forked from TrueCloudLab/distribution
93 lines
2.9 KiB
Markdown
93 lines
2.9 KiB
Markdown
|
# go-fuzz-headers
|
||
|
|
This repository contains various helper functions for go fuzzing. It is mostly used in combination with [go-fuzz](https://github.com/dvyukov/go-fuzz), but compatibility with fuzzing in the standard library will also be supported. Any coverage guided fuzzing engine that provides an array or slice of bytes can be used with go-fuzz-headers.
|
||
|
|
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
Using go-fuzz-headers is easy. First create a new consumer with the bytes provided by the fuzzing engine:
|
||
|
|
|
||
|
|
```go
|
||
|
|
import (
|
||
|
|
fuzz "github.com/AdaLogics/go-fuzz-headers"
|
||
|
|
)
|
||
|
|
data := []byte{'R', 'a', 'n', 'd', 'o', 'm'}
|
||
|
|
f := fuzz.NewConsumer(data)
|
||
|
|
|
||
|
|
```
|
||
|
|
|
||
|
|
This creates a `Consumer` that consumes the bytes of the input as it uses them to fuzz different types.
|
||
|
|
|
||
|
|
After that, `f` can be used to easily create fuzzed instances of different types. Below are some examples:
|
||
|
|
|
||
|
|
### Structs
|
||
|
|
One of the most useful features of go-fuzz-headers is its ability to fill structs with the data provided by the fuzzing engine. This is done with a single line:
|
||
|
|
```go
|
||
|
|
type Person struct {
|
||
|
|
Name string
|
||
|
|
Age int
|
||
|
|
}
|
||
|
|
p := Person{}
|
||
|
|
// Fill p with values based on the data provided by the fuzzing engine:
|
||
|
|
err := f.GenerateStruct(&p)
|
||
|
|
```
|
||
|
|
|
||
|
|
This includes nested structs too. In this example, the fuzz Consumer will also insert values in `p.BestFriend`:
|
||
|
|
```go
|
||
|
|
type PersonI struct {
|
||
|
|
Name string
|
||
|
|
Age int
|
||
|
|
BestFriend PersonII
|
||
|
|
}
|
||
|
|
type PersonII struct {
|
||
|
|
Name string
|
||
|
|
Age int
|
||
|
|
}
|
||
|
|
p := PersonI{}
|
||
|
|
err := f.GenerateStruct(&p)
|
||
|
|
```
|
||
|
|
|
||
|
|
If the consumer should insert values for unexported fields as well as exported, this can be enabled with:
|
||
|
|
|
||
|
|
```go
|
||
|
|
f.AllowUnexportedFields()
|
||
|
|
```
|
||
|
|
|
||
|
|
...and disabled with:
|
||
|
|
|
||
|
|
```go
|
||
|
|
f.DisallowUnexportedFields()
|
||
|
|
```
|
||
|
|
|
||
|
|
### Other types:
|
||
|
|
|
||
|
|
Other useful APIs:
|
||
|
|
|
||
|
|
```go
|
||
|
|
createdString, err := f.GetString() // Gets a string
|
||
|
|
createdInt, err := f.GetInt() // Gets an integer
|
||
|
|
createdByte, err := f.GetByte() // Gets a byte
|
||
|
|
createdBytes, err := f.GetBytes() // Gets a byte slice
|
||
|
|
createdBool, err := f.GetBool() // Gets a boolean
|
||
|
|
err := f.FuzzMap(target_map) // Fills a map
|
||
|
|
createdTarBytes, err := f.TarBytes() // Gets bytes of a valid tar archive
|
||
|
|
err := f.CreateFiles(inThisDir) // Fills inThisDir with files
|
||
|
|
createdString, err := f.GetStringFrom("anyCharInThisString", ofThisLength) // Gets a string that consists of chars from "anyCharInThisString" and has the exact length "ofThisLength"
|
||
|
|
```
|
||
|
|
|
||
|
|
Most APIs are added as they are needed.
|
||
|
|
|
||
|
|
## Projects that use go-fuzz-headers
|
||
|
|
- [runC](https://github.com/opencontainers/runc)
|
||
|
|
- [Istio](https://github.com/istio/istio)
|
||
|
|
- [Vitess](https://github.com/vitessio/vitess)
|
||
|
|
- [Containerd](https://github.com/containerd/containerd)
|
||
|
|
|
||
|
|
Feel free to add your own project to the list, if you use go-fuzz-headers to fuzz it.
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
## Status
|
||
|
|
The project is under development and will be updated regularly.
|
||
|
|
|
||
|
|
## References
|
||
|
|
go-fuzz-headers' approach to fuzzing structs is strongly inspired by [gofuzz](https://github.com/google/gofuzz).
|