linux-kernel - Re: CVE-2024-53054: cgroup/bpf: use a dedicated workqueue for cgroup bpf destruction

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Message-ID: <gl75dywfjz5qrxsc6k47445n5a3abwyeq4gssntt4ftl7ev5jj@zz2jshiohpsr>
Date: Wed, 27 Nov 2024 18:37:57 +0100
From: Michal Koutný <mkoutny@...e.com>
To: cve@...nel.org, linux-kernel@...r.kernel.org
Cc: linux-cve-announce@...r.kernel.org
Subject: Re: CVE-2024-53054: cgroup/bpf: use a dedicated workqueue for cgroup
 bpf destruction

Hello.

On Sun, Sep 16, 2001 at 10:00:00PM GMT, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> This issue can be reproduced by the following pressuse test:
> 1. A large number of cpuset cgroups are deleted.
> 2. Set cpu on and off repeatly.
> 3. Set watchdog_thresh repeatly.

The lockup is triggered in this very specific stress testing scenario.
CPU offlining (write holding of cpu_hotplug_lock) is necessary to cause
_this_ lockup. Both 2 and 3 are privileged operations (in a tight loop
to hit the window).

I don't think this qualifies as vulnerability.

Michal

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