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

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Message-ID: <20170306124724.GK6500@twins.programming.kicks-ass.net>
Date:   Mon, 6 Mar 2017 13:47:24 +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>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: perf: use-after-free in perf_release

On Mon, Mar 06, 2017 at 01:27:41PM +0100, Dmitry Vyukov wrote:

> I think you will also need the attached patch. It seems that it was
> found due to it. Going to send it out soon.

Yuck, that's nasty. Although I don't see an alternative there.

You might also want to do the bitops, they suffer the same problem.