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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1290015231.2109.1083.camel@laptop>
Date:	Wed, 17 Nov 2010 18:33:51 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Marcus Meissner <meissner@...e.de>
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, 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 ;-)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/