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Fuzzing: Add archive fuzzer

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Signed-off-by: AdamKorcz <adam@adalogics.com>
This commit is contained in:
AdamKorcz 2021-07-22 16:22:01 +01:00
parent a137b64f50
commit 2556aac675
9 changed files with 655 additions and 4 deletions
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52
contrib/fuzz/archive_fuzzer.go Normal file
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@ -0,0 +1,52 @@
// +build gofuzz
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fuzz
import (
"bytes"
"context"
"io/ioutil"
"os"
fuzz "github.com/AdaLogics/go-fuzz-headers"
"github.com/containerd/containerd/archive"
)
// FuzzApply implements a fuzzer that applies
// a fuzzed tar archive on a directory
func FuzzApply(data []byte) int {
f := fuzz.NewConsumer(data)
iters, err := f.GetInt()
if err != nil {
return 0
}
maxIters := 20
tmpDir, err := ioutil.TempDir("", "prefix-test")
if err != nil {
return 0
}
defer os.RemoveAll(tmpDir)
for i := 0; i < iters%maxIters; i++ {
rBytes, err := f.TarBytes()
if err != nil {
return 0
}
r := bytes.NewReader(rBytes)
_, _ = archive.Apply(context.Background(), tmpDir, r)
}
return 1
}

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contrib/fuzz/oss_fuzz_build.sh
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@ -17,9 +17,10 @@
cd "$(dirname "${BASH_SOURCE[0]}")"
cd ../../
compile_go_fuzzer github.com/containerd/containerd/contrib/fuzz FuzzFiltersParse fuzz_filters_parse
compile_go_fuzzer github.com/containerd/containerd/contrib/fuzz FuzzPlatformsParse fuzz_platforms_parse
# Don't move docker_fuzzer.go back into contrib/fuzz
mv contrib/fuzz/docker_fuzzer.go remotes/docker/
compile_go_fuzzer github.com/containerd/containerd/remotes/docker FuzzFetcher fuzz_fetcher
mv remotes/docker/docker_fuzzer.go contrib/fuzz/
compile_go_fuzzer github.com/containerd/containerd/contrib/fuzz FuzzFiltersParse fuzz_filters_parse
compile_go_fuzzer github.com/containerd/containerd/contrib/fuzz FuzzPlatformsParse fuzz_platforms_parse
compile_go_fuzzer github.com/containerd/containerd/contrib/fuzz FuzzApply fuzz_apply

1
go.mod
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@ -3,6 +3,7 @@ module github.com/containerd/containerd
go 1.16
require (
github.com/AdaLogics/go-fuzz-headers v0.0.0-20210715213245-6c3934b029d8
github.com/Microsoft/go-winio v0.5.0
github.com/Microsoft/hcsshim v0.8.18
github.com/containerd/aufs v1.0.0

2
go.sum
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@ -22,6 +22,8 @@ cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiy
cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
github.com/AdaLogics/go-fuzz-headers v0.0.0-20210715213245-6c3934b029d8 h1:V8krnnfGj4pV65YLUm3C0/8bl7V5Nry2Pwvy3ru/wLc=
github.com/AdaLogics/go-fuzz-headers v0.0.0-20210715213245-6c3934b029d8/go.mod h1:CzsSbkDixRphAF5hS6wbMKq0eI6ccJRb7/A0M6JBnwg=
github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
github.com/Azure/go-autorest/autorest v0.11.1/go.mod h1:JFgpikqFJ/MleTTxwepExTKnFUKKszPS8UavbQYUMuw=

201
vendor/github.com/AdaLogics/go-fuzz-headers/LICENSE generated vendored Normal file
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@ -0,0 +1,201 @@
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http://www.apache.org/licenses/
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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49
vendor/github.com/AdaLogics/go-fuzz-headers/README.md generated vendored Normal file
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@ -0,0 +1,49 @@
# go-fuzz-headers
This repository contains various helper functions to be used with [go-fuzz](https://github.com/dvyukov/go-fuzz).
## Goal
The current goal of go-fuzz-headers is:
To maintain a series of helper utilities that can be used for golang projects that are integrated into OSS-fuzz and use the go-fuzz engine to fuzz more complicated types than merely strings and data arrays.
While go-fuzz-headers can be used when using go-fuzz outside of OSS-fuzz, we do not test such usage and cannot confirm that it is supported.
## Status
The project is under development and will be updated regularly.
Fuzzers that use `GenerateStruct` will not require modifications as more types get supported.
## Usage
To make use of the helper functions, a ConsumeFuzzer has to be instantiated:
```go
f := NewConsumer(data)
```
To split the input data from the fuzzer into a random set of equally large chunks:
```go
err := f.Split(3, 6)
```
...after which the consumer has the following available attributes:
```go
f.CommandPart = commandPart
f.RestOfArray = restOfArray
f.NumberOfCalls = numberOfCalls
```
To pass the input data from the fuzzer into a struct:
```go
ts := new(target_struct)
err :=f.GenerateStruct(ts)
```
or:
```go
ts := target_struct{}
err = f.GenerateStruct(&ts)
```
`GenerateStruct` will pass data from the input data to the targeted struct. Currently the following field types are supported:
1. `string`
2. `bool`
3. `int`
4. `[]string`
5. `byte`
5. `[]byte`
6. custom structures
7. `map`

