⁠B.4. Changes in elfutils

Red Hat Developer Toolset 3.0 is distributed with elfutils 0.159, which provides a number of bug fixes and feature enhancements over the Red Hat Enterprise Linux system version and the version included in the previous release of Red Hat Developer Toolset. Below is a comprehensive list of new features in this release.

⁠B.4.1. Changes Since Red Hat Developer Toolset 2.1

The following features have been added since the release of elfutils 0.157 in Red Hat Developer Toolset 2.1:
  • The libdwfl library has been improved in a number of ways:
    • The dwfl_core_file_report has a new parameter, executable.
    • The following new functions have been added: dwfl_module_getsymtab_first_global, dwfl_module_getsym_info, and dwfl_module_addrinfo.
    • An unwinder has been added with a Dwfl_Thread_Callbacks type, two opaque types (Dwfl_Thread and Dwfl_Frame), and the following functions: dwfl_attach_state, dwfl_pid, dwfl_thread_dwfl, dwfl_thread_tid, dwfl_frame_thread, dwfl_thread_state_registers, dwfl_thread_state_register_pc, dwfl_getthread_frames, dwfl_getthreads, dwfl_thread_getframes, and dwfl_frame_pc.
  • The eu-addr2line utility has a new option, -x or --symbol-sections, to show the section in which an address was found.
  • A new utility, eu-stack, has been added that uses the new unwinder for processes and cores.
  • A new backend has been added. The unwinder now supports the ARM 64-bit architecture, which allows for manipulation of ELF and DWARF files specific for ARM 64-bit.
  • The CVE-2014-0172 has been fixed. The bug was caused by an integer overflow that led to a heap-based buffer overflow in the libdw library. To fix the problem, an overflow check has been added before calling malloc to uncompress data.

⁠B.4.2. Changes Since Red Hat Enterprise Linux 7.0

The following features have been added since the release of elfutils 0.158 in Red Hat Enterprise Linux 7.0:
  • The eu-stack utility has two new options:
    • A new option, -d or --debugname, has been added for looking up DWARF debugging information names for frame addresses.
    • A new option, -i or --inlines, has been added for showing inlined frames using DWARF debugging information.
  • The libdwelf library has been improved in a number of ways:
    • A new header file, libdwelf.h, has been added for libdw.so low-level DWARF or ELF helper functions.
    • New functions have been added: dwelf_elf_gnu_debuglink, dwelf_dwarf_gnu_debugaltlink, and dwelf_elf_gnu_build_id.
  • The libdw library has been improved in a number of ways:
    • Support for DWZ multifile forms, DW_FORM_GNU_ref_alt and DW_FORM_GNU_strp_alt, is now enabled by default and is no longer experimental.
    • New functions, dwarf_getalt and dwarf_setalt, have been added for getting or setting the alternative debugging file used for the alt FORMs.
    • The dwfl_linux_proc_find_elf callback now finds ELF from process memory for (deleted) files if the Dwfl has a process state attached.
  • In the libdwfl library, the dwfl_build_id_find_debuginfo and dwfl_standard_find_debuginfo functions now try to resolve and set an alternative debugging file.
  • The elfutils backends have been improved in a number of ways:
    • Call Frame Information (CFI) unwinding has been added for the ARM architecture. It relies on the .debug_frame section of ELF files.
    • A mode compatible with the ARM process initial register state has been added to the ARM 64-bit architecture.
    • Native and core-unwinding support for the ARM 64-bit architecture has been added.
  • All separate elfutils-robustify modifications have been included. The elfutils-robustify changes provide functional and stability fixes that are not a part of the official elfutils distribution.
  • The CVE-2014-0172 has been fixed. The bug was caused by an integer overflow that led to a heap-based buffer overflow in the libdw library. To fix the problem, an overflow check has been added before calling malloc to uncompress data.