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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/libbfd.h | |
| 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/libbfd.h')
| -rw-r--r-- | bfd/libbfd.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/bfd/libbfd.h b/bfd/libbfd.h index a8851c8..1189e63 100644 --- a/bfd/libbfd.h +++ b/bfd/libbfd.h @@ -702,8 +702,8 @@ extern bfd_reloc_status_type _bfd_relocate_contents (reloc_howto_type *, bfd *, bfd_vma, bfd_byte *) ATTRIBUTE_HIDDEN; /* Clear a given location using a given howto. */ -extern void _bfd_clear_contents - (reloc_howto_type *, bfd *, asection *, bfd_byte *) ATTRIBUTE_HIDDEN; +extern bfd_reloc_status_type _bfd_clear_contents + (reloc_howto_type *, bfd *, asection *, bfd_byte *, bfd_vma) ATTRIBUTE_HIDDEN; /* Link stabs in sections in the first pass. */ |