From: Andrey Ryabinin <aryabinin@virtuozzo.com> To: <akpm@linux-foundation.org> Cc: <glider@google.com>, <dvyukov@google.com>, <iamjoonsoo.kim@lge.com>, <kasan-dev@googlegroups.com>, <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>, Andrey Ryabinin <aryabinin@virtuozzo.com> Subject: [PATCH] mm-kasan-switch-slub-to-stackdepot-enable-memory-quarantine-for-slub-fix Date: Fri, 15 Jul 2016 19:50:23 +0300 [thread overview] Message-ID: <1468601423-28676-1-git-send-email-aryabinin@virtuozzo.com> (raw) - Remove CONFIG_SLAB ifdefs. The code works just fine with both allocators. - Reset metada offsets if metadata doesn't fit. Otherwise kasan_metadata_size() will give us the wrong results. Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> --- mm/kasan/kasan.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c index d92a7a2..b6f99e8 100644 --- a/mm/kasan/kasan.c +++ b/mm/kasan/kasan.c @@ -372,9 +372,7 @@ void kasan_cache_create(struct kmem_cache *cache, size_t *size, unsigned long *flags) { int redzone_adjust; -#ifdef CONFIG_SLAB int orig_size = *size; -#endif /* Add alloc meta. */ cache->kasan_info.alloc_meta_offset = *size; @@ -392,25 +390,20 @@ void kasan_cache_create(struct kmem_cache *cache, size_t *size, if (redzone_adjust > 0) *size += redzone_adjust; -#ifdef CONFIG_SLAB - *size = min(KMALLOC_MAX_SIZE, - max(*size, - cache->object_size + - optimal_redzone(cache->object_size))); + *size = min(KMALLOC_MAX_SIZE, max(*size, cache->object_size + + optimal_redzone(cache->object_size))); + /* * If the metadata doesn't fit, don't enable KASAN at all. */ if (*size <= cache->kasan_info.alloc_meta_offset || *size <= cache->kasan_info.free_meta_offset) { + cache->kasan_info.alloc_meta_offset = 0; + cache->kasan_info.free_meta_offset = 0; *size = orig_size; return; } -#else - *size = max(*size, - cache->object_size + - optimal_redzone(cache->object_size)); -#endif *flags |= SLAB_KASAN; } -- 2.7.3
WARNING: multiple messages have this Message-ID (diff)
From: Andrey Ryabinin <aryabinin@virtuozzo.com> To: akpm@linux-foundation.org Cc: glider@google.com, dvyukov@google.com, iamjoonsoo.kim@lge.com, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Ryabinin <aryabinin@virtuozzo.com> Subject: [PATCH] mm-kasan-switch-slub-to-stackdepot-enable-memory-quarantine-for-slub-fix Date: Fri, 15 Jul 2016 19:50:23 +0300 [thread overview] Message-ID: <1468601423-28676-1-git-send-email-aryabinin@virtuozzo.com> (raw) - Remove CONFIG_SLAB ifdefs. The code works just fine with both allocators. - Reset metada offsets if metadata doesn't fit. Otherwise kasan_metadata_size() will give us the wrong results. Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> --- mm/kasan/kasan.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c index d92a7a2..b6f99e8 100644 --- a/mm/kasan/kasan.c +++ b/mm/kasan/kasan.c @@ -372,9 +372,7 @@ void kasan_cache_create(struct kmem_cache *cache, size_t *size, unsigned long *flags) { int redzone_adjust; -#ifdef CONFIG_SLAB int orig_size = *size; -#endif /* Add alloc meta. */ cache->kasan_info.alloc_meta_offset = *size; @@ -392,25 +390,20 @@ void kasan_cache_create(struct kmem_cache *cache, size_t *size, if (redzone_adjust > 0) *size += redzone_adjust; -#ifdef CONFIG_SLAB - *size = min(KMALLOC_MAX_SIZE, - max(*size, - cache->object_size + - optimal_redzone(cache->object_size))); + *size = min(KMALLOC_MAX_SIZE, max(*size, cache->object_size + + optimal_redzone(cache->object_size))); + /* * If the metadata doesn't fit, don't enable KASAN at all. */ if (*size <= cache->kasan_info.alloc_meta_offset || *size <= cache->kasan_info.free_meta_offset) { + cache->kasan_info.alloc_meta_offset = 0; + cache->kasan_info.free_meta_offset = 0; *size = orig_size; return; } -#else - *size = max(*size, - cache->object_size + - optimal_redzone(cache->object_size)); -#endif *flags |= SLAB_KASAN; } -- 2.7.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next reply other threads:[~2016-07-16 0:23 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-07-15 16:50 Andrey Ryabinin [this message] 2016-07-15 16:50 ` [PATCH] mm-kasan-switch-slub-to-stackdepot-enable-memory-quarantine-for-slub-fix Andrey Ryabinin 2016-07-15 17:17 ` Alexander Potapenko 2016-07-15 17:17 ` Alexander Potapenko
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