This is a note to let you know that I've just added the patch titled
io_uring/rsrc: fix rogue rsrc node grabbing
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io_uring-rsrc-fix-rogue-rsrc-node-grabbing.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4ff0b50de8cabba055efe50bbcb7506c41a69835 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@xxxxxxxxx>
Date: Wed, 29 Mar 2023 15:03:43 +0100
Subject: io_uring/rsrc: fix rogue rsrc node grabbing
From: Pavel Begunkov <asml.silence@xxxxxxxxx>
commit 4ff0b50de8cabba055efe50bbcb7506c41a69835 upstream.
We should not be looking at ctx->rsrc_node and anyhow modifying the node
without holding uring_lock, grabbing references in such a way is not
safe either.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 5106dd6e74ab6 ("io_uring: propagate issue_flags state down to file assignment")
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Link: https://lore.kernel.org/r/1202ede2d7bb90136e3482b2b84aad9ed483e5d6.1680098433.git.asml.silence@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/rsrc.h | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
--- a/io_uring/rsrc.h
+++ b/io_uring/rsrc.h
@@ -144,15 +144,13 @@ static inline void io_req_set_rsrc_node(
unsigned int issue_flags)
{
if (!req->rsrc_node) {
- req->rsrc_node = ctx->rsrc_node;
+ io_ring_submit_lock(ctx, issue_flags);
- if (!(issue_flags & IO_URING_F_UNLOCKED)) {
- lockdep_assert_held(&ctx->uring_lock);
+ lockdep_assert_held(&ctx->uring_lock);
- io_charge_rsrc_node(ctx);
- } else {
- percpu_ref_get(&req->rsrc_node->refs);
- }
+ req->rsrc_node = ctx->rsrc_node;
+ io_charge_rsrc_node(ctx);
+ io_ring_submit_unlock(ctx, issue_flags);
}
}
Patches currently in stable-queue which might be from asml.silence@xxxxxxxxx are
queue-6.2/io_uring-fix-poll-netmsg-alloc-caches.patch
queue-6.2/io_uring-rsrc-fix-rogue-rsrc-node-grabbing.patch
