netdev - Re: [PATCH 2/2] net: Implement SO_PASSCGROUP to enable passing cgroup path

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Date:	Wed, 16 Apr 2014 12:54:01 -0400
From:	Simo Sorce <ssorce@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	David Miller <davem@...emloft.net>,
	Vivek Goyal <vgoyal@...hat.com>,
	Daniel Walsh <dwalsh@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lpoetter@...hat.com, cgroups@...r.kernel.org, kay@...hat.com,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] net: Implement SO_PASSCGROUP to enable passing
 cgroup path

On Wed, 2014-04-16 at 12:21 -0400, Tejun Heo wrote:
> Hello,
> 
> On Wed, Apr 16, 2014 at 12:13:57PM -0400, Simo Sorce wrote:
> > The only one that *may* be reasonable is the "secret" cgroup name one,
> > however nobody seem to come up with a reason why it is legitimate to
> > allow to keep cgroup names secret.
> 
> Ugh, please don't play security games with cgroup names.  It is one of
> the identifying properties of a task, like a pid, and will be used in
> other parts of the kernel to match groups of tasks.  If we play
> security peekaboo with cgroup names, it has to be transitive and puts
> burdens on all its future uses.  Unless there are *REALLY* strong
> rationales, which can also justify hiding pids, this isn't happening.

FWIW, I totally agree with you, it's Andy Lutomirski that is coming up
with this "secret" cgropus name idea, nobody else (so far) seem to agree
it makes sense.

Simo.


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