[PATCH v7 16/18] seltests/landlock: add invalid input data test

[Konstantin Meskhidze <konstantin.meskhidze@huawei.com>]

This patch adds rules with invalid user space supplied data:
    - out of range ruleset attribute;
    - unhandled allowed access;
    - zero port value;
    - zero access value;

Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
---

Changes since v6:
* Adds invalid ruleset attribute test.

Changes since v5:
* Formats code with clang-format-14.

Changes since v4:
* Refactors code with self->port variable.

Changes since v3:
* Adds inval test.

---
 tools/testing/selftests/landlock/net_test.c | 66 ++++++++++++++++++++-
 1 file changed, 65 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
index a93224d1521b..067ba45f58a5 100644
--- a/tools/testing/selftests/landlock/net_test.c
+++ b/tools/testing/selftests/landlock/net_test.c
@@ -26,9 +26,12 @@

 #define IP_ADDRESS "127.0.0.1"

-/* Number pending connections queue to be hold */
+/* Number pending connections queue to be hold. */
 #define BACKLOG 10

+/* Invalid attribute, out of landlock network access range. */
+#define LANDLOCK_INVAL_ATTR 7
+
 FIXTURE(socket)
 {
 	uint port[MAX_SOCKET_NUM];
@@ -719,4 +722,65 @@ TEST_F(socket, ruleset_expanding)
 	/* Closes socket 1. */
 	ASSERT_EQ(0, close(sockfd_1));
 }
+
+TEST_F(socket, inval)
+{
+	struct landlock_ruleset_attr ruleset_attr = {
+		.handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP
+	};
+	struct landlock_ruleset_attr ruleset_attr_inval = {
+		.handled_access_net = LANDLOCK_INVAL_ATTR
+	};
+	struct landlock_net_service_attr net_service_1 = {
+		.allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP |
+				  LANDLOCK_ACCESS_NET_CONNECT_TCP,
+		.port = self->port[0],
+	};
+	struct landlock_net_service_attr net_service_2 = {
+		.allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP,
+		.port = 0,
+	};
+	struct landlock_net_service_attr net_service_3 = {
+		.allowed_access = 0,
+		.port = self->port[1],
+	};
+	struct landlock_net_service_attr net_service_4 = {
+		.allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP,
+		.port = self->port[2],
+	};
+
+	/* Checks invalid ruleset attribute. */
+	const int ruleset_fd_inv = landlock_create_ruleset(
+		&ruleset_attr_inval, sizeof(ruleset_attr_inval), 0);
+	ASSERT_EQ(-1, ruleset_fd_inv);
+	ASSERT_EQ(EINVAL, errno);
+
+	/* Gets ruleset. */
+	const int ruleset_fd =
+		landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
+	ASSERT_LE(0, ruleset_fd);
+
+	/* Checks unhandled allowed_access. */
+	ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
+					&net_service_1, 0));
+	ASSERT_EQ(EINVAL, errno);
+
+	/* Checks zero port value. */
+	ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
+					&net_service_2, 0));
+	ASSERT_EQ(EINVAL, errno);
+
+	/* Checks zero access value. */
+	ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
+					&net_service_3, 0));
+	ASSERT_EQ(ENOMSG, errno);
+
+	/* Adds with legitimate values. */
+	ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
+				       &net_service_4, 0));
+
+	/* Enforces the ruleset. */
+	enforce_ruleset(_metadata, ruleset_fd);
+	ASSERT_EQ(0, close(ruleset_fd));
+}
 TEST_HARNESS_MAIN
--
2.25.1