[PATCH v11 2/8] selftests/landlock: Add test for handling unknown scope

The test function, "ruleset_with_unknown_scope", is designed to validate
the behaviour of the "landlock_create_ruleset" function when it is
provided with an unsupported or unknown scope mask.

Signed-off-by: Tahera Fahimi <[email protected]>
---
Changes in versions:
v11:
* Change commit subject and apply coding style
---
 .../testing/selftests/landlock/scoped_test.c  | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 tools/testing/selftests/landlock/scoped_test.c

diff --git a/tools/testing/selftests/landlock/scoped_test.c b/tools/testing/selftests/landlock/scoped_test.c
new file mode 100644
index 000000000000..36d7266de9dc
--- /dev/null
+++ b/tools/testing/selftests/landlock/scoped_test.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Landlock tests - Common scope restriction
+ *
+ * Copyright © 2024 Tahera Fahimi <[email protected]>
+ */
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <linux/landlock.h>
+#include <sys/prctl.h>
+
+#include "common.h"
+
+#define ACCESS_LAST LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET
+
+TEST(ruleset_with_unknown_scope)
+{
+	__u64 scoped_mask;
+
+	for (scoped_mask = 1ULL << 63; scoped_mask != ACCESS_LAST;
+	     scoped_mask >>= 1) {
+		struct landlock_ruleset_attr ruleset_attr = {
+			.scoped = scoped_mask,
+		};
+
+		ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr,
+						      sizeof(ruleset_attr), 0));
+		ASSERT_EQ(EINVAL, errno);
+	}
+}
+
+TEST_HARNESS_MAIN
-- 
2.34.1