Merge tag 'objtool_urgent_for_v5.15_rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull objtool fixes from Borislav Petkov:

 - Remove an extra section.len member in favour of section.sh_size

 - Align .altinstructions section creation with the kernel's by creating
   them with entry size of 0

 - Fix objtool to convert a reloc symbol to a section offset and not to
   not warn about not knowing how

* tag 'objtool_urgent_for_v5.15_rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  objtool: Remove redundant 'len' field from struct section
  objtool: Make .altinstructions section entry size consistent
  objtool: Remove reloc symbol type checks in get_alt_entry()

Author: torvalds

tools/objtool/arch/x86/decode.c

@@ -684,7 +684,7 @@ static int elf_add_alternative(struct elf *elf,
 	sec = find_section_by_name(elf, ".altinstructions");
 	if (!sec) {
 		sec = elf_create_section(elf, ".altinstructions",
-					 SHF_ALLOC, size, 0);
+					 SHF_ALLOC, 0, 0);
 
 		if (!sec) {
 			WARN_ELF("elf_create_section");

tools/objtool/check.c

@@ -292,7 +292,7 @@ static int decode_instructions(struct objtool_file *file)
 		    !strcmp(sec->name, ".entry.text"))
 			sec->noinstr = true;
 
-		for (offset = 0; offset < sec->len; offset += insn->len) {
+		for (offset = 0; offset < sec->sh.sh_size; offset += insn->len) {
 			insn = malloc(sizeof(*insn));
 			if (!insn) {
 				WARN("malloc failed");
@@ -307,7 +307,7 @@ static int decode_instructions(struct objtool_file *file)
 			insn->offset = offset;
 
 			ret = arch_decode_instruction(file->elf, sec, offset,
-						      sec->len - offset,
+						      sec->sh.sh_size - offset,
 						      &insn->len, &insn->type,
 						      &insn->immediate,
 						      &insn->stack_ops);
@@ -349,9 +349,9 @@ static struct instruction *find_last_insn(struct objtool_file *file,
 {
 	struct instruction *insn = NULL;
 	unsigned int offset;
-	unsigned int end = (sec->len > 10) ? sec->len - 10 : 0;
+	unsigned int end = (sec->sh.sh_size > 10) ? sec->sh.sh_size - 10 : 0;
 
-	for (offset = sec->len - 1; offset >= end && !insn; offset--)
+	for (offset = sec->sh.sh_size - 1; offset >= end && !insn; offset--)
 		insn = find_insn(file, sec, offset);
 
 	return insn;
@@ -389,7 +389,7 @@ static int add_dead_ends(struct objtool_file *file)
 		insn = find_insn(file, reloc->sym->sec, reloc->addend);
 		if (insn)
 			insn = list_prev_entry(insn, list);
-		else if (reloc->addend == reloc->sym->sec->len) {
+		else if (reloc->addend == reloc->sym->sec->sh.sh_size) {
 			insn = find_last_insn(file, reloc->sym->sec);
 			if (!insn) {
 				WARN("can't find unreachable insn at %s+0x%x",
@@ -424,7 +424,7 @@ static int add_dead_ends(struct objtool_file *file)
 		insn = find_insn(file, reloc->sym->sec, reloc->addend);
 		if (insn)
 			insn = list_prev_entry(insn, list);
-		else if (reloc->addend == reloc->sym->sec->len) {
+		else if (reloc->addend == reloc->sym->sec->sh.sh_size) {
 			insn = find_last_insn(file, reloc->sym->sec);
 			if (!insn) {
 				WARN("can't find reachable insn at %s+0x%x",
@@ -1561,14 +1561,14 @@ static int read_unwind_hints(struct objtool_file *file)
 		return -1;
 	}
 
-	if (sec->len % sizeof(struct unwind_hint)) {
+	if (sec->sh.sh_size % sizeof(struct unwind_hint)) {
 		WARN("struct unwind_hint size mismatch");
 		return -1;
 	}
 
 	file->hints = true;
 
-	for (i = 0; i < sec->len / sizeof(struct unwind_hint); i++) {
+	for (i = 0; i < sec->sh.sh_size / sizeof(struct unwind_hint); i++) {
 		hint = (struct unwind_hint *)sec->data->d_buf + i;
 
 		reloc = find_reloc_by_dest(file->elf, sec, i * sizeof(*hint));

tools/objtool/elf.c

@@ -286,10 +286,9 @@ static int read_sections(struct elf *elf)
 				return -1;
 			}
 		}
-		sec->len = sec->sh.sh_size;
 
 		if (sec->sh.sh_flags & SHF_EXECINSTR)
-			elf->text_size += sec->len;
+			elf->text_size += sec->sh.sh_size;
 
 		list_add_tail(&sec->list, &elf->sections);
 		elf_hash_add(section, &sec->hash, sec->idx);
@@ -734,8 +733,8 @@ static int elf_add_string(struct elf *elf, struct section *strtab, char *str)
 	data->d_size = strlen(str) + 1;
 	data->d_align = 1;
 
