RHBA-2009:1634 - Bug Fix Advisory

Topic

Updated glibc packages that resolve several issues are now available.

Description

The glibc packages contain the standard C libraries used by multiple
programs on the system. These packages contains the standard C and the
standard math libraries. Without these two libraries, the Linux system
cannot function properly.

These updated glibc packages provide fixes for the following bugs:

• when a thread calls the setuid() function, the change of credentials

needs to be performed in every thread as per POSIX requirements. This
update corrects the implementation to avoid a race condition which occurred
when a thread terminated or a new thread was created while the credential
change was performed. (BZ#533213)

• the implementation of the seg_timedwait() function, in assembler,

incorrectly decremented the number of waiting threads stored in a block of
memory when an invalid nanosecond value was passed through its second
argument. This error is corrected in this update. (BZ#540475)

All users of glibc are advised to upgrade to these updated packages, which
resolve these issues.

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 for x86_64 - Extended Update Support 5.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.4 ia64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.4 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 IBM z Systems - Extended Update Support 5.4 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.4 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 533213 - race condition with seteuid()
• BZ - 540475 - assembler implementation of sem_timedwait() on x86/x86_64 reveals a bug when invalid nanosecond argument is used

CVEs

(none)

References

(none)