From: Andrew Morton <akpm@linux-foundation.org>
To: Link Lin <linkl@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>,
"Michael S . Tsirkin" <mst@redhat.com>,
David Hildenbrand <david@kernel.org>,
virtualization@lists.linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, prasin@google.com,
rientjes@google.com, duenwen@google.com, jasowang@redhat.com,
xuanzhuo@linux.alibaba.com,
Ammar Faizi <ammarfaizi2@openresty.com>,
jiaqiyan@google.com, ahwilkins@google.com,
Greg Thelen <gthelen@google.com>,
Alexander Duyck <alexander.duyck@gmail.com>,
jthoughton@google.com, stable@vger.kernel.org
Subject: Re: [PATCH v3] mm/page_reporting: use system_freezable_wq to fix UAF during suspend
Date: Wed, 22 Jul 2026 17:36:39 -0700 [thread overview]
Message-ID: <20260722173639.34d3f58413354218b24a5b0d@linux-foundation.org> (raw)
In-Reply-To: <20260721005603.1710551-1-linkl@google.com>
On Tue, 21 Jul 2026 00:55:33 +0000 Link Lin <linkl@google.com> wrote:
> During PM freeze (e.g. S3 suspend or S4 hibernation), device drivers like
> virtio_balloon reset their underlying virtio devices and delete their
> virtqueues via vdev->config->del_vqs().
>
> ...
>
> Fix this by switching page reporting work to system_freezable_wq.
>
> ...
>
Thanks.
> Fixes: 924a663f75e2 ("virtio-balloon: Reporting free page reservations")
hm, now where did that come from. I can find no such commit and that's
the second time this very unusual thing has happened in 30 minutes! I
wonder what's going on.
I'll use
36e66c554b5c ("mm: introduce Reported pages")
OK?
> Cc: stable@vger.kernel.org
The bug is very old so I won't fast-track this fix into 7.2-rcX.
AI review pointed at a possible pre-existing use-after-free issue,
related to virtio-balloon. But I think this is a rephrasing of the
issue it flagged against your v2 patch.
https://sashiko.dev/#/patchset/20260721005603.1710551-1-linkl@google.com
next prev parent reply other threads:[~2026-07-23 0:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-21 0:55 Link Lin
2026-07-23 0:36 ` Andrew Morton [this message]
2026-07-23 4:07 ` Link Lin
2026-07-23 9:15 ` Michael S. Tsirkin
2026-07-31 20:21 ` Link Lin
2026-08-01 0:16 ` Michael S. Tsirkin
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