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vendor/github.com/AdaLogics/go-fuzz-headers/consumer.go generated vendored Normal file
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package gofuzzheaders
import (
"archive/tar"
"bytes"
"errors"
//"fmt"
"reflect"
"unsafe"
)
type ConsumeFuzzer struct {
data []byte
CommandPart []byte
RestOfArray []byte
NumberOfCalls int
position int
fuzzUnexportedFields bool
}
func IsDivisibleBy(n int, divisibleby int) bool {
return (n % divisibleby) == 0
}
func NewConsumer(fuzzData []byte) *ConsumeFuzzer {
f := &ConsumeFuzzer{data: fuzzData, position: 0}
return f
}
func (f *ConsumeFuzzer) Split(minCalls, maxCalls int) error {
if len(f.data) == 0 {
return errors.New("Could not split")
}
numberOfCalls := int(f.data[0])
if numberOfCalls < minCalls || numberOfCalls > maxCalls {
return errors.New("Bad number of calls")
}
if len(f.data) < numberOfCalls+numberOfCalls+1 {
return errors.New("Length of data does not match required parameters")
}
// Define part 2 and 3 of the data array
commandPart := f.data[1 : numberOfCalls+1]
restOfArray := f.data[numberOfCalls+1:]
// Just a small check. It is necessary
if len(commandPart) != numberOfCalls {
return errors.New("Length of commandPart does not match number of calls")
}
// Check if restOfArray is divisible by numberOfCalls
if !IsDivisibleBy(len(restOfArray), numberOfCalls) {
return errors.New("Length of commandPart does not match number of calls")
}
f.CommandPart = commandPart
f.RestOfArray = restOfArray
f.NumberOfCalls = numberOfCalls
return nil
}
func (f *ConsumeFuzzer) AllowUnexportedFields() {
f.fuzzUnexportedFields = true
}
func (f *ConsumeFuzzer) DisallowUnexportedFields() {
f.fuzzUnexportedFields = false
}
func (f *ConsumeFuzzer) GenerateStruct(targetStruct interface{}) error {
v := reflect.ValueOf(targetStruct)
/*if !v.CanSet() {
return errors.New("This interface cannot be set")
}*/
e := v.Elem()
err := f.fuzzStruct(e)
if err != nil {
return err
}
return nil
}
func (f *ConsumeFuzzer) fuzzStruct(e reflect.Value) error {
switch e.Kind() {
case reflect.Struct:
for i := 0; i < e.NumField(); i++ {
// Useful for debugging, so we leave it for now:
//vt := e.Type().Field(i).Name
//fmt.Println("vt:::::::::::::::::::::: ", vt)
var v reflect.Value
if !e.Field(i).CanSet() {
if f.fuzzUnexportedFields {
v = reflect.NewAt(e.Field(i).Type(), unsafe.Pointer(e.Field(i).UnsafeAddr())).Elem()
}
} else {
v = e.Field(i)
}
err := f.fuzzStruct(v)
if err != nil {
return err
}
}
case reflect.String:
str, err := f.GetString()
if err != nil {
return err
}
if e.CanSet() {
e.SetString(str)
}
case reflect.Slice:
maxElements := 50
randQty, err := f.GetInt()
if err != nil {
return err
}
numOfElements := randQty % maxElements
uu := reflect.MakeSlice(e.Type(), numOfElements, numOfElements)
for i := 0; i < numOfElements; i++ {
err := f.fuzzStruct(uu.Index(i))
if err != nil {
return err
}
}
if e.CanSet() {
e.Set(uu)
}
case reflect.Uint64:
newInt, err := f.GetInt()
if err != nil {
return err
}
if e.CanSet() {
e.SetUint(uint64(newInt))
}
case reflect.Int:
newInt, err := f.GetInt()
if err != nil {
return err
}
if e.CanSet() {
e.SetInt(int64(newInt))
}
case reflect.Map:
if e.CanSet() {
e.Set(reflect.MakeMap(e.Type()))
maxElements := 50
randQty, err := f.GetInt()
if err != nil {
return err
}
numOfElements := randQty % maxElements
for i := 0; i < numOfElements; i++ {
key := reflect.New(e.Type().Key()).Elem()
err := f.fuzzStruct(key)
if err != nil {
return err
}
val := reflect.New(e.Type().Elem()).Elem()
err = f.fuzzStruct(val)
if err != nil {
return err
}
e.SetMapIndex(key, val)
}
}
case reflect.Ptr:
if e.CanSet() {
e.Set(reflect.New(e.Type().Elem()))
err := f.fuzzStruct(e.Elem())
if err != nil {
return err
}
return nil
}
case reflect.Uint8:
b, err := f.GetByte()
if err != nil {
return err
}
if e.CanSet() {
e.SetUint(uint64(b))
}
default:
return nil
}
return nil
}
func (f *ConsumeFuzzer) GetStringArray() (reflect.Value, error) {
