linux-hardening - [PATCH v3 3/5] selftests/mseal: munmap across multiple vma ranges.

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Message-ID: <20240830180237.1220027-4-jeffxu@chromium.org>
Date: Fri, 30 Aug 2024 18:02:35 +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 3/5] selftests/mseal: munmap across multiple vma ranges.

From: Jeff Xu <jeffxu@...omium.org>

Add a test to munmap across multiple vma ranges.

Signed-off-by: Jeff Xu <jeffxu@...omium.org>
---
 tools/testing/selftests/mm/mseal_test.c | 80 ++++++++++++++++++++++++-
 1 file changed, 79 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
index 6d77dc9b5442..e855c8ccefc3 100644
--- a/tools/testing/selftests/mm/mseal_test.c
+++ b/tools/testing/selftests/mm/mseal_test.c
@@ -2147,6 +2147,81 @@ static void test_seal_discard_madvise_advice(void)
 	REPORT_TEST_PASS();
 }
 
+static void test_munmap_free_multiple_ranges(bool seal)
+{
+	void *ptr;
+	unsigned long page_size = getpagesize();
+	unsigned long size = 8 * page_size;
+	int ret;
+	int prot;
+
+	setup_single_address(size, &ptr);
+	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
+
+	/* unmap one page from beginning. */
+	ret = sys_munmap(ptr, page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	/* unmap one page from middle. */
+	ret = sys_munmap(ptr + 4 * page_size, page_size);
+	FAIL_TEST_IF_FALSE(!ret);
+
+	size = get_vma_size(ptr + page_size, &prot);
+	FAIL_TEST_IF_FALSE(size == 3 * page_size);
+	FAIL_TEST_IF_FALSE(prot == 4);
+
+	size = get_vma_size(ptr +  5 * page_size, &prot);
+	FAIL_TEST_IF_FALSE(size == 3 * page_size);
+	FAIL_TEST_IF_FALSE(prot == 4);
+
+
+	/* seal the last page */
+	if (seal) {
+		ret = sys_mseal(ptr + 7 * page_size, 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 == 4);
+
+		size = get_vma_size(ptr +  5 * page_size, &prot);
+		FAIL_TEST_IF_FALSE(size == 2 * page_size);
+		FAIL_TEST_IF_FALSE(prot == 4);
+
+		size = get_vma_size(ptr +  7 * page_size, &prot);
+		FAIL_TEST_IF_FALSE(size == 1 * page_size);
+		FAIL_TEST_IF_FALSE(prot == 4);
+	}
+
+	/* munmap all 8  pages from beginning */
+	ret = sys_munmap(ptr, 8 * page_size);
+	if (seal) {
+		FAIL_TEST_IF_FALSE(ret);
+
+		/* verify mapping are not changed */
+		size = get_vma_size(ptr + 1 * page_size, &prot);
+		FAIL_TEST_IF_FALSE(size == 3 * page_size);
+		FAIL_TEST_IF_FALSE(prot == 4);
+
+		size = get_vma_size(ptr +  5 * page_size, &prot);
+		FAIL_TEST_IF_FALSE(size == 2 * page_size);
+		FAIL_TEST_IF_FALSE(prot == 4);
+
+		size = get_vma_size(ptr +  7 * page_size, &prot);
+		FAIL_TEST_IF_FALSE(size == 1 * page_size);
+		FAIL_TEST_IF_FALSE(prot == 4);
+	} else {
+		FAIL_TEST_IF_FALSE(!ret);
+
+		for (int i = 0; i < 8; i++) {
+			size = get_vma_size(ptr, &prot);
+			FAIL_TEST_IF_FALSE(size == 0);
+		}
+	}
+
+	REPORT_TEST_PASS();
+}
+
 int main(int argc, char **argv)
 {
 	bool test_seal = seal_support();
@@ -2168,7 +2243,7 @@ int main(int argc, char **argv)
 	if (!get_vma_size_supported())
 		ksft_exit_skip("get_vma_size not supported\n");
 
-	ksft_set_plan(89);
+	ksft_set_plan(91);
 
 	test_seal_addseal();
 	test_seal_unmapped_start();
@@ -2279,5 +2354,8 @@ int main(int argc, char **argv)
 
 	test_seal_discard_madvise_advice();
 
+	test_munmap_free_multiple_ranges(false);
+	test_munmap_free_multiple_ranges(true);
+
 	ksft_finished();
 }
-- 
2.46.0.469.g59c65b2a67-goog