linux-kernel - [PATCH 02/21] objtool: Fix error handling for STD/CLD warnings

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Message-Id: <90a81eb41741429562d2fdd5bf1e23c416b1fc6a.1610652862.git.jpoimboe@redhat.com>
Date:   Thu, 14 Jan 2021 13:39:58 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com, Miroslav Benes <mbenes@...e.cz>
Subject: [PATCH 02/21] objtool: Fix error handling for STD/CLD warnings

Actually return an error (and display a backtrace, if requested) for
directional bit warnings.

Fixes: 2f0f9e9ad7b3 ("objtool: Add Direction Flag validation")
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 tools/objtool/check.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index ed26c22c8244..93c3937d1d6a 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2592,15 +2592,19 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
 			break;
 
 		case INSN_STD:
-			if (state.df)
+			if (state.df) {
 				WARN_FUNC("recursive STD", sec, insn->offset);
+				return 1;
+			}
 
 			state.df = true;
 			break;
 
 		case INSN_CLD:
-			if (!state.df && func)
+			if (!state.df && func) {
 				WARN_FUNC("redundant CLD", sec, insn->offset);
+				return 1;
+			}
 
 			state.df = false;
 			break;
-- 
2.29.2