linux-kernel - Re: perf: use-after-free in perf

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Message-ID: <CACT4Y+YtqAJHx02+tbHmV3wV008B1WhnO5qzMQ_8OTAsMmTf8Q@mail.gmail.com>
Date:   Tue, 7 Mar 2017 10:26:20 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        syzkaller <syzkaller@...glegroups.com>,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: perf: use-after-free in perf_release

On Tue, Mar 7, 2017 at 10:08 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, Mar 06, 2017 at 02:34:50PM +0100, Dmitry Vyukov wrote:
>> FWIW here are 2 syzkaller programs that triggered the bug:
>> https://gist.githubusercontent.com/dvyukov/d67f980050589775237a7fbdff226bec/raw/4bca72861cb2ede64059b6dad403e19f425a361f/gistfile1.txt
>
> Hurm, previously your gistfile thingies were actual C, but this thing is
> gibberish. How do I run it?

The same way we did it here:
https://groups.google.com/d/msg/syzkaller/MHXa-o8foyc/yrGfDOrwAQAJ
This will run it in infinite loop in 10 parallel processes:
./syz-execprog -repeat=0 -procs=10 -sandbox=namespace gistfile1.txt
-sandbox=namespace will require CONFIG_USER_NS=y, I am not sure if it
is actually required, but that's how bots triggered it. You can do
-sandbox=none as well.