linux-kernel - Re: [RFC PATCH 1/2] devices cgroup: allow can_attach() if ns

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Message-ID: <20131024105745.GC13159@mtj.dyndns.org>
Date:	Thu, 24 Oct 2013 11:57:45 +0100
From:	Tejun Heo <tj@...nel.org>
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	Serge Hallyn <serge.hallyn@...ntu.com>,
	Containers <containers@...ts.linux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/2] devices cgroup: allow can_attach() if ns_capable

On Wed, Oct 23, 2013 at 12:41:30AM +0000, Serge E. Hallyn wrote:
> Quoting Tejun Heo (tj@...nel.org):
> > On Tue, Jul 23, 2013 at 2:38 PM, Serge Hallyn <serge.hallyn@...ntu.com> wrote:
> > > This doesn't delegate it into the container.  It allows me, on the host,
> > > to set the cgroup for a container.
> > 
> > Hmmm? I'm a bit confused. Isn't the description saying that the patch
> > allows pseudo-root in userns to change cgroup membership even if it
> > isn't actually root?
> > 
> > Besides, I find the whole check rather bogus and would actually much
> > prefer just nuking the check and just follow the standard permission
> > checks.
> 
> Can we please nuke it like this then?
> 
> From b840083ec8fa1f0645ae925c79db3dc51edd019c Mon Sep 17 00:00:00 2001
> From: Serge Hallyn <serge.hallyn@...ntu.com>
> Date: Wed, 23 Oct 2013 01:34:00 +0200
> Subject: [PATCH 1/1] device_cgroup: remove can_attach
> 
> It is really only wanting to duplicate a check which is already done by the
> cgroup subsystem.
> 
> With this patch, user jdoe still cannot move pid 1 into a devices cgroup
> he owns, but now he can move his own other tasks into devices cgroups.
> 
> Signed-off-by: Serge Hallyn <serge.hallyn@...ntu.com>
> Cc: Aristeu Rozanski <aris@...hat.com>
> Cc: Tejun Heo <tj@...nel.org>

Applied to cgroup/for-3.13.  Thanks.

-- 
tejun
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