Limit number of iterations in genesis nonce building (#753)

frame/ethereum/src/lib.rs

@@ -814,7 +814,7 @@ impl<T: Config> Pallet<T> {
 					target,
 					input,
 					value,
-					gas_limit.low_u64(),
+					gas_limit.unique_saturated_into(),
 					max_fee_per_gas,
 					max_priority_fee_per_gas,
 					nonce,
@@ -841,7 +841,7 @@ impl<T: Config> Pallet<T> {
 					from,
 					input,
 					value,
-					gas_limit.low_u64(),
+					gas_limit.unique_saturated_into(),
 					max_fee_per_gas,
 					max_priority_fee_per_gas,
 					nonce,

frame/evm/src/lib.rs

@@ -77,7 +77,7 @@ use sp_runtime::{
 	traits::{BadOrigin, Saturating, UniqueSaturatedInto, Zero},
 	AccountId32, DispatchErrorWithPostInfo,
 };
-use sp_std::vec::Vec;
+use sp_std::{cmp::min, vec::Vec};
 
 pub use evm::{
 	Config as EvmConfig, Context, ExitError, ExitFatal, ExitReason, ExitRevert, ExitSucceed,
@@ -410,21 +410,26 @@ pub mod pallet {
 	}
 
 	#[pallet::genesis_build]
-	impl<T: Config> GenesisBuild<T> for GenesisConfig {
+	impl<T: Config> GenesisBuild<T> for GenesisConfig
+	where
+		U256: UniqueSaturatedInto<BalanceOf<T>>,
+	{
 		fn build(&self) {
+			const MAX_ACCOUNT_NONCE: usize = 100;
+
 			for (address, account) in &self.accounts {
 				let account_id = T::AddressMapping::into_account_id(*address);
 
 				// ASSUME: in one single EVM transaction, the nonce will not increase more than
 				// `u128::max_value()`.
-				for _ in 0..account.nonce.low_u128() {
+				for _ in 0..min(
+					MAX_ACCOUNT_NONCE,
+					UniqueSaturatedInto::<usize>::unique_saturated_into(account.nonce),
+				) {
 					frame_system::Pallet::<T>::inc_account_nonce(&account_id);
 				}
 
-				T::Currency::deposit_creating(
-					&account_id,
-					account.balance.low_u128().unique_saturated_into(),
-				);
+				T::Currency::deposit_creating(&account_id, account.balance.unique_saturated_into());
 
 				Pallet::<T>::create_account(*address, account.code.clone());
 
@@ -707,6 +712,7 @@ where
 		Opposite = C::PositiveImbalance,
 	>,
 	OU: OnUnbalanced<NegativeImbalanceOf<C, T>>,
+	U256: UniqueSaturatedInto<<C as Currency<<T as frame_system::Config>::AccountId>>::Balance>,
 {
 	// Kept type as Option to satisfy bound of Default
 	type LiquidityInfo = Option<NegativeImbalanceOf<C, T>>;
@@ -718,7 +724,7 @@ where
 		let account_id = T::AddressMapping::into_account_id(*who);
 		let imbalance = C::withdraw(
 			&account_id,
-			fee.low_u128().unique_saturated_into(),
+			fee.unique_saturated_into(),
 			WithdrawReasons::FEE,
 			ExistenceRequirement::AllowDeath,
 		)
@@ -738,7 +744,7 @@ where
 			// Calculate how much refund we should return
 			let refund_amount = paid
 				.peek()
-				.saturating_sub(corrected_fee.low_u128().unique_saturated_into());
+				.saturating_sub(corrected_fee.unique_saturated_into());
 			// refund to the account that paid the fees. If this fails, the
 			// account might have dropped below the existential balance. In
 			// that case we don't refund anything.
@@ -769,7 +775,7 @@ where
 				.same()
 				.unwrap_or_else(|_| C::NegativeImbalance::zero());
 
-			let (base_fee, tip) = adjusted_paid.split(base_fee.low_u128().unique_saturated_into());
+			let (base_fee, tip) = adjusted_paid.split(base_fee.unique_saturated_into());
 			// Handle base fee. Can be either burned, rationed, etc ...
 			OU::on_unbalanced(base_fee);
 			return Some(tip);
@@ -793,7 +799,10 @@ impl<T> OnChargeEVMTransaction<T> for ()
 	<T::Currency as Currency<<T as frame_system::Config>::AccountId>>::PositiveImbalance:
 		Imbalance<<T::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance, Opposite = <T::Currency as Currency<<T as frame_system::Config>::AccountId>>::NegativeImbalance>,
 	<T::Currency as Currency<<T as frame_system::Config>::AccountId>>::NegativeImbalance:
-		Imbalance<<T::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance, Opposite = <T::Currency as Currency<<T as frame_system::Config>::AccountId>>::PositiveImbalance>, {
+Imbalance<<T::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance, Opposite = <T::Currency as Currency<<T as frame_system::Config>::AccountId>>::PositiveImbalance>,
+U256: UniqueSaturatedInto<BalanceOf<T>>,
+
+{
 	// Kept type as Option to satisfy bound of Default
 	type LiquidityInfo = Option<NegativeImbalanceOf<T::Currency, T>>;
 

frame/evm/src/runner/stack.rs

@@ -18,8 +18,9 @@
 //! EVM stack-based runner.
 
 use crate::{
-	runner::Runner as RunnerT, AccountCodes, AccountStorages, AddressMapping, BlockHashMapping,
-	Config, Error, Event, FeeCalculator, OnChargeEVMTransaction, Pallet, RunnerError,
+	runner::Runner as RunnerT, AccountCodes, AccountStorages, AddressMapping, BalanceOf,
+	BlockHashMapping, Config, Error, Event, FeeCalculator, OnChargeEVMTransaction, Pallet,
+	RunnerError,
 };
 use evm::{
 	backend::Backend as BackendT,
@@ -41,8 +42,11 @@ pub struct Runner<T: Config> {
 	_marker: PhantomData<T>,
 }
 
-impl<T: Config> Runner<T> {
-	/// Execute an EVM operation.
+impl<T: Config> Runner<T>
+where
+	BalanceOf<T>: TryFrom<U256> + Into<U256>,
+{
+	/// Execute an already validated EVM operation.
 	pub fn execute<'config, 'precompiles, F, R>(
 		source: H160,
 		value: U256,
@@ -245,7 +249,10 @@ impl<T: Config> Runner<T> {
 	}
 }
 
-impl<T: Config> RunnerT<T> for Runner<T> {
+impl<T: Config> RunnerT<T> for Runner<T>
+where
+	BalanceOf<T>: TryFrom<U256> + Into<U256>,
+{
 	type Error = Error<T>;
 
 	fn call(
@@ -542,6 +549,8 @@ impl<'vicinity, 'config, T: Config> BackendT for SubstrateStackState<'vicinity,
 
 impl<'vicinity, 'config, T: Config> StackStateT<'config>
 	for SubstrateStackState<'vicinity, 'config, T>
+where
+	BalanceOf<T>: TryFrom<U256> + Into<U256>,
 {
 	fn metadata(&self) -> &StackSubstateMetadata<'config> {
 		self.substate.metadata()
@@ -630,7 +639,10 @@ impl<'vicinity, 'config, T: Config> StackStateT<'config>
 		T::Currency::transfer(
 			&source,
 			&target,
-			transfer.value.low_u128().unique_saturated_into(),
+			transfer
+				.value
+				.try_into()
+				.map_err(|_| ExitError::OutOfFund)?,
 			ExistenceRequirement::AllowDeath,
 		)
 		.map_err(|_| ExitError::OutOfFund)

frame/evm/src/tests.rs

@@ -268,8 +268,10 @@ fn issuance_after_tip() {
 		result.expect("EVM can be called");
 		let after_tip = <Test as Config>::Currency::total_issuance();
 		// Only base fee is burned
-		let (base_fee, _) = <Test as Config>::FeeCalculator::min_gas_price();
-		assert_eq!(after_tip, (before_tip - (base_fee.low_u64() * 21_000)));
+		let base_fee: u64 = <Test as Config>::FeeCalculator::min_gas_price()
+			.0
+			.unique_saturated_into();
+		assert_eq!(after_tip, (before_tip - (base_fee * 21_000)));
 	});
 }
 
@@ -355,7 +357,7 @@ fn refunds_and_priority_should_work() {
 		assert_eq!(after_call, before_call - total_cost);
 
 		let after_tip = EVM::account_basic(&author).0.balance;
-		assert_eq!(after_tip, (before_tip + actual_tip.low_u128()));
+		assert_eq!(after_tip, (before_tip + actual_tip));
 	});
 }
 

template/runtime/src/lib.rs

@@ -24,7 +24,7 @@ use sp_runtime::{
 	create_runtime_str, generic, impl_opaque_keys,
 	traits::{
 		AccountIdLookup, BlakeTwo256, Block as BlockT, DispatchInfoOf, Dispatchable,
-		IdentifyAccount, NumberFor, PostDispatchInfoOf, Verify,
+		IdentifyAccount, NumberFor, PostDispatchInfoOf, UniqueSaturatedInto, Verify,
 	},
 	transaction_validity::{TransactionSource, TransactionValidity, TransactionValidityError},
 	ApplyExtrinsicResult, MultiSignature,
@@ -663,7 +663,7 @@ impl_runtime_apis! {
 				to,
 				data,
 				value,
-				gas_limit.low_u64(),
+				gas_limit.unique_saturated_into(),
 				max_fee_per_gas,
 				max_priority_fee_per_gas,
 				nonce,
@@ -697,7 +697,7 @@ impl_runtime_apis! {
 				from,
 				data,
 				value,
-				gas_limit.low_u64(),
+				gas_limit.unique_saturated_into(),
 				max_fee_per_gas,
 				max_priority_fee_per_gas,
 				nonce,