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

Cc: Günther Noack <[email protected]>
Signed-off-by: Mickaël Salaün <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
---

Changes since v3:
- Use a last_flag variable.

Changes since v2:
- New patch.
---
 tools/testing/selftests/landlock/base_test.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/testing/selftests/landlock/base_test.c 
b/tools/testing/selftests/landlock/base_test.c
index fbd687691b3c..1a1603ff178b 100644
--- a/tools/testing/selftests/landlock/base_test.c
+++ b/tools/testing/selftests/landlock/base_test.c
@@ -233,6 +233,23 @@ TEST(restrict_self_checks_ordering)
        ASSERT_EQ(0, close(ruleset_fd));
 }
 
+TEST(restrict_self_flags)
+{
+       const __u32 last_flag = LANDLOCK_RESTRICT_SELF_QUIET;
+
+       ASSERT_EQ(-1, landlock_restrict_self(-1, 0));
+       ASSERT_EQ(EBADF, errno);
+
+       ASSERT_EQ(-1, landlock_restrict_self(-1, LANDLOCK_RESTRICT_SELF_QUIET));
+       ASSERT_EQ(EBADF, errno);
+
+       ASSERT_EQ(-1, landlock_restrict_self(-1, last_flag << 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 = {
-- 
2.47.1


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