Re: FAILED: patch "[PATCH] io_uring/fs: remove sqe->rw_flags checking from LINKAT" failed to apply to 5.15-stable tree

[Jens Axboe <axboe@kernel.dk>]

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On 10/4/23 8:33 AM, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 5.15-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
> 
> To reproduce the conflict and resubmit, you may use the following commands:
> 
> git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
> git checkout FETCH_HEAD
> git cherry-pick -x a52d4f657568d6458e873f74a9602e022afe666f
> # <resolve conflicts, build, test, etc.>
> git commit -s
> git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023100446-broiler-liquid-20a4@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Here's one that applies (and works) against 5.15-stable, thanks.

-- 
Jens Axboe


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From 6f3d95f8d691f1436c8ba3c14060cdce267bec38 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Wed, 4 Oct 2023 08:43:13 -0600
Subject: [PATCH] io_uring/fs: remove sqe->rw_flags checking from LINKAT

commit a52d4f657568d6458e873f74a9602e022afe666f upstream.

This is unionized with the actual link flags, so they can of course be
set and they will be evaluated further down. If not we fail any LINKAT
that has to set option flags.

Fixes: cf30da90bc3a ("io_uring: add support for IORING_OP_LINKAT")
Cc: stable@vger.kernel.org
Reported-by: Thomas Leonard <talex5@gmail.com>
Link: https://github.com/axboe/liburing/issues/955
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 1519125b9814..d00bedfdadbb 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -4038,7 +4038,7 @@ static int io_linkat_prep(struct io_kiocb *req,
 
 	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
 		return -EINVAL;
-	if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
+	if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in)
 		return -EINVAL;
 	if (unlikely(req->flags & REQ_F_FIXED_FILE))
 		return -EBADF;
-- 
2.40.1