RHBA-2012:0749 - Bug Fix Advisory

Topic

An updated byacc package that fixes one bug is now
available for Red Hat Enterprise Linux 6.

Description

Berkeley Yacc (byacc) is a public domain look-ahead left-to-right (LALR)
parser generator used by many programs during their build process.

This updated byacc package includes a fix for the following bug:

• Byacc's maximum stack depth was reduced from 10000 to 500 between byacc

releases. If deep enough else-if structures were present in source code
being compiled with byacc, this could lead to out-of-memory conditions,
resulting in YACC Stack Overflow and build failure. This updated release
restores the maximum stack depth to its original value, 10000. Note: the
underlying LR algorithm still imposes a hard limit on the number of
parsable else-if statements. Restoring the maximum stack depth to its
original value means source code with deep else-if structures that
previously compiled against byacc will again do so. (BZ#743343)

All byacc users should upgrade to this updated package, which fixes this bug.

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/knowledge/articles/11258

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
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 743343 - gawk + byacc = YACC Stack Overflow regression

CVEs

(none)

References

(none)