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Message-ID: <20111003123158.GA28898@localhost.pp.htv.fi>
Date: Mon, 3 Oct 2011 15:31:58 +0300
From: Adrian Bunk <bunk@...sta.de>
To: Vasiliy Kulikov <segoon@...nwall.com>
Cc: Guillaume Chazarain <guichaz@...il.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Balbir Singh <bsingharora@...il.com>,
kernel-hardening@...ts.openwall.com
Subject: Re: taskstats root only breaking iotop
On Sun, Oct 02, 2011 at 02:54:57PM +0400, Vasiliy Kulikov wrote:
> (cc'ed kernel-hardening)
>
> On Sun, Oct 02, 2011 at 12:22 +0200, Guillaume Chazarain wrote:
> > On Sun, Oct 2, 2011 at 2:20 AM, Linus Torvalds
> > <torvalds@...ux-foundation.org> wrote:
> > > So I don't see why you ask for it. What could possibly be a valid use-case?
> >
> > Right, kbyte granularity is enough.
>
> It is not enough. In some border cases an attacker may still learn
> private information given the counters with _arbitrary_ granularity:
>
> http://www.openwall.com/lists/oss-security/2011/06/29/9
If you request a CVE for that, shouldn't there also be a CVE for
/proc/<pid>/cmdline being readable by all users?
I'd expect "ps -ef" to be more likely to give private information to an
attacker than counters with kbyte granularity, or am I wrong on that?
>...
> Thanks,
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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