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Message-ID: <20240830180237.1220027-5-jeffxu@chromium.org>
Date: Fri, 30 Aug 2024 18:02:36 +0000
From: jeffxu@...omium.org
To: akpm@...ux-foundation.org
Cc: linux-kselftest@...r.kernel.org,
linux-mm@...ck.org,
linux-hardening@...r.kernel.org,
linux-kernel@...r.kernel.org,
pedro.falcato@...il.com,
willy@...radead.org,
lorenzo.stoakes@...cle.com,
broonie@...nel.org,
vbabka@...e.cz,
Liam.Howlett@...cle.com,
rientjes@...gle.com,
keescook@...omium.org,
Jeff Xu <jeffxu@...omium.org>
Subject: [PATCH v3 4/5] selftests/mseal: add more tests for mmap
From: Jeff Xu <jeffxu@...omium.org>
Add sealing test to cover mmap for
Expand/shrink across sealed vmas (MAP_FIXED)
Reuse the same address in !MAP_FIXED case.
Signed-off-by: Jeff Xu <jeffxu@...omium.org>
---
tools/testing/selftests/mm/mseal_test.c | 126 +++++++++++++++++++++++-
1 file changed, 125 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
index e855c8ccefc3..3516389034a7 100644
--- a/tools/testing/selftests/mm/mseal_test.c
+++ b/tools/testing/selftests/mm/mseal_test.c
@@ -2222,6 +2222,123 @@ static void test_munmap_free_multiple_ranges(bool seal)
REPORT_TEST_PASS();
}
+static void test_seal_mmap_expand_seal_middle(bool seal)
+{
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 12 * page_size;
+ int ret;
+ void *ret2;
+ int prot;
+
+ 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);
+
+ size = get_vma_size(ptr, &prot);
+ FAIL_TEST_IF_FALSE(size == 8 * page_size);
+ FAIL_TEST_IF_FALSE(prot == 0x4);
+
+ if (seal) {
+ ret = sys_mseal(ptr + 4 * page_size, 4 * page_size);
+ FAIL_TEST_IF_FALSE(!ret);
+ }
+
+ /* use mmap to expand and overwrite (MAP_FIXED) */
+ ret2 = mmap(ptr, 12 * 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);
+
+ size = get_vma_size(ptr, &prot);
+ FAIL_TEST_IF_FALSE(size == 4 * page_size);
+ FAIL_TEST_IF_FALSE(prot == 0x4);
+
+ size = get_vma_size(ptr + 4 * page_size, &prot);
+ FAIL_TEST_IF_FALSE(size == 4 * page_size);
+ FAIL_TEST_IF_FALSE(prot == 0x4);
+ } else
+ FAIL_TEST_IF_FALSE(ret2 == ptr);
+
+ REPORT_TEST_PASS();
+}
+
+static void test_seal_mmap_shrink_seal_middle(bool seal)
+{
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 12 * page_size;
+ int ret;
+ void *ret2;
+ int prot;
+
+ setup_single_address(size, &ptr);
+ FAIL_TEST_IF_FALSE(ptr != (void *)-1);
+
+ if (seal) {
+ ret = sys_mseal(ptr + 4 * page_size, 4 * page_size);
+ FAIL_TEST_IF_FALSE(!ret);
+ }
+
+ /* use mmap to shrink and overwrite (MAP_FIXED) */
+ ret2 = mmap(ptr, 7 * 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);
+
+ size = get_vma_size(ptr, &prot);
+ FAIL_TEST_IF_FALSE(size == 4 * page_size);
+ FAIL_TEST_IF_FALSE(prot == 0x4);
+
+ size = get_vma_size(ptr + 4 * page_size, &prot);
+ FAIL_TEST_IF_FALSE(size == 4 * page_size);
+ FAIL_TEST_IF_FALSE(prot == 0x4);
+
+ size = get_vma_size(ptr + 4 * page_size, &prot);
+ FAIL_TEST_IF_FALSE(size == 4 * page_size);
+ FAIL_TEST_IF_FALSE(prot == 0x4);
+ } else
+ FAIL_TEST_IF_FALSE(ret2 == ptr);
+
+ REPORT_TEST_PASS();
+}
+
+static void test_seal_mmap_reuse_addr(bool seal)
+{
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = page_size;
+ int ret;
+ void *ret2;
+ int prot;
+
+ 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, -1, 0);
+
+ /* MAP_FIXED is not used, expect new addr */
+ FAIL_TEST_IF_FALSE(!(ret2 == MAP_FAILED));
+ FAIL_TEST_IF_FALSE(ret2 != ptr);
+
+ size = get_vma_size(ptr, &prot);
+ FAIL_TEST_IF_FALSE(size == page_size);
+ FAIL_TEST_IF_FALSE(prot == 0x4);
+
+ REPORT_TEST_PASS();
+}
+
int main(int argc, char **argv)
{
bool test_seal = seal_support();
@@ -2243,7 +2360,7 @@ int main(int argc, char **argv)
if (!get_vma_size_supported())
ksft_exit_skip("get_vma_size not supported\n");
- ksft_set_plan(91);
+ ksft_set_plan(97);
test_seal_addseal();
test_seal_unmapped_start();
@@ -2357,5 +2474,12 @@ int main(int argc, char **argv)
test_munmap_free_multiple_ranges(false);
test_munmap_free_multiple_ranges(true);
+ test_seal_mmap_expand_seal_middle(false);
+ test_seal_mmap_expand_seal_middle(true);
+ test_seal_mmap_shrink_seal_middle(false);
+ test_seal_mmap_shrink_seal_middle(true);
+ test_seal_mmap_reuse_addr(false);
+ test_seal_mmap_reuse_addr(true);
+
ksft_finished();
}
--
2.46.0.469.g59c65b2a67-goog
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