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| author | Breno Leitao <leitao@debian.org> | 2023-02-23 17:43:53 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-04-03 15:16:14 +0200 |
| commit | e1fe7ee885dc0712e982ee465d9f8b96254c30c1 (patch) | |
| tree | 855f06df7edca5065d29434d55ccd5d3f5423525 /io_uring/alloc_cache.h | |
| parent | io_uring: Move from hlist to io_wq_work_node (diff) | |
| download | linux-e1fe7ee885dc0712e982ee465d9f8b96254c30c1.tar.xz linux-e1fe7ee885dc0712e982ee465d9f8b96254c30c1.zip | |
io_uring: Add KASAN support for alloc_caches
Add support for KASAN in the alloc_caches (apoll and netmsg_cache).
Thus, if something touches the unused caches, it will raise a KASAN
warning/exception.
It poisons the object when the object is put to the cache, and unpoisons
it when the object is gotten or freed.
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://lore.kernel.org/r/20230223164353.2839177-2-leitao@debian.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/alloc_cache.h')
| -rw-r--r-- | io_uring/alloc_cache.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h index aaa838c31d92..2fbecaa3a1ba 100644 --- a/io_uring/alloc_cache.h +++ b/io_uring/alloc_cache.h @@ -16,6 +16,8 @@ static inline bool io_alloc_cache_put(struct io_alloc_cache *cache, if (cache->nr_cached < IO_ALLOC_CACHE_MAX) { cache->nr_cached++; wq_stack_add_head(&entry->node, &cache->list); + /* KASAN poisons object */ + kasan_slab_free_mempool(entry); return true; } return false; @@ -27,6 +29,7 @@ static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *c struct io_cache_entry *entry; entry = container_of(cache->list.next, struct io_cache_entry, node); + kasan_unpoison_range(entry, cache->elem_size); cache->list.next = cache->list.next->next; cache->nr_cached--; return entry; @@ -35,10 +38,11 @@ static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *c return NULL; } -static inline void io_alloc_cache_init(struct io_alloc_cache *cache) +static inline void io_alloc_cache_init(struct io_alloc_cache *cache, size_t size) { cache->list.next = NULL; cache->nr_cached = 0; + cache->elem_size = size; } static inline void io_alloc_cache_free(struct io_alloc_cache *cache, |