[PATCH v7 20/28] selftests/landlock: Add test for invalid ruleset file descriptor

["Mickaël Salaün" <mic@digikod.net>]

To align with fs_test's layout1.inval and layout0.proc_nsfs which test
EBADFD for landlock_add_rule(2), create a new base_test's
restrict_self_fd which test EBADFD for landlock_restrict_self(2).

Cc: Günther Noack <gnoack@google.com>
Cc: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
---

Changes since v5:
- New standalone patch (that can be backported).
---
 tools/testing/selftests/landlock/base_test.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/testing/selftests/landlock/base_test.c b/tools/testing/selftests/landlock/base_test.c
index 7dc431a0e18e..cb13416533d2 100644
--- a/tools/testing/selftests/landlock/base_test.c
+++ b/tools/testing/selftests/landlock/base_test.c
@@ -269,6 +269,17 @@ TEST(restrict_self_checks_ordering)
 	ASSERT_EQ(0, close(ruleset_fd));
 }
 
+TEST(restrict_self_fd)
+{
+	int fd;
+
+	fd = open("/dev/null", O_RDONLY | O_CLOEXEC);
+	ASSERT_LE(0, fd);
+
+	EXPECT_EQ(-1, landlock_restrict_self(fd, 0));
+	EXPECT_EQ(EBADFD, errno);
+}
+
 TEST(ruleset_fd_io)
 {
 	struct landlock_ruleset_attr ruleset_attr = {
-- 
2.49.0