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get_synthetic_symtab fixes for commit 68bbe11833

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Given that relocation symbol name can now be NULL for ELF, adjust
various get_synthetic_symtab routines so they don't segfault.

	* elf.c (_bfd_elf_get_synthetic_symtab): Cope with sym->name
	possibly being NULL.
	* elf32-arm.c (elf32_arm_get_synthetic_symtab): Likewise.
	* elf32-ppc.c (ppc_elf_get_synthetic_symtab): Likewise.
	* elf64-ppc.c (ppc64_elf_get_synthetic_symtab): Likewise.
	* elfxx-mips.c (_bfd_mips_elf_get_synthetic_symtab): Likewise.
	* elfxx-x86.c (_bfd_x86_elf_get_synthetic_symtab): Likewise.
This commit is contained in:
Alan Modra 2024-10-04 13:30:09 +09:30
parent 265757dc6e
commit 0c13ac533e
6 changed files with 154 additions and 128 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
bfd/elf.c
View File

@ -13537,17 +13537,19 @@ _bfd_elf_get_synthetic_symtab (bfd *abfd,
size = count * sizeof (asymbol);
p = relplt->relocation;
for (i = 0; i < count; i++, p += bed->s->int_rels_per_ext_rel)
{
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
{
if ((*p->sym_ptr_ptr)->name != NULL)
{
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
{
#ifdef BFD64
size += sizeof ("+0x") - 1 + 8 + 8 * (bed->s->elfclass == ELFCLASS64);
size += (sizeof ("+0x") - 1 + 8
+ 8 * (bed->s->elfclass == ELFCLASS64));
#else
size += sizeof ("+0x") - 1 + 8;
size += sizeof ("+0x") - 1 + 8;
#endif
}
}
}
}
s = *ret = (asymbol *) bfd_malloc (size);
if (s == NULL)
@ -13565,6 +13567,9 @@ _bfd_elf_get_synthetic_symtab (bfd *abfd,
if (addr == (bfd_vma) -1)
continue;
if ((*p->sym_ptr_ptr)->name == NULL)
continue;
*s = **p->sym_ptr_ptr;
/* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
we are defining a symbol, ensure one of them is set. */

24
bfd/elf32-arm.c
View File

@ -20100,6 +20100,7 @@ elf32_arm_get_synthetic_symtab (bfd *abfd,
char *names;
asection *plt;
bfd_vma offset;
bfd_vma plt_size;
bfd_byte *data;
*ret = NULL;
@ -20134,11 +20135,12 @@ elf32_arm_get_synthetic_symtab (bfd *abfd,
size = count * sizeof (asymbol);
p = relplt->relocation;
for (i = 0; i < count; i++, p += elf32_arm_size_info.int_rels_per_ext_rel)
{
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
size += sizeof ("+0x") - 1 + 8;
}
if ((*p->sym_ptr_ptr)->name != NULL)
{
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
size += sizeof ("+0x") - 1 + 8;
}
offset = elf32_arm_plt0_size (abfd, data, plt->size);
if (offset == (bfd_vma) -1
@ -20149,16 +20151,19 @@ elf32_arm_get_synthetic_symtab (bfd *abfd,
}
names = (char *) (s + count);
p = relplt->relocation;
n = 0;
for (i = 0; i < count; i++, p += elf32_arm_size_info.int_rels_per_ext_rel)
for (i = 0, p = relplt->relocation, n = 0;
i < count;
i++, p += elf32_arm_size_info.int_rels_per_ext_rel, offset += plt_size)
{
size_t len;
bfd_vma plt_size = elf32_arm_plt_size (abfd, data, offset, plt->size);
plt_size = elf32_arm_plt_size (abfd, data, offset, plt->size);
if (plt_size == (bfd_vma) -1)
break;
if ((*p->sym_ptr_ptr)->name == NULL)
continue;
*s = **p->sym_ptr_ptr;
/* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
we are defining a symbol, ensure one of them is set. */
@ -20188,7 +20193,6 @@ elf32_arm_get_synthetic_symtab (bfd *abfd,
memcpy (names, "@plt", sizeof ("@plt"));
names += sizeof ("@plt");
++s, ++n;
offset += plt_size;
}
free (data);

