linux-kernel - Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer

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Message-ID: <20160308204458.GD7897@krava.redhat.com>
Date:	Tue, 8 Mar 2016 21:44:58 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>, Wang Nan <wangnan0@...wei.com>,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	He Kuang <hekuang@...wei.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>, pi3orama@....com
Subject: Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer

On Tue, Mar 08, 2016 at 09:07:46PM +0100, Peter Zijlstra wrote:
> On Tue, Mar 08, 2016 at 08:56:42PM +0100, Jiri Olsa wrote:
> > > # cat go-fuzz.sh
> > > #!/bin/bash
> > > 
> > > echo 1 > /proc/sys/kernel/traceoff_on_warning
> > > echo 1 > /debug/tracing/options/stacktrace
> > > echo 1 > /debug/tracing/events/sched/enable
> > 
> > are you running this under root?
> 
> Of course ;-) I'm not even sure these machines have a user account.
> 
> Also, what's the point of fuzzing if half your 'fun' options return
> -EPERM.

IIRC the perf fuzzer (one from Vince) could screw your machine having
it run under root

jirka