linux-kernel - [tip: objtool/urgent] objtool: Fix type of reloc::addend

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Message-ID: <165062327903.4207.5493412767018613140.tip-bot2@tip-bot2>
Date:   Fri, 22 Apr 2022 10:27:59 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/urgent] objtool: Fix type of reloc::addend

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     c087c6e7b551b7f208c0b852304f044954cf2bb3
Gitweb:        https://git.kernel.org/tip/c087c6e7b551b7f208c0b852304f044954cf2bb3
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Sun, 17 Apr 2022 17:03:40 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 22 Apr 2022 12:13:55 +02:00

objtool: Fix type of reloc::addend

Elf{32,64}_Rela::r_addend is of type: Elf{32,64}_Sword, that means
that our reloc::addend needs to be long or face tuncation issues when
we do elf_rebuild_reloc_section():

  - 107:  48 b8 00 00 00 00 00 00 00 00   movabs $0x0,%rax        109: R_X86_64_64        level4_kernel_pgt+0x80000067
  + 107:  48 b8 00 00 00 00 00 00 00 00   movabs $0x0,%rax        109: R_X86_64_64        level4_kernel_pgt-0x7fffff99

Fixes: 627fce14809b ("objtool: Add ORC unwind table generation")
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lkml.kernel.org/r/20220419203807.596871927@infradead.org
---
 tools/objtool/check.c               | 8 ++++----
 tools/objtool/elf.c                 | 2 +-
 tools/objtool/include/objtool/elf.h | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 5f10653..3f67854 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -559,12 +559,12 @@ static int add_dead_ends(struct objtool_file *file)
 		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",
+				WARN("can't find unreachable insn at %s+0x%lx",
 				     reloc->sym->sec->name, reloc->addend);
 				return -1;
 			}
 		} else {
-			WARN("can't find unreachable insn at %s+0x%x",
+			WARN("can't find unreachable insn at %s+0x%lx",
 			     reloc->sym->sec->name, reloc->addend);
 			return -1;
 		}
@@ -594,12 +594,12 @@ reachable:
 		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",
+				WARN("can't find reachable insn at %s+0x%lx",
 				     reloc->sym->sec->name, reloc->addend);
 				return -1;
 			}
 		} else {
-			WARN("can't find reachable insn at %s+0x%x",
+			WARN("can't find reachable insn at %s+0x%lx",
 			     reloc->sym->sec->name, reloc->addend);
 			return -1;
 		}
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index d7b99a7..0cfe84a 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -546,7 +546,7 @@ static struct section *elf_create_reloc_section(struct elf *elf,
 						int reltype);
 
 int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
-		  unsigned int type, struct symbol *sym, int addend)
+		  unsigned int type, struct symbol *sym, long addend)
 {
 	struct reloc *reloc;
 
diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h
index 22ba7e2..9b36802 100644
--- a/tools/objtool/include/objtool/elf.h
+++ b/tools/objtool/include/objtool/elf.h
@@ -73,7 +73,7 @@ struct reloc {
 	struct symbol *sym;
 	unsigned long offset;
 	unsigned int type;
-	int addend;
+	long addend;
 	int idx;
 	bool jump_table_start;
 };
@@ -135,7 +135,7 @@ struct elf *elf_open_read(const char *name, int flags);
 struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr);
 
 int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
-		  unsigned int type, struct symbol *sym, int addend);
+		  unsigned int type, struct symbol *sym, long addend);
 int elf_add_reloc_to_insn(struct elf *elf, struct section *sec,
 			  unsigned long offset, unsigned int type,
 			  struct section *insn_sec, unsigned long insn_off);