Bug 137822

Summary:	CAN-2004-1057 VM_IO refcount issue
Product:	Red Hat Enterprise Linux 2.1	Reporter:	Josh Bressers <bressers>
Component:	kernel	Assignee:	Jim Paradis <jparadis>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	low	Docs Contact:
Priority:	medium
Version:	2.1	CC:	mjc, peterm, riel, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	ia64
OS:	Linux
Whiteboard:	impact=low,public=20041101
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-01-21 15:41:20 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Josh Bressers 2004-11-01 20:19:57 UTC

Alan Cox told vendor-sec the kernel policy on page locking allows DMA
to and from freed kernel pages/panic kernels because PG_Reserved pages
are not refcounted, but some kernel space gets remapped as driver
buffers.  Known to affect OSS audio, video, usb perhaps.

I'm marking this private for now.

See attachment 106045 [details] for the patch taken from 

http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.23aa3/00_VM_IO-4

Comment 1 Jim Paradis 2004-11-05 22:49:00 UTC

I believe this should be slated for U7

Comment 2 Jim Paradis 2004-12-21 19:13:24 UTC

This patch has just been committed to the RHEL2.1 E7 patch pool (in
kernel version 2.4.18-e.53)

Comment 3 Josh Bressers 2005-01-21 15:41:20 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2005-017.html