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Date: Thu, 17 Mar 2011 08:09:33 +0100
From: Ludwig Nussel <>
Cc: Lars Kurth <>
Subject: CVE Request: xen DoS


"The problem is that a 64-bit guest can get one of its vcpus into
non-kernel mode without first providing a valid non-kernel pagetable.
The iret-into-userspace path has the right checks, but just setting the
context on a fresh vcpu doesn't. :(  The observed failure mode is
usually a hard lockup of the host."


 (o_   Ludwig Nussel
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg)

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