RHBA-2015:2007 - Bug Fix Advisory

Topic

Updated zsh packages that fix one bug are now available for Red Hat Enterprise
Linux 6.

Description

The zsh shell is a command interpreter usable as an interactive login shell and
as a shell script command processor. Zsh resembles the ksh shell (the Korn
shell), but includes many enhancements. Zsh supports command-line editing,
built-in spelling correction, programmable command completion, shell functions
(with autoloading), a history mechanism, and more.

This update fixes the following bug:

• Previously, signal handlers were enabled during the execution of the malloc()

function in the implementation of the lexsave() function. If a signal was
received during the execution of malloc() and its handler attempted to allocate
or free memory, the zsh process ended in deadlock and became unresponsive. To
fix this bug, signal handlers are no longer enabled during the execution of
malloc(), but are queued for processing upon the return from malloc() instead,
and therefore the deadlock no longer occurs. (BZ#1273805)

Users of zsh are advised to upgrade to these updated packages, which fix this
bug.

Solution

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

For details on how to apply this update, refer to:

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 for x86_64 - Extended Update Support 6.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.7 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 IBM z Systems - Extended Update Support 6.7 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.7 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 Update Support from RHUI 6.7 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.7 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux EUS Compute Node 6.7 x86_64
• Red Hat Enterprise Linux for SAP Solutions for x86_64 - Extended Update Support 6.7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 1273805 - malloc() signal leak in lexsave()

CVEs

(none)

References

(none)