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

Sasha Levin
2025-04-14T13:31:42Z

From: Josh Poimboeuf <jpoimboe@kernel.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@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
Signed-off-by: Sasha Levin <sashal@kernel.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