server: Add get_sd and set_sd object operations to allow the security descriptor to be stored somewhere other than server memory, such as on disk.
diff --git a/server/serial.c b/server/serial.c
index 5a1e3ca..239a9c5 100644
--- a/server/serial.c
+++ b/server/serial.c
@@ -94,6 +94,8 @@
     no_signal,                    /* signal */
     serial_get_fd,                /* get_fd */
     default_fd_map_access,        /* map_access */
+    default_get_sd,               /* get_sd */
+    default_set_sd,               /* set_sd */
     no_lookup_name,               /* lookup_name */
     no_open_file,                 /* open_file */
     fd_close_handle,              /* close_handle */