vsock/test: Add test for an unexpectedly lingering close()

There was an issue with SO_LINGER: instead of blocking until all queued
messages for the socket have been successfully sent (or the linger timeout
has been reached), close() would block until packets were handled by the
peer.

Add a test to alert on close() lingering when it should not.

Signed-off-by: Michal Luczaj <mhal@rbox.co>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://patch.msgid.link/20250522-vsock-linger-v6-5-2ad00b0e447e@rbox.co
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index b3258d6ba21a5f51cf4791514854bb40451399a9..f669baaa0dca3bebc678d00eafa80857d1f0fdd6 100644 (file)
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -1839,6 +1839,53 @@ static void test_stream_linger_server(const struct test_opts *opts)
        close(fd);
 }
 
+/* Half of the default to not risk timing out the control channel */
+#define LINGER_TIMEOUT (TIMEOUT / 2)
+
+static void test_stream_nolinger_client(const struct test_opts *opts)
+{
+       bool waited;
+       time_t ns;
+       int fd;
+
+       fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
+       if (fd < 0) {
+               perror("connect");
+               exit(EXIT_FAILURE);
+       }
+
+       enable_so_linger(fd, LINGER_TIMEOUT);
+       send_byte(fd, 1, 0); /* Left unread to expose incorrect behaviour. */
+       waited = vsock_wait_sent(fd);
+
+       ns = current_nsec();
+       close(fd);
+       ns = current_nsec() - ns;
+
+       if (!waited) {
+               fprintf(stderr, "Test skipped, SIOCOUTQ not supported.\n");
+       } else if (DIV_ROUND_UP(ns, NSEC_PER_SEC) >= LINGER_TIMEOUT) {
+               fprintf(stderr, "Unexpected lingering\n");
+               exit(EXIT_FAILURE);
+       }
+
+       control_writeln("DONE");
+}
+
+static void test_stream_nolinger_server(const struct test_opts *opts)
+{
+       int fd;
+
+       fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
+       if (fd < 0) {
+               perror("accept");
+               exit(EXIT_FAILURE);
+       }
+
+       control_expectln("DONE");
+       close(fd);
+}
+
 static struct test_case test_cases[] = {
        {
                .name = "SOCK_STREAM connection reset",
@@ -1999,6 +2046,11 @@ static struct test_case test_cases[] = {
                .run_client = test_stream_linger_client,
                .run_server = test_stream_linger_server,
        },
+       {
+               .name = "SOCK_STREAM SO_LINGER close() on unread",
+               .run_client = test_stream_nolinger_client,
+               .run_server = test_stream_nolinger_server,
+       },
        {},
 };