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

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Message-ID: <20170313080620.GG3343@twins.programming.kicks-ass.net>
Date:   Mon, 13 Mar 2017 09:06:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, bigeasy@...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 Fri, Mar 10, 2017 at 07:10:30PM +0100, Dmitry Vyukov wrote:
> Hello,
> 
> 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:

http://lkml.kernel.org/r/20170304093558.801744246@infradead.org

I've not woken up enough; or actually looked at your report to see if
its the same.