diff options
| author | Breno Leitao <leitao@debian.org> | 2023-01-18 07:56:30 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-01-29 15:17:41 -0700 |
| commit | c1755c25a7190494b45861284b4a30bd9cd813ff (patch) | |
| tree | 42cb114ed4fb6907e56be37efee960c53f41985d /io_uring/io_uring.c | |
| parent | b5d3ae202fbfe055aa2a8ae8524531ee1dcab717 (diff) | |
io_uring: Enable KASAN for request cache
Every io_uring request is represented by struct io_kiocb, which is
cached locally by io_uring (not SLAB/SLUB) in the list called
submit_state.freelist. This patch simply enabled KASAN for this free
list.
This list is initially created by KMEM_CACHE, but later, managed by
io_uring. This patch basically poisons the objects that are not used
(i.e., they are the free list), and unpoisons it when the object is
allocated/removed from the list.
Touching these poisoned objects while in the freelist will cause a KASAN
warning.
Suggested-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/io_uring.c')
| -rw-r--r-- | io_uring/io_uring.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index c84dce6944db..407834255a59 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -151,7 +151,7 @@ static void io_move_task_work_from_local(struct io_ring_ctx *ctx); static void __io_submit_flush_completions(struct io_ring_ctx *ctx); static __cold void io_fallback_tw(struct io_uring_task *tctx); -static struct kmem_cache *req_cachep; +struct kmem_cache *req_cachep; struct sock *io_uring_get_socket(struct file *file) { @@ -230,6 +230,7 @@ static inline void req_fail_link_node(struct io_kiocb *req, int res) static inline void io_req_add_to_cache(struct io_kiocb *req, struct io_ring_ctx *ctx) { wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); + kasan_poison_object_data(req_cachep, req); } static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref) |