diff --git a/external/mit/lua/dist/src/lobject.c b/external/mit/lua/dist/src/lobject.c
index dd05f1da872a..6b860dadd1e1 100644
--- a/external/mit/lua/dist/src/lobject.c
+++ b/external/mit/lua/dist/src/lobject.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: lobject.c,v 1.5 2015/10/08 13:21:00 mbalmer Exp $	*/
+/*	$NetBSD: lobject.c,v 1.6 2015/10/11 01:01:45 christos Exp $	*/
 
 /*
 ** Id: lobject.c,v 2.104 2015/04/11 18:30:08 roberto Exp 
@@ -358,9 +358,9 @@ void luaO_tostring (lua_State *L, StkId obj) {
   lua_assert(ttisnumber(obj));
 #ifndef _KERNEL
   if (ttisinteger(obj))
-    len = lua_integer2str(buff, ivalue(obj));
+    len = lua_integer2str(buff, sizeof(buff), ivalue(obj));
   else {
-    len = lua_number2str(buff, fltvalue(obj));
+    len = lua_number2str(buff, sizeof(buff), fltvalue(obj));
 #if !defined(LUA_COMPAT_FLOATSTRING)
     if (buff[strspn(buff, "-0123456789")] == '\0') {  /* looks like an int? */
       buff[len++] = lua_getlocaledecpoint();
@@ -424,7 +424,7 @@ const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
 #endif
       case 'p': {
         char buff[4*sizeof(void *) + 8]; /* should be enough space for a '%p' */
-        int l = sprintf(buff, "%p", va_arg(argp, void *));
+        int l = snprintf(buff, sizeof(buff), "%p", va_arg(argp, void *));
         pushstr(L, buff, l);
         break;
       }
diff --git a/external/mit/lua/dist/src/lstrlib.c b/external/mit/lua/dist/src/lstrlib.c
index 2d105c5a0d6d..927263cd8668 100644
--- a/external/mit/lua/dist/src/lstrlib.c
+++ b/external/mit/lua/dist/src/lstrlib.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: lstrlib.c,v 1.9 2015/10/08 13:40:16 mbalmer Exp $	*/
+/*	$NetBSD: lstrlib.c,v 1.10 2015/10/11 01:01:45 christos Exp $	*/
 
 /*
 ** Id: lstrlib.c,v 1.229 2015/05/20 17:39:23 roberto Exp 
@@ -834,12 +834,12 @@ static lua_Number adddigit (char *buff, int n, lua_Number x) {
 }
 
 
-static int num2straux (char *buff, lua_Number x) {
+static int num2straux (char *buff, size_t len, lua_Number x) {
   if (x != x || x == HUGE_VAL || x == -HUGE_VAL)  /* inf or NaN? */
-    return sprintf(buff, LUA_NUMBER_FMT, x);  /* equal to '%g' */
+    return snprintf(buff, len, LUA_NUMBER_FMT, x);  /* equal to '%g' */
   else if (x == 0) {  /* can be -0... */
-    sprintf(buff, LUA_NUMBER_FMT, x);
-    strcat(buff, "x0p+0");  /* reuses '0/-0' from 'sprintf'... */
+    snprintf(buff, len, LUA_NUMBER_FMT, x);
+    strlcat(buff, "x0p+0", len);  /* reuses '0/-0' from 'snprintf'... */
     return strlen(buff);
   }
   else {
@@ -859,7 +859,8 @@ static int num2straux (char *buff, lua_Number x) {
         m = adddigit(buff, n++, m * 16);
       } while (m > 0);
     }
-    n += sprintf(buff + n, "p%+d", e);  /* add exponent */
+    if (len > (size_t)n)
+	    n += snprintf(buff + n, len - n, "p%+d", e);  /* add exponent */
     return n;
   }
 }
@@ -913,9 +914,9 @@ static void addquoted (lua_State *L, luaL_Buffer *b, int arg) {
     else if (*s == '\0' || iscntrl(uchar(*s))) {
       char buff[10];
       if (!isdigit(uchar(*(s+1))))
-        sprintf(buff, "\\%d", (int)uchar(*s));
+        snprintf(buff, sizeof(buff), "\\%d", (int)uchar(*s));
       else
-        sprintf(buff, "\\%03d", (int)uchar(*s));
+        snprintf(buff, sizeof(buff), "\\%03d", (int)uchar(*s));
       luaL_addstring(b, buff);
     }
     else
@@ -982,25 +983,25 @@ static int str_format (lua_State *L) {
       strfrmt = scanformat(L, strfrmt, form);
       switch (*strfrmt++) {
         case 'c': {
-          nb = sprintf(buff, form, (int)luaL_checkinteger(L, arg));
+          nb = snprintf(buff, MAX_ITEM, form, (int)luaL_checkinteger(L, arg));
           break;
         }
         case 'd': case 'i':
         case 'o': case 'u': case 'x': case 'X': {
           lua_Integer n = luaL_checkinteger(L, arg);
           addlenmod(form, LUA_INTEGER_FRMLEN);
-          nb = sprintf(buff, form, n);
+          nb = snprintf(buff, MAX_ITEM, form, n);
           break;
         }
 #ifndef _KERNEL
         case 'a': case 'A':
           addlenmod(form, LUA_NUMBER_FRMLEN);
-          nb = lua_number2strx(L, buff, form, luaL_checknumber(L, arg));
+          nb = lua_number2strx(L, buff, MAX_ITEM, form, luaL_checknumber(L, arg));
           break;
         case 'e': case 'E': case 'f':
         case 'g': case 'G': {
           addlenmod(form, LUA_NUMBER_FRMLEN);
-          nb = sprintf(buff, form, luaL_checknumber(L, arg));
+          nb = snprintf(buff, MAX_ITEM, form, luaL_checknumber(L, arg));
           break;
         }
 #endif
@@ -1017,7 +1018,7 @@ static int str_format (lua_State *L) {
             luaL_addvalue(&b);
           }
           else {
-            nb = sprintf(buff, form, s);
+            nb = snprintf(buff, MAX_ITEM, form, s);
             lua_pop(L, 1);  /* remove result from 'luaL_tolstring' */
           }
           break;
diff --git a/external/mit/lua/dist/src/luac.c b/external/mit/lua/dist/src/luac.c
index 76b542c3335d..3696b4726a5e 100644
--- a/external/mit/lua/dist/src/luac.c
+++ b/external/mit/lua/dist/src/luac.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: luac.c,v 1.4 2015/10/08 13:21:00 mbalmer Exp $	*/
+/*	$NetBSD: luac.c,v 1.5 2015/10/11 01:01:45 christos Exp $	*/
 
