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skbuff: use mempool KASAN hooks 

Instead of using slab-internal KASAN hooks for poisoning and unpoisoning
cached objects, use the proper mempool KASAN hooks.

Also check the return value of kasan_mempool_poison_object to prevent
double-free and invali-free bugs.

Link: https://lkml.kernel.org/r/a3482c41395c69baa80eb59dbb06beef213d2a14.1703024586.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 23:29:04 +01:00 committed by Andrew Morton
parent 1ce9a05239
commit 74e831af16
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
net/core/skbuff.c
View File

@ -337,7 +337,7 @@ static struct sk_buff *napi_skb_cache_get(void)
}
skb = nc->skb_cache[--nc->skb_count];
kasan_unpoison_new_object(skbuff_cache, skb);
kasan_mempool_unpoison_object(skb, kmem_cache_size(skbuff_cache));
return skb;
}
@ -1309,13 +1309,15 @@ static void napi_skb_cache_put(struct sk_buff *skb)
struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);
u32 i;
kasan_poison_new_object(skbuff_cache, skb);
if (!kasan_mempool_poison_object(skb))
return;
nc->skb_cache[nc->skb_count++] = skb;
if (unlikely(nc->skb_count == NAPI_SKB_CACHE_SIZE)) {
for (i = NAPI_SKB_CACHE_HALF; i < NAPI_SKB_CACHE_SIZE; i++)
kasan_unpoison_new_object(skbuff_cache,
nc->skb_cache[i]);
kasan_mempool_unpoison_object(nc->skb_cache[i],
kmem_cache_size(skbuff_cache));
kmem_cache_free_bulk(skbuff_cache, NAPI_SKB_CACHE_HALF,
nc->skb_cache + NAPI_SKB_CACHE_HALF);