linux-kernel - Re: [PATCH 8/8] Add FS_USERNS

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Date:	Tue, 16 Feb 2016 13:05:51 -0500
From:	Tejun Heo <tj@...nel.org>
To:	serge.hallyn@...ntu.com
Cc:	linux-kernel@...r.kernel.org, adityakali@...gle.com,
	linux-api@...r.kernel.org, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, lxc-devel@...ts.linuxcontainers.org,
	akpm@...ux-foundation.org, ebiederm@...ssion.com,
	gregkh@...uxfoundation.org, lizefan@...wei.com, hannes@...xchg.org,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH 8/8] Add FS_USERNS_FLAG to cgroup fs

On Fri, Jan 29, 2016 at 02:54:11AM -0600, serge.hallyn@...ntu.com wrote:
> From: Serge Hallyn <serge.hallyn@...ntu.com>
> 
> allowing root in a non-init user namespace to mount it.  This should
> now be safe, because
> 
> 1. non-init-root cannot mount a previously unbound subsystem
> 2. the task doing the mount must be privileged with respect to the
>    user namespace owning the cgroup namespace
> 3. the mounted subsystem will have its current cgroup as the root dentry.
>    the permissions will be unchanged, so tasks will receive no new
>    privilege over the cgroups which they did not have on the original
>    mounts.
> 
> Signed-off-by: Serge Hallyn <serge.hallyn@...onical.com>

Applied 1-8 to cgroup/for-4.6-ns w/ trivial stylistic updates.

Thanks.

-- 
tejun