diff -Nru /n/sources/plan9/sys/src/libauth/newns.c /sys/src/libauth/newns.c
--- /n/sources/plan9/sys/src/libauth/newns.c	Thu May 17 00:35:10 2007
+++ /sys/src/libauth/newns.c	Sat Feb 27 00:00:00 2016
@@ -368,7 +368,7 @@
 	char ename[ANAMELEN+6];
 	long s;
 
-	sprint(ename, "#e/%s", name);
+	snprint(ename, sizeof ename, "#e/%s", name);
 	f = create(ename, OWRITE, 0664);
 	if(f < 0)
 		return -1;