[kernel-hardening] Re: taskstats root only breaking iotop

[Adrian Bunk <bunk@stusta.de>]

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@linux-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

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