[PATCH] mm-kasan-switch-slub-to-stackdepot-enable-memory-quarantine-for-slub-fix

[Andrey Ryabinin]

- 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 <aryabi...@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