RHBA-2013:1609 - Bug Fix Advisory

Topic

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

Description

The gcc packages provide compilers for C, C++, Java, Fortran, Objective C, and
Ada 95 GNU, as well as related support libraries.

This update fixes the following bugs:

• Due to the small local buffer for read tokens, GCC (GNU Compiler Collection)

could trigger stack smashing protector when reading digraphs in a program. The
buffer has been enlarged, and thus the digraph tokens can be read without
harming the memory. (BZ#906234)

• Previously, GCC could terminate unexpectedly when compiling C++ code that

contained a structure with the "va_list" member field. The initialization of
such a structure has been fixed, and GCC no longer crashes on such code.
(BZ#921758)

• Prior to this update, the libgcc utility could terminate unexpectedly when

unwinding the stack for a function annotated with "__attribute__((ms_abi))".
This bug has been fixed by ignoring unwind data for unknown column numbers and
libgcc no longer crashes. (BZ#959564)

• Previously, GCC could terminate unexpectedly when processing debug statements.

This bug has been fixed by removing the value bound to the variable in such
debug statements, and GCC no longer crashes in the described scenario.
(BZ#967003)

In addition, this update adds the following enhancement:

• GCC now supports strings with curly braces and vertical bar inside inline

assembler code. That is, '{', '}', and '|' can now be prefixed with the '%'
sign; in that case they are not handled as dialect delimiters, but are passed
directly to the assembler instead. (BZ#908025)

Users of gcc are advised to upgrade to these updated packages, which fix these
bugs and add this enhancement.

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/site/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 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 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 i386
• Red Hat Enterprise Linux Desktop 6 i386
• 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 - 921758 - gcc internal error: "internal compiler error: in build_zero_init_1, at cp/init.c:279"
• BZ - 959564 - ICC uses ms_abi in its internal library without a thunk causing problems for the unwinder in libgcc

CVEs

(none)

References

(none)