RHBA-2012:0049 - Bug Fix Advisory

Topic

Updated 389-ds-base packages that fix multiple bugs are now available for Red
Hat Enterprise Linux 6.

Description

The 389-ds-base packages provide 389 Directory Server, which is an LDAPv3
compliant server. The base packages include the Lightweight Directory Access
Protocol (LDAP) server and command-line utilities for server administration.

This update fixes the following bugs:

• When the LDAP server was under a heavy load, and the network was congested,

client connections could experience problems. If there was a connection problem
while the server was sending Simple Paged Result (SPR) search results to the
client, the LDAP server called a cleanup routine incorrectly. This led to a
memory leak and the server terminated unexpectedly. With this update, the
underlying code has been modified to ensure that cleanup tasks are run correctly
and memory leaks no longer occur. The LDAP server no longer crashes in this
scenario. (BZ#758682)

• Previously, certain operations with the Change Sequence Number (CSN) were not

very effective in 389 Directory Server. Therefore, performing a large number of
the modrdn operations during Directory Server content replications led to poor
performance, and the ns-slapd daemon consumed up to 100% CPU under these
circumstances. With this update, the underlying code has been modified to use
these CSN operations efficiently so that replications in Directory Server now
work as expected in this scenario. (BZ#758683)

• Previously, allocated memory was not correctly released in the underlying code

for the SASL GSSAPI authentication method, when checking the Simple
Authentication and Security Layer (SASL) identity mappings. This problem could
cause memory leaks when processing SASL bind requests, which eventually caused
the LDAP server to terminate unexpectedly with a segmentation fault. This update
adds function calls that are needed to free allocated memory correctly. Memory
leaks no longer occur and the LDAP server no longer crashes in this scenario.
(BZ#758688)

• Previously, 389 Directory Server used the Netscape Portable Runtime (NSPR)

implementation of the read/write locking mechanism. This implementation allowed
deadlocks to occur if 389 Directory Server was under a heavy load, which caused
the server to become unresponsive. With this update, 389 Directory Server now
uses the POSIX implementation of the locking mechanism, and deadlocks no longer
occur under a heavy load. (BZ#771631)

• Under a heavy load in replicated environments, 389 Directory Server did not

handle the Entry USN index correctly. Consequently, the index could become out
of sync with the main database and search operations on USN entries returned
incorrect results. This update modifies the Entry USN plug-in and 389 Directory
Server now handles the Entry USN index as expected. (BZ#771632)

All users of 389-ds-base 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/kb/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.2 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 Update Support from RHUI 6.2 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.2 i386
• Red Hat Storage 2.0 x86_64
• Red Hat Gluster Storage Server for On-premise 2.0 x86_64
• Red Hat Storage for Public Cloud (via RHUI) 2.0 x86_64
• Red Hat Enterprise Linux Server - AUS 6.2 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386

Fixes

CVEs

(none)

References

(none)