83
bfd/elf32-ppc.c
View File

@ -1806,7 +1806,7 @@ ppc_elf_get_synthetic_symtab (bfd *abfd, long symcount, asymbol **syms,
bfd_vma stub_off;
asymbol *s;
arelent *p;
size_t count, i, stub_delta;
size_t count, n, i, stub_delta;
size_t size;
char *names;
bfd_byte buf[4];
@ -1935,11 +1935,12 @@ ppc_elf_get_synthetic_symtab (bfd *abfd, long symcount, asymbol **syms,
size = count * sizeof (asymbol);
p = relplt->relocation;
for (i = 0; i < count; i++, p++)
{
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
size += sizeof ("+0x") - 1 + 8;
}
if ((*p->sym_ptr_ptr)->name != NULL)
{
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
size += sizeof ("+0x") - 1 + 8;
}
size += sizeof (asymbol) + sizeof ("__glink");
@ -1953,38 +1954,40 @@ ppc_elf_get_synthetic_symtab (bfd *abfd, long symcount, asymbol **syms,
stub_off = glink_vma - glink->vma;
names = (char *) (s + count + 1 + (resolv_vma != 0));
p = relplt->relocation + count - 1;
for (i = 0; i < count; i++)
{
size_t len;
for (n = 0, i = 0; i < count; i++)
if ((*p->sym_ptr_ptr)->name != NULL)
{
size_t len;
stub_off -= stub_delta;
if (strcmp ((*p->sym_ptr_ptr)->name, "__tls_get_addr_opt") == 0)
stub_off -= 32;
*s = **p->sym_ptr_ptr;
/* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
we are defining a symbol, ensure one of them is set. */
if ((s->flags & BSF_LOCAL) == 0)
s->flags |= BSF_GLOBAL;
s->flags |= BSF_SYNTHETIC;
s->section = glink;
s->value = stub_off;
s->name = names;
s->udata.p = NULL;
len = strlen ((*p->sym_ptr_ptr)->name);
memcpy (names, (*p->sym_ptr_ptr)->name, len);
names += len;
if (p->addend != 0)
{
memcpy (names, "+0x", sizeof ("+0x") - 1);
names += sizeof ("+0x") - 1;
bfd_sprintf_vma (abfd, names, p->addend);
names += strlen (names);
}
memcpy (names, "@plt", sizeof ("@plt"));
names += sizeof ("@plt");
++s;
--p;
}
stub_off -= stub_delta;
if (strcmp ((*p->sym_ptr_ptr)->name, "__tls_get_addr_opt") == 0)
stub_off -= 32;
*s = **p->sym_ptr_ptr;
/* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
we are defining a symbol, ensure one of them is set. */
if ((s->flags & BSF_LOCAL) == 0)
s->flags |= BSF_GLOBAL;
s->flags |= BSF_SYNTHETIC;
s->section = glink;
s->value = stub_off;
s->name = names;
s->udata.p = NULL;
len = strlen ((*p->sym_ptr_ptr)->name);
memcpy (names, (*p->sym_ptr_ptr)->name, len);
names += len;
if (p->addend != 0)
{
memcpy (names, "+0x", sizeof ("+0x") - 1);
names += sizeof ("+0x") - 1;
bfd_sprintf_vma (abfd, names, p->addend);
names += strlen (names);
}
memcpy (names, "@plt", sizeof ("@plt"));
names += sizeof ("@plt");
++s;
--p;
++n;
}
/* Add a symbol at the start of the glink branch table. */
memset (s, 0, sizeof *s);
@ -1996,7 +1999,7 @@ ppc_elf_get_synthetic_symtab (bfd *abfd, long symcount, asymbol **syms,
memcpy (names, "__glink", sizeof ("__glink"));
names += sizeof ("__glink");
s++;
count++;
n++;
if (resolv_vma)
{
@ -2010,10 +2013,10 @@ ppc_elf_get_synthetic_symtab (bfd *abfd, long symcount, asymbol **syms,
memcpy (names, "__glink_PLTresolve", sizeof ("__glink_PLTresolve"));
names += sizeof ("__glink_PLTresolve");
s++;
count++;
n++;
}
return count;
return n;
}
/* The following functions are specific to the ELF linker, while

