Re: [PATCH 1/1] psi: Fix uaf issue when psi trigger is destroyed while being polled

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To: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: Re: [PATCH 1/1] psi: Fix uaf issue when psi trigger is destroyed while being polled
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 10 Jan 2022 18:55:10 -0800
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>, Eric Biggers <ebiggers@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Zefan Li <lizefan.x@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Juri Lelli <juri.lelli@xxxxxxxxxx>, Vincent Guittot <vincent.guittot@xxxxxxxxxx>, Dietmar Eggemann <dietmar.eggemann@xxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Ben Segall <bsegall@xxxxxxxxxx>, Mel Gorman <mgorman@xxxxxxx>, Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, "open list:DOCUMENTATION" <linux-doc@xxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Cgroups <cgroups@xxxxxxxxxxxxxxx>, Android Kernel Team <kernel-team@xxxxxxxxxxx>, syzbot <syzbot+cdb5dd11c97cc532efad@xxxxxxxxxxxxxxxxxxxxxxxxx>
In-reply-to: <20220111025138.1071848-1-surenb@google.com>
References: <20220111025138.1071848-1-surenb@google.com>

On Mon, Jan 10, 2022 at 6:51 PM Suren Baghdasaryan <surenb@xxxxxxxxxx> wrote:
>
> Fix this by disallowing to redefine an existing psi trigger. If a write
> operation is used on a file descriptor with an already existing psi
> trigger, the operation will fail with EBUSY error.

Looks fine to me. Eric?

I assume I'll get it through the usual channels unless there are issues,

                Linus

References:
- [PATCH 1/1] psi: Fix uaf issue when psi trigger is destroyed while being polled
  - From: Suren Baghdasaryan

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