Fuzzing: Initial commit

fuzz/Dockerfile

@@ -0,0 +1,29 @@
+FROM golang:1.16-buster as builder
+
+RUN apt-get update && apt-get install -y git vim clang
+RUN git clone https://github.com/fluxcd/kustomize-controller /kustomize-controller
+
+WORKDIR /kustomize-controller
+
+# fillippo.io/age v1.0.0-beta7 throws an error
+RUN sed 's/filippo.io\/age v1.0.0-beta7/filippo.io\/age v1.0.0/g' -i /kustomize-controller/go.mod
+RUN make download-crd-deps
+RUN mkdir /kustomize-controller/fuzz 
+COPY fuzz.go /kustomize-controller/controllers/
+
+RUN go mod tidy
+
+RUN cd / \
+	&&  go get -u github.com/dvyukov/go-fuzz/go-fuzz@latest github.com/dvyukov/go-fuzz/go-fuzz-build@latest
+RUN go install sigs.k8s.io/controller-runtime/tools/setup-envtest@latest
+RUN go get github.com/AdaLogics/go-fuzz-headers
+RUN go mod download golang.org/x/sync
+RUN go mod download github.com/dvyukov/go-fuzz
+
+RUN mkdir /fuzzers
+RUN cd /kustomize-controller/controllers \
+	&& go-fuzz-build -libfuzzer -func=Fuzz \
+	&& clang -o /fuzzers/Fuzz reflect-fuzz.a \
+	-fsanitize=fuzzer
+
+RUN cd /kustomize-controller/controllers && /fuzzers/Fuzz