linux-kernel - Re: CGroup Namespaces (v4)

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Message-ID: <20151117035458.GA3158@mail.hallyn.com>
Date:	Mon, 16 Nov 2015 21:54:58 -0600
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.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 Mon, Nov 16, 2015 at 07:40:26PM -0600, Serge E. Hallyn wrote:
> On Mon, Nov 16, 2015 at 07:13:49PM -0600, Serge E. Hallyn wrote:
> > 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 think the only thing we need to do is
> > 
> > 1. go through and make sure that any ability to change mount flags is under
> > capable() (which I have not yet done).  The cgroup_mount() itself checks that
> > flags are not changed, but there may be some subtle way to effect a change
> > that I'm not aware of yet.
> > 
> 
> At least the ability to change the clone_children and release agent through
> remount need to be restricted to init_user_ns root.

No, they can only be changed on a new mount, so these are fine.
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