Update description

modules/exploits/linux/misc/drb_remote_codeexec.rb

@@ -13,7 +13,10 @@ class MetasploitModule < Msf::Exploit::Remote
     super(update_info(info,
       'Name'           => 'Distributed Ruby Send instance_eval/syscall Code Execution',
       'Description'    => %q{
-        This module exploits remote code execution vulnerabilities in dRuby
+        This module exploits remote code execution vulnerabilities in dRuby.
+
+        If the dRuby application sets $SAFE = 1, the instance_eval target will fail.
+        In this event, the syscall target is preferred. This can be set with target 1.
       },
       'Author'         => [ 'joernchen <joernchen[at]phenoelit.de>' ], #(Phenoelit)
       'License'        => MSF_LICENSE,