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Fixes illegal memory access errors and arithmetic overflows when running strip on fuzzed binaries. 

PR binutils/17512
	* coffcode.h (coff_compute_section_file_positions): Report
	negative page sizes.
	* elf.c (elf_fake_sections): Handle excessive alignmment powers.
	(assign_file_positions_for_non_load_sections): Replace assertion
	with an error message.
	(rewrite_elf_program_header): Handle excessive segment
	alignments.
	* mach-o.c (bfd_mach_o_read_section_32): Likewise.
	(bfd_mach_o_read_section_64): Likewise.
	* peXXigen.c (_bfd_XX_bfd_copy_private_bfd_data_common): Use %B to
	print a bfd name, not %A.
This commit is contained in:
Nick Clifton 2015-02-26 21:32:04 +00:00
parent 9beb7c4e1d
commit c86934ceee
5 changed files with 67 additions and 6 deletions
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15
bfd/ChangeLog
View File

@ -1,3 +1,18 @@
2015-02-26 Nick Clifton <nickc@redhat.com>
PR binutils/17512
* coffcode.h (coff_compute_section_file_positions): Report
negative page sizes.
* elf.c (elf_fake_sections): Handle excessive alignmment powers.
(assign_file_positions_for_non_load_sections): Replace assertion
with an error message.
(rewrite_elf_program_header): Handle excessive segment
alignments.
* mach-o.c (bfd_mach_o_read_section_32): Likewise.
(bfd_mach_o_read_section_64): Likewise.
* peXXigen.c (_bfd_XX_bfd_copy_private_bfd_data_common): Use %B to
print a bfd name, not %A.
2015-02-26 Alan Modra <amodra@gmail.com>
* elf64-ppc.c (plt_stub_size, build_plt_stub): Don't build

9
bfd/coffcode.h
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@ -3170,6 +3170,15 @@ coff_compute_section_file_positions (bfd * abfd)
This repairs 'ld -r' for arm-wince-pe target. */
if (page_size == 0)
page_size = 1;
/* PR 17512: file: 0ac816d3. */
if (page_size < 0)
{
bfd_set_error (bfd_error_file_too_big);
(*_bfd_error_handler)
(_("%B: page size is too large (0x%x)"), abfd, page_size);
return FALSE;
}
}
else
page_size = PE_DEF_FILE_ALIGNMENT;

32
bfd/elf.c
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@ -2758,6 +2758,15 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)
this_hdr->sh_offset = 0;
this_hdr->sh_size = asect->size;
this_hdr->sh_link = 0;
/* PR 17512: file: 0eb809fe, 8b0535ee. */
if (asect->alignment_power >= (sizeof (bfd_vma) * 8) - 1)
{
(*_bfd_error_handler)
(_("%B: error: Alignment power %d of section `%A' is too big"),
abfd, asect, asect->alignment_power);
arg->failed = TRUE;
return;
}
this_hdr->sh_addralign = (bfd_vma) 1 << asect->alignment_power;
/* The sh_entsize and sh_info fields may have been set already by
copy_private_section_data. */
@ -5211,7 +5220,14 @@ assign_file_positions_for_non_load_sections (bfd *abfd,
&& (p->p_type != PT_NOTE
|| bfd_get_format (abfd) != bfd_core))
{
BFD_ASSERT (!m->includes_filehdr && !m->includes_phdrs);
if (m->includes_filehdr || m->includes_phdrs)
{
/* PR 17512: file: 2195325e. */
(*_bfd_error_handler)
(_("%B: warning: non-load segment includes file header and/or program header"),
abfd);
return FALSE;
}
p->p_filesz = 0;
p->p_offset = m->sections[0]->filepos;
@ -5952,8 +5968,8 @@ rewrite_elf_program_header (bfd *ibfd, bfd *obfd)
something. They are allowed by the ELF spec however, so only
a warning is produced. */
if (segment->p_type == PT_LOAD)
(*_bfd_error_handler) (_("%B: warning: Empty loadable segment"
" detected, is this intentional ?\n"),
(*_bfd_error_handler) (_("\
%B: warning: Empty loadable segment detected, is this intentional ?"),
ibfd);
map->count = 0;
@ -6566,7 +6582,15 @@ rewrite:
i++, segment++)
if (segment->p_type == PT_LOAD
&& maxpagesize < segment->p_align)
maxpagesize = segment->p_align;
{
/* PR 17512: file: f17299af. */
if (segment->p_align > (bfd_vma) 1 << ((sizeof (bfd_vma) * 8) - 2))
(*_bfd_error_handler) (_("\
%B: warning: segment alignment of 0x%llx is too large"),
ibfd, (long long) segment->p_align);
else
maxpagesize = segment->p_align;
}
if (maxpagesize != get_elf_backend_data (obfd)->maxpagesize)
bfd_emul_set_maxpagesize (bfd_get_target (obfd), maxpagesize);

13
bfd/mach-o.c
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@ -3469,6 +3469,13 @@ bfd_mach_o_read_section_32 (bfd *abfd,
section->size = bfd_h_get_32 (abfd, raw.size);
section->offset = bfd_h_get_32 (abfd, raw.offset);
section->align = bfd_h_get_32 (abfd, raw.align);
/* PR 17512: file: 0017eb76. */
if (section->align > 64)
{
(*_bfd_error_handler) (_("bfd_mach_o_read_section_32: overlarge alignment value: 0x%x, using 32 instead"),
section->align);
section->align = 32;
}
section->reloff = bfd_h_get_32 (abfd, raw.reloff);
section->nreloc = bfd_h_get_32 (abfd, raw.nreloc);
section->flags = bfd_h_get_32 (abfd, raw.flags);
@ -3508,6 +3515,12 @@ bfd_mach_o_read_section_64 (bfd *abfd,
section->size = bfd_h_get_64 (abfd, raw.size);
section->offset = bfd_h_get_32 (abfd, raw.offset);
section->align = bfd_h_get_32 (abfd, raw.align);
if (section->align > 64)
{
(*_bfd_error_handler) (_("bfd_mach_o_read_section_64: overlarge alignment value: 0x%x, using 32 instead"),
section->align);
section->align = 32;
}
section->reloff = bfd_h_get_32 (abfd, raw.reloff);
section->nreloc = bfd_h_get_32 (abfd, raw.nreloc);
section->flags = bfd_h_get_32 (abfd, raw.flags);

4
bfd/peXXigen.c
View File

@ -2955,7 +2955,7 @@ _bfd_XX_bfd_copy_private_bfd_data_common (bfd * ibfd, bfd * obfd)
if (ope->pe_opthdr.DataDirectory[PE_DEBUG_DATA].Size + (addr - section->vma)
> bfd_get_section_size (section))
{
_bfd_error_handler (_("%A: Data Directory size (%lx) exceeds space left in section (%lx)"),
_bfd_error_handler (_("%B: Data Directory size (%lx) exceeds space left in section (%lx)"),
obfd, ope->pe_opthdr.DataDirectory[PE_DEBUG_DATA].Size,
bfd_get_section_size (section) - (addr - section->vma));
return FALSE;
@ -2991,7 +2991,7 @@ _bfd_XX_bfd_copy_private_bfd_data_common (bfd * ibfd, bfd * obfd)
}
else if (section)
{
_bfd_error_handler (_("%A: Failed to read debug data section"), obfd);
_bfd_error_handler (_("%B: Failed to read debug data section"), obfd);
return FALSE;
}
}