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7.63. gdb
Updated gdb packages that fix one security issue and three bugs are now available for Red Hat Enterprise Linux 6.
The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) associated with each description below.
The GNU Debugger (GDB) allows debugging of programs written in C, C++, Java, and other languages by executing them in a controlled fashion and then printing out their data.
Security Fix
- CVE-2011-4355
- GDB tried to auto-load certain files (such as GDB scripts, Python scripts, and a thread debugging library) from the current working directory when debugging programs. This could result in the execution of arbitrary code with the user's privileges when GDB was run in a directory that has untrusted content.
Note
With this update, GDB no longer auto-loads files from the current directory and only trusts certain system directories by default. The list of trusted directories can be viewed and modified using the "show auto-load safe-path" and "set auto-load safe-path" GDB commands. Refer to the GDB manual for further information:
Bug Fixes
- BZ#795424
- When a struct member was at an offset greater than 256 MB, the resulting bit position within the struct overflowed and caused an invalid memory access by GDB. With this update, the code has been modified to ensure that GDB can access such positions.
- BZ#811648
- When a thread list of the core file became corrupted, GDB did not print this list but displayed the "Cannot find new threads: generic error" error message instead. With this update, GDB has been modified and it now prints the thread list of the core file as expected.
- BZ#836966
- GDB did not properly handle debugging of multiple binaries with the same build ID. This update modifies GDB to use symbolic links created for particular binaries so that debugging of binaries that share a build ID now proceeds as expected. Debugging of live programs and core files is now more user-friendly.
All users of gdb are advised to upgrade to these updated packages, which contain backported patches to correct these issues.
Updated gdb packages that fix several bugs are now available for Red Hat Enterprise Linux 6.
The GNU Debugger (GDB) allows debugging of programs written in C, C++, Java, and other languages by executing them in a controlled fashion and then printing out their data.
Bug Fixes
- BZ#952090
- When users tried to execute the "maintenance set python print-stack" command, gdb did not recognize it and issued an error stating the command was undefined. With this update, gdb now correctly recognizes and executes the command.
- BZ#952100
- When debugging a C++ program which declared a local static variable inside a class, gdb was unable to locate the local static variable. This caused problems when debugging some issues that required examining these kinds of variables. With this update, gdb now correctly identifies that the variable exists, and the debugging process functions normally.
- BZ#954300
- Previously, users experienced an internal error in the debugger when using a Thread Local Storage (TLS) modifier in a static variable declared inside a class on a C++ program, and asking gdb to print its value. This caused the debugging session to be compromised. With this update, gdb is now able to correctly deal with a static variable declared as a TLS inside a class and errors no longer occur in the described scenario.
Users of gdb are advised to upgrade to these updated packages, which fix these bugs.
