[PATCH 4/8] kasan: test: disable kmalloc_memmove_invalid_size for HW_TAGS

[andrey . konovalov]

From: Andrey Konovalov <andreyknvl@xxxxxxxxx>

The HW_TAGS mode doesn't check memmove for negative size. As a result,
the kmalloc_memmove_invalid_size test corrupts memory, which can result
in a crash.

Disable this test with HW_TAGS KASAN.

Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxx>
---
 lib/test_kasan.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index fd00cd35e82c..0b5698cd7d1d 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -495,11 +495,17 @@ static void kmalloc_memmove_invalid_size(struct kunit *test)
 	size_t size = 64;
 	volatile size_t invalid_size = -2;
 
+	/*
+	 * Hardware tag-based mode doesn't check memmove for negative size.
+	 * As a result, this test introduces a side-effect memory corruption,
+	 * which can result in a crash.
+	 */
+	KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_HW_TAGS);
+
 	ptr = kmalloc(size, GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
 	memset((char *)ptr, 0, 64);
-
 	KUNIT_EXPECT_KASAN_FAIL(test,
 		memmove((char *)ptr, (char *)ptr + 4, invalid_size));
 	kfree(ptr);
-- 
2.25.1