[PATCH v2 3/4] selftests/mm: mseal_test add more tests for mmap

[jeffxu@chromium.org]

From: Jeff Xu <jeffxu@chromium.org>

Add sealing test to cover mmap for
Expand/shrink across vmas.
Reuse the same address in !MAP_FIXED case.

Signed-off-by: Jeff Xu <jeffxu@chromium.org>
---
 tools/testing/selftests/mm/mseal_test.c | 125 +++++++++++++++++++++++-
 1 file changed, 124 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
index ae06c354220d..d83538039e76 100644
--- a/tools/testing/selftests/mm/mseal_test.c
+++ b/tools/testing/selftests/mm/mseal_test.c
@@ -2222,6 +2222,122 @@ 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. */
+	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. */
+	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);
+
+	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 +2359,7 @@ 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 +2473,12 @@ 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