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Re: [Xen-devel] Xen 4.0.0x allows for data corruption in Dom0

To: Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Xen 4.0.0x allows for data corruption in Dom0
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Sat, 06 Mar 2010 13:36:15 +0000
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Thread-topic: [Xen-devel] Xen 4.0.0x allows for data corruption in Dom0
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On 06/03/2010 12:02, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote:

> On 06/03/2010 10:12, "Joanna Rutkowska" <joanna@xxxxxxxxxxxxxxxxxxxxxx>
> wrote:
>> It's really interesting how much control does the VM have over the data
>> (and location) that are corrupted in Dom0 -- if it has any control, then
>> it might allow for an interesting VM escape attack perhaps :)
>> Unfortunately we don't have time to investigate this problem any further
>> in our lab.
> Thanks, I'll see if I can repro with your simple setup. It's an interesting
> one since presumably the domU is not doing much other waiting on its
> rootdelay timeout when the corruption manifests. Sounds like the dom0 kernel
> version doesn't matter at all?

Tried a few times and no luck reproducing so far. I hope some other people
on the list also will give it a go, since it's so easy to try it out.

 -- Keir

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