RHBA-2013:0346 - Bug Fix Advisory

Topic

Updated usbredir packages that fix several bugs and add various enhancements are
now available for Red Hat Enterprise Linux 6.

Description

The usbredir packages provide a protocol for redirection of USB traffic from a
single USB device to a different virtual machine then the one to which the USB
device is attached. The usbredir packages contain a number of libraries to help
implement support for usbredir.

The usbredir packages have been upgraded to upstream version 0.5.1, which
provides a number of bug fixes and enhancements over the previous version.
(BZ#842356)

This update also fixes the following bugs:

• Due to a bug in the libusbredirhost library, handling of timeouts for bulk

transfers did not work correctly. Consequently, traffic of USB ACM serial port
devices, such as PSTN modems and SmartCard readers, could not be properly
redirected. With this update, no timeout is set on the usb-host side for these
devices and the traffic redirection works as expected. (BZ#834560)

• The usbredir code was allocating an unlimited amount of write buffers.

Consequently, when a USB webcam produced data faster then it could be written
out, the write queue grew boundlessly and the remote-viewer utility used an
enormous amount of RAM. The underlying source code has been modified so that
usbredir now checks how large the write queue is and drops isochronous data
packets when the queue is too long. (BZ#855737)

In addition, this update adds the following enhancement:

• Support for live migration of SPICE USB redirection requires support for state

serialization. This update adds this missing support to the libusbredirparser
library. (BZ#842316)

All users of usbredir are advised to upgrade to these updated packages, which
fix these bugs and add these enhancements.

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 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 Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• 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 Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386

Fixes

• BZ - 834560 - USBredir does not present PSTN modems / SmartCard Readers as serial devices
• BZ - 842316 - Add support to libusbredirparser for state serialization
• BZ - 842356 - Rebase usbredir to latest upstream
• BZ - 855737 - libusbredirhost should not queue unlimited amounts of data, causing oom

CVEs

(none)

References

(none)