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cmd/evm: add --prestate, --sender, --json flags for fuzzing (#14476)

This commit is contained in:
Martin Holst Swende 2017-06-07 17:09:08 +02:00 committed by Felix Lange
parent bc24b7a912
commit 80f7c6c299
8 changed files with 295 additions and 35 deletions
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60
cmd/evm/json_logger.go Normal file
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@ -0,0 +1,60 @@
// Copyright 2017 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 main
import (
"encoding/json"
"io"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/core/vm"
)
type JSONLogger struct {
encoder *json.Encoder
}
func NewJSONLogger(writer io.Writer) *JSONLogger {
return &JSONLogger{json.NewEncoder(writer)}
}
// CaptureState outputs state information on the logger.
func (l *JSONLogger) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, memory *vm.Memory, stack *vm.Stack, contract *vm.Contract, depth int, err error) error {
return l.encoder.Encode(vm.StructLog{
Pc: pc,
Op: op,
Gas: gas + cost,
GasCost: cost,
Memory: memory.Data(),
Stack: stack.Data(),
Storage: nil,
Depth: depth,
Err: err,
})
}
// CaptureEnd is triggered at end of execution.
func (l *JSONLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration) error {
type endLog struct {
Output string `json:"output"`
GasUsed math.HexOrDecimal64 `json:"gasUsed"`
Time time.Duration `json:"time"`
}
return l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t})
}

15
cmd/evm/main.go
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@ -90,6 +90,18 @@ var (
Name: "nogasmetering",
Usage: "disable gas metering",
}
GenesisFlag = cli.StringFlag{
Name: "prestate",
Usage: "JSON file with prestate (genesis) config",
}
MachineFlag = cli.BoolFlag{
Name: "json",
Usage: "output trace logs in machine readable format (json)",
}
SenderFlag = cli.StringFlag{
Name: "sender",
Usage: "The transaction origin",
}
)
func init() {
@ -108,6 +120,9 @@ func init() {
MemProfileFlag,
CPUProfileFlag,
StatDumpFlag,
GenesisFlag,
MachineFlag,
SenderFlag,
}
app.Commands = []cli.Command{
compileCommand,

