RHBA-2013:0951 - 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, the listen attribute in QEMU cookie files was discarded.

Consequently, if the user had different networks in use, one for management and
migration, and one for VNC and SPICE, the remote host name was passed to QEMU
via the client_migrate_info flag. This resulted in the SPICE client to be
disconnected upon migration of a virtual machine. With this update, the remote
listen address is passed instead and the SPICE client is no longer disconnected
in the described scenario. (BZ#966587)

• Prior to this update, the F_DUPFD_CLOEXEC operation with the fcntl() function

expected a single argument, specifying the minimum file descriptor (FD) number,
but was provided none. Consequently, random stack data were accessed as the FD
number and a libvirt live migration could then terminate unexpectedly. This
update ensures that the argument is provided in the described scenario, thus
fixing this bug. (BZ#966707)

• When cgroups were enabled, moving tasks among kernel cgroups could, in rare

occurrences, result in a race condition. Consequently, a guest could fail to
start after repeating the start and stop commands tens of times using the virsh
utility. With this update, the code that handles groups of threads has been
optimized to prevent races while moving from one cgroup to another and guests
now start as expected in the described scenario. (BZ#966710)

Users of libvirt are advised to upgrade to these updated packages, which fix
these bugs. After installing the updated packages, the libvirtd daemon 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/knowledge/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 6.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.4 i386
• Red Hat Enterprise Linux Server - AUS 6.4 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 6.4 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.4 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• 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 6.4 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.4 i386
• Red Hat Gluster Storage Server for On-premise 2.1 x86_64
• Red Hat Storage for Public Cloud (via RHUI) 2.1 x86_64
• 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 Workstation 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 966587 - After upgrading hypervisors from 6.3 to 6.4, spice client gets disconnected upon migration of the VM
• BZ - 966707 - libvirt live migration got unexpected fail

CVEs

(none)

References

(none)