Bug 688579 – CVE-2011-1166 kernel: xen: x86_64: fix error checking in arch_set_info_guest()

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Bug 688579 - (CVE-2011-1166) CVE-2011-1166 kernel: xen: x86_64: fix error checking in arch_set_info_guest()

Summary:	CVE-2011-1166 kernel: xen: x86_64: fix error checking in arch_set_info_guest()

Status:	CLOSED ERRATA

Aliases:	CVE-2011-1166

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	public=20110314,reported=20110317,sou...
Keywords:	Security

Depends On:	688581 688582
Blocks:
	Show dependency tree / graph

Reported:	2011-03-17 08:13 EDT by Eugene Teo (Security Response)
Modified:	2015-07-31 02:38 EDT (History)
CC List:	12 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-07-29 10:11:27 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Local compressed copy of NetBSD kernel linked in comment 5. (1.54 MB, application/x-xz) 2011-04-18 04:55 EDT, Laszlo Ersek	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0833	normal	SHIPPED_LIVE	Important: kernel security and bug fix update	2011-05-31 10:05:42 EDT

Groups: None (edit)

Description Eugene Teo (Security Response) 2011-03-17 08:13:11 EDT

Cannot specify user mode execution without specifying user-mode pagetables.

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. This affects 64-bit version of kernel-xen.

Upstream commit:
http://xenbits.xen.org/hg/staging/xen-unstable.hg/rev/c79aae866ad8

Reference:
https://bugzilla.novell.com/show_bug.cgi?id=679344

Comment 15 errata-xmlrpc 2011-05-31 10:07:06 EDT

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:0833 https://rhn.redhat.com/errata/RHSA-2011-0833.html

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