest for sealing mprotect/munmap/mremap/mmap
Signed-off-by: Jeff Xu <jeffxu@google.com>
---
tools/testing/selftests/mm/Makefile | 1 +
tools/testing/selftests/mm/mseal_test.c | 1428 +++++++++++++++++++++++
2 files changed, 1429 insertions(+)
create mode 100644 tools/testing/selftests/mm/mseal_test.c
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/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
new file mode 100644
index 000000000000..d6ae09729394
--- /dev/null
+++ b/tools/testing/selftests/mm/mseal_test.c
@@ -0,0 +1,1428 @@
+// 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>
+
+#ifndef MM_SEAL_MSEAL
+#define MM_SEAL_MSEAL 0x1
+#endif
+
+#ifndef MM_SEAL_MPROTECT
+#define MM_SEAL_MPROTECT 0x2
+#endif
+
+#ifndef MM_SEAL_MUNMAP
+#define MM_SEAL_MUNMAP 0x4
+#endif
+
+#ifndef MM_SEAL_MMAP
+#define MM_SEAL_MMAP 0x8
+#endif
+
+#ifndef MM_SEAL_MREMAP
+#define MM_SEAL_MREMAP 0x10
+#endif
+
+#ifndef DEBUG
+#define LOG_TEST_ENTER() {}
+#else
+#define LOG_TEST_ENTER() { printf("%s\n", __func__); }
+#endif
+
+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_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;
+}
+
+void *addr1 = (void *)0x50000000;
+void *addr2 = (void *)0x50004000;
+void *addr3 = (void *)0x50008000;
+void setup_single_address(int size, void **ptrOut)
+{
+ void *ptr;
+
+ ptr = mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ assert(ptr != (void *)-1);
+ *ptrOut = ptr;
+}
+
+void setup_single_fixed_address(int size, void **ptrOut)
+{
+ void *ptr;
+
+ ptr = mmap(addr1, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ assert(ptr == (void *)addr1);
+
+ *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_MPROTECT);
+ 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_MPROTECT);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_MMAP);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_MREMAP);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_MSEAL);
+ assert(!ret);
+
+ clean_single_address(ptr, size);
+}
+
+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_MPROTECT);
+ assert(!ret);
+
+ /* adding multiple seals */
+ ret = sys_mseal(ptr, size,
+ MM_SEAL_MPROTECT | MM_SEAL_MMAP | MM_SEAL_MREMAP |
+ MM_SEAL_MSEAL);
+ assert(!ret);
+
+ /* not adding more seal type, so ok. */
+ ret = sys_mseal(ptr, size,
+ MM_SEAL_MMAP | MM_SEAL_MREMAP | MM_SEAL_MSEAL);
+ assert(!ret);
+
+ /* not adding more seal type, so ok. */
+ ret = sys_mseal(ptr, size, MM_SEAL_MSEAL);
+ assert(!ret);
+
+ clean_single_address(ptr, size);
+}
+
+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_MPROTECT | MM_SEAL_MSEAL);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_MPROTECT);
+ assert(!ret);
+
+ /* MM_SEAL_MSEAL is set, so not allow new seal type . */
+ ret = sys_mseal(ptr, size,
+ MM_SEAL_MPROTECT | MM_SEAL_MMAP | MM_SEAL_MSEAL);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_MMAP);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_MMAP | MM_SEAL_MSEAL);
+ assert(ret < 0);
+
+ clean_single_address(ptr, size);
+}
+
+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_MSEAL);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr + 2 * page_size, 2 * page_size, MM_SEAL_MSEAL);
+ assert(!ret);
+
+ clean_single_address(ptr, size);
+}
+
+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_MSEAL);
+ assert(ret < 0);
+
+ /* we still can add seal to the first page and last page*/
+ ret = sys_mseal(ptr, page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(!ret);
+
+ ret = sys_mseal(ptr + 3 * page_size, page_size,
+ MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(!ret);
+
+ clean_single_address(ptr, size);
+}
+
+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_MSEAL);
+ assert(ret < 0);
+
+ /* The first 2 pages is not sealed, and can add seals */
+ ret = sys_mseal(ptr, 2 * page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(!ret);
+
+ clean_single_address(ptr, size);
+}
+
+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_MSEAL);
+ assert(!ret);
+
+ // verify additional seal type will fail after MM_SEAL_MSEAL set.
