8.51. elfutils

Bug Fixes

BZ#755728, BZ#1059897

This update introduces an eu-stack tool that retrieves the backtrace of a process or a core file. * The elfutils libdwfl() functions have been extended to provide support for associating a process state to a Dwfl object. A state can be attached to a process or a core file using the new dwfl_core_file_attach() and dwfl_linux_proc_attach() functions. When a state is attached to a Dwfl object, a new function, dwfl_getthreads(), can be used to iterate over the running threads. It is possible for each thread to unwind and inspect the frames on the call stack using the new dwfl_getthread_frames() function. * The libraries and utilities provide various improvements to recognize DWARF version 4, DWARF GNU tool chain extensions (typed DWARF stack, call_site, entry_value, DW_AT_high_pc, DW_OP_GNU_parameter_ref, and experimental support for DWZ multifiles), and new functions to handle DWARF location expressions. * The eu-readelf utility now supports the "/SYM64/" special entry to read 64-bit ar archive files used on IBM System z architecture.

BZ#1101440

Prior to this update, the eu-readelf utility was unable to read a corrupted ELF file with a missing string table. As a consequence, eu-readelf terminated unexpectedly with a segmentation fault. With this update, eu-readelf has been fixed to skip the data sections with a non-existent string table and read only valid data. As a result, eu-readelf no longer crashes in this scenario.

BZ#806474

Previously, due to bugs in certain tool chain utilities, the main ELF file and the separate debuginfo file had different header types or flags. As a consequence, the eu-unstrip utility was unable to combine the ELF file and the separate debuginfo file. The same problem occurred when the main ELF file was prelinked after the debug information was separated into a debuginfo file. With this update, eu-unstrip displays a warning message similar to "ELF header identification (e_ident) different" and shows which header field does not match if the stripped and unstripped files cannot be combined. Also, the "--force" option has been added so that the user can ignore the warning and combine such files anyway. Additionally, eu-unstrip prints a warning message if the DWARF data need adjusting for prelinking bias. As a result, eu-unstrip now prints appropriate warning messages and the mismatching main ELF and separate debuginfo files can be recombined into one using the "--force" option.