94
bfd/elf64-ppc.c
View File

@ -2402,7 +2402,8 @@ ppc64_elf_get_synthetic_symtab (bfd *abfd,
sym = *r->sym_ptr_ptr;
if (!sym_exists_at (syms, opdsymend, symcount,
sym->section->id, sym->value + r->addend))
sym->section->id, sym->value + r->addend)
&& syms[i]->name != NULL)
{
++count;
size += sizeof (asymbol);
@ -2440,7 +2441,8 @@ ppc64_elf_get_synthetic_symtab (bfd *abfd,
sym = *r->sym_ptr_ptr;
if (!sym_exists_at (syms, opdsymend, symcount,
sym->section->id, sym->value + r->addend))
sym->section->id, sym->value + r->addend)
&& syms[i]->name != NULL)
{
size_t len;
@ -2491,7 +2493,8 @@ ppc64_elf_get_synthetic_symtab (bfd *abfd,
continue;
ent = bfd_get_64 (abfd, contents + syms[i]->value);
if (!sym_exists_at (syms, opdsymend, symcount, -1, ent))
if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)
&& syms[i]->name != NULL)
{
++count;
size += sizeof (asymbol);
@ -2579,11 +2582,12 @@ ppc64_elf_get_synthetic_symtab (bfd *abfd,
p = relplt->relocation;
for (i = 0; i < plt_count; i++, p++)
{
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
size += sizeof ("+0x") - 1 + 16;
}
if ((*p->sym_ptr_ptr)->name != NULL)
{
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
size += sizeof ("+0x") - 1 + 16;
}
}
}
@ -2603,7 +2607,8 @@ ppc64_elf_get_synthetic_symtab (bfd *abfd,
continue;
ent = bfd_get_64 (abfd, contents + syms[i]->value);
if (!sym_exists_at (syms, opdsymend, symcount, -1, ent))
if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)
&& syms[i]->name != NULL)
{
size_t lo, hi;
size_t len;
@ -2691,42 +2696,43 @@ ppc64_elf_get_synthetic_symtab (bfd *abfd,
for pending shared library loads. */
p = relplt->relocation;
for (i = 0; i < plt_count; i++, p++)
{
size_t len;
if ((*p->sym_ptr_ptr)->name != NULL)
{
size_t len;
*s = **p->sym_ptr_ptr;
/* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
we are defining a symbol, ensure one of them is set. */
if ((s->flags & BSF_LOCAL) == 0)
s->flags |= BSF_GLOBAL;
s->flags |= BSF_SYNTHETIC;
s->section = glink;
s->value = glink_vma - glink->vma;
s->name = names;
s->udata.p = NULL;
len = strlen ((*p->sym_ptr_ptr)->name);
memcpy (names, (*p->sym_ptr_ptr)->name, len);
names += len;
if (p->addend != 0)
{
memcpy (names, "+0x", sizeof ("+0x") - 1);
names += sizeof ("+0x") - 1;
bfd_sprintf_vma (abfd, names, p->addend);
names += strlen (names);
}
memcpy (names, "@plt", sizeof ("@plt"));
names += sizeof ("@plt");
s++;
if (abi < 2)
{
glink_vma += 8;
if (i >= 0x8000)
glink_vma += 4;
}
else
glink_vma += 4;
}
count += plt_count;
*s = **p->sym_ptr_ptr;
/* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
we are defining a symbol, ensure one of them is set. */
if ((s->flags & BSF_LOCAL) == 0)
s->flags |= BSF_GLOBAL;
s->flags |= BSF_SYNTHETIC;
s->section = glink;
s->value = glink_vma - glink->vma;
s->name = names;
s->udata.p = NULL;
len = strlen ((*p->sym_ptr_ptr)->name);
memcpy (names, (*p->sym_ptr_ptr)->name, len);
names += len;
if (p->addend != 0)
{
memcpy (names, "+0x", sizeof ("+0x") - 1);
names += sizeof ("+0x") - 1;
bfd_sprintf_vma (abfd, names, p->addend);
names += strlen (names);
}
memcpy (names, "@plt", sizeof ("@plt"));
names += sizeof ("@plt");
s++;
if (abi < 2)
{
glink_vma += 8;
if (i >= 0x8000)
glink_vma += 4;
}
else
glink_vma += 4;
count++;
}
}
}

