Bug 218003

Summary:	pci: Unaligned config read/write overflow
Product:	Red Hat Enterprise Linux 5	Reporter:	Herbert Xu <herbert.xu>
Component:	xen	Assignee:	Rik van Riel <riel>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.0	CC:	xen-maint
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RC	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-02-08 01:10:57 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 Herbert Xu 2006-12-01 06:11:08 UTC

Changesets 12586+12649 from xen-unstable.

[QEMU] pci: Unaligned config read/write overflow

The default config read/write handlers allows a 4-byte read/write at
address 255.  This can clobber the field after the config area.  This
happens to be the PCIBus pointer in the PCIDevice structure.

This patch stops this from reducing the read/write to the (largest
multiple of 2) number of bytes within the config area.

Signed-off-by: Herbert Xu <herbert.org.au>

[QEMU] Simpler workaround for guest writes to PCI config
space that extend past byte 0xff.
Signed-off-by: Keir Fraser <keir>

Comment 1 Jay Turner 2006-12-01 14:29:23 UTC

QE ack for RHEL5.

Comment 3 RHEL Program Management 2007-02-08 01:10:57 UTC

A package has been built which should help the problem described in 
this bug report. This report is therefore being closed with a resolution 
of CURRENTRELEASE. You may reopen this bug report if the solution does 
not work for you.