83
cmd/evm/runner.go
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@ -18,6 +18,7 @@ package main
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"os"
@ -29,11 +30,13 @@ import (
"github.com/ethereum/go-ethereum/cmd/evm/internal/compiler"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/core/vm/runtime"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
cli "gopkg.in/urfave/cli.v1"
)
@ -45,17 +48,59 @@ var runCommand = cli.Command{
Description: `The run command runs arbitrary EVM code.`,
}
// readGenesis will read the given JSON format genesis file and return
// the initialized Genesis structure
func readGenesis(genesisPath string) *core.Genesis {
// Make sure we have a valid genesis JSON
//genesisPath := ctx.Args().First()
if len(genesisPath) == 0 {
utils.Fatalf("Must supply path to genesis JSON file")
}
file, err := os.Open(genesisPath)
if err != nil {
utils.Fatalf("Failed to read genesis file: %v", err)
}
defer file.Close()
genesis := new(core.Genesis)
if err := json.NewDecoder(file).Decode(genesis); err != nil {
utils.Fatalf("invalid genesis file: %v", err)
}
return genesis
}
func runCmd(ctx *cli.Context) error {
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
glogger.Verbosity(log.Lvl(ctx.GlobalInt(VerbosityFlag.Name)))
log.Root().SetHandler(glogger)
var (
db, _ = ethdb.NewMemDatabase()
statedb, _ = state.New(common.Hash{}, db)
tracer vm.Tracer
debugLogger *vm.StructLogger
statedb *state.StateDB
chainConfig *params.ChainConfig
sender = common.StringToAddress("sender")
logger = vm.NewStructLogger(nil)
)
if ctx.GlobalBool(MachineFlag.Name) {
tracer = NewJSONLogger(os.Stdout)
} else if ctx.GlobalBool(DebugFlag.Name) {
debugLogger = vm.NewStructLogger(nil)
tracer = debugLogger
} else {
debugLogger = vm.NewStructLogger(nil)
}
if ctx.GlobalString(GenesisFlag.Name) != "" {
gen := readGenesis(ctx.GlobalString(GenesisFlag.Name))
_, statedb = gen.ToBlock()
chainConfig = gen.Config
} else {
var db, _ = ethdb.NewMemDatabase()
statedb, _ = state.New(common.Hash{}, db)
}
if ctx.GlobalString(SenderFlag.Name) != "" {
sender = common.HexToAddress(ctx.GlobalString(SenderFlag.Name))
}
statedb.CreateAccount(sender)
var (
@ -95,16 +140,16 @@ func runCmd(ctx *cli.Context) error {
}
code = common.Hex2Bytes(string(bytes.TrimRight(hexcode, "\n")))
}
initialGas := ctx.GlobalUint64(GasFlag.Name)
runtimeConfig := runtime.Config{
Origin: sender,
State: statedb,
GasLimit: ctx.GlobalUint64(GasFlag.Name),
GasLimit: initialGas,
GasPrice: utils.GlobalBig(ctx, PriceFlag.Name),
Value: utils.GlobalBig(ctx, ValueFlag.Name),
EVMConfig: vm.Config{
Tracer: logger,
Debug: ctx.GlobalBool(DebugFlag.Name),
Tracer: tracer,
Debug: ctx.GlobalBool(DebugFlag.Name) || ctx.GlobalBool(MachineFlag.Name),
DisableGasMetering: ctx.GlobalBool(DisableGasMeteringFlag.Name),
},
}
@ -122,15 +167,19 @@ func runCmd(ctx *cli.Context) error {
defer pprof.StopCPUProfile()
}
if chainConfig != nil {
runtimeConfig.ChainConfig = chainConfig
}
tstart := time.Now()
var leftOverGas uint64
if ctx.GlobalBool(CreateFlag.Name) {
input := append(code, common.Hex2Bytes(ctx.GlobalString(InputFlag.Name))...)
ret, _, err = runtime.Create(input, &runtimeConfig)
ret, _, leftOverGas, err = runtime.Create(input, &runtimeConfig)
} else {
receiver := common.StringToAddress("receiver")
statedb.SetCode(receiver, code)
ret, err = runtime.Call(receiver, common.Hex2Bytes(ctx.GlobalString(InputFlag.Name)), &runtimeConfig)
ret, leftOverGas, err = runtime.Call(receiver, common.Hex2Bytes(ctx.GlobalString(InputFlag.Name)), &runtimeConfig)
}
execTime := time.Since(tstart)
@ -153,8 +202,10 @@ func runCmd(ctx *cli.Context) error {
}
if ctx.GlobalBool(DebugFlag.Name) {
if debugLogger != nil {
fmt.Fprintln(os.Stderr, "#### TRACE ####")
vm.WriteTrace(os.Stderr, logger.StructLogs())
vm.WriteTrace(os.Stderr, debugLogger.StructLogs())
}
fmt.Fprintln(os.Stderr, "#### LOGS ####")
vm.WriteLogs(os.Stderr, statedb.Logs())
}
@ -167,14 +218,18 @@ heap objects: %d
allocations: %d
total allocations: %d
GC calls: %d
Gas used: %d
`, execTime, mem.HeapObjects, mem.Alloc, mem.TotalAlloc, mem.NumGC)
`, execTime, mem.HeapObjects, mem.Alloc, mem.TotalAlloc, mem.NumGC, initialGas-leftOverGas)
}
if tracer != nil {
tracer.CaptureEnd(ret, initialGas-leftOverGas, execTime)
} else {
fmt.Printf("0x%x\n", ret)
}
fmt.Printf("0x%x", ret)
if err != nil {
fmt.Printf(" error: %v", err)
fmt.Printf(" error: %v\n", err)
}
fmt.Println()
return nil
}

