Refactor fuzzing

Structure the fuzz implementation to be closer to what go native will support.
Add Makefile target to enable smoketesting fuzzers.
Add smoketest as CI workflow.

Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>

.github/workflows/cifuzz.yaml

@@ -0,0 +1,20 @@
+name: CIFuzz
+on:
+  pull_request:
+    branches:
+      - main
+jobs:
+  Fuzzing:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Restore Go cache
+      uses: actions/cache@v1
+      with:
+        path: /home/runner/work/_temp/_github_home/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+    - name: Smoke test Fuzzers
+      run: make fuzz-smoketest

.gitignore

@@ -5,7 +5,6 @@
 *.so
 *.dylib
 bin
-testbin
 
 # Test binary, build with `go test -c`
 *.test
@@ -22,3 +21,5 @@ testbin
 *.swp
 *.swo
 *~
+
+build/

Makefile

@@ -113,7 +113,7 @@ GEN_CRD_API_REFERENCE_DOCS = $(shell pwd)/bin/gen-crd-api-reference-docs
 gen-crd-api-reference-docs:
 	$(call go-install-tool,$(GEN_CRD_API_REFERENCE_DOCS),github.com/ahmetb/gen-crd-api-reference-docs@v0.3.0)
 
-ENVTEST_ASSETS_DIR=$(shell pwd)/testbin
+ENVTEST_ASSETS_DIR=$(shell pwd)/build/testbin
 ENVTEST_KUBERNETES_VERSION?=latest
 install-envtest: setup-envtest
 	mkdir -p ${ENVTEST_ASSETS_DIR}
@@ -137,3 +137,23 @@ GOBIN=$(PROJECT_DIR)/bin go install $(2) ;\
 rm -rf $$TMP_DIR ;\
 }
 endef
+
+# Build fuzzers
+fuzz-build:
+	rm -rf $(shell pwd)/build/fuzz/
+	mkdir -p $(shell pwd)/build/fuzz/out/
+
+	docker build . --tag local-fuzzing:latest -f tests/fuzz/Dockerfile.builder
+	docker run --rm \
+		-e FUZZING_LANGUAGE=go -e SANITIZER=address \
+		-e CIFUZZ_DEBUG='True' -e OSS_FUZZ_PROJECT_NAME=fluxcd \
+		-v "$(shell pwd)/build/fuzz/out":/out \
+		local-fuzzing:latest
+
+# Run each fuzzer once to ensure they are working
+fuzz-smoketest: fuzz-build
+	docker run --rm \
+		-v "$(shell pwd)/build/fuzz/out":/out \
+		-v "$(shell pwd)/tests/fuzz/oss_fuzz_run.sh":/runner.sh \
+		local-fuzzing:latest \
+		bash -c "/runner.sh"

api/v2beta1/helmrelease_types.go

@@ -820,8 +820,10 @@ func (in HelmReleaseStatus) GetHelmChart() (string, string) {
 	if in.HelmChart == "" {
 		return "", ""
 	}
-	split := strings.Split(in.HelmChart, string(types.Separator))
+	if split := strings.Split(in.HelmChart, string(types.Separator)); len(split) > 1 {
 		return split[0], split[1]
+	}
+	return "", ""
 }
 
 // HelmReleaseProgressing resets any failures and registers progress toward

fuzz/Dockerfile

@@ -1,21 +0,0 @@
-FROM golang:1.16-buster as builder
-
-RUN apt-get update && apt-get install -y clang git
-RUN git clone --branch fuzz1 --depth 1 https://github.com/AdamKorcz/helm-controller /helm-controller
-COPY fuzz.go /helm-controller/controllers/
-RUN cd /helm-controller/controllers \
-	&& go get github.com/AdaLogics/go-fuzz-headers
-
-RUN cd / \
-	&& go get -u github.com/mdempsky/go114-fuzz-build
-
-RUN mkdir /fuzzers
-RUN cd /helm-controller/controllers \
-	&& go114-fuzz-build -o FuzzHelmreleaseComposeValues.a -func FuzzHelmreleaseComposeValues . \
-	&& clang -o /fuzzers/FuzzHelmreleaseComposeValues FuzzHelmreleaseComposeValues.a -fsanitize=fuzzer
-RUN cd /helm-controller/controllers \
-	&& go114-fuzz-build -o FuzzHelmreleasereconcile.a -func FuzzHelmreleasereconcile . \
-	&& clang -o /fuzzers/FuzzHelmreleasereconcile FuzzHelmreleasereconcile.a -fsanitize=fuzzer
-
-# Uncomment here to run the fuzzer
-#RUN /fuzzers/FuzzHelmreleaseComposeValues

