[PATCH v2 25/58] objtool/klp: Add test for objects without .modinfo

From: Puranjay Mohan <puranjay@kernel.org>

The module name recorded in .modinfo ends up in the livepatch's klp_object,
and also decides whether a static branch key counts as belonging to vmlinux
or to a module.  An object without one cannot be diffed.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Song Liu <song@kernel.org>
---
 .../objtool/tests/generic/fixtures/no_modinfo.c  | 11 +++++++++++
 .../tests/generic/test-missing-modinfo.sh        | 16 ++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 tools/objtool/tests/generic/fixtures/no_modinfo.c
 create mode 100755 tools/objtool/tests/generic/test-missing-modinfo.sh

diff --git a/tools/objtool/tests/generic/fixtures/no_modinfo.c b/tools/objtool/tests/generic/fixtures/no_modinfo.c
new file mode 100644
index 000000000000..e46374702b1a
--- /dev/null
+++ b/tools/objtool/tests/generic/fixtures/no_modinfo.c

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Deliberately has no .modinfo section. */
+
+int target(int x)
+{
+#ifdef PATCHED
+	return x + 2;
+#else
+	return x + 1;
+#endif
+}

diff --git a/tools/objtool/tests/generic/test-missing-modinfo.sh b/tools/objtool/tests/generic/test-missing-modinfo.sh
new file mode 100755
index 000000000000..6f242f7eb756
--- /dev/null
+++ b/tools/objtool/tests/generic/test-missing-modinfo.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# The module name in .modinfo ends up in the livepatch's klp_object, so an
+# object without one cannot be diffed.
+
+. "$(dirname "$0")/../lib.sh"
+
+setup
+build_pair no_modinfo.c
+run_diff 255
+
+diff_log | grep -q 'modinfo' ||
+	fail "expected a complaint about .modinfo, got: $(diff_log | tail -1)"
+
+pass "object without .modinfo rejected"

-- 
2.53.0-Meta