-	len = strtab->len;
-	strtab->len += data->d_size;
+	len = strtab->sh.sh_size;
+	strtab->sh.sh_size += data->d_size;
 	strtab->changed = true;
 
 	return len;
@@ -790,9 +789,9 @@ struct symbol *elf_create_undef_symbol(struct elf *elf, const char *name)
 	data->d_align = 1;
 	data->d_type = ELF_T_SYM;
 
-	sym->idx = symtab->len / sizeof(sym->sym);
+	sym->idx = symtab->sh.sh_size / sizeof(sym->sym);
 
-	symtab->len += data->d_size;
+	symtab->sh.sh_size += data->d_size;
 	symtab->changed = true;
 
 	symtab_shndx = find_section_by_name(elf, ".symtab_shndx");
@@ -814,7 +813,7 @@ struct symbol *elf_create_undef_symbol(struct elf *elf, const char *name)
 		data->d_align = 4;
 		data->d_type = ELF_T_WORD;
 
-		symtab_shndx->len += 4;
+		symtab_shndx->sh.sh_size += 4;
 		symtab_shndx->changed = true;
 	}
 
@@ -855,7 +854,6 @@ struct section *elf_create_section(struct elf *elf, const char *name,
 	}
 
 	sec->idx = elf_ndxscn(s);
-	sec->len = size;
 	sec->changed = true;
 
 	sec->data = elf_newdata(s);

tools/objtool/include/objtool/elf.h

@@ -38,7 +38,6 @@ struct section {
 	Elf_Data *data;
 	char *name;
 	int idx;
-	unsigned int len;
 	bool changed, text, rodata, noinstr;
 };
 

tools/objtool/orc_gen.c

@@ -204,7 +204,7 @@ int orc_create(struct objtool_file *file)
 
 		/* Add a section terminator */
 		if (!empty) {
-			orc_list_add(&orc_list, &null, sec, sec->len);
+			orc_list_add(&orc_list, &null, sec, sec->sh.sh_size);
 			nr++;
 		}
 	}

tools/objtool/special.c

@@ -58,22 +58,11 @@ void __weak arch_handle_alternative(unsigned short feature, struct special_alt *
 {
 }
 
-static bool reloc2sec_off(struct reloc *reloc, struct section **sec, unsigned long *off)
+static void reloc_to_sec_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;
-	}
+	*sec = reloc->sym->sec;
+	*off = reloc->sym->offset + reloc->addend;
 }
 
 static int get_alt_entry(struct elf *elf, struct special_entry *entry,
@@ -109,13 +98,8 @@ 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 (!reloc2sec_off(orig_reloc, &alt->orig_sec, &alt->orig_off)) {
-		WARN_FUNC("don't know how to handle reloc symbol type %d: %s",
-			   sec, offset + entry->orig,
-			   orig_reloc->sym->type,
-			   orig_reloc->sym->name);
-		return -1;
-	}
+
+	reloc_to_sec_off(orig_reloc, &alt->orig_sec, &alt->orig_off);
 
 	if (!entry->group || alt->new_len) {
 		new_reloc = find_reloc_by_dest(elf, sec, offset + entry->new);
@@ -133,13 +117,7 @@ static int get_alt_entry(struct elf *elf, struct special_entry *entry,
 		if (arch_is_retpoline(new_reloc->sym))
 			return 1;
 
-		if (!reloc2sec_off(new_reloc, &alt->new_sec, &alt->new_off)) {
-			WARN_FUNC("don't know how to handle reloc symbol type %d: %s",
-				  sec, offset + entry->new,
-				  new_reloc->sym->type,
-				  new_reloc->sym->name);
-			return -1;
-		}
+		reloc_to_sec_off(new_reloc, &alt->new_sec, &alt->new_off);
 
 		/* _ASM_EXTABLE_EX hack */
 		if (alt->new_off >= 0x7ffffff0)
@@ -181,13 +159,13 @@ int special_get_alts(struct elf *elf, struct list_head *alts)
 		if (!sec)
 			continue;
 
-		if (sec->len % entry->size != 0) {
+		if (sec->sh.sh_size % entry->size != 0) {
 			WARN("%s size not a multiple of %d",
 			     sec->name, entry->size);
 			return -1;
 		}
 
-		nr_entries = sec->len / entry->size;
+		nr_entries = sec->sh.sh_size / entry->size;
 
 		for (idx = 0; idx < nr_entries; idx++) {
 			alt = malloc(sizeof(*alt));