RHBA-2013:1008 - Bug Fix Advisory

Topic

Updated kvm packages that fix various bugs are now available for Red Hat
Enterprise Linux 5.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux
on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the
standard Red Hat Enterprise Linux kernel.

This update fixes the following bugs:

• Previously, tb_invalidate_phys_page_range() incurred a segmentation fault

because it walked through an invalid chain of translation blocks. Thus,
page_find() returned an incorrect pointer, which was subsequently used by
tb_invalidate_phys_page_range() to find the head of the translation block chain.
This update corrects the chain of translation blocks and crashes no longer
occur. (BZ#958359)

Users of KVM are advised to upgrade to these updated packages, which fix these
bugs. Note that the procedure in the Solution section must be performed before
this update will take effect.

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/kb/docs/DOC-11259

The following procedure must be performed before this update will take
effect:

1) Stop all KVM guest virtual machines.

2) Either reboot the hypervisor machine or, as the root user, remove (using
"modprobe -r [module]") and reload (using "modprobe [module]") all of the
following modules which are currently running (determined using "lsmod"):
kvm, ksm, kvm-intel or kvm-amd.

3) Restart the KVM guest virtual machines.

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.9 x86_64
• Red Hat Enterprise Linux Server - AUS 5.9 x86_64
• Red Hat Enterprise Linux Workstation 5 x86_64

Fixes

CVEs

(none)

References

(none)