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Code Issues Releases Wiki Activity

io_uring: fix false positive KASAN warnings

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io_req_local_work_add() peeks into the work list, which can be executed
in the meanwhile. It's completely fine without KASAN as we're in an RCU
read section and it's SLAB_TYPESAFE_BY_RCU. With KASAN though it may
trigger a false positive warning because internal io_uring caches are
sanitised.

Remove sanitisation from the io_uring request cache for now.

Cc: stable@vger.kernel.org
Fixes: 8751d15426 ("io_uring: reduce scheduling due to tw")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c6fbf7a82a341e66a0007c76eefd9d57f2d3ba51.1691541473.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2023-08-09 13:22:16 +01:00 committed by Jens Axboe
parent cfdbaa3a29
commit 569f5308e5
2 changed files with 0 additions and 2 deletions
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1
io_uring/io_uring.c
View file

@ -229,7 +229,6 @@ 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)

1
io_uring/io_uring.h
View file

@ -354,7 +354,6 @@ static inline struct io_kiocb *io_extract_req(struct io_ring_ctx *ctx)
struct io_kiocb *req;
req = container_of(ctx->submit_state.free_list.next, struct io_kiocb, comp_list);
kasan_unpoison_object_data(req_cachep, req);
wq_stack_extract(&ctx->submit_state.free_list);
return req;
}