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

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Message-ID: <20170124134918.GL6500@twins.programming.kicks-ass.net>
Date:   Tue, 24 Jan 2017 14:49:18 +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 Tue, Jan 24, 2017 at 02:29:19PM +0100, Dmitry Vyukov wrote:
> 
> Try to run more parallel processes at the same time.
> This program will run 32 processes in a tight loop:
> https://gist.githubusercontent.com/dvyukov/b36aa4398bb016923278fccdd1cc5b45/raw/9607078fd5ac2daf769c13d82561a83e17b06032/gistfile1.txt
> It triggered the UAF in several minutes for me. I have 4 CPUs in the
> VM. If you have more, set number of processes to 8*CPU.

No VM here, I'll up to 320 processes.