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Message-ID: <20140619053841.GA4689@gremlin.ru>
Date: Thu, 19 Jun 2014 09:38:41 +0400
From: gremlin@...mlin.ru
To: oss-security@...ts.openwall.com
Subject: Re: docker VMM breakout
On 18-Jun-2014 10:05:35 -0400, Daniel J Walsh wrote:
> CONTAINERS DO NOT CONTAIN. Root inside the container == Root
> outside the container.
Really? :-)
> This is true in both libvirt-sandbox/libvirt-lxc and docker.
Have you checked that for anything else?
> We have a long way to go before we can run anything within a
> container without this rule. User Namespace, SELinux or other
> MAC are all required to get us near the point where Container
> Contain.
Have you ever seen OpenVZ?
> People who run services within a container should continue to
> drop privs in the services and run them as UID!=0
Look at this trivial code example...
Classic kernel:
if (!uid)
{
// perform privileged operation here
}
Containers-enabled kernel:
if ( !uid && !container_id ) // container_id: 0 for host
{
// perform privileged operation here
}
How would you bypass this check to get privileged access to anything
outside the container?
--
Alexey V. Vissarionov aka Gremlin from Kremlin <gremlin ПРИ gremlin ТЧК ru>
GPG: 8832FE9FA791F7968AC96E4E909DAC45EF3B1FA8 @ hkp://keys.gnupg.net
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