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

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Message-ID: <20170313100233.fgbocbi7uwywmofj@linutronix.de>
Date:   Mon, 13 Mar 2017 11:02:34 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Davidlohr Bueso <dave@...olabs.net>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: futex: use-after-free in futex_wait_requeue_pi

On 2017-03-13 09:06:20 [+0100], Peter Zijlstra wrote:
> On Fri, Mar 10, 2017 at 07:10:30PM +0100, Dmitry Vyukov wrote:
> > The following program triggers use-after-free in futex_wait_requeue_pi:
> > https://gist.githubusercontent.com/dvyukov/42e596153263793b75ad587c8d0626b0/raw/35461a6c1b0a4163a67191ff5d35202f35ecbf44/gistfile1.txt
> There's a known use-after-free there, see:
> I've not woken up enough; or actually looked at your report to see if
> its the same.

It seems so, yes. The test-case triggered on the commit mentioned in
less than a minute and after the patch applied it runs now for 16
without complains.
A stable tag would be nice then :)

Sebastian