linux-kernel - Re: suspicious RCU usage (perf)

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Message-ID: <20130826150304.090a1025@gandalf.local.home>
Date:	Mon, 26 Aug 2013 15:03:04 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Jones <davej@...hat.com>
Cc:	paulmck@...ux.vnet.ibm.com,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: suspicious RCU usage (perf)

On Mon, 26 Aug 2013 14:29:07 -0400
Dave Jones <davej@...hat.com> wrote:

> On Mon, Aug 26, 2013 at 02:18:14PM -0400, Steven Rostedt wrote:
>  > On Mon, 26 Aug 2013 13:50:12 -0400
>  > Dave Jones <davej@...hat.com> wrote:
>  > > 
>  > > This was triggered as a regular user fwiw.
>  > > I had not been running perf, or any other tracing. It was just left
>  > > fuzzing over the weekend with no interaction at all.
>  > 
>  > So you are telling me that ftrace was enabled by a regular user? If so,
>  > that's a huge issue.
>  
> quite.
> 
>  > So my question to you. If you were not running perf or any other
>  > tracing, and this is all just non-root user. How the hell did perf
>  > function tracing get started on your box????
> 
> What mechanisms are available that would trigger it being enabled ?
> 
> Is there some path through sys_perf_open_event that might be
> missing a capability check perhaps ?
> 

That's a question for Ingo, Peter or Jiri.

-- Steve
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