[PATCH v3 21/23] selftests/landlock: Extend tests for landlock_restrict_self()'s flags

["Mickaël Salaün" <mic@digikod.net>]

Add the restrict_self_flags test suite to check that
LANDLOCK_RESTRICT_SELF_LOGLESS is valid but not the next bit.  Some
checks are similar to restrict_self_checks_ordering's ones.

Cc: Günther Noack <gnoack@google.com>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Link: https://lore.kernel.org/r/20241122143353.59367-22-mic@digikod.net
---

Changes since v2:
- New patch.
---
 tools/testing/selftests/landlock/base_test.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tools/testing/selftests/landlock/base_test.c b/tools/testing/selftests/landlock/base_test.c
index fbd687691b3c..4e0104f1efa0 100644
--- a/tools/testing/selftests/landlock/base_test.c
+++ b/tools/testing/selftests/landlock/base_test.c
@@ -233,6 +233,22 @@ TEST(restrict_self_checks_ordering)
 	ASSERT_EQ(0, close(ruleset_fd));
 }
 
+TEST(restrict_self_flags)
+{
+	ASSERT_EQ(-1, landlock_restrict_self(-1, 0));
+	ASSERT_EQ(EBADF, errno);
+
+	ASSERT_EQ(-1,
+		  landlock_restrict_self(-1, LANDLOCK_RESTRICT_SELF_LOGLESS));
+	ASSERT_EQ(EBADF, errno);
+
+	ASSERT_EQ(-1, landlock_restrict_self(-1, 1U << 1));
+	ASSERT_EQ(EINVAL, errno);
+
+	ASSERT_EQ(-1, landlock_restrict_self(-1, -1));
+	ASSERT_EQ(EINVAL, errno);
+}
+
 TEST(ruleset_fd_io)
 {
 	struct landlock_ruleset_attr ruleset_attr = {
-- 
2.47.0