From: Josh Poimboeuf <jpoimboe@kernel.org>
Date: Tue, 8 Apr 2025 07:02:15 +0000 (-0700)
Subject: objtool: Stop UNRET validation on UD2
X-Git-Tag: v6.15-rc2~21^2~3
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9f9cc012c2cbac4833746a0182e06a8eec940d19;p=thirdparty%2Flinux.git

objtool: Stop UNRET validation on UD2

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@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/ce841269e7e28c8b7f32064464a9821034d724ff.1744095216.git.jpoimboe@kernel.org
---

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 2c703b960420a..2dd89b0f4d5eb 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3902,6 +3902,9 @@ static int validate_unret(struct objtool_file *file, struct instruction *insn)
 			break;
 		}
 
+		if (insn->dead_end)
+			return 0;
+
 		if (!next) {
 			WARN_INSN(insn, "teh end!");
 			return 1;