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

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Message-ID: <CAHk-=whxmsa7mnzwe-DV6m26teV32geB-n-aKbYHXNm1k4rVwg@mail.gmail.com>
Date:   Mon, 10 Jan 2022 18:55:10 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Eric Biggers <ebiggers@...nel.org>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Cgroups <cgroups@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        syzbot <syzbot+cdb5dd11c97cc532efad@...kaller.appspotmail.com>
Subject: Re: [PATCH 1/1] psi: Fix uaf issue when psi trigger is destroyed
 while being polled

On Mon, Jan 10, 2022 at 6:51 PM Suren Baghdasaryan <surenb@...gle.com> 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