RHBA-2013:0866 - Bug Fix Advisory

Topic

Updated spice-server packages that fix two bugs are now available for Red Hat
Enterprise Linux 6.

[Updated 30 May 2013]
This advisory has been updated with an accurate description of the problem and
the problem solution for BZ#961427. The package included in this revised update
has not been changed in any way from the package included in the original
advisory.

Description

The Simple Protocol for Independent Computing Environments (SPICE) is a remote
display protocol for virtual environments. SPICE users can access a virtualized
desktop or server from the local system or any system with network access to the
server. SPICE is used in Red Hat Enterprise Linux for viewing virtualized guests
running on the Kernel-based Virtual Machine (KVM) hypervisor or on Red Hat
Enterprise Virtualization Hypervisors.

This update fixes the following bugs:

• If the SPICE source server was streaming video data during a migration

process, the SPICE server could send stream-related messages to the SPICE client
after sending a MSG_MIGRATE message. This is not allowed and the client thus
forwarded a wrong message instead of a MSG_MIGRATE_DATA message to the
destination host. The destination host then aborted the migration. This update
modifies the SPICE server code to ensure that only the MSG_MIGRATE_DATA message
can be sent after sending MSG_MIGRATE and the migration process now successfully
finish. (BZ#956984)

• Under certain circumstances, the SPICE server could abort upon a virtual

machine (VM) migration. This could happen if the VM was being migrated to a new
host after the previous migration to the current host within the same SPICE
client session. Then, if the connection between the original host and the client
was a low bandwidth connection, the new host passed an incorrect connection
bandwidth value to the SPICE client causing the SPICE server to abort. This
update provides a patch addressing this problem and the SPICE server now sends
the correct connection bandwidth value in this scenario. (BZ#961427)

Users of spice-server are advised to upgrade to these updated packages, which
fix these bugs.

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 for x86_64 - Extended Update Support 6.4 x86_64
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.4 x86_64
• 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 - AUS 6.4 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64

Fixes

• BZ - 956984 - video streaming during migration might result in destination aborting
• BZ - 961427 - Spice server aborts after 2 seamless migration

CVEs

(none)

References

(none)