// The max size of the array:
max := 20
arraySize := f.position
if arraySize > max {
arraySize = max
}
elemType := reflect.TypeOf("string")
stringArray := reflect.MakeSlice(reflect.SliceOf(elemType), arraySize, arraySize)
if f.position+arraySize >= len(f.data) {
return stringArray, errors.New("Could not make string array")
}
for i := 0; i < arraySize; i++ {
stringSize := int(f.data[f.position])
if f.position+stringSize >= len(f.data) {
return stringArray, nil
}
stringToAppend := string(f.data[f.position : f.position+stringSize])
strVal := reflect.ValueOf(stringToAppend)
stringArray = reflect.Append(stringArray, strVal)
f.position = f.position + stringSize
}
return stringArray, nil
}
func (f *ConsumeFuzzer) GetInt() (int, error) {
if f.position >= len(f.data) {
return 0, errors.New("Not enough bytes to create int")
}
returnInt := int(f.data[f.position])
f.position++
return returnInt, nil
}
func (f *ConsumeFuzzer) GetByte() (byte, error) {
if len(f.data) == 0 {
return 0x00, errors.New("Not enough bytes to get byte")
}
if f.position >= len(f.data) {
return 0x00, errors.New("Not enough bytes to get byte")
}
returnByte := f.data[f.position]
f.position += 1
return returnByte, nil
}
func (f *ConsumeFuzzer) GetBytes() ([]byte, error) {
if len(f.data) == 0 || f.position >= len(f.data) {
return nil, errors.New("Not enough bytes to create byte array")
}
length := int(f.data[f.position])
byteBegin := f.position + 1
if byteBegin >= len(f.data) {
return nil, errors.New("Not enough bytes to create byte array")
}
if length == 0 {
return nil, errors.New("Zero-length is not supported")
}
if byteBegin+length >= len(f.data) {
return nil, errors.New("Not enough bytes to create byte array")
}
b := f.data[byteBegin : byteBegin+length]
f.position = byteBegin + length
return b, nil
}
func (f *ConsumeFuzzer) GetString() (string, error) {
if f.position >= len(f.data) {
return "nil", errors.New("Not enough bytes to create string")
}
length := int(f.data[f.position])
byteBegin := f.position + 1
if byteBegin >= len(f.data) {
return "nil", errors.New("Not enough bytes to create string")
}
if byteBegin+length > len(f.data) {
return "nil", errors.New("Not enough bytes to create string")
}
str := string(f.data[byteBegin : byteBegin+length])
f.position = byteBegin + length
return str, nil
}
func (f *ConsumeFuzzer) GetBool() (bool, error) {
if f.position >= len(f.data) {
return false, errors.New("Not enough bytes to create bool")
}
if IsDivisibleBy(int(f.data[f.position]), 2) {
f.position++
return true, nil
} else {
f.position++
return false, nil
}
}
func (f *ConsumeFuzzer) FuzzMap(m interface{}) error {
err := f.GenerateStruct(m)
if err != nil {
return err
}
return nil
}
// TarBytes returns valid tar bytes for a tar archive
func (f *ConsumeFuzzer) TarBytes() ([]byte, error) {
var buf bytes.Buffer
tw := tar.NewWriter(&buf)
numberOfFiles, err := f.GetInt()
if err != nil {
return nil, err
}
maxNoOfFiles := 100000
for i := 0; i < numberOfFiles%maxNoOfFiles; i++ {
filename, err := f.GetString()
if err != nil {
return nil, err
}
filebody, err := f.GetBytes()
if err != nil {
return nil, err
}
hdr := &tar.Header{}
err = f.GenerateStruct(hdr)
if err != nil {
return nil, err
}
hdr.Name = filename
hdr.Size = int64(len(filebody))
hdr.Mode = 0600
if err := tw.WriteHeader(hdr); err != nil {
return nil, err
}
if _, err := tw.Write(filebody); err != nil {
return nil, err
}
}
if err := tw.Close(); err != nil {
return nil, err
}
//fmt.Println(string(buf.Bytes()))
return buf.Bytes(), nil
}

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module github.com/AdaLogics/go-fuzz-headers
go 1.13

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vendor/modules.txt vendored
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# github.com/AdaLogics/go-fuzz-headers v0.0.0-20210715213245-6c3934b029d8
## explicit
github.com/AdaLogics/go-fuzz-headers
# github.com/Microsoft/go-winio v0.5.0
## explicit
github.com/Microsoft/go-winio