--- linux-source-2.6.10-2.6.10.orig/arch/x86_64/kernel/setup64.c
+++ linux-source-2.6.10-2.6.10/arch/x86_64/kernel/setup64.c
@@ -52,10 +52,10 @@
 */ 
 static int __init nonx_setup(char *str)
 {
-	if (!strcmp(str, "on")) {
+	if (!memcmp(str, "on", 2)) {
                 __supported_pte_mask |= _PAGE_NX; 
  		do_not_nx = 0; 
-	} else if (!strcmp(str, "off")) {
+	} else if (!memcmp(str, "off", 3)) {
 		do_not_nx = 1;
 		__supported_pte_mask &= ~_PAGE_NX;
         }