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rangeproof-fuzzer.go
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rangeproof-fuzzer.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 rangeproof
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"sort"
"github.com/scroll-tech/go-ethereum/common"
"github.com/scroll-tech/go-ethereum/ethdb/memorydb"
"github.com/scroll-tech/go-ethereum/trie"
)
type kv struct {
k, v []byte
t bool
}
type entrySlice []*kv
func (p entrySlice) Len() int { return len(p) }
func (p entrySlice) Less(i, j int) bool { return bytes.Compare(p[i].k, p[j].k) < 0 }
func (p entrySlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
type fuzzer struct {
input io.Reader
exhausted bool
}
func (f *fuzzer) randBytes(n int) []byte {
r := make([]byte, n)
if _, err := f.input.Read(r); err != nil {
f.exhausted = true
}
return r
}
func (f *fuzzer) readInt() uint64 {
var x uint64
if err := binary.Read(f.input, binary.LittleEndian, &x); err != nil {
f.exhausted = true
}
return x
}
func (f *fuzzer) randomTrie(n int) (*trie.Trie, map[string]*kv) {
trie := new(trie.Trie)
vals := make(map[string]*kv)
size := f.readInt()
// Fill it with some fluff
for i := byte(0); i < byte(size); i++ {
value := &kv{common.LeftPadBytes([]byte{i}, 32), []byte{i}, false}
value2 := &kv{common.LeftPadBytes([]byte{i + 10}, 32), []byte{i}, false}
trie.Update(value.k, value.v)
trie.Update(value2.k, value2.v)
vals[string(value.k)] = value
vals[string(value2.k)] = value2
}
if f.exhausted {
return nil, nil
}
// And now fill with some random
for i := 0; i < n; i++ {
k := f.randBytes(32)
v := f.randBytes(20)
value := &kv{k, v, false}
trie.Update(k, v)
vals[string(k)] = value
if f.exhausted {
return nil, nil
}
}
return trie, vals
}
func (f *fuzzer) fuzz() int {
maxSize := 200
tr, vals := f.randomTrie(1 + int(f.readInt())%maxSize)
if f.exhausted {
return 0 // input too short
}
var entries entrySlice
for _, kv := range vals {
entries = append(entries, kv)
}
if len(entries) <= 1 {
return 0
}
sort.Sort(entries)
var ok = 0
for {
start := int(f.readInt() % uint64(len(entries)))
end := 1 + int(f.readInt()%uint64(len(entries)-1))
testcase := int(f.readInt() % uint64(6))
index := int(f.readInt() & 0xFFFFFFFF)
index2 := int(f.readInt() & 0xFFFFFFFF)
if f.exhausted {
break
}
proof := memorydb.New()
if err := tr.Prove(entries[start].k, 0, proof); err != nil {
panic(fmt.Sprintf("Failed to prove the first node %v", err))
}
if err := tr.Prove(entries[end-1].k, 0, proof); err != nil {
panic(fmt.Sprintf("Failed to prove the last node %v", err))
}
var keys [][]byte
var vals [][]byte
for i := start; i < end; i++ {
keys = append(keys, entries[i].k)
vals = append(vals, entries[i].v)
}
if len(keys) == 0 {
return 0
}
var first, last = keys[0], keys[len(keys)-1]
testcase %= 6
switch testcase {
case 0:
// Modified key
keys[index%len(keys)] = f.randBytes(32) // In theory it can't be same
case 1:
// Modified val
vals[index%len(vals)] = f.randBytes(20) // In theory it can't be same
case 2:
// Gapped entry slice
index = index % len(keys)
keys = append(keys[:index], keys[index+1:]...)
vals = append(vals[:index], vals[index+1:]...)
case 3:
// Out of order
index1 := index % len(keys)
index2 := index2 % len(keys)
keys[index1], keys[index2] = keys[index2], keys[index1]
vals[index1], vals[index2] = vals[index2], vals[index1]
case 4:
// Set random key to nil, do nothing
keys[index%len(keys)] = nil
case 5:
// Set random value to nil, deletion
vals[index%len(vals)] = nil
// Other cases:
// Modify something in the proof db
// add stuff to proof db
// drop stuff from proof db
}
if f.exhausted {
break
}
ok = 1
//nodes, subtrie
hasMore, err := trie.VerifyRangeProof(tr.Hash(), first, last, keys, vals, proof)
if err != nil {
if hasMore {
panic("err != nil && hasMore == true")
}
}
}
return ok
}
// The function must return
// 1 if the fuzzer should increase priority of the
// given input during subsequent fuzzing (for example, the input is lexically
// correct and was parsed successfully);
// -1 if the input must not be added to corpus even if gives new coverage; and
// 0 otherwise; other values are reserved for future use.
func Fuzz(input []byte) int {
if len(input) < 100 {
return 0
}
r := bytes.NewReader(input)
f := fuzzer{
input: r,
exhausted: false,
}
return f.fuzz()
}