Synopsis

gdb bug fix update

Type/Severity

Bug Fix Advisory

Topic

Updated gdb packages that fix several bugs are now available for Red Hat
Enterprise Linux 6.

Description

The GNU Debugger (GDB) allows users to debug programs written in various
programming languages including C, C++, and Fortran.

This update fixes the following bugs:

• When GDB found a thread with PID -1, GDB attempted to attach to that incorrect
  PID and consequently failed with an internal error. With this update, GDB
  detects the incorrect PID -1 earlier and displays a warning message to the user.
  In addition, the debugging session is no longer affected by the scenario
  described above. (BZ#1099929)
  
• GDB used a splay tree to store elements related to address maps. However, when
  iterating through splay trees that were too large, the recursion of the
  splay_tree_foreach_helper() function caused GDB to run out of stack, which
  generated a segmentation fault. The implementation of
  splay_tree_foreach_helper() has been changed to non-recursive, which improves
  the efficiency of iterator() and makes GDB avoid the aforementioned failure.
  (BZ#1117841)
  
• Previously, GDB did not check for a NULL pointer when trying to find the
  charset names from the user environment. This caused GDB to terminate
  unexpectedly, generating a segmentation fault. With this update, GDB correctly
  checks if it is dealing with a NULL file pointer, thus fixing the bug.
  (BZ#1119119)
  
• GDB uses the "(anonymous namespace)" string in the string representation of
  any symbol defined in an anonymous namespace. However, the linespec parser did
  not recognize that this string was a necessary component, symbol lookups failed
  and breakpoints could not set or reset on symbols defined in anonymous
  namespaces. To fix this bug, the anonymous namespace recognition has been
  abstracted to clarify the unique role of this representation requirement.
  Additionally, the linespec parser has been updated to properly deal with the
  required string. As a result, breakpoints on symbols in anonymous namespaces can
  be properly set or reset by GDB. (BZ#1139405)
  
• The "catch syscall" command uses a special type of breakpoint inside GDB,
  which is not maintained by the code that handles normal breakpoints. Previously,
  GDB was not able to properly catch a system call in the parent process after the
  fork() function call. With this update, system call catchpoints are no longer
  removed from a program that forked itself, and GDB is now able to correctly stop
  at a call from the parent process after it has forked. (BZ#1149205)
  
• A defect in the dlopen() library function previously caused recursive calls to
  dlopen() to crash or abort with a library assertion. Recursive calls to dlopen()
  may occur if an implementation of malloc() provided by the user calls dlopen().
  The dlopen implementation is now reentrant, and recursive calls to dlopen() no
  longer crash or abort with an assertion. (BZ#1156192)
  
• Under certain conditions, while attaching to a process, GDB can perform the
  initial low level ptrace attach request, but the kernel previously refused to
  let the debugger finish the attach sequence. Consequently, GDB terminated
  unexpectedly with an internal error. Now, GDB handles the described scenario
  gracefully, reporting back to the user that the attach request failed. As a
  result, the user receives a warning noting that GDB was unable to attach because
  permission was denied. In addition, the debugging session is not affected by
  this behavior. (BZ#1162264)
  
• When a breakpoint was pending and a new object file appeared and this new
  object file contained multiple possible locations for the breakpoint, GDB was
  being too strict on checking this condition, and issued an internal error. The
  check for multiple locations for the same breakpoint has been relaxed, and GDB
  no longer issues an internal error in this scenario. The user now receives a
  warning mentioning that more than one location for the breakpoint has been
  found, but only one location will be used. (BZ#1186476)
  

Users of gdb are advised to upgrade to these updated packages, which fix these
bugs.

