Apply suggestions from @izqui

Co-Authored-By: Jorge Izquierdo <izqui97@gmail.com>

Author: facuspagnuolo

contracts/apps/AragonApp.sol

@@ -39,7 +39,8 @@ contract AragonApp is AppStorage, Autopetrified, VaultRecoverable, ReentrancyGua
         bytes memory callData = abi.encodeWithSelector(selector, appId(), address(this));
         bool success = address(_kernel).call(callData);
 
-        // perform a check only if kernel supports "shouldDenyCallingApp" method
+        // if the call to `kernel.shouldDenyCallingApp` reverts (using an old Kernel) we consider that
+        // there is no kill switch and the call should be allowed to continue
         if (success) {
             uint256 _outputLength;
             assembly { _outputLength := returndatasize }
@@ -49,8 +50,8 @@ contract AragonApp is AppStorage, Autopetrified, VaultRecoverable, ReentrancyGua
             bool _shouldDenyCall;
             assembly {
                 let ptr := mload(0x40)                  // get next free memory pointer
-                mstore(0x40, add(ptr, returndatasize))  // set next free memory pointer
-                returndatacopy(ptr, 0, returndatasize)  // copy call return value
+                mstore(0x40, add(ptr, 0x20))  // set next free memory pointer
+                returndatacopy(ptr, 0, 0x20)  // copy call return value
                 _shouldDenyCall := mload(ptr)           // read data
             }
             require(!_shouldDenyCall, ERROR_CONTRACT_CALL_NOT_ALLOWED);

contracts/factory/DAOFactory.sol

@@ -122,7 +122,7 @@ contract DAOFactory {
         acl.removePermissionManager(killSwitch, setAllowedInstancesRole);
     }
 
-    function _setupNewDaoPermissions(Kernel _dao, address _root) internal {
+    function _setupEVMScriptRegistry(Kernel _dao, address _root) internal {
         // grant permissions to script registry factory
         _grantCreatePermissionsRole(_dao, scriptsRegistryFactory);
         _createAppManagerRole(_dao, scriptsRegistryFactory);