Re: CGroup Namespaces (v4)

["Serge E. Hallyn" <serge.hallyn-GeWIH/nMZzLQT0dZR+AlfA@public.gmane.org>]

On Wed, Nov 18, 2015 at 03:18:44AM -0600, Eric W. Biederman wrote:
> "Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org> 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.