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Date: Thu, 14 Jun 2012 20:20:07 +0200
From: Florian Weimer <>
Subject: Re: Xen Security Advisory 9 (CVE-2012-2934) - PV guest host DoS (AMD erratum #121)

* Xen org security team:

> There is no software fix for this issue. The workaround suggested by
> AMD in erratum #121 cannot be applied to Xen since the relevant address
> is under guest control.
> Applying the patch will cause Xen to detect vulnerable systems and
> refuse to boot.

This response puzzles me.  Isn't this changing a potential denial of
service (a para-virtualized guest could attempt an exploit) to a
definite one (the system won't boot)?  Why is this a good idea?

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