Test checks that listen(2) doesn't wrongfully return -EACCES instead
of -EINVAL when trying to listen for an incorrect socket state.
Signed-off-by: Mikhail Ivanov <ivanov.mikhail1@xxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/landlock/net_test.c | 65 +++++++++++++++++++++
1 file changed, 65 insertions(+)
diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
index b6fe9bde205f..a8385f1373f6 100644
--- a/tools/testing/selftests/landlock/net_test.c
+++ b/tools/testing/selftests/landlock/net_test.c
@@ -1644,6 +1644,71 @@ TEST_F(ipv4_tcp, with_fs)
EXPECT_EQ(-EACCES, bind_variant(bind_fd, &self->srv1));
}
+TEST_F(ipv4_tcp, listen_on_connected)
+{
+ const struct landlock_ruleset_attr ruleset_attr = {
+ .handled_access_net = ACCESS_ALL,
+ };
+ const struct landlock_net_port_attr tcp_not_restricted_p0 = {
+ .allowed_access = ACCESS_ALL,
+ .port = self->srv0.port,
+ };
+ const struct landlock_net_port_attr tcp_denied_listen_p1 = {
+ .allowed_access = ACCESS_ALL & ~LANDLOCK_ACCESS_NET_LISTEN_TCP,
+ .port = self->srv1.port,
+ };
+ int ruleset_fd;
+ int bind_fd, status;
+ pid_t child;
+
+ ruleset_fd =
+ landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
+ ASSERT_LE(0, ruleset_fd);
+
+ /* Allows all actions for the first port. */
+ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT,
+ &tcp_not_restricted_p0, 0));
+
+ /* Deny listen for the second port. */
+ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT,
+ &tcp_denied_listen_p1, 0));
+
+ enforce_ruleset(_metadata, ruleset_fd);
+ EXPECT_EQ(0, close(ruleset_fd));
+
+ /* Init listening socket. */
+ bind_fd = socket_variant(&self->srv0);
+ ASSERT_LE(0, bind_fd);
+ EXPECT_EQ(0, bind_variant(bind_fd, &self->srv0));
+ EXPECT_EQ(0, listen_variant(bind_fd, backlog));
+
+ child = fork();
+ ASSERT_LE(0, child);
+ if (child == 0) {
+ int connect_fd;
+
+ /* Closes listening socket for the child. */
+ EXPECT_EQ(0, close(bind_fd));
+
+ connect_fd = socket_variant(&self->srv1);
+ ASSERT_LE(0, connect_fd);
+ EXPECT_EQ(0, connect_variant(connect_fd, &self->srv0));
+
+ /* Tries to listen on connected socket. */
+ EXPECT_EQ(-EINVAL, listen_variant(connect_fd, backlog));
+
+ EXPECT_EQ(0, close(connect_fd));
+ _exit(_metadata->exit_code);
+ return;
+ }
+
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ EXPECT_EQ(1, WIFEXITED(status));
+ EXPECT_EQ(EXIT_SUCCESS, WEXITSTATUS(status));
+
+ EXPECT_EQ(0, close(bind_fd));
+}
+
FIXTURE(port_specific)
{
struct service_fixture srv0;
--
2.34.1