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 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

Fixes

• BZ - 1117841 - stack overflow in splay_tree_foreach_helper
• BZ - 1149205 - `catch syscall' doesn't work for parent after `fork' is called
• BZ - 1162264 - gdb/linux-nat.c:1411: internal-error: linux_nat_post_attach_wait: Assertion `pid == new_pid' failed.
• BZ - 1186476 - backport GDB 7.4 fix to RHEL 6.6 GDB

CVEs

(none)

References

(none)

Red Hat Enterprise Linux Server 6

SRPM
gdb-7.2-83.el6.src.rpm	SHA-256: 2f74cd493bc19e76c75d2b21f803d20b29443bf4b890d7195c493fac3ce159dd
x86_64
gdb-7.2-83.el6.x86_64.rpm	SHA-256: 9b387e7b36380e31899c2d51a8265a4181fec15dedb5fe7d81673720566c8b35
gdb-debuginfo-7.2-83.el6.x86_64.rpm	SHA-256: f6177dc299c00e66e77038be74f75fde9be9c7f0d196725c84e96410ae9fdcf7
gdb-gdbserver-7.2-83.el6.x86_64.rpm	SHA-256: 4617153b0850af95e356f7c499259b220d8c5c3abb4836e679c6d71fd0cb3162
i386
gdb-7.2-83.el6.i686.rpm	SHA-256: b4b4bb6f6b0777bfc68ef54bfc659be5ab9731f502d57cc343f99005ea167725
gdb-debuginfo-7.2-83.el6.i686.rpm	SHA-256: 701d08effde6dd50e32ceea2effd081a26bc2002faad30b07ad82260f0bd0317
gdb-gdbserver-7.2-83.el6.i686.rpm	SHA-256: 6f0d0fcef2efd481f7366c732041cfae5388863c70c4a514095b80733a82fc39

Red Hat Enterprise Linux Workstation 6

SRPM
gdb-7.2-83.el6.src.rpm	SHA-256: 2f74cd493bc19e76c75d2b21f803d20b29443bf4b890d7195c493fac3ce159dd
x86_64
gdb-7.2-83.el6.x86_64.rpm	SHA-256: 9b387e7b36380e31899c2d51a8265a4181fec15dedb5fe7d81673720566c8b35
gdb-debuginfo-7.2-83.el6.x86_64.rpm	SHA-256: f6177dc299c00e66e77038be74f75fde9be9c7f0d196725c84e96410ae9fdcf7
gdb-gdbserver-7.2-83.el6.x86_64.rpm	SHA-256: 4617153b0850af95e356f7c499259b220d8c5c3abb4836e679c6d71fd0cb3162
i386
gdb-7.2-83.el6.i686.rpm	SHA-256: b4b4bb6f6b0777bfc68ef54bfc659be5ab9731f502d57cc343f99005ea167725
gdb-debuginfo-7.2-83.el6.i686.rpm	SHA-256: 701d08effde6dd50e32ceea2effd081a26bc2002faad30b07ad82260f0bd0317
gdb-gdbserver-7.2-83.el6.i686.rpm	SHA-256: 6f0d0fcef2efd481f7366c732041cfae5388863c70c4a514095b80733a82fc39

Red Hat Enterprise Linux Desktop 6

SRPM
gdb-7.2-83.el6.src.rpm	SHA-256: 2f74cd493bc19e76c75d2b21f803d20b29443bf4b890d7195c493fac3ce159dd
x86_64
gdb-7.2-83.el6.x86_64.rpm	SHA-256: 9b387e7b36380e31899c2d51a8265a4181fec15dedb5fe7d81673720566c8b35
gdb-debuginfo-7.2-83.el6.x86_64.rpm	SHA-256: f6177dc299c00e66e77038be74f75fde9be9c7f0d196725c84e96410ae9fdcf7
gdb-gdbserver-7.2-83.el6.x86_64.rpm	SHA-256: 4617153b0850af95e356f7c499259b220d8c5c3abb4836e679c6d71fd0cb3162
i386
gdb-7.2-83.el6.i686.rpm	SHA-256: b4b4bb6f6b0777bfc68ef54bfc659be5ab9731f502d57cc343f99005ea167725
gdb-debuginfo-7.2-83.el6.i686.rpm	SHA-256: 701d08effde6dd50e32ceea2effd081a26bc2002faad30b07ad82260f0bd0317
gdb-gdbserver-7.2-83.el6.i686.rpm	SHA-256: 6f0d0fcef2efd481f7366c732041cfae5388863c70c4a514095b80733a82fc39

