linux-kernel - Re: [PATCH 7/8] cgroup: mount cgroupns-root when inside non-init cgroupns

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Message-ID: <20151125195705.GE14240@htj.duckdns.org>
Date:	Wed, 25 Nov 2015 14:57:05 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Serge Hallyn <serge.hallyn@...ntu.com>
Cc:	linux-api@...r.kernel.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	lxc-devel@...ts.linuxcontainers.org, cgroups@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 7/8] cgroup: mount cgroupns-root when inside non-init
 cgroupns

On Wed, Nov 25, 2015 at 07:55:53PM +0000, Serge Hallyn wrote:
> Quoting Tejun Heo (tj@...nel.org):
> > Hello, Serge.
> > 
> > On Wed, Nov 25, 2015 at 12:01:56AM -0600, Serge E. Hallyn wrote:
> > > that was my goal with https://git.kernel.org/cgit/linux/kernel/git/sergeh/linux-security.git/commit/?h=cgroupns.v4&id=8eb75d2bb24df59e262f050dce567d2332adc5f3
> > > (which was sent inline earlier in this thread in response to Eric)  Does
> > > that look sufficient?
> > 
> > Hmmm... but that wouldn't work with non-root and user ns.  I think
> 
> Are you sure?  IIUC that code block is only hit when we didn't find
> an already-mounted subsystem.

Heh, you're right.  This should work.

Thanks.

-- 
tejun
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