RHBA-2014:0193 - Bug Fix Advisory

Topic

Updated libvirt packages that fix several bugs are now available for Red Hat
Enterprise Linux 6.

Description

The libvirt library is a C API for managing and interacting with the
virtualization capabilities of Linux and other operating systems. In addition,
libvirt provides tools for remote management of virtualized systems.

This update fixes the following bugs:

• Previously, in the brief instance between declaring that a guest had been

migrated and performing the guest removal, migration of transient guests
returned the default virDomainBlockInfo() "allocation" value for a qcow2 block
backed device instead of the actual value from a virDomainGetBlockInfo()
function call. Consequently, applications expecting a non-default value to be
returned, occasionally took an incorrect action, for example, extending the
logical volume instead of the physical. After this update, the
virDomainGetBlockInfo() function fails with the "domain is not running" error,
for a transient domain once the migration has successfully completed and before
the domain is destroyed on the source. (BZ#1059904)

• A change in the dnsmasq options was causing DNS requests for names in the

configured domain of a libvirt network, but not known by libvirt's instance of
dnsmasq, to return "not found" to the virtual guests, rather than forwarding
those DNS requests to an upstream server for a potential resolution. To fix this
bug, libvirt now adds "--domain-needed" and "--local=//" to the dnsmasq options
only if the "dns" element from network configuration contains:

forwardPlainNames='no'

Additionally, libvirt will no longer add "--local=/domainname/" to the
dnsmasq options under any circumstances. As a result, all locally unresolved DNS
requests for hosts in all domains are forwarded to the host's DNS resolver for a
potential resolution. (BZ#1062708)

Users of libvirt are advised to upgrade to these updated packages, which fix
these bugs. After installing the updated packages, libvirtd will be restarted
automatically.

Solution

Before applying this update, make sure all previously-released errata relevant
to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red
Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.5 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.5 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.5 ppc64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Virtualization 3 for RHEL 6 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux EUS Compute Node 6.5 x86_64
• Red Hat Enterprise Linux Server - AUS 6.5 x86_64
• Red Hat Enterprise Linux Server - TUS 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 1059904 - Inconsistent blockInfo values when the VM is finalizing live migration

CVEs

(none)

References

(none)