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