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UPSTREAM: kasan: test: prevent cache merging in kmem_cache_double_destroy

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With HW_TAGS KASAN and kasan.stacktrace=off, the cache created in the
kmem_cache_double_destroy() test might get merged with an existing one.
Thus, the first kmem_cache_destroy() call won't actually destroy it but
will only decrease the refcount.  This causes the test to fail.

Provide an empty constructor for the created cache to prevent the cache
from getting merged.

Bug: 254441685
Link: https://lkml.kernel.org/r/b597bd434c49591d8af00ee3993a42c609dc9a59.1644346040.git.andreyknvl@google.com
Fixes: f98f966cd7 ("kasan: test: add test case for double-kmem_cache_destroy()")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 70effdc375)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Id8d36ff1431dd70f1fd0e5410619297836ccf3de
This commit is contained in:
Andrey Konovalov
2022-02-25 19:10:59 -08:00
committed by Treehugger Robot
parent d27c600b42
commit 3b68c1140f
1 changed files with 4 additions and 1 deletions
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5
lib/test_kasan.c
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@@ -879,11 +879,14 @@ static void kmem_cache_invalid_free(struct kunit *test)
kmem_cache_destroy(cache);
}
static void empty_cache_ctor(void *object) { }
static void kmem_cache_double_destroy(struct kunit *test)
{
struct kmem_cache *cache;
cache = kmem_cache_create("test_cache", 200, 0, 0, NULL);
/* Provide a constructor to prevent cache merging. */
cache = kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
kmem_cache_destroy(cache);
KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_destroy(cache));