Bug 668478

Summary:	PCI sysfs rom file needs owner write access
Product:	Red Hat Enterprise Linux 6	Reporter:	Alex Williamson <alex.williamson>
Component:	kernel	Assignee:	Alex Williamson <alex.williamson>
Status:	CLOSED ERRATA	QA Contact:	Boris Ranto <branto>
Severity:	medium	Docs Contact:
Priority:	low
Version:	6.0	CC:	branto, qcai, tburke
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	kernel-2.6.32-112.el6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-05-23 20:35:34 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:
Bug Depends On:
Bug Blocks:	580954

Description Alex Williamson 2011-01-10 15:59:08 UTC

Description of problem:
The PCI sysfs rom file is mode 0400, but it's usage requires writing 1/0 to enable/disable the rom around reads.  This causes problems for KVM device assignment, which wants to allow a de-privileged qemu instance to open the file R/W to extract the contents.  libvirt gives qemu ownership of the file, but the mode is wrong for the required usage.

Version-Release number of selected component (if applicable):
kernel-2.6.32-71.4.1.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Give a normal user ownership of the pci sysfs file (/sys/bus/pci/devices/ssss:bb:dd.f/rom)
2. Try to read the rom contents (echo 1 >$ROMFILE; cat $ROMFILE)
3. 
  
Actual results:
cannot read

Expected results:
owner of the file is able to access contents per API

Additional info:

Comment 1 RHEL Program Management 2011-01-12 10:31:08 UTC

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Comment 2 Aristeu Rozanski 2011-02-03 15:40:01 UTC

Patch(es) available on kernel-2.6.32-112.el6

Comment 6 errata-xmlrpc 2011-05-23 20:35:34 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 therefore 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-2011-0542.html