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- Handle symbol relocations properly due to changes in the toolchains

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which remove section symbols now
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Merge tag 'objtool_urgent_for_v5.15_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull objtool fix from Borislav Petkov:

 - Handle symbol relocations properly due to changes in the toolchains
   which remove section symbols now

* tag 'objtool_urgent_for_v5.15_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  objtool: Teach get_alt_entry() about more relocation types
This commit is contained in:
Linus Torvalds 2021-10-03 10:23:54 -07:00
commit 52c3c17062
1 changed files with 25 additions and 7 deletions
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32
tools/objtool/special.c
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@ -58,6 +58,24 @@ void __weak arch_handle_alternative(unsigned short feature, struct special_alt *
{
}
static bool reloc2sec_off(struct reloc *reloc, struct section **sec, unsigned long *off)
{
switch (reloc->sym->type) {
case STT_FUNC:
*sec = reloc->sym->sec;
*off = reloc->sym->offset + reloc->addend;
return true;
case STT_SECTION:
*sec = reloc->sym->sec;
*off = reloc->addend;
return true;
default:
return false;
}
}
static int get_alt_entry(struct elf *elf, struct special_entry *entry,
struct section *sec, int idx,
struct special_alt *alt)
@ -91,15 +109,12 @@ static int get_alt_entry(struct elf *elf, struct special_entry *entry,
WARN_FUNC("can't find orig reloc", sec, offset + entry->orig);
return -1;
}
if (orig_reloc->sym->type != STT_SECTION) {
WARN_FUNC("don't know how to handle non-section reloc symbol %s",
if (!reloc2sec_off(orig_reloc, &alt->orig_sec, &alt->orig_off)) {
WARN_FUNC("don't know how to handle reloc symbol type: %s",
sec, offset + entry->orig, orig_reloc->sym->name);
return -1;
}
alt->orig_sec = orig_reloc->sym->sec;
alt->orig_off = orig_reloc->addend;
if (!entry->group || alt->new_len) {
new_reloc = find_reloc_by_dest(elf, sec, offset + entry->new);
if (!new_reloc) {
@ -116,8 +131,11 @@ static int get_alt_entry(struct elf *elf, struct special_entry *entry,
if (arch_is_retpoline(new_reloc->sym))
return 1;
alt->new_sec = new_reloc->sym->sec;
alt->new_off = (unsigned int)new_reloc->addend;
if (!reloc2sec_off(new_reloc, &alt->new_sec, &alt->new_off)) {
WARN_FUNC("don't know how to handle reloc symbol type: %s",
sec, offset + entry->new, new_reloc->sym->name);
return -1;
}
/* _ASM_EXTABLE_EX hack */
if (alt->new_off >= 0x7ffffff0)