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Bug 1004420

Summary: Backport qcow2 corruption prevention patches
Product: Red Hat Enterprise Linux 6 Reporter: Kevin Wolf <kwolf>
Component: qemu-kvmAssignee: Hanna Czenczek <hreitz>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: high Docs Contact:
Priority: medium    
Version: 6.6CC: 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