--- coreutils-5.97/src/su.c.orig	2006-07-31 11:04:10.000000000 -0300
+++ coreutils-5.97/src/su.c	2006-07-31 11:07:02.000000000 -0300
@@ -491,6 +491,12 @@ main (int argc, char **argv)
     }
   if (optind < argc)
     new_user = argv[optind++];
+  else
+    {
+      struct passwd *entry = getpwuid(0);
+      if (entry) 
+        new_user = entry->pw_name;
+    }
 
   pw = getpwnam (new_user);
   if (! (pw && pw->pw_name && pw->pw_name[0] && pw->pw_dir && pw->pw_dir[0]