tests: test for setns() EINVAL regression

Verify that setns() reports EINVAL when an fd is passed that refers to an
open file but the file is not a file descriptor useable to interact with
namespaces.

Cc: Jan Stancek <[e-mail]>
Cc: Cyril Hrubis <[e-mail]>
Link: https://lore.kernel.org/lkml/20200615085836.GR12456@shao2-debian
Signed-off-by: Christian Brauner <[e-mail]>

tools/testing/selftests/pidfd/pidfd.h

···
 	return syscall(__NR_pidfd_getfd, pidfd, fd, flags);
 }
 
+static inline int sys_memfd_create(const char *name, unsigned int flags)
+{
+	return syscall(__NR_memfd_create, name, flags);
+}
+
 #endif /* __PIDFD_H */

tools/testing/selftests/pidfd/pidfd_getfd_test.c

···
 	return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
 }
 
-static int sys_memfd_create(const char *name, unsigned int flags)
-{
-	return syscall(__NR_memfd_create, name, flags);
-}
-
 static int __child(int sk, int memfd)
 {
 	int ret;

tools/testing/selftests/pidfd/pidfd_setns_test.c

···
 	}
 }
 
+TEST(setns_einval)
+{
+	int fd;
+
+	fd = sys_memfd_create("rostock", 0);
+	EXPECT_GT(fd, 0);
+
+	ASSERT_NE(setns(fd, 0), 0);
+	EXPECT_EQ(errno, EINVAL);
+	close(fd);
+}
+
 TEST_HARNESS_MAIN