linux-kernel - Re: futex: use-after-free in futex_wait_requeue

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Message-ID: <CACT4Y+b+rj-PiWHrJUXtxd8KuX-pHK-=_GpsV1m4y_ZrUWbPtQ@mail.gmail.com>
Date:   Fri, 10 Mar 2017 19:32:44 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Davidlohr Bueso <dave@...olabs.net>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: futex: use-after-free in futex_wait_requeue_pi

On Fri, Mar 10, 2017 at 7:30 PM, Sebastian Andrzej Siewior
<bigeasy@...utronix.de> wrote:
> On 2017-03-10 19:10:30 [+0100], Dmitry Vyukov wrote:
>> BUG: KASAN: use-after-free in futex_wait_requeue_pi+0xf5d/0x1160
> …
>> On commit c1aa905a304e4b5e6a3fe112ec62d9c1c7b0c155.
> That is "Merge tag 'pm-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm".
> Are sure about that commit? Does this trigger now and then or is 100%?

I am sure that I've triggered this bug on that commit. I am not saying
that this is the guilty commit.