linux-kernel - Re: CGroup Namespaces (v4)

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Message-ID: <20151118154306.GA24719@mail.hallyn.com>
Date:	Wed, 18 Nov 2015 09:43:06 -0600
From:	"Serge E. Hallyn" <serge.hallyn@...ntu.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	Richard Weinberger <richard@....at>,
	Richard Weinberger <richard.weinberger@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"open list:ABI/API" <linux-api@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	LXC development mailing-list 
	<lxc-devel@...ts.linuxcontainers.org>, Tejun Heo <tj@...nel.org>,
	cgroups mailinglist <cgroups@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: CGroup Namespaces (v4)

On Wed, Nov 18, 2015 at 03:18:44AM -0600, Eric W. Biederman wrote:
> "Serge E. Hallyn" <serge@...lyn.com> writes:
> 
> > On Mon, Nov 16, 2015 at 04:24:27PM -0600, Eric W. Biederman wrote:
> >> Similary have you considered what it required to be able to safely set
> >> FS_USERNS_MOUNT?
> >
> > I pushed the one patch which I feel is needed to my branch (it's also
> > included in another reply).  Aditya had already added FS_USERNS_MOUNT to
> > the cgroup fs flags, so I think we're now all set.  I can start
> > unprivileged containers which mount cgroupfs (which make systemd happy).
> 
> In principle that sounds very good, and I am glad to see that.
> 
> Let's hold off on merging the unprivileged part until everything else is
> reviewed and merged and we have performed an extra hard look at the
> security implications as it can be easy to overlook something when
> relaxing the permissions.

I'll break out the FS_USERNS_MOUNT flag into the very last patch.
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