Enable fuzz testing of Rust code for project Oak

projects/oak/Dockerfile

@@ -14,26 +14,9 @@
 #
 ################################################################################
 
-# TODO(https://github.com/google/oss-fuzz/issues/3093): Stop specifying the
-# image SHA once the bug is fixed.
-FROM gcr.io/oss-fuzz-base/base-builder@sha256:276813aef0ce5972db43c0230f96162003994fa742fb1b2f4e66c67498575c65
-
-# Use a fixed Bazel version.
-# https://github.com/google/asylo/blob/088ea3490dd4579655bd5b65b0e31fe18de7f6dd/asylo/distrib/toolchain/Dockerfile#L48-L71
-ARG bazel_version=1.1.0
-ARG bazel_sha=138b47ffd54924e3c0264c65d31d3927803fb9025db4d5b18107df79ee3bda95
-ARG bazel_url=https://storage.googleapis.com/bazel-apt/pool/jdk1.8/b/bazel/bazel_${bazel_version}_amd64.deb
-
-# Install Bazel.
-RUN apt-get update && \
-    apt-get install -y wget && \
-    wget "${bazel_url}" -nv -o- -O bazel.deb && \
-    echo "${bazel_sha}  bazel.deb" > bazel.sha256 && \
-    sha256sum --check bazel.sha256 && \
-    apt-get install -y ./bazel.deb && \
-    rm bazel.deb bazel.sha256 && \
-    apt-get clean
+FROM gcr.io/oss-fuzz-base/base-builder
 
 RUN git clone --depth 1 https://github.com/project-oak/oak oak
 WORKDIR oak
 COPY build.sh $SRC/
+COPY rustc.py $SRC/

projects/oak/build.sh

@@ -15,62 +15,21 @@
 #
 ################################################################################
 
-# Mostly copied from
-# https://github.com/google/oss-fuzz/blob/7f8013db108e62727fba1c3cbcccac07d543682b/projects/grpc/build.sh
+cd oak_functions/loader/
 
-# Copy $CFLAGS and $CXXFLAGS into Bazel command-line flags, for both
-# compilation and linking.
-#
-# Some flags, such as `-stdlib=libc++`, generate warnings if used on a C source
-# file. Since the build runs with `-Werror` this will cause it to break, so we
-# use `--conlyopt` and `--cxxopt` instead of `--copt`.
-readonly EXTRA_BAZEL_FLAGS="$(
-for f in ${CFLAGS}; do
-  echo "--conlyopt=${f}" "--linkopt=${f}"
-done
-for f in ${CXXFLAGS}; do
-  echo "--cxxopt=${f}" "--linkopt=${f}"
-done
-if [ "${SANITIZER}" = "undefined" ]
+if [ "$SANITIZER" = "coverage" ]
 then
-  # Bazel uses clang to link binary, which does not link clang_rt ubsan library for C++ automatically.
-  # See issue: https://github.com/bazelbuild/bazel/issues/8777
-  echo "--linkopt=$(find $(llvm-config --libdir) -name libclang_rt.ubsan_standalone_cxx-x86_64.a | head -1)"
+  export RUSTFLAGS="$RUSTFLAGS -C debug-assertions=no"
+  chmod +x $SRC/rustc.py
+  export RUSTC="$SRC/rustc.py"
 fi
-)"
-
-# Temporary hack, see https://github.com/google/oss-fuzz/issues/383
-readonly NO_VPTR='--copt=-fno-sanitize=vptr --linkopt=-fno-sanitize=vptr'
 
-readonly FUZZER_TARGETS=()
-readonly ENABLED=false
+cargo fuzz build -O
 
-if [ "$ENABLED" = true ]; then
-  bazel build \
-    --client_env=CC=${CC} \
-    --client_env=CXX=${CXX} \
-    --dynamic_mode=off \
-    --spawn_strategy=standalone \
-    --genrule_strategy=standalone \
-    ${NO_VPTR} \
-    --strip=never \
-    --linkopt=-lc++ \
-    --linkopt=-pthread \
-    --cxxopt=-std=c++11 \
-    --copt=${LIB_FUZZING_ENGINE} \
-    --linkopt=${LIB_FUZZING_ENGINE} \
-    --remote_cache=https://storage.googleapis.com/oak-bazel-cache \
-    --remote_upload_local_results=false \
-    ${EXTRA_BAZEL_FLAGS} \
-    ${FUZZER_TARGETS[@]}
-
-  for target in ${FUZZER_TARGETS}; do
-    # Replace : with /.
-    fuzzer_name="${target/:/\/}"
-    cp "./bazel-bin/${fuzzer_name}" "${OUT}/"
-  done
+FUZZ_TARGET_OUTPUT_DIR=fuzz/target/x86_64-unknown-linux-gnu/release
+for f in fuzz/fuzz_targets/*.rs
+do
+    FUZZ_TARGET_NAME=$(basename ${f%.*})
+    cp $FUZZ_TARGET_OUTPUT_DIR/$FUZZ_TARGET_NAME $OUT/
+done
 
-  # Cleanup bazel- symlinks to avoid oss-fuzz trying to copy out of the build
-  # cache.
-  rm -f ./bazel-*
-fi

projects/oak/project.yaml

@@ -1,15 +1,15 @@
-disabled: True
 homepage: "https://github.com/project-oak/oak"
-language: c++
+language: rust
 primary_contact: "tzn@google.com"
 auto_ccs:
   - "project-oak-team@google.com"
   - "benblaxill@google.com"
-  - "drysdale@google.com"
   - "grobler@google.com"
   - "iovi@google.com"
   - "ivanpetrov@google.com"
-  - "mks@google.com"
+  - "razieh@google.com"
+sanitizers:
+  - address
 fuzzing_engines:
   - libfuzzer
 main_repo: 'https://github.com/project-oak/oak'

projects/oak/rustc.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+
+# Copyright 2021 Google LLC
+#
+# 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.
+
+import sys
+import subprocess
+
+#Disable coverage for troubling crates.
+sys.argv[0] = "rustc"
+if "tokio_util" in sys.argv or "hyper" in sys.argv:
+    try:
+        sys.argv.remove("-Zinstrument-coverage")
+    except:
+        pass
+    print(sys.argv)
+subprocess.call(sys.argv)