Bug 656206 – CVE-2010-4247 xen: request-processing loop is unbounded in blkback

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Bug 656206 - (CVE-2010-4247) CVE-2010-4247 xen: request-processing loop is unbounded in blkback

Summary:	CVE-2010-4247 xen: request-processing loop is unbounded in blkback

Status:	CLOSED ERRATA

Aliases:	CVE-2010-4247

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=20080118,reported=20101123,sou...
Keywords:	Security

Depends On:	654546 656208
Blocks:
	Show dependency tree / graph

Reported:	2010-11-23 03:32 EST by Eugene Teo (Security Response)
Modified:	2015-07-29 09:23 EDT (History)
CC List:	8 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-07-29 09:23:13 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)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0004	normal	SHIPPED_LIVE	Important: kernel security, bug fix, and enhancement update	2011-01-04 11:52:05 EST

Groups: None (edit)

Description Eugene Teo (Security Response) 2010-11-23 03:32:02 EST

If the frontend pass a bad index of production request, the backend will enter an endless loop and then cause a excessive CPU consumption.

This issue has been fixed in upstream by:
changeset:   391:77f831cbb91d
user:        Keir Fraser <keir.fraser@citrix.com>
date:        Fri Jan 18 16:52:25 2008 +0000
summary:     blkback: Request-processing loop is unbounded and hence requires a
http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/77f831cbb91d

changeset:   392:7070d34f251c
user:        Keir Fraser <keir.fraser@citrix.com>
date:        Mon Jan 21 11:43:31 2008 +0000
summary:     blkback/blktap: Check for kthread_should_stop() in inner loop,
http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/7070d34f251c

Version-Release number of selected component (if applicable):
2.6.18-194.el5xen

How reproducible:

Steps to Reproduce:
1. build a guest kernel with the patch attached.
2. run domU with the patched kernel

Actual results:
Dom0 got hung.

Expected results:
Dom0 shouldn't be impacted by a bad guest.

Comment 4 errata-xmlrpc 2011-01-04 11:53:13 EST

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:0004 https://rhn.redhat.com/errata/RHSA-2011-0004.html

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