+ ret = sys_mseal(ptr, page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr + page_size, 2 * page_size,
+ MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(ret < 0);
+
+ ret = sys_mseal(ptr + 3 * page_size, page_size,
+ MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(ret < 0);
+
+ clean_single_address(ptr, size);
+}
+
+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_MSEAL);
+ assert(!ret);
+
+ /* can't add seal to the first page */
+ ret = sys_mseal(ptr, page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(ret < 0);
+
+ /* add seal to the remain 3 pages */
+ ret = sys_mseal(ptr + page_size, 3 * page_size,
+ MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(!ret);
+
+ clean_single_address(ptr, size);
+}
+
+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_fixed_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_MSEAL);
+ assert(!ret);
+
+ /* adding seal to the last page is rejected. */
+ ret = sys_mseal(ptr + 3 * page_size, page_size,
+ MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(ret < 0);
+
+ /* Adding seals to the first 3 pages */
+ ret = sys_mseal(ptr, 3 * page_size, MM_SEAL_MSEAL | MM_SEAL_MPROTECT);
+ assert(!ret);
+
+ clean_single_address(ptr, size);
+}
+
+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_fixed_address(size, &ptr);
+
+ /* 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_MSEAL);
+ assert(ret < 0);
+
+ /* length too big */
+ ret = sys_mseal(ptr, 5 * page_size, MM_SEAL_MSEAL);
+ assert(ret < 0);
+
+ /* start is not in a valid VMA */
+ ret = sys_mseal(ptr - page_size, 5 * page_size, MM_SEAL_MSEAL);
+ assert(ret < 0);
+
+ clean_single_address(ptr, size);
+}
+
+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_MPROTECT);
+ assert(!ret);
+
+ // verify the 4 pages are not sealed by previous call.
+ ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
+ assert(!ret);
+
+ clean_single_address(ptr, size);
+}
+
+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_MPROTECT);
+ assert(!ret);
+
+ // apply the same seal will be OK. idempotent.
+ ret = sys_mseal(ptr, size, MM_SEAL_MPROTECT);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size,
+ MM_SEAL_MPROTECT | MM_SEAL_MMAP | MM_SEAL_MREMAP |
+ MM_SEAL_MSEAL);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size,
+ MM_SEAL_MPROTECT | MM_SEAL_MMAP | MM_SEAL_MREMAP |
+ MM_SEAL_MSEAL);
+ assert(!ret);
+
+ ret = sys_mseal(ptr, size, MM_SEAL_MSEAL);
+ assert(!ret);
+
+ clean_single_address(ptr, size);
+}
+
+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);
+
+ clean_single_address(ptr, size);
+}
+
+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);
+
+ clean_single_address(ptr, size);
+}
+
+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);
+
+ clean_single_address(ptr, size);
+}
+
+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);
+
+ clean_single_address(ptr, size);
+}
+
+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);
+
+ clean_single_address(ptr, size);
+}
+
+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);
+
+ clean_single_address(ptr, size);
+}
+
+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);
+
+ clean_single_address(ptr, size);
+}
+
+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);
+
+ clean_single_address(ptr, size);
+}
+
+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_MPROTECT);
+ 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);
+
+ clean_single_address(ptr, size);
+}
+
+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_MPROTECT);
+ 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);
+
+ clean_single_address(ptr, size);
+}
+
+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_MPROTECT);
+ 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);
+
+ clean_single_address(ptr, size);
+}
+
+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_MUNMAP);
+ 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_MUNMAP);
+ 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_MUNMAP);
+ 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_MUNMAP);
+ 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_MUNMAP);
+ 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_MUNMAP);
+ 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_MREMAP);
+ 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);
+ clean_single_address(ret2, 2 * page_size);
+ }
+ clean_single_address(ptr, size);
+}
+
+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_MREMAP);
+ 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);
+ clean_single_address(ret2, 4 * page_size);
+ }
+ clean_single_address(ptr, size);
+}
+
+void test_seal_mremap_move(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_MREMAP);
+ assert(!ret);
+ }
+
+ // move from ptr to fixed address.
+ ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, addr1);
+ if (seal) {
+ assert(ret2 == MAP_FAILED);
+ assert(errno == EACCES);
+ } else {
+ assert(ret2 != MAP_FAILED);
+ clean_single_address(ret2, size);
+ }
+ clean_single_address(ptr, size);
+}
+
+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_MMAP);
+ 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);
+
+ clean_single_address(ptr, size);
+}
+
+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_fixed_address(size, &newAddr);
+
+ if (seal) {
+ ret = sys_mseal(ptr, size, MM_SEAL_MREMAP);
+ 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);
+
+ clean_single_address(ptr, size);
+ clean_single_address(newAddr, size);
+}
+
+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_fixed_address(size, &newAddr);
+
+ if (seal) {
+ ret = sys_mseal(newAddr, size, MM_SEAL_MREMAP);
+ 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);
+
+ clean_single_address(ptr, page_size);
+ clean_single_address(newAddr, size);
+}
+
+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_fixed_address(size, &newAddr);
+
+ if (seal) {
+ ret = sys_mseal(newAddr, size, MM_SEAL_MREMAP);
+ 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);
+
+ clean_single_address(ptr, page_size);
+ clean_single_address(newAddr, size);
+}
+
+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_MREMAP);
+ 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);
+ clean_single_address(ret2, 2 * page_size);
+ }
+ clean_single_address(ptr, size);
+}
+
+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_MREMAP);
+ 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);
+ clean_single_address(ret2, size);
+ }
+
+ clean_single_address(ptr, page_size);
+}
+
+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_MREMAP);
+ 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);
+ clean_single_address(ret2, size);
+ }
+
+ clean_single_address(ptr, page_size);
+}
+
+int main(int argc, char **argv)
+{
+ 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_mmap_overwrite_prot(false);
+ test_seal_mmap_overwrite_prot(true);
+
+ printf("OK\n");
+ return 0;
+}
--
2.42.0.655.g421f12c284-goog
next prev parent reply other threads:[~2023-10-17 9:09 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-17 9:08 [RFC PATCH v2 0/8] Introduce mseal() syscall jeffxu
2023-10-17 9:08 ` [RFC PATCH v2 1/8] mseal: Add mseal(2) syscall jeffxu
2023-10-17 15:45 ` Randy Dunlap
2023-10-17 9:08 ` [RFC PATCH v2 2/8] mseal: Wire up mseal syscall jeffxu
2023-10-17 9:08 ` [RFC PATCH v2 3/8] mseal: add can_modify_mm and can_modify_vma jeffxu
2023-10-17 9:08 ` [RFC PATCH v2 4/8] mseal: Check seal flag for mprotect(2) jeffxu
2023-10-17 9:08 ` [RFC PATCH v2 5/8] mseal: Check seal flag for munmap(2) jeffxu
2023-10-17 16:54 ` Linus Torvalds
2023-10-18 15:08 ` Jeff Xu
2023-10-18 17:14 ` Jeff Xu
2023-10-18 18:27 ` Linus Torvalds
2023-10-18 19:07 ` Jeff Xu
2023-10-17 9:08 ` [RFC PATCH v2 6/8] mseal: Check seal flag for mremap(2) jeffxu
2023-10-20 13:56 ` Muhammad Usama Anjum
2023-10-17 9:08 ` [RFC PATCH v2 7/8] mseal:Check seal flag for mmap(2) jeffxu
2023-10-17 17:04 ` Linus Torvalds
2023-10-17 17:43 ` Linus Torvalds
2023-10-18 7:01 ` Jeff Xu
2023-10-19 7:27 ` Stephen Röttger
2023-10-17 9:08 ` jeffxu [this message]
2023-10-20 14:24 ` [RFC PATCH v2 8/8] selftest mm/mseal mprotect/munmap/mremap/mmap Muhammad Usama Anjum
2023-10-20 15:23 ` Peter Zijlstra
2023-10-20 16:33 ` Muhammad Usama Anjum
2023-10-19 9:19 ` [RFC PATCH v2 0/8] Introduce mseal() syscall David Laight
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