Date: Thu, 14 Jun 2012 20:20:07 +0200 From: Florian Weimer <fw@...eb.enyo.de> To: oss-security@...ts.openwall.com 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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