RHBA-2013:0310 - Bug Fix Advisory

Topic

Updated libusb1 packages that fix two bugs are now available for Red Hat
Enterprise Linux 6.

Description

The libusb1 packages provide a library to communicate with USB devices from
userspace.

This update fixes the following bugs:

• Prior to this update, the usbredir network protocol caused a conflict with the

libusb library. As a consequence, SPICE USB-redirection failed with the
following errors in the virt-viewer tool: usbredirhost error: submitting bulk
transfer on ep 02: -1" when trying to redirect one USB device to two guests
simultaneously. This update modifies the underlying code to send the error
message "Device is busy" and fail after the second attempt. (BZ#820205)

• Prior to this update, USB Request Blocks (URBs) from the user space were not

allowed to have transfer buffers larger than an arbitrary maximum. As a
consequence, attempting to redirect certain USB mass-storage devices could fail.
This update modifies the underlying code to allow programs to submit URBs of any
size. If there is not sufficient memory available, the submission fails with an
ENOMEM error. In addition, this update also replaces the old limits on
individual transfer buffers with a single global limit of 16MB on the total
amount of memory in use by the USB file system (usbfs) to prevent programs from
submitting a lot of small URBs and so using all the DMA-able kernel memory.
(BZ#830751)

All users of libusb1 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 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 Power, big endian 6 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 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 - 820205 - Errors displayed when share one USB device to two guests simultaneously

CVEs

(none)

References

(none)