linux-kernel - [PATCH AUTOSEL 5.15 08/15] objtool: Stop UNRET validation on UD2

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Message-Id: <20250414133126.680846-8-sashal@kernel.org>
Date: Mon, 14 Apr 2025 09:31:18 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Josh Poimboeuf <jpoimboe@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sasha Levin <sashal@...nel.org>,
	peterz@...radead.org
Subject: [PATCH AUTOSEL 5.15 08/15] objtool: Stop UNRET validation on UD2

From: Josh Poimboeuf <jpoimboe@...nel.org>

[ Upstream commit 9f9cc012c2cbac4833746a0182e06a8eec940d19 ]

In preparation for simplifying INSN_SYSCALL, make validate_unret()
terminate control flow on UD2 just like validate_branch() already does.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: https://lore.kernel.org/r/ce841269e7e28c8b7f32064464a9821034d724ff.1744095216.git.jpoimboe@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/objtool/check.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index c2596b1e1fb1e..d2366ec61edc4 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3416,6 +3416,9 @@ static int validate_entry(struct objtool_file *file, struct instruction *insn)
 			break;
 		}
 
+		if (insn->dead_end)
+			return 0;
+
 		if (!next) {
 			WARN_FUNC("teh end!", insn->sec, insn->offset);
 			return -1;
-- 
2.39.5