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[PATCH] bfd robustification (arithmetic overflows on allocation in elf.c and corrupt version section handling)

Nick Clifton nickc@redhat.com
Mon Jul 4 15:08:00 GMT 2005 
Hi Jakub,

> 2005-06-15  Jakub Jelinek  <jakub@redhat.com>
> 
> 	* libbfd-in.h (bfd_malloc2, bfd_realloc2, bfd_zmalloc2, bfd_alloc2,
> 	bfd_zalloc2): New prototypes.
> 	* bfd-in.h (HALF_BFD_SIZE_TYPE): Define.
> 	* libbfd.c (bfd_malloc2, bfd_realloc2, bfd_zmalloc2): New functions.
> 	* opncls.c (bfd_alloc2, bfd_zalloc2): New functions.
> 	* elf.c (bfd_elf_get_elf_syms, setup_group, assign_section_numbers,
> 	elf_map_symbols, map_sections_to_segments,
> 	assign_file_positions_for_segments, copy_private_bfd_data,
> 	swap_out_syms, _bfd_elf_slurp_version_tables): Use bfd_*alloc2
> 	where appropriate.
> 	* bfd-in2.h: Rebuilt.
> 	* libbfd.h: Rebuilt.
> 
> 	* elf.c (_bfd_elf_print_private_bfd_data): Don't crash on bogus
> 	verdef or verneed section.
> 	(_bfd_elf_slurp_version_tables): Handle corrupt verdef and/or
> 	verneed sections gracefully.
> 	* elfxx-sparc.c (_bfd_sparc_elf_info_to_howto_ptr): Don't crash on
> 	bogus relocation values.
> 	* elf64-ppc.c (ppc64_elf_info_to_howto): Likewise.
> 	* elf64-s390.c (elf_s390_info_to_howto): Likewise.
> 	* elf32-s390.c (elf_s390_info_to_howto): Likewise.
> 	* elf64-x86-64.c (elf64_x86_64_info_to_howto): Likewise.
> 	* elfxx-ia64.c (lookup_howto): Likewise.

Approved - please apply.

But ... have you looked at PR binutils/868 ?  It applies particularly to 
the use of the realloc() function, but it might be worth considering in 
the wider context of the changes that you are making.

> +#define HALF_BFD_SIZE_TYPE \
> +  (((bfd_size_type) 1) << (8 * sizeof (bfd_size_type) / 2))

Hmm, does this 8 assume that a byte is an 8-bit quantity ?

Cheers
   Nick
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