X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/9a2dd1eff9ed1e7fdd24ad52da0f03b72c86415b..89bf6f58fd6d1f6341d8d3344dad1f4d6eb4328a:/src/scripting.c

diff --git a/src/scripting.c b/src/scripting.c
index 4c7de33b..8c89c923 100644
--- a/src/scripting.c
+++ b/src/scripting.c
@@ -412,6 +412,13 @@ void luaLoadLibraries(lua_State *lua) {
 #endif
 }
 
+/* Remove a functions that we don't want to expose to the Redis scripting
+ * environment. */
+void luaRemoveUnsupportedFunctions(lua_State *lua) {
+    lua_pushnil(lua);
+    lua_setglobal(lua,"loadfile");
+}
+
 /* This function installs metamethods in the global table _G that prevent
  * the creation of globals accidentally.
  *
@@ -455,7 +462,9 @@ void scriptingEnableGlobalsProtection(lua_State *lua) {
  * See scriptingReset() for more information. */
 void scriptingInit(void) {
     lua_State *lua = lua_open();
+
     luaLoadLibraries(lua);
+    luaRemoveUnsupportedFunctions(lua);
 
     /* Initialize a dictionary we use to map SHAs to scripts.
      * This is useful for replication, as we need to replicate EVALSHA
@@ -707,6 +716,7 @@ void evalGenericCommand(redisClient *c, int evalsha) {
     lua_State *lua = server.lua;
     char funcname[43];
     long long numkeys;
+    int delhook = 0;
 
     /* We want the same PRNG sequence at every call so that our PRNG is
      * not affected by external state. */
@@ -777,19 +787,19 @@ void evalGenericCommand(redisClient *c, int evalsha) {
      * is running for too much time.
      * We set the hook only if the time limit is enabled as the hook will
      * make the Lua script execution slower. */
+    server.lua_caller = c;
+    server.lua_time_start = ustime()/1000;
+    server.lua_kill = 0;
     if (server.lua_time_limit > 0 && server.masterhost == NULL) {
         lua_sethook(lua,luaMaskCountHook,LUA_MASKCOUNT,100000);
-    } else {
-        lua_sethook(lua,luaMaskCountHook,0,0);
+        delhook = 1;
     }
 
     /* At this point whatever this script was never seen before or if it was
      * already defined, we can call it. We have zero arguments and expect
      * a single return value. */
-    server.lua_caller = c;
-    server.lua_time_start = ustime()/1000;
-    server.lua_kill = 0;
     if (lua_pcall(lua,0,1,0)) {
+        if (delhook) lua_sethook(lua,luaMaskCountHook,0,0); /* Disable hook */
         if (server.lua_timedout) {
             server.lua_timedout = 0;
             /* Restore the readable handler that was unregistered when the
@@ -805,6 +815,7 @@ void evalGenericCommand(redisClient *c, int evalsha) {
         lua_gc(lua,LUA_GCCOLLECT,0);
         return;
     }
+    if (delhook) lua_sethook(lua,luaMaskCountHook,0,0); /* Disable hook */
     server.lua_timedout = 0;
     server.lua_caller = NULL;
     selectDb(c,server.lua_client->db->id); /* set DB ID from Lua client */