From 7bb22f98e137c88bed1a0d118b5538bb5b6dceff Mon Sep 17 00:00:00 2001
From: AdamKorcz <adam@adalogics.com>
Date: Sat, 22 May 2021 17:32:24 +0100
Subject: [PATCH] Add fuzzer

---
 libcontainer/specconv/specconv_fuzzer.go | 96 ++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 libcontainer/specconv/specconv_fuzzer.go

diff --git a/libcontainer/specconv/specconv_fuzzer.go b/libcontainer/specconv/specconv_fuzzer.go
new file mode 100644
index 00000000000..a214e8cddb4
--- /dev/null
+++ b/libcontainer/specconv/specconv_fuzzer.go
@@ -0,0 +1,96 @@
+// +build gofuzz
+
+package specconv
+
+import (
+	"io/ioutil"
+	"os"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups/systemd"
+	"github.com/opencontainers/runc/libcontainer/configs"
+	"github.com/opencontainers/runc/libcontainer/configs/validate"
+	"github.com/opencontainers/runtime-spec/specs-go"
+
+	gofuzzheaders "github.com/AdaLogics/go-fuzz-headers"
+)
+
+func newTestRoot(name string) (string, error) {
+	dir, err := ioutil.TempDir("", name)
+	if err != nil {
+		return "", err
+	}
+	if err := os.MkdirAll(dir, 0700); err != nil {
+		return "", err
+	}
+	return dir, nil
+}
+
+func Fuzz(data []byte) int {
+	if len(data) < 30 {
+		return -1
+	}
+	f := gofuzzheaders.NewConsumer(data)
+	linuxSpec := new(specs.Linux)
+	err := f.GenerateStruct(linuxSpec)
+	if err != nil {
+		return 0
+	}
+
+	// Create spec.Spec
+	spec := new(specs.Spec)
+	err = f.GenerateStruct(spec)
+	if err != nil {
+		return 0
+	}
+	spec.Linux = linuxSpec
+
+	// Create CreateOpts
+	opts := new(CreateOpts)
+	err = f.GenerateStruct(opts)
+	if err != nil {
+		return 0
+	}
+	opts.Spec = spec
+	rootfs, err := newTestRoot("libcontainer")
+	if err != nil {
+		return 0
+	}
+	config := newTemplateConfig(&fuzzTParam{
+		rootfs: rootfs,
+		userns: false,
+	})
+	err = f.GenerateStruct(config)
+	if err != nil {
+		return 0
+	}
+	config.Rootfs = rootfs
+
+	// Add network
+	cn := new(configs.Network)
+	err = f.GenerateStruct(cn)
+	if err != nil {
+		return 0
+	}
+
+	config.Networks = []*configs.Network{cn}
+
+	validator := validate.New()
+	err = validator.Validate(config)
+	if err != nil {
+		return 0
+	}
+	c, err := CreateCgroupConfig(opts, nil)
+	if err != nil {
+		return 0
+	}
+
+	path, err := newTestRoot("fuzzDir")
+	if err != nil {
+		return 0
+	}
+	um := systemd.NewUnifiedManager(c, path, false)
+	err = um.Set(config)
+	err = um.Apply(int(data[0]))
+	err = um.Destroy()
+	return 1
+}