RHBA-2009:1331 - Bug Fix Advisory

Topic

A dhcp update that fixes several bugs is now available.

Description

The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows
individual devices on an IP network to get their own network configuration
information, including an IP address, a subnet mask, and a broadcast
address. The dhcp package provides a relay agent and ISC DHCP service
required to enable and administer DHCP on a network.

This update applies the following updates:

• Supplying an interface name (on the command line) that was longer than

the size declared by the IFNAMSIZ macro caused an unexpected segmentation
fault. This update contains an added process that properly checks the
validity of interface names, which resolves this issue. (BZ#441524)

• This update corrects a bug in the way the dhclient-script file processed

the $localClockFudge variable. In previous releases, this bug caused the
NTPD daemon to restart unexpectedly at times. (BZ#450301)

• dhclient now retains relay agent options when it enters the INIT and

REBIND states. (BZ#450545)

• A bug in the network shutdown code prevented dhclient from correctly

honoring the PEERNTP and PEERDNS variables in
/etc/sysconfig/network-scripts/ifcfg-* files. This caused dhcp to replace a
modified /etc/ntp.conf file with a default version during a network service
restart. This update fixes the bug, ensuring that dhclient-script no longer
replaces the /etc/ntp.conf file upon network service restart if PEERNTP and
PEERDNS are both set to 'yes'. (BZ#471543)

• The dhcpd and dhcrelay init scripts do not support the 'try-restart' and

'reload' arguments. In previous releases, however, using these arguments
did not output any error messages to inform the user that the
restart/reload attempt failed. With this release, using the unsupported
'try-restart' or 'reload' arguments with the dhcpd or dhcrelay init scripts
will correctly display the usage screen and exit the script with a status
code 3. (BZ#491868)

Users of dhcp are advised to apply this update.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 441524 - dhcpd segfaults if interface name is longer than IFNAMSIZ
• BZ - 450301 - dhclient restarts ntpd when not necessary
• BZ - 450545 - retain relay agent options when the client is in INIT or REBIND states
• BZ - 491868 - service dhcpd reload silently fails

CVEs

(none)

References

(none)