diff -uNr lua-5.4.3/src/loslib.c lua-5.4.3.mod/src/loslib.c
--- lua-5.4.3/src/loslib.c	2021-03-15 13:32:51.000000000 +0000
+++ lua-5.4.3.mod/src/loslib.c	2021-05-05 12:18:56.029456408 +0000
@@ -114,14 +114,14 @@
 
 #include <unistd.h>
 
-#define LUA_TMPNAMBUFSIZE	32
+#define LUA_TMPNAMBUFSIZE	256
 
 #if !defined(LUA_TMPNAMTEMPLATE)
-#define LUA_TMPNAMTEMPLATE	"/tmp/lua_XXXXXX"
+#define LUA_TMPNAMTEMPLATE	"@TERMUX_PREFIX@/tmp/lua_XXXXXX"
 #endif
 
-#define lua_tmpnam(b,e) { \
-        strcpy(b, LUA_TMPNAMTEMPLATE); \
+#define lua_tmpnam(b,e,s) { \
+        strncpy(b, LUA_TMPNAMTEMPLATE, s);   \
         e = mkstemp(b); \
         if (e != -1) close(e); \
         e = (e == -1); }
@@ -169,7 +169,7 @@
 static int os_tmpname (lua_State *L) {
   char buff[LUA_TMPNAMBUFSIZE];
   int err;
-  lua_tmpnam(buff, err);
+  lua_tmpnam(buff, err, LUA_TMPNAMBUFSIZE - 1);
   if (l_unlikely(err))
     return luaL_error(L, "unable to generate a unique filename");
   lua_pushstring(L, buff);