fuzz/fuzz.go

@@ -1,147 +0,0 @@
-//go:build gofuzz
-// +build gofuzz
-
-/*
-Copyright 2020 The Flux 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 controllers
-
-import (
-	"context"
-	v2 "github.com/fluxcd/helm-controller/api/v2beta1"
-	"github.com/go-logr/logr"
-	corev1 "k8s.io/api/core/v1"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/apimachinery/pkg/runtime"
-	"sigs.k8s.io/controller-runtime/pkg/client/fake"
-	"sigs.k8s.io/controller-runtime/pkg/log"
-	"sync"
-
-	fuzz "github.com/AdaLogics/go-fuzz-headers"
-)
-
-var (
-	initter sync.Once
-	scheme  *runtime.Scheme
-)
-
-// An init function that is invoked by way of sync.Do
-func initFunc() {
-	scheme = runtime.NewScheme()
-	err := corev1.AddToScheme(scheme)
-	if err != nil {
-		panic(err)
-	}
-	err = v2.AddToScheme(scheme)
-	if err != nil {
-		panic(err)
-	}
-}
-
-// FuzzHelmreleaseComposeValues implements a fuzzer
-// that targets HelmReleaseReconciler.composeValues()
-func FuzzHelmreleaseComposeValues(data []byte) int {
-	initter.Do(initFunc)
-
-	f := fuzz.NewConsumer(data)
-
-	hr := v2.HelmRelease{}
-	err := f.GenerateStruct(&hr)
-	if err != nil {
-		return 0
-	}
-
-	r, err := createReconciler(f)
-	if err != nil {
-		return 0
-	}
-
-	_, _ = r.composeValues(logr.NewContext(context.TODO(), log.NullLogger{}), hr)
-	return 1
-}
-
-// FuzzHelmreleasereconcile implements a fuzzer
-// that targets HelmReleaseReconciler.reconcile()
-func FuzzHelmreleasereconcile(data []byte) int {
-	initter.Do(initFunc)
-
-	f := fuzz.NewConsumer(data)
-
-	hr := v2.HelmRelease{}
-	err := f.GenerateStruct(&hr)
-	if err != nil {
-		return 0
-	}
-
-	r, err := createReconciler(f)
-	if err != nil {
-		return 0
-	}
-
-	_, _, _ = r.reconcile(logr.NewContext(context.TODO(), log.NullLogger{}), hr)
-	return 1
-}
-
-// Allows the fuzzer to create a reconciler
-func createReconciler(f *fuzz.ConsumeFuzzer) (*HelmReleaseReconciler, error) {
-	// Get the type of object:
-	var resources []runtime.Object
-	r := &HelmReleaseReconciler{}
-	getSecret, err := f.GetBool()
-	if err != nil {
-		return r, err
-	}
-	name, err := f.GetString()
-	if err != nil {
-		return r, err
-	}
-	if getSecret {
-		inputMap := make(map[string][]byte)
-		err = f.FuzzMap(&inputMap)
-		if err != nil {
-			return r, err
-		}
-		resources = []runtime.Object{
-			valuesSecret(name, inputMap),
-		}
-	} else {
-		inputMap := make(map[string]string)
-		err = f.FuzzMap(&inputMap)
-		if err != nil {
-			return r, err
-		}
-		resources = []runtime.Object{
-			valuesConfigMap(name, inputMap),
-		}
-	}
-	c := fake.NewFakeClientWithScheme(scheme, resources...)
-	r.Client = c
-	return r, nil
-}
-
-// Taken from
-// https://github.com/fluxcd/helm-controller/blob/main/controllers/helmrelease_controller_test.go#L282
-func valuesSecret(name string, data map[string][]byte) *corev1.Secret {
-	return &corev1.Secret{
-		ObjectMeta: metav1.ObjectMeta{Name: name},
-		Data:       data,
-	}
-}
-
-// Taken from 
-// https://github.com/fluxcd/helm-controller/blob/main/controllers/helmrelease_controller_test.go#L289
-func valuesConfigMap(name string, data map[string]string) *corev1.ConfigMap {
-	return &corev1.ConfigMap{
-		ObjectMeta: metav1.ObjectMeta{Name: name},
-		Data:       data,
-	}
-}

