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

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Message-ID: <87bmusbqr4.fsf@ashishki-desk.ger.corp.intel.com>
Date:   Fri, 27 Jan 2017 15:02:07 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: perf: use-after-free in perf_event_for_each

Peter Zijlstra <peterz@...radead.org> writes:

> 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
>> 
>> BUG: KASAN: use-after-free in perf_event_for_each_child+0x15f/0x180
>> kernel/events/core.c:4495 at addr ffff8800680ec248
>
> The below seems to fix things for me.

FWIW,
Reviewed-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>