netdev - Re: [systemd-devel] [PATCH] netns: unix: only allow to find out unix socket in same net namespace

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Date:	Wed, 21 Aug 2013 11:51:53 +0200
From:	Kay Sievers <kay@...y.org>
To:	Gao feng <gaofeng@...fujitsu.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	systemd-devel@...ts.freedesktop.org,
	"libvir-list@...hat.com" <libvir-list@...hat.com>,
	netdev@...r.kernel.org,
	Linux Containers <containers@...ts.linux-foundation.org>,
	lxc-devel@...ts.sourceforge.net, davem@...emloft.net
Subject: Re: [systemd-devel] [PATCH] netns: unix: only allow to find out unix
 socket in same net namespace

On Wed, Aug 21, 2013 at 9:22 AM, Gao feng <gaofeng@...fujitsu.com> wrote:
> On 08/21/2013 03:06 PM, Eric W. Biederman wrote:

>> I suspect libvirt should simply not share /run or any other normally
>> writable directory with the host.  Sharing /run /var/run or even /tmp
>> seems extremely dubious if you want some kind of containment, and
>> without strange things spilling through.

Right, /run or /var cannot be shared. It's not only about sockets,
many other things will also go really wrong that way.

> right now I only take note of the unix socket /run/systemd/private,
> but there may have many similar unix sockets, they can exist in any
> path. the strange problems will still happen.
>
> anyway, I will send a patch to setup a fresh tmpfs for the /run directory of
> container first.

This is what systemd-nspawn does for a container setup:
  http://cgit.freedesktop.org/systemd/systemd/tree/src/nspawn/nspawn.c#n350

Kay
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