Bug 1004420

Summary:	Backport qcow2 corruption prevention patches
Product:	Red Hat Enterprise Linux 6	Reporter:	Kevin Wolf <kwolf>
Component:	qemu-kvm	Assignee:	Hanna Czenczek <hreitz>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	medium
Version:	6.6	CC:	bsarathy, chayang, cpelland, iheim, juzhang, kwolf, lersek, michen, mkenneth, qzhang, rbalakri, sluo, virt-maint
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	qemu-kvm-0.12.1.2-2.427.el6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	1004347	Environment:
Last Closed:	2014-10-14 06:50:28 UTC	Type:	Bug
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:	1004347
Bug Blocks:	1002699

Description Kevin Wolf 2013-09-04 15:23:01 UTC

Once the RHEL 6.6 tree is open, it would be useful to have it backported there
as well. As it's only prevention, we'll not include it in 6.5.


+++ This bug was initially created as a clone of Bug #1004347 +++

Upstream commits d4ca092a to ca0eca91 implements sanity checks for writes to a
qcow2 image as follows:

> If a qcow2 image file becomes corrupted, any write may inadvertently
> overwrite important metadata structures such as the L1 table. This
> series adds functionality for detecting, preventing and (to some extent)
> repairing such collisions.

This is something that we'll want to have in RHEL 7.

Comment 1 Ayal Baron 2014-01-29 10:03:33 UTC

Please note that this bug affects RHEV customers and we would like to see this in 6.6
Thanks.

Comment 6 Jeff Nelson 2014-05-23 18:08:10 UTC

Fix included in qemu-kvm-0.12.1.2-2.427.el6

Comment 16 Sibiao Luo 2014-08-11 08:58:10 UTC

Verify this issue.

host info:
# uname -r && rpm -q qemu-kvm
2.6.32-491.el6.x86_64
qemu-kvm-0.12.1.2-2.436.el6.x86_64

# rpm -ivh qemu-kvm-0.12.1.2-2.436.el6.src.rpm
# rpmbuild -bp --nodeps /root/rpmbuild/SPECS/qemu-kvm.spec
# tar -zxvf /root/rpmbuild/SOURCES/qemu-kvm-0.12.1.2.tar.gz
qemu-iotests]# pwd
/root/rpmbuild/BUILD/qemu-kvm-0.12.1.2/tests/qemu-iotests
qemu-iotests]# export QEMU_PROG=/usr/libexec/qemu-kvm

qemu-iotests]# ./check -qcow2 060
QEMU          -- /usr/libexec/qemu-kvm
QEMU_IMG      -- /usr/bin/qemu-img
QEMU_IO       -- /usr/bin/qemu-io 
QEMU_NBD      -- 
IMGFMT        -- qcow2
IMGPROTO      -- file
PLATFORM      -- Linux/x86_64 intel-5504-12-2 2.6.32-491.el6.x86_64
SOCKET_SCM_HELPER -- 

060        
Passed all 1 tests

According to above, comment #13 and comment #15, set this issue to VERIFIED status.

Comment 17 errata-xmlrpc 2014-10-14 06:50:28 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1490.html