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| author | Alan Modra <amodra@gmail.com> | 2018-10-13 22:03:02 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2018-10-13 23:54:33 +1030 |
| commit | 0930cb3021b8078b34cf216e79eb8608d017864f (patch) | |
| tree | c5368b36cb84da2d40b57d14e28432773ef161c9 /bfd/elf64-x86-64.c | |
| parent | 2bf2bf23da5237f465fdbb759657aeb7825a08a3 (diff) | |
| download | gdb-0930cb3021b8078b34cf216e79eb8608d017864f.zip gdb-0930cb3021b8078b34cf216e79eb8608d017864f.tar.gz gdb-0930cb3021b8078b34cf216e79eb8608d017864f.tar.bz2 | |
_bfd_clear_contents bounds checking
This PR shows a fuzzed binary triggering a segfault via a bad
relocation in .debug_line. It turns out that unlike normal
relocations applied to a section, the linker applies those with
symbols from discarded sections via _bfd_clear_contents without
checking that the relocation is within the section bounds. The same
thing now happens when reading debug sections since commit
a4cd947aca23, the PR23425 fix.
PR 23770
PR 23425
* reloc.c (_bfd_clear_contents): Replace "location" param with
"buf" and "off". Bounds check "off". Return status.
* cofflink.c (_bfd_coff_generic_relocate_section): Update
_bfd_clear_contents call.
* elf-bfd.h (RELOC_AGAINST_DISCARDED_SECTION): Likewise.
* elf32-arc.c (elf_arc_relocate_section): Likewise.
* elf32-i386.c (elf_i386_relocate_section): Likewise.
* elf32-metag.c (metag_final_link_relocate): Likewise.
* elf32-nds32.c (nds32_elf_get_relocated_section_contents): Likewise.
* elf32-ppc.c (ppc_elf_relocate_section): Likewise.
* elf32-visium.c (visium_elf_relocate_section): Likewise.
* elf64-ppc.c (ppc64_elf_relocate_section): Likewise.
* elf64-x86-64.c *(elf_x86_64_relocate_section): Likewise.
* libbfd-in.h (_bfd_clear_contents): Update prototype.
* libbfd.h: Regenerate.
Diffstat (limited to 'bfd/elf64-x86-64.c')
| -rw-r--r-- | bfd/elf64-x86-64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c index c3a6c31..4dcab43 100644 --- a/bfd/elf64-x86-64.c +++ b/bfd/elf64-x86-64.c @@ -2490,7 +2490,7 @@ elf_x86_64_relocate_section (bfd *output_bfd, if (sec != NULL && discarded_section (sec)) { _bfd_clear_contents (howto, input_bfd, input_section, - contents + rel->r_offset); + contents, rel->r_offset); wrel->r_offset = rel->r_offset; wrel->r_info = 0; wrel->r_addend = 0; |