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

1 files changed, 25 insertions, 7 deletions

diff --git a/tools/objtool/special.c b/tools/objtool/special.c
index bc925cf19e2d..f58ecc50fb10 100644
--- a/tools/objtool/special.c
+++ b/tools/objtool/special.c
@@ -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)