Red Hat Enterprise Linux for IBM z Systems 6

SRPM
gdb-7.2-83.el6.src.rpm	SHA-256: 2f74cd493bc19e76c75d2b21f803d20b29443bf4b890d7195c493fac3ce159dd
s390x
gdb-7.2-83.el6.s390x.rpm	SHA-256: d63be3173cff50fdcfee65115b6de11546e705a748909ac1e4094af290cb7986
gdb-debuginfo-7.2-83.el6.s390x.rpm	SHA-256: 263070b7e808b101c403c5df18d807db3d362c43eddb001b11277e5d101e3d06
gdb-gdbserver-7.2-83.el6.s390x.rpm	SHA-256: ee3ab439e28f495f39c1f2695551c480ba344da67f571e9a0c5c981fface6029

Red Hat Enterprise Linux for Power, big endian 6

SRPM
gdb-7.2-83.el6.src.rpm	SHA-256: 2f74cd493bc19e76c75d2b21f803d20b29443bf4b890d7195c493fac3ce159dd
ppc64
gdb-7.2-83.el6.ppc64.rpm	SHA-256: fdd850e3eecac124751731c5396a0a488adeeb42bbbc57544800a52ddaffef95
gdb-debuginfo-7.2-83.el6.ppc64.rpm	SHA-256: e057863912d980acefa9ab2273ab022d234843fa151feb607aeb9fc85d9bfba6
gdb-gdbserver-7.2-83.el6.ppc64.rpm	SHA-256: 876920a7501f9a7f02a6b93a4a94183322aa4d23acd4398e1a03013939750c94

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
gdb-7.2-83.el6.src.rpm	SHA-256: 2f74cd493bc19e76c75d2b21f803d20b29443bf4b890d7195c493fac3ce159dd
x86_64
gdb-7.2-83.el6.x86_64.rpm	SHA-256: 9b387e7b36380e31899c2d51a8265a4181fec15dedb5fe7d81673720566c8b35
gdb-debuginfo-7.2-83.el6.x86_64.rpm	SHA-256: f6177dc299c00e66e77038be74f75fde9be9c7f0d196725c84e96410ae9fdcf7
gdb-gdbserver-7.2-83.el6.x86_64.rpm	SHA-256: 4617153b0850af95e356f7c499259b220d8c5c3abb4836e679c6d71fd0cb3162

Red Hat Enterprise Linux Server from RHUI 6

SRPM
gdb-7.2-83.el6.src.rpm	SHA-256: 2f74cd493bc19e76c75d2b21f803d20b29443bf4b890d7195c493fac3ce159dd
x86_64
gdb-7.2-83.el6.x86_64.rpm	SHA-256: 9b387e7b36380e31899c2d51a8265a4181fec15dedb5fe7d81673720566c8b35
gdb-debuginfo-7.2-83.el6.x86_64.rpm	SHA-256: f6177dc299c00e66e77038be74f75fde9be9c7f0d196725c84e96410ae9fdcf7
gdb-gdbserver-7.2-83.el6.x86_64.rpm	SHA-256: 4617153b0850af95e356f7c499259b220d8c5c3abb4836e679c6d71fd0cb3162
i386
gdb-7.2-83.el6.i686.rpm	SHA-256: b4b4bb6f6b0777bfc68ef54bfc659be5ab9731f502d57cc343f99005ea167725
gdb-debuginfo-7.2-83.el6.i686.rpm	SHA-256: 701d08effde6dd50e32ceea2effd081a26bc2002faad30b07ad82260f0bd0317
gdb-gdbserver-7.2-83.el6.i686.rpm	SHA-256: 6f0d0fcef2efd481f7366c732041cfae5388863c70c4a514095b80733a82fc39