diff options
| -rw-r--r-- | net/core/skbuff.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index bdb1e015e32b..70a6088e8326 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4690,10 +4690,16 @@ void __init skb_init(void) SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); #ifdef HAVE_SKB_SMALL_HEAD_CACHE - skb_small_head_cache = kmem_cache_create("skbuff_small_head", + /* usercopy should only access first SKB_SMALL_HEAD_HEADROOM bytes. + * struct skb_shared_info is located at the end of skb->head, + * and should not be copied to/from user. + */ + skb_small_head_cache = kmem_cache_create_usercopy("skbuff_small_head", SKB_SMALL_HEAD_CACHE_SIZE, 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, + 0, + SKB_SMALL_HEAD_HEADROOM, NULL); #endif skb_extensions_init(); |