From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Marcus Meissner <meissner@suse.de>
Cc: tglx@linutronix.de, mingo@elte.hu, akpm@linux-foundation.org,
rusty@rustcorp.com.au, torvalds@linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] kernel/time: Make /proc/timer_list mode 0400
Date: Wed, 17 Nov 2010 18:33:51 +0100 [thread overview]
Message-ID: <1290015231.2109.1083.camel@laptop> (raw)
In-Reply-To: <20101117172111.GX20727@suse.de>
On Wed, 2010-11-17 at 18:21 +0100, Marcus Meissner wrote:
> 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
I know, but you said you didn't know of a tool that used the file.. now
you do ;-)
next prev parent reply other threads:[~2010-11-17 17:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-17 17:08 [PATCH] kernel/time: Make /proc/timer_list mode 0400 Marcus Meissner
2010-11-17 17:18 ` Peter Zijlstra
2010-11-17 17:21 ` Marcus Meissner
2010-11-17 17:33 ` Peter Zijlstra [this message]
2010-11-30 19:21 ` Pavel Machek
2010-11-17 20:30 ` Andrew Morton
2010-11-17 20:37 ` Thomas Gleixner
2010-11-18 8:12 ` Ingo Molnar
2010-11-18 8:28 ` Eric Dumazet
2010-11-30 19:22 ` Pavel Machek
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