linux-kernel - Re: [RFC] Unify KVM kernel-space and user-space code into a single project

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Message-ID: <4BAA3BD6.8030401@redhat.com>
Date:	Wed, 24 Mar 2010 18:20:38 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joro@...tes.org>
CC:	"Daniel P. Berrange" <berrange@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, ziteng.huang@...el.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single
 project

On 03/24/2010 06:17 PM, Joerg Roedel wrote:
> On Wed, Mar 24, 2010 at 05:52:54PM +0200, Avi Kivity wrote:
>    
>> On 03/24/2010 05:50 PM, Joerg Roedel wrote:
>>      
>>> If we go the /proc/<pid>/kvm way then the directory should probably
>>> inherit the label from /proc/<pid>/?
>>>        
>> That's a security policy.  The security people like their policies
>> outside the kernel.
>>
>> For example, they may want a label that allows a trace context to read
>> the data, and also qemu itself for introspection.
>>      
> Hm, I am not a security expert.

I'm out of my depth here as well.

> But is this not only one entity more for
> sVirt to handle? I would leave that decision to the sVirt developers.
> Does attaching the same label as for the VM resources mean that root
> could not access it anymore?
>    

IIUC processes run under a context, and there's a policy somewhere that 
tells you which context can access which label (and with what 
permissions).  There was a server on the Internet once that gave you 
root access and invited you to attack it.  No idea if anyone succeeded 
or not (I got bored after about a minute).

So it depends on the policy.  If you attach the same label, that means 
all files with the same label have the same access permissions.  I think.

-- 
error compiling committee.c: too many arguments to function

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