Lagom/Fuzzers: Add a Dockerfile for FuzzilliJs

Based on Fedora. This allows building and running FuzzilliJs and Fuzzilli
itself in a Docker/Podman container.

Meta/Lagom/Fuzzers/FuzzilliJs.dockerfile

@@ -0,0 +1,71 @@
+# Build the image:
+# $ podman build \
+#       --tag fuzzillijs \
+#       -f ./FuzzilliJs.dockerfile
+# Run the container:
+# $ podman run \
+#       -it --rm \
+#       -v ./path/to/fuzzilli-storage:/home/fuzzilli-storage:Z \
+#       localhost/fuzzillijs
+# To pass more options to fuzzilli, e.g. '--resume' (use '--help' to see all options):
+# $ podman run \
+#       -it --rm \
+#       -v ./path/to/fuzzilli-storage:/home/fuzzilli-storage:Z \
+#       -e FUZZILLI_CLI_OPTIONS='--resume' \
+#       localhost/fuzzillijs
+# Invocations with `docker` should be similar or even identical.
+# NB: There are Dockerfiles & build scripts available for Fuzzilli-supported JS engines,
+# but this doesn't use the same approach - that would require a fair amount of patching
+# which is not worth it, unless we plan to add LibJS support to Fuzzilli upstream.
+
+FROM fedora:33 AS serenity-build
+
+WORKDIR /home
+RUN dnf install -y clang cmake git-core ninja-build
+RUN git clone --depth=1 https://github.com/SerenityOS/serenity
+RUN mkdir /home/serenity/Build
+
+WORKDIR /home/serenity/Build
+RUN sed -i 's/-Wmissing-declarations //' ../CMakeLists.txt
+
+# In file included from ../Libraries/LibGfx/Font.cpp:37:
+# ../Libraries/LibCore/FileStream.h:96:5: error: explicitly defaulted default constructor is implicitly deleted [-Werror,-Wdefaulted-function-deleted]
+#     InputFileStream() = default;
+#     ^
+# -------------------------------------------------------------------
+# I have no idea how to fix this, so I'll allow it. It's not relevant
+# as LibJS doesn't use LibGfx; but I suppose Lagom builds it anyway.
+# ¯\_(ツ)_/¯
+RUN CXXFLAGS="-Wno-defaulted-function-deleted" \
+    cmake -GNinja \
+          -DBUILD_LAGOM=ON \
+          -DENABLE_FUZZER_SANITIZER=ON \
+          -DCMAKE_C_COMPILER=clang \
+          -DCMAKE_CXX_COMPILER=clang++ \
+          ..
+RUN ninja FuzzilliJs
+
+
+FROM fedora:33 AS fuzzilli-build
+
+WORKDIR /home
+RUN dnf install -y git-core patch swift-lang
+RUN git clone --depth=1 https://github.com/googleprojectzero/fuzzilli
+
+WORKDIR /home/fuzzilli
+COPY --from=serenity-build /home/serenity/Meta/Lagom/Fuzzers/add-serenity-support-to-fuzzilli.patch .
+RUN patch -p1 < add-serenity-support-to-fuzzilli.patch
+RUN swift build -c release
+
+
+FROM fedora:33
+
+WORKDIR /home
+# This is unfortunate, but we need libswiftCore.so (and possibly other files) from the
+# Swift runtime. The "swift-lang-runtime" package doesn't seem to exist in Fedora 33 :/
+RUN dnf install -y swift-lang
+COPY --from=serenity-build /home/serenity/Build/Meta/Lagom/Fuzzers/FuzzilliJs .
+COPY --from=fuzzilli-build /home/fuzzilli/.build/x86_64-unknown-linux-gnu/release/FuzzilliCli .
+RUN mkdir fuzzilli-storage
+ENV FUZZILLI_CLI_OPTIONS ""
+CMD [ "sh", "-c", "./FuzzilliCli --profile=serenity --storagePath=fuzzilli-storage ${FUZZILLI_CLI_OPTIONS} ./FuzzilliJs" ]

Meta/Lagom/Fuzzers/FuzzilliJsInstructions.md

@@ -6,3 +6,5 @@
 4. Apply the add-serenity-support-to-fuzzilli.patch patch file to the Fuzzilli root directory. ```patch -p1 < /path/to/add-serenity-support-to-fuzzilli.patch```
 5. Build Fuzzilli with ```swift build -c release```
 6. Run Fuzzilli with ```swift run -c release FuzzilliCli --profile=serenity /path/to/FuzzilliJs```. See ```swift run FuzzilliCli --help``` for options.
+
+Alternatively you can use `FuzzilliJs.dockerfile` to build & run Fuzzilli and FuzzilliJs with Docker or Podman.