Re: PING^7 (was Re: [PATCH v2 00/14] Corrections and customizationof the SG_IO command whitelist (CVE-2012-4542))

From: Paolo Bonzini
Date: Wed May 22 2013 - 16:37:13 EST

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).

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