linux-kernel - [GIT PULL] objtool fix

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Message-ID: <Y8ARvWVv5gXT88Ee@gmail.com>
Date:   Thu, 12 Jan 2023 14:57:17 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] objtool fix

Linus,

Please pull the latest core/urgent git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-urgent-2023-01-12

   # HEAD: cad90e5381d840cf2296aaac9b3eff71a30b7c5b objtool: Tolerate STT_NOTYPE symbols at end of section

- Fix objtool to be more permissive with hand-written assembly
  that uses non-function symbols in executable sections.

 Thanks,

	Ingo

------------------>
Nicholas Piggin (1):
      objtool: Tolerate STT_NOTYPE symbols at end of section


 tools/objtool/check.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 4350be739f4f..4b7c8b33069e 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -427,6 +427,15 @@ static int decode_instructions(struct objtool_file *file)
 			if (func->type != STT_NOTYPE && func->type != STT_FUNC)
 				continue;
 
+			if (func->offset == sec->sh.sh_size) {
+				/* Heuristic: likely an "end" symbol */
+				if (func->type == STT_NOTYPE)
+					continue;
+				WARN("%s(): STT_FUNC at end of section",
+				     func->name);
+				return -1;
+			}
+
 			if (func->return_thunk || func->alias != func)
 				continue;