RHBA-2011:0577 - Bug Fix Advisory

Topic

Updated libcgroup packages that fix several bugs and add an enhancement are now
available for Red Hat Enterprise Linux 6.

Description

The libcgroup packages provide tools and libraries to control and monitor
control groups.

These updated libcgroup packages provide fixes for the following bugs:

• With this update, the cgred and cgconfig services return proper exit codes

when an error occurs. (BZ#620368)

• The cgconfig service was erroneously setting values of configured parameters

in the reverse order as they were written in the /etc/cgconfig.conf file. With
this update, the cgconfig service now correctly sets parameter values in the
same order as they appear in the configuration file. (BZ#622462)

• The cgget command (which prints parameters of given cgroups) did not correctly

display information about resource controllers due to a small buffer size. With
this update, the buffer is no longer limited in size and the cgget command
displays correct information. (BZ#626127)

• The cgcreate command changed the current working directory when creating a

cgroup. The command restored the working directory to the previous location,
however, some directory changes could have been refused (for example, SELinux;
resulting in cryptic security denials). With this update, the cgcreate command
no longer changes the current working directory and therefore no longer incurs
any SELinux denials. (BZ#628895)

• After re-mounting a hierarchy of cgroups, the lssubsys command displayed

incorrect information about the mounted hierarchies. This update fixes the
faulty parsing of mounted hierarchies which are now correctly displayed.
(BZ#635984)

• The cgred service failed to start if the cgconfig service was not running and

returned the following error: "libcgroup initialization failed, 50001". With
this update, a more human-readable error message is returned when the cgred
service is started before the cgconfig service. (BZ#650984)

• The cgclassify command returned exit code 1 even if no errors occurred. With

this update, exit code 0 is returned in the aforementioned case. (BZ#667957)

• The /etc/cgconfig.conf file could not contain parameter values with special

characters such as commas. Therefore, it was not possible to set certain values
for some parameters (for example, cpuset.cpus=0,2). With this update, the
cgconfig.conf parser allows enclosing the parameter values inside double quotes
which allow special characters to be defined inside them (for example,
cpuset.cpus="0,2"). (BZ#679698)

In addition, these updated packages provide the following enhancement:

• The libcgroup package now includes the cgsnapshot tool which is used to write

the current state of control groups to a configuration file. (BZ#649195)

Users are advised to upgrade to these updated libcgroup packages, which resolve
these issues and add this enhancement.

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
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 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 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 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 620368 - More libcgroup services not LSB-compliant
• BZ - 622462 - Not possible to set memory.memsw.limit_in_bytes
• BZ - 628895 - init script searches cwd which can cause SELinux denials
• BZ - 634939 - rpmlint errors and warnings
• BZ - 635984 - lssubsys -am does not show all subsystems after hierarchy remount
• BZ - 649195 - add cgsnapshot tool to libcgroup package
• BZ - 650984 - cgred and cgrulesengd fail to start with error message, Error: libcgroup initialization failed, 50001
• BZ - 667957 - cgclassify returns 1 on success
• BZ - 679698 - bug in libcgroup is preventing cpuset.cpus to be set as anything other than a single CPU, or a single range.

CVEs

(none)

References

(none)