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io_uring: prevent opcode speculation

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sqe->opcode is used for different tables, make sure we santitise it
against speculations.

Cc: stable@vger.kernel.org
Fixes: d3656344fe ("io_uring: add lookup table for various opcode needs")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Li Zetao <lizetao1@huawei.com>
Link: https://lore.kernel.org/r/7eddbf31c8ca0a3947f8ed98271acc2b4349c016.1739568408.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2025-02-14 22:48:15 +00:00 • committed by Jens Axboe
parent 13918315c5
commit 1e988c3fe1
1 changed files with 2 additions and 0 deletions
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2
io_uring/io_uring.c
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@ -2045,6 +2045,8 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
req->opcode = 0;
return io_init_fail_req(req, -EINVAL);
}
opcode = array_index_nospec(opcode, IORING_OP_LAST);
def = &io_issue_defs[opcode];
if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) {
/* enforce forwards compatibility on users */