linux-kernel - Re: [PATCH] kernel/time: Make /proc/timer

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Message-ID: <20101117172111.GX20727@suse.de>
Date:	Wed, 17 Nov 2010 18:21:11 +0100
From:	Marcus Meissner <meissner@...e.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	tglx@...utronix.de, mingo@...e.hu, akpm@...ux-foundation.org,
	rusty@...tcorp.com.au, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/time: Make /proc/timer_list mode 0400

On Wed, Nov 17, 2010 at 06:18:32PM +0100, Peter Zijlstra wrote:
> On Wed, 2010-11-17 at 18:08 +0100, Marcus Meissner wrote:
> > Hi,
> > 
> > /proc/timer_list contains kernel addresses, like e.g.:
> >  #0: <c000000001404158>, tick_sched_timer, S:01, .tick_nohz_restart_sched_tick, swapper/0
> >  ...
> > 
> > Avoid leaking them to user space to make writing kernel exploits a bit harder.
> > 
> > (I currently cannot think of a userland tool that uses this, this is
> > likely pretty much root-only.)
> 
> iirc powertop parses this..

powertop already says on startup:

	PowerTOP needs to be run as root to collect enough information

And as developer tool it usually is for people having root access.

Ciao, Marcus
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