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

[Serge Hallyn]

Quoting Tejun Heo (tj at kernel.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.

> what's necessary is ensuring that namespace scoped mount never creates
> a new hierarchy but always reuses an existing one.
> 
> Thanks.
> 
> -- 
> tejun
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