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mempool: skip slub_debug poisoning when KASAN is enabled 

With the changes in the following patch, KASAN starts saving its metadata
within freed mempool elements.

Thus, skip slub_debug poisoning and checking of mempool elements when
KASAN is enabled.  Corruptions of freed mempool elements will be detected
by KASAN anyway.

Link: https://lkml.kernel.org/r/98a4b1617e8ceeb266ef9a46f5e8c7f67a563ad2.1703024586.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>

Cc: Alexander Lobakin <alobakin@pm.me>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Breno Leitao <leitao@debian.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2023-12-19 23:28:57 +01:00 committed by Andrew Morton
parent 29d7355a9d
commit 7d4847ded2
1 changed files with 8 additions and 0 deletions
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8
mm/mempool.c
View File

@ -56,6 +56,10 @@ static void __check_element(mempool_t *pool, void *element, size_t size)
static void check_element(mempool_t *pool, void *element)
{
/* Skip checking: KASAN might save its metadata in the element. */
if (kasan_enabled())
return;
/* Mempools backed by slab allocator */
if (pool->free == mempool_kfree) {
__check_element(pool, element, (size_t)pool->pool_data);
@ -81,6 +85,10 @@ static void __poison_element(void *element, size_t size)
static void poison_element(mempool_t *pool, void *element)
{
/* Skip poisoning: KASAN might save its metadata in the element. */
if (kasan_enabled())
return;
/* Mempools backed by slab allocator */
if (pool->alloc == mempool_kmalloc) {
__poison_element(element, (size_t)pool->pool_data);