 /*
 ** Id: luac.c,v 1.75 2015/03/12 01:58:27 lhf Exp 
@@ -267,7 +267,7 @@ static void PrintConstant(const Proto* f, int i)
   case LUA_TNUMFLT:
 	{
 	char buff[100];
-	sprintf(buff,LUA_NUMBER_FMT,fltvalue(o));
+	snprintf(buff, sizeof(buff), LUA_NUMBER_FMT,fltvalue(o));
 	printf("%s",buff);
 	if (buff[strspn(buff,"-0123456789")]=='\0') printf(".0");
 	break;
diff --git a/external/mit/lua/dist/src/luaconf.h b/external/mit/lua/dist/src/luaconf.h
index 7e14ad8d5f87..c1be116d9f65 100644
--- a/external/mit/lua/dist/src/luaconf.h
+++ b/external/mit/lua/dist/src/luaconf.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: luaconf.h,v 1.14 2015/10/08 13:21:00 mbalmer Exp $	*/
+/*	$NetBSD: luaconf.h,v 1.15 2015/10/11 01:01:45 christos Exp $	*/
 
 /*
 ** Id: luaconf.h,v 1.251 2015/05/20 17:39:23 roberto Exp 
@@ -478,7 +478,7 @@
 
 #define l_floor(x)		(l_mathop(floor)(x))
 
-#define lua_number2str(s,n)	sprintf((s), LUA_NUMBER_FMT, (n))
+#define lua_number2str(s,l, n)	snprintf((s), (l), LUA_NUMBER_FMT, (n))
 
 
 /*
@@ -515,7 +515,7 @@
 /* The following definitions are good for most cases here */
 
 #define LUA_INTEGER_FMT		"%" LUA_INTEGER_FRMLEN "d"
-#define lua_integer2str(s,n)	sprintf((s), LUA_INTEGER_FMT, (n))
+#define lua_integer2str(s,l,n)	snprintf((s), (l), LUA_INTEGER_FMT, (n))
 
 #define LUAI_UACINT		LUA_INTEGER
 
@@ -599,12 +599,12 @@
 
 /*
 @@ lua_number2strx converts a float to an hexadecimal numeric string. 
-** In C99, 'sprintf' (with format specifiers '%a'/'%A') does that.
+** In C99, 'snprintf' (with format specifiers '%a'/'%A') does that.
 ** Otherwise, you can leave 'lua_number2strx' undefined and Lua will
 ** provide its own implementation.
 */
 #if !defined(LUA_USE_C89)
-#define lua_number2strx(L,b,f,n)	sprintf(b,f,n)
+#define lua_number2strx(L,b,l,f,n)	snprintf(b,l,f,n)
 #endif
 
 
@@ -802,8 +802,6 @@
 #define lua_writestring(s,l)	printf("%s", (s))
 #define lua_writeline()		printf("\n")
 
-#define sprintf(s,fmt,...)	snprintf(s, sizeof(s), fmt, __VA_ARGS__)
-
 /* string.h */
 #define strcoll strcmp