stateOverride: don't allow arbOS

Author: tsahee

internal/ethapi/api.go

@@ -962,12 +962,17 @@ type OverrideAccount struct {
 // StateOverride is the collection of overridden accounts.
 type StateOverride map[common.Address]OverrideAccount
 
+var arbStorageAddress = common.HexToAddress("0xA4B05FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF")
+
 // Apply overrides the fields of specified accounts into the given state.
 func (diff *StateOverride) Apply(state *state.StateDB) error {
 	if diff == nil {
 		return nil
 	}
 	for addr, account := range *diff {
+		if addr == arbStorageAddress {
+			return errors.New("overriding 0xA4B05FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF not allowed")
+		}
 		// Override account nonce.
 		if account.Nonce != nil {
 			state.SetNonce(addr, uint64(*account.Nonce))