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PR 9934

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* elf-bfd.h (NUM_SHDR_ENTRIES): Cope with an empty section.
        * elflink.c (elf_link_read_relocs_from_section): Use
        NUM_SHDR_ENTRIES.  Gracefully handle the case where there are
        relocs but no symbol table.
        * elf32-arm.c (elf32_arm_check_relocs): Likewise.
This commit is contained in:
Nick Clifton 2009-03-13 11:34:43 +00:00
parent f7c60c5e2b
commit ce98a316e9
4 changed files with 41 additions and 10 deletions
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9
bfd/ChangeLog
View file

@ -1,3 +1,12 @@
2009-03-13 Nick Clifton <nickc@redhat.com>
PR 9934
* elf-bfd.h (NUM_SHDR_ENTRIES): Cope with an empty section.
* elflink.c (elf_link_read_relocs_from_section): Use
NUM_SHDR_ENTRIES. Gracefully handle the case where there are
relocs but no symbol table.
* elf32-arm.c (elf32_arm_check_relocs): Likewise.
2009-03-12 H.J. Lu <hongjiu.lu@intel.com>
PR ld/9938

7
bfd/elf-bfd.h
View file

@ -31,8 +31,11 @@
/* The number of entries in a section is its size divided by the size
of a single entry. This is normally only applicable to reloc and
symbol table sections. */
#define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_size / (shdr)->sh_entsize)
symbol table sections.
PR 9934: It is possible to have relocations that do not refer to
symbols, thus it is also possible to have a relocation section in
an object file, but no symbol table. */
#define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_entsize > 0 ? (shdr)->sh_size / (shdr)->sh_entsize : 0)
/* If size isn't specified as 64 or 32, NAME macro should fail. */
#ifndef NAME

14
bfd/elf32-arm.c
View file

@ -9597,6 +9597,7 @@ elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
bfd_vma *local_got_offsets;
struct elf32_arm_link_hash_table *htab;
bfd_boolean needs_plt;
unsigned long nsyms;
if (info->relocatable)
return TRUE;
@ -9620,7 +9621,8 @@ elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
symtab_hdr = & elf_symtab_hdr (abfd);
sym_hashes = elf_sym_hashes (abfd);
nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
rel_end = relocs + sec->reloc_count;
for (rel = relocs; rel < rel_end; rel++)
{
@ -9633,14 +9635,18 @@ elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info,
r_type = ELF32_R_TYPE (rel->r_info);
r_type = arm_real_reloc_type (htab, r_type);
if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
if (r_symndx >= nsyms
/* PR 9934: It is possible to have relocations that do not
refer to symbols, thus it is also possible to have an
object file containing relocations but no symbol table. */
&& (r_symndx > 0 || nsyms > 0))
{
(*_bfd_error_handler) (_("%B: bad symbol index: %d"), abfd,
r_symndx);
r_symndx);
return FALSE;
}
if (r_symndx < symtab_hdr->sh_info)
if (nsyms == 0 || r_symndx < symtab_hdr->sh_info)
h = NULL;
else
{

21
bfd/elflink.c
View file

@ -2202,7 +2202,7 @@ elf_link_read_relocs_from_section (bfd *abfd,
return FALSE;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
nsyms = symtab_hdr->sh_size / symtab_hdr->sh_entsize;
nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
bed = get_elf_backend_data (abfd);
@ -2228,11 +2228,24 @@ elf_link_read_relocs_from_section (bfd *abfd,
r_symndx = ELF32_R_SYM (irela->r_info);
if (bed->s->arch_size == 64)
r_symndx >>= 24;
if ((size_t) r_symndx >= nsyms)
if (nsyms > 0)
{
if ((size_t) r_symndx >= nsyms)
{
(*_bfd_error_handler)
(_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
" for offset 0x%lx in section `%A'"),
abfd, sec,
(unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
}
else if (r_symndx != 0)
{
(*_bfd_error_handler)
(_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
" for offset 0x%lx in section `%A'"),
(_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
" when the object file has no symbol table"),
abfd, sec,
(unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
bfd_set_error (bfd_error_bad_value);