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io_uring: prevent speculating sq_array indexing

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The SQ index array consists of user provided indexes, which io_uring
then uses to index the SQ, and so it's susceptible to speculation. For
all other queues io_uring tracks heads and tails in kernel, and they
shouldn't need any special care.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c6c7a25962924a55869e317e4fdb682dfdc6b279.1730687889.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2024-11-04 12:02:47 +00:00 committed by Jens Axboe
parent b6f58a3f4a
commit 483242714f
1 changed files with 1 additions and 0 deletions
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io_uring/io_uring.c
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@ -2245,6 +2245,7 @@ static bool io_get_sqe(struct io_ring_ctx *ctx, const struct io_uring_sqe **sqe)
READ_ONCE(ctx->rings->sq_dropped) + 1);
return false;
}
head = array_index_nospec(head, ctx->sq_entries);
}
/*