* [PATCH] fs/io_uring.c: Fix uninitialized variable is referenced in io_submit_sqe
@ 2020-08-13 6:56 Liu Yong
2020-08-13 14:56 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Liu Yong @ 2020-08-13 6:56 UTC (permalink / raw)
To: Jens Axboe; +Cc: linux-block, linux-kernel, linux-fsdevel
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>
---
fs/io_uring.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index be3d595a607f..c1aaee061dae 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:
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] fs/io_uring.c: Fix uninitialized variable is referenced in io_submit_sqe
2020-08-13 6:56 [PATCH] fs/io_uring.c: Fix uninitialized variable is referenced in io_submit_sqe Liu Yong
@ 2020-08-13 14:56 ` Jens Axboe
0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2020-08-13 14:56 UTC (permalink / raw)
To: Liu Yong; +Cc: linux-block, linux-kernel, linux-fsdevel
On 8/13/20 12:56 AM, Liu Yong wrote:
> 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.
Thanks, I'll add this for 5.4-stable, it doesn't affect any kernels newer
than that.
--
Jens Axboe
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-08-13 6:56 [PATCH] fs/io_uring.c: Fix uninitialized variable is referenced in io_submit_sqe Liu Yong
2020-08-13 14:56 ` Jens Axboe
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