tests/fuzz/Dockerfile.builder

@@ -0,0 +1,6 @@
+FROM gcr.io/oss-fuzz-base/base-builder-go
+
+COPY ./ $GOPATH/src/github.com/fluxcd/helm-controller/
+COPY ./tests/fuzz/oss_fuzz_build.sh $SRC/build.sh
+
+WORKDIR $SRC

tests/fuzz/README.md

@@ -0,0 +1,45 @@
+# fuzz testing
+
+Flux is part of Google's [oss fuzz] program which provides continuous fuzzing for 
+open source projects. 
+
+The long running fuzzing execution is configured in the [oss-fuzz repository].
+Shorter executions are done on a per-PR basis, configured as a [github workflow].
+
+For fuzzers to be called, they must be compiled within [oss_fuzz_build.sh](./oss_fuzz_build.sh).
+
+### Testing locally
+
+Build fuzzers:
+
+```bash
+make fuzz-build
+```
+All fuzzers will be built into `./build/fuzz/out`. 
+
+Smoke test fuzzers:
+
+```bash
+make fuzz-smoketest
+```
+
+The smoke test runs each fuzzer once to ensure they are fully functional.
+
+Run fuzzer locally:
+```bash
+./build/fuzz/out/fuzz_conditions_match
+```
+
+Run fuzzer inside a container:
+
+```bash
+	docker run --rm -ti \
+		-v "$(pwd)/build/fuzz/out":/out \
+		gcr.io/oss-fuzz/fluxcd \
+		/out/fuzz_conditions_match
+```
+
+
+[oss fuzz]: https://github.com/google/oss-fuzz
+[oss-fuzz repository]: https://github.com/google/oss-fuzz/tree/master/projects/fluxcd
+[github workflow]: .github/workflows/cifuzz.yaml

