From: Jens Axboe <axboe@xxxxxxxxx>
There's an issue with deferred requests through drain, where if we do
need to defer, we're not copying over the sqe_submit state correctly.
This can result in using uninitialized data when we then later go and
submit the deferred request, like this check in __io_submit_sqe():
if (unlikely(s->index >= ctx->sq_entries))
return -EINVAL;
with 's' being uninitialized, we can randomly fail this check. Fix this
by copying sqe_submit state when we defer a request.
Because it was fixed as part of a cleanup series in mainline, before
anyone realized we had this issue. That removed the separate states
of ->index vs ->submit.sqe. That series is not something I was
comfortable putting into stable, hence the much simpler addition.
Here's the patch in the series that fixes the same issue:
commit cf6fd4bd559ee61a4454b161863c8de6f30f8dca
Author: Pavel Begunkov <asml.silence@xxxxxxxxx>
Date: Mon Nov 25 23:14:39 2019 +0300
io_uring: inline struct sqe_submit
Reported-by: Andres Freund <andres@xxxxxxxxxxx>
Reported-by: Tomáš Chaloupka
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/io_uring.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1787,7 +1787,7 @@ static int io_poll_add(struct io_kiocb *
}
static int io_req_defer(struct io_ring_ctx *ctx, struct io_kiocb *req,
- const struct io_uring_sqe *sqe)
+ struct sqe_submit *s)
{
struct io_uring_sqe *sqe_copy;
@@ -1805,7 +1805,8 @@ static int io_req_defer(struct io_ring_c
return 0;
}
- memcpy(sqe_copy, sqe, sizeof(*sqe_copy));
+ memcpy(&req->submit, s, sizeof(*s));
+ memcpy(sqe_copy, s->sqe, sizeof(*sqe_copy));
req->submit.sqe = sqe_copy;
INIT_WORK(&req->work, io_sq_wq_submit_work);
@@ -2114,7 +2115,7 @@ static int io_queue_sqe(struct io_ring_c
{
int ret;
- ret = io_req_defer(ctx, req, s->sqe);
+ ret = io_req_defer(ctx, req, s);
if (ret) {
if (ret != -EIOCBQUEUED) {
io_free_req(req);
