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From: Tejun Heo <tj@kernel.org>
To: David Carlier <devnexen@gmail.com>
Cc: David Vernet <void@manifault.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] sched_ext: Fix TOCTOU on p->scx.dsq in scx_dump_task()
Date: Fri, 27 Feb 2026 08:33:24 -1000	[thread overview]
Message-ID: <aaHjdGZ6QypFiOc_@slm.duckdns.org> (raw)
In-Reply-To: <20260226052640.7191-2-devnexen@gmail.com>

On Thu, Feb 26, 2026 at 05:26:40AM +0000, David Carlier wrote:
> p->scx.dsq is checked for NULL then dereferenced without
> synchronization. Another CPU can NULL the pointer between the check
> and the use. Use READ_ONCE() to capture the pointer into a local
> variable before dereferencing.

Aren't we holding rq lock for the task? David, are these patches AI
generated? I'm not against AI generated patches but a human gotta verify it
end-to-end.

Thanks.

-- 
tejun

  reply	other threads:[~2026-02-27 18:33 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-26  5:26 [PATCH 1/2] sched_ext: Use rcu_dereference() for scx_root in dump paths David Carlier
2026-02-26  5:26 ` [PATCH 2/2] sched_ext: Fix TOCTOU on p->scx.dsq in scx_dump_task() David Carlier
2026-02-27 18:33   ` Tejun Heo [this message]
2026-02-27 18:41     ` David CARLIER
2026-02-27 18:31 ` [PATCH 1/2] sched_ext: Use rcu_dereference() for scx_root in dump paths Tejun Heo
2026-02-27 19:04   ` David CARLIER

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