From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1751087AbdCMIGb (ORCPT <rfc822;w@1wt.eu>);
        Mon, 13 Mar 2017 04:06:31 -0400
Received: from bombadil.infradead.org ([65.50.211.133]:38988 "EHLO
        bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1750757AbdCMIG1 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 13 Mar 2017 04:06:27 -0400
Date: Mon, 13 Mar 2017 09:06:20 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, bigeasy@linutronix.de,
        Davidlohr Bueso <dave@stgolabs.net>, Ingo Molnar <mingo@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        syzkaller <syzkaller@googlegroups.com>
Subject: Re: futex: use-after-free in futex_wait_requeue_pi
Message-ID: <20170313080620.GG3343@twins.programming.kicks-ass.net>
References: <CACT4Y+bWALT2BZmHO+P6a17pEo0KRcA_i9CQQ1+z3FYLiyk-mw@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CACT4Y+bWALT2BZmHO+P6a17pEo0KRcA_i9CQQ1+z3FYLiyk-mw@mail.gmail.com>
User-Agent: Mutt/1.5.23.1 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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.