Index: hurd-0.6/trans/fakeroot.c
===================================================================
--- hurd-0.6.orig/trans/fakeroot.c
+++ hurd-0.6/trans/fakeroot.c
@@ -91,7 +91,11 @@ new_node (file_t file, mach_port_t idpor
     }
   nn = netfs_node_netnode (*np);
   nn->file = file;
-  nn->openmodes = openmodes;
+
+  /* FIXME: Forbid nn->openmodes == 0 and openmodes == 0? */
+  /* XXX: Limit nn->openmodes */
+  nn->openmodes = openmodes & (O_RDWR | O_EXEC);
+
   if (idport != MACH_PORT_NULL)
     nn->idport = idport;
   else
@@ -207,11 +211,13 @@ check_openmodes (struct netnode *nn, int
 {
   error_t err = 0;
 
-  if (newmodes &~ nn->openmodes)
+  /* XXX: Limit nn->openmodes */
+  nn->openmodes &= (O_RDWR | O_EXEC);
+  if (~nn->openmodes & newmodes)
     {
       /* The user wants openmodes we haven't tried before.  */
 
-      if (file != MACH_PORT_NULL && (nn->openmodes & ~newmodes))
+      if (file != MACH_PORT_NULL && (nn->openmodes & newmodes ))
 	{
 	  /* Intersecting sets.
 	     We need yet another new peropen on this node.  */
@@ -388,7 +394,7 @@ netfs_S_dir_lookup (struct protid *dirus
 	}
 
       err = check_openmodes (netfs_node_netnode (np),
-			     (flags & (O_RDWR|O_EXEC)), file);
+			     flags & (O_RDWR|O_EXEC), file);
       pthread_mutex_unlock (&idport_ihash_lock);
     }
   else