48
bfd/elfxx-mips.c
View File

@ -16624,7 +16624,8 @@ _bfd_mips_elf_get_synthetic_symtab (bfd *abfd,
size += count * (sizeof (mipssuffix) +
(micromips_p ? sizeof (microsuffix) : sizeof (m16suffix)));
for (pi = 0; pi < counti; pi += bed->s->int_rels_per_ext_rel)
size += 2 * strlen ((*p[pi].sym_ptr_ptr)->name);
if ((*p[pi].sym_ptr_ptr)->name != NULL)
size += 2 * strlen ((*p[pi].sym_ptr_ptr)->name);
/* Add the size of "_PROCEDURE_LINKAGE_TABLE_" too. */
size += sizeof (asymbol) + sizeof (pltname);
@ -16754,31 +16755,34 @@ _bfd_mips_elf_get_synthetic_symtab (bfd *abfd,
if (i < count)
{
size_t namelen;
size_t len;
if ((*p[pi].sym_ptr_ptr)->name != NULL)
{
size_t namelen;
size_t len;
*s = **p[pi].sym_ptr_ptr;
/* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
we are defining a symbol, ensure one of them is set. */
if ((s->flags & BSF_LOCAL) == 0)
s->flags |= BSF_GLOBAL;
s->flags |= BSF_SYNTHETIC;
s->section = plt;
s->value = plt_offset;
s->name = names;
s->udata.i = other;
*s = **p[pi].sym_ptr_ptr;
/* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
we are defining a symbol, ensure one of them is set. */
if ((s->flags & BSF_LOCAL) == 0)
s->flags |= BSF_GLOBAL;
s->flags |= BSF_SYNTHETIC;
s->section = plt;
s->value = plt_offset;
s->name = names;
s->udata.i = other;
len = strlen ((*p[pi].sym_ptr_ptr)->name);
namelen = len + suffixlen;
if (names + namelen > nend)
break;
len = strlen ((*p[pi].sym_ptr_ptr)->name);
namelen = len + suffixlen;
if (names + namelen > nend)
break;
memcpy (names, (*p[pi].sym_ptr_ptr)->name, len);
names += len;
memcpy (names, suffix, suffixlen);
names += suffixlen;
memcpy (names, (*p[pi].sym_ptr_ptr)->name, len);
names += len;
memcpy (names, suffix, suffixlen);
names += suffixlen;
++s, ++n;
++s, ++n;
}
pi = (pi + bed->s->int_rels_per_ext_rel) % counti;
}
}

12
bfd/elfxx-x86.c
View File

@ -3710,9 +3710,12 @@ _bfd_x86_elf_get_synthetic_symtab (bfd *abfd,
for (i = 0; i < dynrelcount; i++)
{
p = dynrelbuf[i];
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd);
if ((*p->sym_ptr_ptr)->name != NULL)
{
size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt");
if (p->addend != 0)
size += sizeof ("+0x") - 1 + 8 + 8 * ABI_64_P (abfd);
}
}
s = *ret = (asymbol *) bfd_zmalloc (size);
@ -3817,7 +3820,8 @@ _bfd_x86_elf_get_synthetic_symtab (bfd *abfd,
/* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
if (got_vma == p->address
&& p->howto != NULL
&& valid_plt_reloc_p (p->howto->type))
&& valid_plt_reloc_p (p->howto->type)
&& (*p->sym_ptr_ptr)->name != NULL)
{
*s = **p->sym_ptr_ptr;
/* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL