disallow XCM execute on statemint (#663)

cumulus/polkadot-parachains/statemint/src/lib.rs

@@ -43,7 +43,7 @@ use codec::{Decode, Encode, MaxEncodedLen};
 use constants::{currency::*, fee::WeightToFee};
 use frame_support::{
 	construct_runtime, match_type, parameter_types,
-	traits::{Everything, InstanceFilter},
+	traits::{Everything, InstanceFilter, Nothing},
 	weights::{
 		constants::{BlockExecutionWeight, ExtrinsicBaseWeight},
 		DispatchClass, IdentityFee, Weight,
@@ -569,7 +569,7 @@ impl pallet_xcm::Config for Runtime {
 	type SendXcmOrigin = EnsureXcmOrigin<Origin, LocalOriginToLocation>;
 	type XcmRouter = XcmRouter;
 	type ExecuteXcmOrigin = EnsureXcmOrigin<Origin, LocalOriginToLocation>;
-	type XcmExecuteFilter = Everything;
+	type XcmExecuteFilter = Nothing;
 	type XcmExecutor = XcmExecutor<XcmConfig>;
 	type XcmTeleportFilter = Everything;
 	type XcmReserveTransferFilter = Everything;