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* elf.c (_bfd_elf_make_section_from_shdr): Ignore return from

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elf_parse_notes.  Use bfd_malloc_and_get_section.
	(elf_parse_notes): Validate note namesz and descsz.
This commit is contained in:
Alan Modra 2008-07-27 03:43:51 +00:00
parent fa8de41e93
commit baea7ef144
2 changed files with 18 additions and 11 deletions
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6
bfd/ChangeLog
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@ -1,3 +1,9 @@
2008-07-27 Alan Modra <amodra@bigpond.net.au>
* elf.c (_bfd_elf_make_section_from_shdr): Ignore return from
elf_parse_notes. Use bfd_malloc_and_get_section.
(elf_parse_notes): Validate note namesz and descsz.
2008-07-26 Michael Eager <eager@eagercon.com>
* elf32-ppc.c (ppc_elf_merge_obj_attributes): Check compatibility

23
bfd/elf.c
View File

@ -935,20 +935,12 @@ _bfd_elf_make_section_from_shdr (bfd *abfd,
PT_NOTEs from the core files are currently not parsed using BFD. */
if (hdr->sh_type == SHT_NOTE)
{
char *contents;
bfd_byte *contents;
contents = bfd_malloc (hdr->sh_size);
if (!contents)
if (!bfd_malloc_and_get_section (abfd, newsect, &contents))
return FALSE;
if (!bfd_get_section_contents (abfd, hdr->bfd_section, contents, 0,
hdr->sh_size)
|| !elf_parse_notes (abfd, contents, hdr->sh_size, -1))
{
free (contents);
return FALSE;
}
elf_parse_notes (abfd, (char *) contents, hdr->sh_size, -1);
free (contents);
}
@ -8536,14 +8528,23 @@ elf_parse_notes (bfd *abfd, char *buf, size_t size, file_ptr offset)
Elf_External_Note *xnp = (Elf_External_Note *) p;
Elf_Internal_Note in;
if (offsetof (Elf_External_Note, name) > buf - p + size)
return FALSE;
in.type = H_GET_32 (abfd, xnp->type);
in.namesz = H_GET_32 (abfd, xnp->namesz);
in.namedata = xnp->name;
if (in.namesz > buf - in.namedata + size)
return FALSE;
in.descsz = H_GET_32 (abfd, xnp->descsz);
in.descdata = in.namedata + BFD_ALIGN (in.namesz, 4);
in.descpos = offset + (in.descdata - buf);
if (in.descsz != 0
&& (in.descdata >= buf + size
|| in.descsz > buf - in.descdata + size))
return FALSE;
switch (bfd_get_format (abfd))
{