linux-kernel - [PATCH AUTOSEL 5.10 04/25] objtool: Treat .text._

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Message-Id: <20220720011616.1024753-4-sashal@kernel.org>
Date:   Tue, 19 Jul 2022 21:15:55 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...e.de>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.10 04/25] objtool: Treat .text.__x86.* as noinstr

From: Peter Zijlstra <peterz@...radead.org>

[ Upstream commit 951ddecf435659553ed15a9214e153a3af43a9a1 ]

Needed because zen_untrain_ret() will be called from noinstr code.

Also makes sense since the thunks MUST NOT contain instrumentation nor
be poked with dynamic instrumentation.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/objtool/check.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 8932f41c387f..0149e0bdf0d8 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -274,7 +274,8 @@ static int decode_instructions(struct objtool_file *file)
 			sec->text = true;
 
 		if (!strcmp(sec->name, ".noinstr.text") ||
-		    !strcmp(sec->name, ".entry.text"))
+		    !strcmp(sec->name, ".entry.text") ||
+		    !strncmp(sec->name, ".text.__x86.", 12))
 			sec->noinstr = true;
 
 		for (offset = 0; offset < sec->len; offset += insn->len) {
-- 
2.35.1