Thread (15 messages) 15 messages, 3 authors, 2024-10-21
STALE630d

[PATCH RFC v3 05/10] selftests: openat2: add 0xFF poisoned data after misaligned struct

From: Aleksa Sarai <hidden>
Date: 2024-10-09 20:41:53
Also in: linux-arch, linux-fsdevel, linux-kselftest, lkml
Subsystem: kernel selftest framework, the rest · Maintainers: Shuah Khan, Linus Torvalds

We should also verify that poisoned data after a misaligned struct is
also handled correctly by is_zeroed_user(). This test passes with no
kernel changes needed, so is_zeroed_user() was correct already.

Fixes: b28a10aedcd4 ("selftests: add openat2(2) selftests")
Signed-off-by: Aleksa Sarai <redacted>
---
 tools/testing/selftests/openat2/openat2_test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/openat2/openat2_test.c b/tools/testing/selftests/openat2/openat2_test.c
index 5790ab446527..4ca175a16ad6 100644
--- a/tools/testing/selftests/openat2/openat2_test.c
+++ b/tools/testing/selftests/openat2/openat2_test.c
@@ -112,9 +112,9 @@ void test_openat2_struct(void)
 				 *
 				 * This is effectively to check that is_zeroed_user() works.
 				 */
-				copy = malloc(misalign + sizeof(how_ext));
+				copy = malloc(misalign*2 + sizeof(how_ext));
 				how_copy = copy + misalign;
-				memset(copy, 0xff, misalign);
+				memset(copy, 0xff, misalign*2 + sizeof(how_ext));
 				memcpy(how_copy, &how_ext, sizeof(how_ext));
 			}
 
-- 
2.46.1
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