95
core/vm/gen_structlog.go Normal file
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@ -0,0 +1,95 @@
// Code generated by github.com/fjl/gencodec. DO NOT EDIT.
package vm
import (
"encoding/json"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/common/math"
)
func (s StructLog) MarshalJSON() ([]byte, error) {
type StructLog struct {
Pc uint64 `json:"pc"`
Op OpCode `json:"op"`
Gas math.HexOrDecimal64 `json:"gas"`
GasCost math.HexOrDecimal64 `json:"gasCost"`
Memory hexutil.Bytes `json:"memory"`
Stack []*math.HexOrDecimal256 `json:"stack"`
Storage map[common.Hash]common.Hash `json:"-"`
Depth int `json:"depth"`
Err error `json:"error"`
OpName string `json:"opName"`
MemorySize int `json:"memSize"`
}
var enc StructLog
enc.Pc = s.Pc
enc.Op = s.Op
enc.Gas = math.HexOrDecimal64(s.Gas)
enc.GasCost = math.HexOrDecimal64(s.GasCost)
enc.Memory = s.Memory
if s.Stack != nil {
enc.Stack = make([]*math.HexOrDecimal256, len(s.Stack))
for k, v := range s.Stack {
enc.Stack[k] = (*math.HexOrDecimal256)(v)
}
}
enc.Storage = s.Storage
enc.Depth = s.Depth
enc.Err = s.Err
enc.OpName = s.OpName()
enc.MemorySize = s.MemorySize()
return json.Marshal(&enc)
}
func (s *StructLog) UnmarshalJSON(input []byte) error {
type StructLog struct {
Pc *uint64 `json:"pc"`
Op *OpCode `json:"op"`
Gas *math.HexOrDecimal64 `json:"gas"`
GasCost *math.HexOrDecimal64 `json:"gasCost"`
Memory hexutil.Bytes `json:"memory"`
Stack []*math.HexOrDecimal256 `json:"stack"`
Storage map[common.Hash]common.Hash `json:"-"`
Depth *int `json:"depth"`
Err *error `json:"error"`
}
var dec StructLog
if err := json.Unmarshal(input, &dec); err != nil {
return err
}
if dec.Pc != nil {
s.Pc = *dec.Pc
}
if dec.Op != nil {
s.Op = *dec.Op
}
if dec.Gas != nil {
s.Gas = uint64(*dec.Gas)
}
if dec.GasCost != nil {
s.GasCost = uint64(*dec.GasCost)
}
if dec.Memory != nil {
s.Memory = dec.Memory
}
if dec.Stack != nil {
s.Stack = make([]*big.Int, len(dec.Stack))
for k, v := range dec.Stack {
s.Stack[k] = (*big.Int)(v)
}
}
if dec.Storage != nil {
s.Storage = dec.Storage
}
if dec.Depth != nil {
s.Depth = *dec.Depth
}
if dec.Err != nil {
s.Err = *dec.Err
}
return nil
}

