netdev - Re: [GIT PULL] Namespace file descriptors for 2.6.40

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Date:	Thu, 26 May 2011 00:11:25 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	C Anthony Risinger <anthony@...x.me>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Namespace file descriptors for 2.6.40

2011/5/25 C Anthony Risinger <anthony@...x.me>:
> On Wed, May 25, 2011 at 4:38 PM, Serge E. Hallyn <serge@...lyn.com> wrote:
>> Quoting C Anthony Risinger (anthony@...x.me):
[...]
>>> if i understand correctly, mount namespaces (for example), allow one
>>> to build such constructs as "private /tmp" and similar that even
>>> `root` cannot access ... and there are many reasons `root` does not
>>> deserve to completely know/interact with user processes (FUSE makes a
>>> good example ... just because i [user] have SSH access to a machine,
>>> why should `root`?)
>> If for instance you have a file open in your private /tmp, then root
>> in another mounts ns can open the file through /proc/$$/fd/N anyway.
>> If it's a directory, he can now traverse the whole fs.
> aaah right :-( ... there's always another way isn't there ... curse
> you Linux for being so flexible! (just kidding baby i love you)
>
> this seems like a more fundamental issue then?  or should i not expect
> to be able to achieve separation like this?  i ask in the context of
> OS virt via cgroups + namespaces, eg. LXC et al, because i'm about to
> perform a massive overhaul to our crusty sub-2.6.18 infrastructure and
> i've used/followed these technologies for couple years now ... and
> it's starting to feel like "the right time".

You either trust the admin or don't use the machine. There is no third way.

Best Regards,
Michał Mirosław
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