[RFC PATCH v1 7/9] selftests/landlock: Test listen on ULP socket without clone method

[Mikhail Ivanov]

Test checks that listen(2) doesn't wrongfully return -EACCES instead of
-EINVAL when trying to listen on a socket which is set to ULP that doesn't
have clone method in inet_csk(sk)->icsk_ulp_ops (espintcp).

Signed-off-by: Mikhail Ivanov <ivanov.mikhail1 at huawei-partners.com>
---
 tools/testing/selftests/landlock/config     |  1 +
 tools/testing/selftests/landlock/net_test.c | 38 +++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/tools/testing/selftests/landlock/config b/tools/testing/selftests/landlock/config
index 0086efaa7b68..014401fe6114 100644
--- a/tools/testing/selftests/landlock/config
+++ b/tools/testing/selftests/landlock/config
@@ -12,3 +12,4 @@ CONFIG_SHMEM=y
 CONFIG_SYSFS=y
 CONFIG_TMPFS=y
 CONFIG_TMPFS_XATTR=y
+CONFIG_INET_ESPINTCP=y
\ No newline at end of file
diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
index 1a4c4d1cabc2..caf5f38996ed 100644
--- a/tools/testing/selftests/landlock/net_test.c
+++ b/tools/testing/selftests/landlock/net_test.c
@@ -12,6 +12,7 @@
 #include <fcntl.h>
 #include <linux/landlock.h>
 #include <linux/in.h>
+#include <linux/tcp.h>
 #include <sched.h>
 #include <stdint.h>
 #include <string.h>
@@ -1709,6 +1710,43 @@ TEST_F(ipv4_tcp, listen_on_connected)
 	EXPECT_EQ(0, close(bind_fd));
 }
 
+TEST_F(ipv4_tcp, espintcp_listen)
+{
+	const struct landlock_ruleset_attr ruleset_attr = {
+		.handled_access_net = ACCESS_ALL,
+	};
+	const struct landlock_net_port_attr tcp_denied_listen_p0 = {
+		.allowed_access = ACCESS_ALL & ~LANDLOCK_ACCESS_NET_LISTEN_TCP,
+		.port = self->srv0.port,
+	};
+	int ruleset_fd;
+	int listen_fd;
+
+	ruleset_fd =
+		landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
+	ASSERT_LE(0, ruleset_fd);
+
+	/* Deny listen. */
+	ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT,
+				       &tcp_denied_listen_p0, 0));
+
+	enforce_ruleset(_metadata, ruleset_fd);
+	EXPECT_EQ(0, close(ruleset_fd));
+
+	listen_fd = socket_variant(&self->srv0);
+	ASSERT_LE(0, listen_fd);
+
+	/* Set espintcp ULP. */
+	EXPECT_EQ(0, setsockopt(listen_fd, IPPROTO_TCP, TCP_ULP, "espintcp",
+				sizeof("espintcp")));
+
+	EXPECT_EQ(0, bind_variant(listen_fd, &self->srv0));
+
+	/* Espintcp ULP doesn't have clone method, so listen is denied. */
+	EXPECT_EQ(-EINVAL, listen_variant(listen_fd, backlog));
+	EXPECT_EQ(0, close(listen_fd));
+}
+
 FIXTURE(port_specific)
 {
 	struct service_fixture srv0;
-- 
2.34.1