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Message-Id: <201103170809.33580.ludwig.nussel@suse.de>
Date: Thu, 17 Mar 2011 08:09:33 +0100
From: Ludwig Nussel <ludwig.nussel@...e.de>
To: oss-security@...ts.openwall.com
Cc: Lars Kurth <lars.kurth@....org>
Subject: CVE Request: xen DoS
Hi,
http://xenbits.xen.org/hg/staging/xen-unstable.hg/rev/c79aae866ad8
Citing https://bugzilla.novell.com/show_bug.cgi?id=679344:
"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."
cu
Ludwig
--
(o_ Ludwig Nussel
//\
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