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Cure a number of segfaults caused by /DISCARD/ of dynamic sections.

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This commit is contained in:
Alan Modra 2000-10-07 13:40:33 +00:00
parent 44852b190c
commit fc8c40a057
2 changed files with 44 additions and 21 deletions
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7
bfd/ChangeLog
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@ -1,5 +1,12 @@
2000-10-07 Alan Modra <alan@linuxcare.com.au>
* elflink.h (size_dynamic_sections): Don't create various tags if
.dynstr is excluded from the link. Don't set first dynsym entry
if dynsymcount is zero.
(elf_bfd_final_link): Don't try to swap out dynamic syms if
.dynsym excluded from the link. Don't try to write any dynamic
sections excluded from the link.
* elf.c (swap_out_syms): Handle global section symbols.
2000-10-05 DJ Delorie <dj@redhat.com>

58
bfd/elflink.h
View File

@ -2897,7 +2897,7 @@ NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
{
struct elf_info_failed eif;
struct elf_link_hash_entry *h;
bfd_size_type strsize;
asection *dynstr;
*sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (*sinterpptr != NULL || info->shared);
@ -3026,14 +3026,24 @@ NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
return false;
}
strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
if (! elf_add_dynamic_entry (info, DT_HASH, 0)
|| ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
|| ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
|| ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
|| ! elf_add_dynamic_entry (info, DT_SYMENT,
sizeof (Elf_External_Sym)))
return false;
dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
/* If .dynstr is excluded from the link, we don't want any of
these tags. Strictly, we should be checking each section
individually; This quick check covers for the case where
someone does a /DISCARD/ : { *(*) }. */
if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
{
bfd_size_type strsize;
strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
if (! elf_add_dynamic_entry (info, DT_HASH, 0)
|| ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
|| ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
|| ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
|| ! elf_add_dynamic_entry (info, DT_SYMENT,
sizeof (Elf_External_Sym)))
return false;
}
}
/* The backend must work out the sizes of all the other dynamic
@ -3047,7 +3057,6 @@ NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
size_t dynsymcount;
asection *s;
size_t bucketcount = 0;
Elf_Internal_Sym isym;
size_t hash_entry_size;
/* Set up the version definition section. */
@ -3384,15 +3393,20 @@ NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
if (s->contents == NULL && s->_raw_size != 0)
return false;
/* The first entry in .dynsym is a dummy symbol. */
isym.st_value = 0;
isym.st_size = 0;
isym.st_name = 0;
isym.st_info = 0;
isym.st_other = 0;
isym.st_shndx = 0;
elf_swap_symbol_out (output_bfd, &isym,
(PTR) (Elf_External_Sym *) s->contents);
if (dynsymcount != 0)
{
Elf_Internal_Sym isym;
/* The first entry in .dynsym is a dummy symbol. */
isym.st_value = 0;
isym.st_size = 0;
isym.st_name = 0;
isym.st_info = 0;
isym.st_other = 0;
isym.st_shndx = 0;
elf_swap_symbol_out (output_bfd, &isym,
(PTR) (Elf_External_Sym *) s->contents);
}
/* Compute the size of the hashing table. As a side effect this
computes the hash values for all the names we export. */
@ -4602,7 +4616,8 @@ elf_bfd_final_link (abfd, info)
/* The sh_info field records the index of the first non local symbol. */
symtab_hdr->sh_info = bfd_get_symcount (abfd);
if (dynamic)
if (dynamic
&& finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
{
Elf_Internal_Sym sym;
Elf_External_Sym *dynsym =
@ -4867,7 +4882,8 @@ elf_bfd_final_link (abfd, info)
for (o = dynobj->sections; o != NULL; o = o->next)
{
if ((o->flags & SEC_HAS_CONTENTS) == 0
|| o->_raw_size == 0)
|| o->_raw_size == 0
|| o->output_section == bfd_abs_section_ptr)
continue;
if ((o->flags & SEC_LINKER_CREATED) == 0)
{