tests/fuzz/fuzz_controllers.go

@@ -0,0 +1,139 @@
+//go:build gofuzz
+// +build gofuzz
+
+/*
+Copyright 2022 The Flux 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 controllers
+
+import (
+	"context"
+	"sync"
+
+	v2 "github.com/fluxcd/helm-controller/api/v2beta1"
+	sourcev1 "github.com/fluxcd/source-controller/api/v1beta1"
+	"github.com/go-logr/logr"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client/fake"
+
+	fuzz "github.com/AdaLogics/go-fuzz-headers"
+)
+
+var (
+	doOnce sync.Once
+	scheme = runtime.NewScheme()
+)
+
+// An init function that is invoked by way of sync.Do
+func initFunc() {
+	_ = corev1.AddToScheme(scheme)
+	_ = v2.AddToScheme(scheme)
+	_ = sourcev1.AddToScheme(scheme)
+}
+
+// FuzzHelmreleaseComposeValues implements a fuzzer
+// that targets HelmReleaseReconciler.composeValues().
+func FuzzHelmreleaseComposeValues(data []byte) int {
+	doOnce.Do(initFunc)
+
+	f := fuzz.NewConsumer(data)
+
+	resources, err := getResources(f)
+	if err != nil {
+		return 0
+	}
+
+	c := fake.NewFakeClientWithScheme(scheme, resources...)
+	r := &HelmReleaseReconciler{Client: c}
+
+	hr := v2.HelmRelease{}
+	err = f.GenerateStruct(&hr)
+	if err != nil {
+		return 0
+	}
+
+	_, _ = r.composeValues(logr.NewContext(context.TODO(), logr.Discard()), hr)
+
+	return 1
+}
+
+// FuzzHelmreleaseComposeValues implements a fuzzer
+// that targets HelmReleaseReconciler.reconcile().
+func FuzzHelmreleaseReconcile(data []byte) int {
+	doOnce.Do(initFunc)
+
+	f := fuzz.NewConsumer(data)
+
+	resources, err := getResources(f)
+	if err != nil {
+		return 0
+	}
+
+	hr := v2.HelmRelease{}
+	err = f.GenerateStruct(&hr)
+	if err != nil {
+		return 0
+	}
+
+	hc := sourcev1.HelmChart{}
+	err = f.GenerateStruct(&hc)
+	if err != nil {
+		return 0
+	}
+
+	hc.ObjectMeta.Name = hr.GetHelmChartName()
+	hc.ObjectMeta.Namespace = hr.Spec.Chart.GetNamespace(hr.Namespace)
+	resources = append(resources, &hc)
+
+	c := fake.NewFakeClientWithScheme(scheme, resources...)
+	r := &HelmReleaseReconciler{Client: c}
+
+	_, _, _ = r.reconcile(logr.NewContext(context.TODO(), logr.Discard()), hr)
+
+	return 1
+}
+
+func getResources(f *fuzz.ConsumeFuzzer) ([]runtime.Object, error) {
+	resources := make([]runtime.Object, 0)
+
+	name, err := f.GetString()
+	if err != nil {
+		return nil, err
+	}
+
+	if createSecret, _ := f.GetBool(); createSecret {
+		inputByte := make(map[string][]byte)
+		f.FuzzMap(&inputByte) // ignore error, as empty is still valid
+		resources = append(resources,
+			&corev1.Secret{
+				ObjectMeta: metav1.ObjectMeta{Name: name},
+				Data:       inputByte,
+			})
+	}
+
+	if createConfigMap, _ := f.GetBool(); createConfigMap {
+		inputString := make(map[string]string)
+		f.FuzzMap(&inputString) // ignore error, as empty is still valid
+		resources = append(resources,
+			&corev1.ConfigMap{
+				ObjectMeta: metav1.ObjectMeta{Name: name},
+				Data:       inputString,
+			})
+	}
+
+	return resources, nil
+}

tests/fuzz/go.mod

@@ -0,0 +1,5 @@
+module github.com/fluxcd/helm-controller/tests/fuzz
+// This module is used only to avoid polluting the main module
+// with fuzz dependencies.
+
+go 1.17

tests/fuzz/oss_fuzz_build.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+# Copyright 2022 The Flux 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.
+
+set -euxo pipefail
+
+GOPATH="${GOPATH:-/root/go}"
+GO_SRC="${GOPATH}/src"
+PROJECT_PATH="github.com/fluxcd/helm-controller"
+
+cd "${GO_SRC}"
+
+# Move fuzzer to their respective directories. 
+# This removes dependency noises from the modules' go.mod and go.sum files.
+cp "${PROJECT_PATH}/tests/fuzz/fuzz_controllers.go" "${PROJECT_PATH}/controllers/"
+
+
+# compile fuzz tests for the runtime module
+pushd "${PROJECT_PATH}"
+
+go mod tidy
+compile_go_fuzzer "${PROJECT_PATH}/controllers/" FuzzHelmreleaseComposeValues fuzz_helmrelease_composevalues
+compile_go_fuzzer "${PROJECT_PATH}/controllers/" FuzzHelmreleaseReconcile fuzz_helmrelease_reconcile
+
+popd

tests/fuzz/oss_fuzz_run.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+# Copyright 2022 The Flux 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.
+
+set -euxo pipefail
+
+# run each fuzzer once to ensure they are working properly
+find /out -type f -name "fuzz*" -exec echo {} -runs=1 \; | bash -e