--- polkitagenthelper.c.orig	2009-08-12 15:56:47.000000000 +0200
+++ polkitagenthelper.c	2009-10-01 22:40:42.000000000 +0200
@@ -87,6 +87,14 @@
 
   openlog ("polkit-agent-helper-1", LOG_CONS | LOG_PID, LOG_AUTHPRIV);
 
+  /* check that we are setuid root */
+  if (setuid (0) != 0)
+    {
+      syslog (LOG_WARNING, "can't do setuid (0) [uid=%d, euid=%d]", getuid (), geteuid());
+      fprintf (stderr, "polkit-agent-helper-1: failed to set uid to 0\n");
+      goto error;
+    }
+
   /* check for correct invocation */
   if (argc != 3)
     {