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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Borislav Petkov <bp@suse.de>,
        Josh Poimboeuf <jpoimboe@kernel.org>,
        Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Subject: [PATCH 5.18 22/70] objtool: Treat .text.__x86.* as noinstr
Date:   Fri, 22 Jul 2022 11:07:17 +0200
Message-Id: <20220722090651.964758178@linuxfoundation.org>
In-Reply-To: <20220722090650.665513668@linuxfoundation.org>
References: <20220722090650.665513668@linuxfoundation.org>
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From: Peter Zijlstra <peterz@infradead.org>

commit 951ddecf435659553ed15a9214e153a3af43a9a1 upstream.

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@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 tools/objtool/check.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -374,7 +374,8 @@ static int decode_instructions(struct ob
 			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->sh.sh_size; offset += insn->len) {