Fuzzing: Initial set up

fuzzing/Dockerfile

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+FROM golang:1.16-buster as builder
+
+RUN echo "deb http://deb.debian.org/debian unstable main" >> /etc/apt/sources.list \
+    && echo "deb-src http://deb.debian.org/debian unstable main" >> /etc/apt/sources.list
+RUN set -eux; \
+    apt-get update \
+    && apt-get install -y \
+        libgit2-dev/unstable \
+        zlib1g-dev/unstable \
+        libssh2-1-dev/unstable \
+        libpcre3-dev/unstable \
+    clang \
+    curl \
+    cmake \
+    vim \
+    zlib1g-dev \
+    && apt-get clean \
+    && apt-get autoremove --purge -y \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN git clone https://github.com/fluxcd/source-controller /workspace
+WORKDIR /workspace
+
+# BUILD STATIC DEPENDENCIES TO LINK WITH OUR FUZZER:
+
+# Make dir for .a files
+RUN mkdir /static_a_files
+
+# Build libgit2
+ARG LIBGIT2_VER=1.1.0
+RUN curl -L https://github.com/libgit2/libgit2/releases/download/v$LIBGIT2_VER/libgit2-$LIBGIT2_VER.tar.gz -o /tmp/libgit2.tar.gz \
+    && cd /tmp \
+    && tar -xvf /tmp/libgit2.tar.gz \
+    && cd libgit2-1.1.0 \
+    && mkdir build && cd build \
+    && cmake .. -DBUILD_SHARED_LIBS=OFF \
+    && make \
+    && mv libgit2.a /static_a_files/
+
+# Build openssl
+ARG OPENSSL_VERSION=1.1.1g
+ARG OPENSSL_HASH=ddb04774f1e32f0c49751e21b67216ac87852ceb056b75209af2443400636d46
+RUN set -ex \
+    && curl -s -O https://www.openssl.org/source/openssl-${OPENSSL_VERSION}.tar.gz \
+    && echo "${OPENSSL_HASH}  openssl-${OPENSSL_VERSION}.tar.gz" | sha256sum -c \
+    && tar -xzf openssl-${OPENSSL_VERSION}.tar.gz \
+    && cd openssl-${OPENSSL_VERSION} \
+    && ./Configure linux-x86_64 no-shared --static \
+    && make \
+    && mv libcrypto.a /static_a_files/ \
+    && mv libssl.a /static_a_files/
+
+# Build libssh2
+RUN git clone https://github.com/libssh2/libssh2 \
+    && cd libssh2 \
+    && mkdir build \
+    && cd build \
+    && cmake .. -DBUILD_SHARED_LIBS=OFF \
+    && make \
+    && mv ./src/libssh2.a /static_a_files/
+
+COPY fuzz.go /workspace/controllers/
+RUN go mod download
+
+RUN 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
+# A few fixes, see: https://github.com/dvyukov/go-fuzz/issues/325
+RUN sed -i '23 a type X = fs.FileInfo\n' /go/pkg/mod/k8s.io/client-go@v0.21.3/util/homedir/homedir.go
+RUN sed -i '22 a "io/fs" \n' /go/pkg/mod/k8s.io/client-go@v0.21.3/util/homedir/homedir.go
+
+
+RUN mkdir /fuzzers
+RUN cd /workspace && rm -r hack && rm -r docs \
+    && go mod download \
+    && go mod tidy \
+    && go get github.com/dvyukov/go-fuzz/go-fuzz-dep
+
+
+# Build the fuzzers
+RUN cd /workspace/controllers \
+    && go-fuzz-build -libfuzzer -func=FuzzStorageArchive\
+    && clang -o /fuzzers/FuzzStorageArchive reflect-fuzz.a \
+        /static_a_files/libgit2.a \
+        /static_a_files/libssh2.a \
+        /static_a_files/libssl.a \
+        /static_a_files/libcrypto.a \
+        -lz -lpcre -fsanitize=fuzzer
+
+RUN cd /workspace/controllers \
+    && go-fuzz-build -libfuzzer -func=FuzzStorageCopy\
+    && clang -o /fuzzers/FuzzStorageCopy \
+        reflect-fuzz.a \
+        /static_a_files/libgit2.a \
+        /static_a_files/libssh2.a \
+        /static_a_files/libssl.a \
+        /static_a_files/libcrypto.a \
+        -lz -lpcre -fsanitize=fuzzer
+
+RUN cd /workspace/controllers \
+    && go-fuzz-build -libfuzzer -func=FuzzRandomGitFiles\
+    && clang -o /fuzzers/FuzzRandomGitFiles \
+        reflect-fuzz.a \
+        /static_a_files/libgit2.a \
+        /static_a_files/libssh2.a \
+        /static_a_files/libssl.a \
+        /static_a_files/libcrypto.a \
+        -lz -lpcre -fsanitize=fuzzer
+
+RUN cd /workspace/controllers \
+    && go-fuzz-build -libfuzzer -func=FuzzGitResourceObject\
+    && clang -o /fuzzers/FuzzGitResourceObject \
+        reflect-fuzz.a \
+        /static_a_files/libgit2.a \
+        /static_a_files/libssh2.a \
+        /static_a_files/libssl.a \
+        /static_a_files/libcrypto.a \
+        -lz -lpcre -fsanitize=fuzzer
+
+RUN cd /workspace/controllers \
+    && go-fuzz-build -libfuzzer -func=FuzzHelmchartController\
+    && clang -o /fuzzers/FuzzHelmchartController \
+        reflect-fuzz.a \
+        /static_a_files/libgit2.a \
+        /static_a_files/libssh2.a \
+        /static_a_files/libssl.a \
+        /static_a_files/libcrypto.a \
+        -lz -lpcre -fsanitize=fuzzer
+
+
+# The fuzzers can now be executed from /fuzzers/fuzzer_name.
+# Uncomment below to run:
+#RUN cd controllers && /fuzzers/FuzzRandomGitFiles