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abifuzzer_test.go
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// Copyright 2020 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 abi
import (
"fmt"
"reflect"
"strings"
"testing"
fuzz "github.com/google/gofuzz"
)
// TestReplicate can be used to replicate crashers from the fuzzing tests.
// Just replace testString with the data in .quoted
func TestReplicate(t *testing.T) {
t.Parallel()
//t.Skip("Test only useful for reproducing issues")
fuzzAbi([]byte("\x20\x20\x20\x20\x20\x20\x20\x20\x80\x00\x00\x00\x20\x20\x20\x20\x00"))
//fuzzAbi([]byte("asdfasdfkadsf;lasdf;lasd;lfk"))
}
// FuzzABI is the main entrypoint for fuzzing
func FuzzABI(f *testing.F) {
f.Fuzz(func(t *testing.T, data []byte) {
fuzzAbi(data)
})
}
var (
names = []string{"_name", "name", "NAME", "name_", "__", "_name_", "n"}
stateMut = []string{"pure", "view", "payable"}
pays = []string{"true", "false"}
vNames = []string{"a", "b", "c", "d", "e", "f", "g"}
varNames = append(vNames, names...)
varTypes = []string{"bool", "address", "bytes", "string",
"uint8", "int8", "uint8", "int8", "uint16", "int16",
"uint24", "int24", "uint32", "int32", "uint40", "int40", "uint48", "int48", "uint56", "int56",
"uint64", "int64", "uint72", "int72", "uint80", "int80", "uint88", "int88", "uint96", "int96",
"uint104", "int104", "uint112", "int112", "uint120", "int120", "uint128", "int128", "uint136", "int136",
"uint144", "int144", "uint152", "int152", "uint160", "int160", "uint168", "int168", "uint176", "int176",
"uint184", "int184", "uint192", "int192", "uint200", "int200", "uint208", "int208", "uint216", "int216",
"uint224", "int224", "uint232", "int232", "uint240", "int240", "uint248", "int248", "uint256", "int256",
"bytes1", "bytes2", "bytes3", "bytes4", "bytes5", "bytes6", "bytes7", "bytes8", "bytes9", "bytes10", "bytes11",
"bytes12", "bytes13", "bytes14", "bytes15", "bytes16", "bytes17", "bytes18", "bytes19", "bytes20", "bytes21",
"bytes22", "bytes23", "bytes24", "bytes25", "bytes26", "bytes27", "bytes28", "bytes29", "bytes30", "bytes31",
"bytes32", "bytes"}
)
func unpackPack(abi ABI, method string, input []byte) ([]interface{}, bool) {
if out, err := abi.Unpack(method, input); err == nil {
_, err := abi.Pack(method, out...)
if err != nil {
// We have some false positives as we can unpack these type successfully, but not pack them
if err.Error() == "abi: cannot use []uint8 as type [0]int8 as argument" ||
err.Error() == "abi: cannot use uint8 as type int8 as argument" {
return out, false
}
panic(err)
}
return out, true
}
return nil, false
}
func packUnpack(abi ABI, method string, input *[]interface{}) bool {
if packed, err := abi.Pack(method, input); err == nil {
outptr := reflect.New(reflect.TypeOf(input))
err := abi.UnpackIntoInterface(outptr.Interface(), method, packed)
if err != nil {
panic(err)
}
out := outptr.Elem().Interface()
if !reflect.DeepEqual(input, out) {
panic(fmt.Sprintf("unpackPack is not equal, \ninput : %x\noutput: %x", input, out))
}
return true
}
return false
}
type arg struct {
name string
typ string
}
func createABI(name string, stateMutability, payable *string, inputs []arg) (ABI, error) {
sig := fmt.Sprintf(`[{ "type" : "function", "name" : "%v" `, name)
if stateMutability != nil {
sig += fmt.Sprintf(`, "stateMutability": "%v" `, *stateMutability)
}
if payable != nil {
sig += fmt.Sprintf(`, "payable": %v `, *payable)
}
if len(inputs) > 0 {
sig += `, "inputs" : [ {`
for i, inp := range inputs {
sig += fmt.Sprintf(`"name" : "%v", "type" : "%v" `, inp.name, inp.typ)
if i+1 < len(inputs) {
sig += ","
}
}
sig += "} ]"
sig += `, "outputs" : [ {`
for i, inp := range inputs {
sig += fmt.Sprintf(`"name" : "%v", "type" : "%v" `, inp.name, inp.typ)
if i+1 < len(inputs) {
sig += ","
}
}
sig += "} ]"
}
sig += `}]`
//fmt.Printf("sig: %s\n", sig)
return JSON(strings.NewReader(sig))
}
func fuzzAbi(input []byte) {
var (
fuzzer = fuzz.NewFromGoFuzz(input)
name = oneOf(fuzzer, names)
stateM = oneOfOrNil(fuzzer, stateMut)
payable = oneOfOrNil(fuzzer, pays)
arguments []arg
)
for i := 0; i < upTo(fuzzer, 10); i++ {
argName := oneOf(fuzzer, varNames)
argTyp := oneOf(fuzzer, varTypes)
switch upTo(fuzzer, 10) {
case 0: // 10% chance to make it a slice
argTyp += "[]"
case 1: // 10% chance to make it an array
argTyp += fmt.Sprintf("[%d]", 1+upTo(fuzzer, 30))
default:
}
arguments = append(arguments, arg{name: argName, typ: argTyp})
}
abi, err := createABI(name, stateM, payable, arguments)
if err != nil {
//fmt.Printf("err: %v\n", err)
panic(err)
}
structs, _ := unpackPack(abi, name, input)
_ = packUnpack(abi, name, &structs)
}
func upTo(fuzzer *fuzz.Fuzzer, max int) int {
var i int
fuzzer.Fuzz(&i)
if i < 0 {
return (-1 - i) % max
}
return i % max
}
func oneOf(fuzzer *fuzz.Fuzzer, options []string) string {
return options[upTo(fuzzer, len(options))]
}
func oneOfOrNil(fuzzer *fuzz.Fuzzer, options []string) *string {
if i := upTo(fuzzer, len(options)+1); i < len(options) {
return &options[i]
}
return nil
}