RHBA-2014:1535 - Bug Fix Advisory

Topic

Updated avahi packages that fix several bugs are now available for Red Hat
Enterprise Linux 6.

Description

Avahi is an implementation of the DNS Service Discovery and Multicast DNS
specifications for Zero Configuration Networking. It facilitates service
discovery on a local network. Avahi and Avahi-aware applications allow you to
plug your computer into a network and, with no configuration, view other people
to chat with, view printers to print to, and find shared files on other
computers.

This update fixes the following bugs:

• Previously, when the ARCOUNT field in the DNS Response Header contained a

non-zero value, avahi-daemon performed a check and logged errors about invalid
DNS packets being received. Note that a non-zero value of ARCOUNT is an
indication of additional data sections in the DNS packet, but avahi-daemon does
not interpret them. As a consequence, avahi-daemon was not sufficiently
interoperable with other mDNS/DNS-SD implementations, and the automatic service
discovery thus did not provide the user with the expected results on some
platforms. Additionally, avahi-daemon logged inaccurate information which
cluttered log files. The redundant check has been removed, and the described
situation no longer occurs. (BZ#768708, BZ#885849)

• Previously, various options such as maximum count of cached resource records

or numerous options related to handling of connected clients to the avahi-daemon
could not be configured. As a consequence, in large networks, the avahi-daemon
could reach the upper bound of some internal limits. In addition, the
avahi-daemon was exhibiting erroneous behavior, such as logging error messages
and failing to discover some services in large networks. To fix this bug,
support for configuring various internal limits has been introduced with the
following newly added options: cache-entries-max, clients-max,
objects-per-client-max, entries-per-entry-group-max. For details about these
options, see the avahi-daemon.conf(5) manual page. (BZ#1074028)

Users of avahi are advised to upgrade to these updated packages, which fix these
bugs. After installing the update, avahi-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/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 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 IBM z Systems 6 s390x
• 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 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• 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
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

CVEs

(none)

References

(none)