core/vm: Unit test for interpreter loop interruption

Author: gumb0

core/vm/interpreter_test.go

@@ -0,0 +1,77 @@
+// Copyright 2021 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package vm
+
+import (
+	"math/big"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/core/rawdb"
+	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/params"
+)
+
+var loopInterruptTests = []string{
+	// infinite loop using JUMP: push(2) jumpdest dup1 jump
+	"60025b8056",
+	// infinite loop using JUMPI: push(1) push(4) jumpdest dup2 dup2 jumpi
+	"600160045b818157",
+}
+
+func TestLoopInterrupt(t *testing.T) {
+	address := common.BytesToAddress([]byte("contract"))
+	vmctx := BlockContext{
+		Transfer: func(StateDB, common.Address, common.Address, *big.Int) {},
+	}
+
+	for i, tt := range loopInterruptTests {
+		statedb, _ := state.New(common.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
+		statedb.CreateAccount(address)
+		statedb.SetCode(address, common.Hex2Bytes(tt))
+		statedb.Finalise(true)
+
+		evm := NewEVM(vmctx, TxContext{}, statedb, params.AllEthashProtocolChanges, Config{})
+
+		errChannel := make(chan error)
+		timeout := make(chan bool)
+
+		go func(evm *EVM) {
+			_, _, err := evm.Call(AccountRef(common.Address{}), address, nil, math.MaxUint64, new(big.Int))
+			errChannel <- err
+		}(evm)
+
+		go func() {
+			<-time.After(time.Second)
+			timeout <- true
+		}()
+
+		evm.Cancel()
+
+		select {
+		case <-timeout:
+			t.Errorf("test %d timed out", i)
+		case err := <-errChannel:
+			if err != nil {
+				t.Errorf("test %d failure: %v", i, err)
+			}
+		}
+	}
+
+}