linux-kernel - Re: PING^7 (was Re: [PATCH v2 00/14] Corrections and customization of the SG

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Message-ID: <519D2C63.7020002@redhat.com>
Date:	Wed, 22 May 2013 22:36:51 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Theodore Ts'o <tytso@....edu>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Tejun Heo <tj@...nel.org>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: PING^7 (was Re: [PATCH v2 00/14] Corrections and customization
 of the SG_IO command whitelist (CVE-2012-4542))

Il 22/05/2013 22:19, Theodore Ts'o ha scritto:
> On Wed, May 22, 2013 at 09:37:54PM +0200, Paolo Bonzini wrote:
>>> If it's not theoretical, how does the cloud service control who has
>>> access to the CD burner, and how are the disks loaded into the CD
>>> burner?
>>
>> CD burning would be used in a VM that runs on your local workstation, so
>> the VM gets access to the CD burner under your desk.  There was also a
>> developer of a CD burning tool that wanted to test it inside BSD,
>> Solaris and Windows VMs; the idea is the same.
> 
> So in both cases all of the VM's and the host OS are within the same
> trust boundary.  This simplifies the security requirements than in the
> more generic cloud server caser where the VM's are mutually
> suspicious.  This simplifies the requirements of what we need to push
> into the kernel, yes?

What do you mean by "push into the kernel"?

(Anyway the CD burner case is really the only one that the current
whitelist covers completely.  I was just listing it as a use case for
SG_IO in the context as virtualization).

Paolo
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