From: Liu Yong pkfxxxing@gmail.com
the commit <a4d61e66ee4a> ("<io_uring: prevent re-read of sqe->opcode>") caused another vulnerability. After io_get_req(), the sqe_submit struct in req is not initialized, but the following code defaults that req->submit.opcode is available.
Signed-off-by: Liu Yong pkfxxxing@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/io_uring.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c index be3d595a607f4..c1aaee061dae5 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2559,6 +2559,7 @@ static void io_submit_sqe(struct io_ring_ctx *ctx, struct sqe_submit *s, goto err; }
+ memcpy(&req->submit, s, sizeof(*s)); ret = io_req_set_file(ctx, s, state, req); if (unlikely(ret)) { err_req: