https://sourceware.org/bugzilla/show_bug.cgi?id=33633
Bug ID: 33633
Summary: ld --build-id does not use symtab/strtab content
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: i at maskray dot me
Target Milestone: ---
Originally reported at
https://lore.kernel.org/linux-perf-users/CAP-5=fUC88TVwnjTuTgU+s=lqqp0xohntg5hu27csbazrh7...@mail.gmail.com/
$ cat a.s
.text
.global main
.global foo
main:
foo:
ret
$ cat b.s
.text
.global main
.global bar
main:
bar:
ret
$ gcc -Wl,--build-id a.s -o a.out
$ gcc -Wl,--build-id b.s -o b.out
$ readelf -n a.out
...
Build ID: 9dd0371b953db5d72929af5d98552e4ee1043616
...
$ readelf -n b.out
...
Build ID: 9dd0371b953db5d72929af5d98552e4ee1043616
...
write_build_id calls bfd/elfcode.h:elf_checksum_contents, which hashes the ELF
header, program headers, section headers and contents.
However, .symstr .strtab .shstrtab are special ` sec =
bfd_section_from_elf_index (abfd, count);` returns NULL for the three sections,
causing their contents to be unused in the final build ID.
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