linux-kernel - Re: [PATCH 1/9] Add a user_namespace as creator/owner of uts

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Message-ID: <8559.1298503148@redhat.com>
Date:	Wed, 23 Feb 2011 23:19:08 +0000
From:	David Howells <dhowells@...hat.com>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	dhowells@...hat.com, "Serge E. Hallyn" <serge@...lyn.com>,
	LSM <linux-security-module@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	James Morris <jmorris@...ei.org>,
	Kees Cook <kees.cook@...onical.com>,
	containers@...ts.linux-foundation.org,
	kernel list <linux-kernel@...r.kernel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Michael Kerrisk <mtk.manpages@...il.com>, xemul@...allels.com
Subject: Re: [PATCH 1/9] Add a user_namespace as creator/owner of uts_namespace

Eric W. Biederman <ebiederm@...ssion.com> wrote:

> > Which means that unless the uts_namespace belongs to our user_namespace, we
> > cannot change it.  Is that correct?
> 
> No.  If you are root in a parent namespace you can also change it.

But surely, by definition, if you're a user in this namespace, you can't also
be root in a parent namespace...

For the case I worked through current_user() is a member of current_user_ns()
and can't also be a member of its parent, grandparent, etc. - or can it?

David
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