Support shell sessions

Author: bcoles

modules/exploits/linux/local/glibc_origin_expansion_priv_esc.rb

@@ -223,7 +223,9 @@ def exploit
 
     # Launch exploit
     print_status 'Launching exploit...'
-    output = cmd_exec "#{exp_path}&"
+    # The echo at the end of the command is required
+    # else the original session may die
+    output = cmd_exec "#{exp_path}& echo "
     output.each_line { |line| vprint_status line.chomp }
   end
 end