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

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Message-ID: <20170124131748.GD6536@twins.programming.kicks-ass.net>
Date:   Tue, 24 Jan 2017 14:17:48 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
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>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: perf: use-after-free in perf_event_for_each

On Mon, Jan 23, 2017 at 06:04:42PM +0100, Peter Zijlstra wrote:
> On Mon, Jan 23, 2017 at 02:30:12PM +0100, Dmitry Vyukov wrote:
> > Hello,
> > 
> > The following program triggers use-after-free in perf_event_for_each:
> > https://gist.githubusercontent.com/dvyukov/f1c354a8356e42f4d0b3d912e1bec956/raw/31d7ecdf6dc2c7327b80ef8581a39c823bbe405d/gistfile1.txt

I've been running 60 concurrent instances of that thing for hours now,
and have not been able to reproduce :-/

I did enable CONFIG_KASAN but otherwise booted as normal, and the thing
says:

[    0.000000] kasan: KernelAddressSanitizer initialized

Is there anything else I should do?

I've ran out of ideas and it would be very helpful if I could prod at
something that fails...