52
core/vm/logger.go
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@ -21,8 +21,10 @@ import (
"fmt"
"io"
"math/big"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/core/types"
)
@ -47,18 +49,38 @@ type LogConfig struct {
Limit int // maximum length of output, but zero means unlimited
}
//go:generate gencodec -type StructLog -field-override structLogMarshaling -out gen_structlog.go
// StructLog is emitted to the EVM each cycle and lists information about the current internal state
// prior to the execution of the statement.
type StructLog struct {
Pc uint64
Op OpCode
Gas uint64
GasCost uint64
Memory []byte
Stack []*big.Int
Storage map[common.Hash]common.Hash
Depth int
Err error
Pc uint64 `json:"pc"`
Op OpCode `json:"op"`
Gas uint64 `json:"gas"`
GasCost uint64 `json:"gasCost"`
Memory []byte `json:"memory"`
Stack []*big.Int `json:"stack"`
Storage map[common.Hash]common.Hash `json:"-"`
Depth int `json:"depth"`
Err error `json:"error"`
}
// overrides for gencodec
type structLogMarshaling struct {
Stack []*math.HexOrDecimal256
Gas math.HexOrDecimal64
GasCost math.HexOrDecimal64
Memory hexutil.Bytes
OpName string `json:"opName"`
MemorySize int `json:"memSize"`
}
func (s *StructLog) OpName() string {
return s.Op.String()
}
func (s *StructLog) MemorySize() int {
return len(s.Memory)
}
// Tracer is used to collect execution traces from an EVM transaction
@ -68,6 +90,7 @@ type StructLog struct {
// if you need to retain them beyond the current call.
type Tracer interface {
CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, contract *Contract, depth int, err error) error
CaptureEnd(output []byte, gasUsed uint64, t time.Duration) error
}
// StructLogger is an EVM state logger and implements Tracer.
@ -82,7 +105,7 @@ type StructLogger struct {
changedValues map[common.Address]Storage
}
// NewLogger returns a new logger
// NewStructLogger returns a new logger
func NewStructLogger(cfg *LogConfig) *StructLogger {
logger := &StructLogger{
changedValues: make(map[common.Address]Storage),
@ -93,9 +116,9 @@ func NewStructLogger(cfg *LogConfig) *StructLogger {
return logger
}
// captureState logs a new structured log message and pushes it out to the environment
// CaptureState logs a new structured log message and pushes it out to the environment
//
// captureState also tracks SSTORE ops to track dirty values.
// CaptureState also tracks SSTORE ops to track dirty values.
func (l *StructLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, contract *Contract, depth int, err error) error {
// check if already accumulated the specified number of logs
if l.cfg.Limit != 0 && l.cfg.Limit <= len(l.logs) {
@ -164,6 +187,11 @@ func (l *StructLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost ui
return nil
}
func (l *StructLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration) error {
fmt.Printf("0x%x", output)
return nil
}
// StructLogs returns a list of captured log entries
func (l *StructLogger) StructLogs() []StructLog {
return l.logs

12
core/vm/runtime/runtime.go
View File

@ -125,7 +125,7 @@ func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error) {
}
// Create executes the code using the EVM create method
func Create(input []byte, cfg *Config) ([]byte, common.Address, error) {
func Create(input []byte, cfg *Config) ([]byte, common.Address, uint64, error) {
if cfg == nil {
cfg = new(Config)
}
@ -141,13 +141,13 @@ func Create(input []byte, cfg *Config) ([]byte, common.Address, error) {
)
// Call the code with the given configuration.
code, address, _, err := vmenv.Create(
code, address, leftOverGas, err := vmenv.Create(
sender,
input,
cfg.GasLimit,
cfg.Value,
)
return code, address, err
return code, address, leftOverGas, err
}
// Call executes the code given by the contract's address. It will return the
@ -155,14 +155,14 @@ func Create(input []byte, cfg *Config) ([]byte, common.Address, error) {
//
// Call, unlike Execute, requires a config and also requires the State field to
// be set.
func Call(address common.Address, input []byte, cfg *Config) ([]byte, error) {
func Call(address common.Address, input []byte, cfg *Config) ([]byte, uint64, error) {
setDefaults(cfg)
vmenv := NewEnv(cfg, cfg.State)
sender := cfg.State.GetOrNewStateObject(cfg.Origin)
// Call the code with the given configuration.
ret, _, err := vmenv.Call(
ret, leftOverGas, err := vmenv.Call(
sender,
address,
input,
@ -170,5 +170,5 @@ func Call(address common.Address, input []byte, cfg *Config) ([]byte, error) {
cfg.Value,
)
return ret, err
return ret, leftOverGas, err
}

2
core/vm/runtime/runtime_test.go
View File

@ -106,7 +106,7 @@ func TestCall(t *testing.T) {
byte(vm.RETURN),
})
ret, err := Call(address, nil, &Config{State: state})
ret, _, err := Call(address, nil, &Config{State: state})
if err != nil {
t.Fatal("didn't expect error", err)
}

7
internal/ethapi/tracer.go
View File

@ -21,6 +21,7 @@ import (
"errors"
"fmt"
"math/big"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
@ -344,6 +345,12 @@ func (jst *JavascriptTracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode,
return nil
}
// CaptureEnd is called after the call finishes
func (jst *JavascriptTracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration) error {
//TODO! @Arachnid please figure out of there's anything we can use this method for
return nil
}
// GetResult calls the Javascript 'result' function and returns its value, or any accumulated error
func (jst *JavascriptTracer) GetResult() (result interface{}, err error) {
if jst.err != nil {