linux-kernel - Re: Introspecting userns relationships to other namespaces?

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Message-ID: <20160709031528.GA25507@odin.tremily.us>
Date:	Fri, 8 Jul 2016 20:15:28 -0700
From:	"W. Trevor King" <wking@...mily.us>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Linux API <linux-api@...r.kernel.org>,
	Containers <containers@...ts.linux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>, criu@...nvz.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: Introspecting userns relationships to other namespaces?

On Thu, Jul 07, 2016 at 08:01:52AM -0700, James Bottomley wrote:
> In theory, we could get nsfs to show this information as an option
> (just add a show_options entry to the superblock ops), but the
> problem is that although each namespace has a parent user_ns,
> there's no way to get it without digging in the namespace specific
> structure.  Probably we should restructure to move it into
> ns_common, then we could display it (and enforce all namespaces
> having owning user_ns) but it would be a reasonably large (but
> mechanical) change.

It sounds like everyone is either positive or or neutral on this
groundwork, even if we haven't decided if/how to expose the
information to userspace.  I'm happy to work up a patch while the rest
of the discussion continues.  I'm also happy to let someone else work
up the patch, if anyone else is chomping at the bit ;).

Cheers,
Trevor

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