Quoting Tejun Heo (tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org):

Hello, Serge.

On Wed, Nov 25, 2015 at 12:01:56AM -0600, Serge E. Hallyn wrote:

quoted

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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