Add function_filter fuzzer based on centipede (#1476)

* Add function_filter fuzzer based on centipede

* Reuse centipede integration

* fix lint

* use centipede's weak

.github/workflows/fuzzers.yml

@@ -107,6 +107,7 @@ jobs:
           - libfuzzer_focus_idx6
           - libfuzzer_focus_idx7
           - libfuzzer_focus_idx8
+          - centipede_function_filter
 
         benchmark_type:
           - oss-fuzz

fuzzers/centipede_function_filter/builder.Dockerfile

@@ -0,0 +1,31 @@
+# Copyright 2022 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.
+
+ARG parent_image
+FROM $parent_image
+
+ENV CENTIPEDE_SRC=/src/centipede
+
+# Build centipede.
+RUN git clone -n \
+    https://github.com/google/centipede.git "$CENTIPEDE_SRC" && \
+  echo 'build --client_env=CC=clang --cxxopt=-std=c++17 ' \
+    '--cxxopt=-stdlib=libc++ --linkopt=-lc++' >> ~/.bazelrc && \
+  (cd "$CENTIPEDE_SRC" && \
+    git checkout 2a2c78a2c161d99f5962b9710bce61feb00acc3d && \
+    ./install_dependencies_debian.sh && \
+    bazel build -c opt :all) && \
+  cp "$CENTIPEDE_SRC/bazel-bin/centipede" '/out/centipede'
+
+RUN /clang/bin/clang "$CENTIPEDE_SRC/weak_sancov_stubs.cc" -c -o /lib/weak.o

fuzzers/centipede_function_filter/fuzzer.py

@@ -0,0 +1,40 @@
+# Copyright 2022 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.
+"""Integration code for centipede fuzzer."""
+
+import os
+import yaml
+
+from fuzzers.centipede import fuzzer
+
+
+def build():
+    """Build benchmark."""
+    fuzzer.build()
+
+
+def fuzz(input_corpus, output_corpus, target_binary):
+    """Run fuzzer. Wrapper that uses the defaults when calling run_fuzzer."""
+    with open('/focus_map.yaml', 'r') as focus_file:
+        focus_map = yaml.safe_load(focus_file)
+    benchmark = os.getenv('BENCHMARK', None)
+    if benchmark not in focus_map:
+        return
+    focus_list = focus_map[benchmark]
+    focus_filter = ','.join(focus_list)
+    print("DEBUG: ", focus_filter)
+    fuzzer.run_fuzzer(input_corpus,
+                      output_corpus,
+                      target_binary,
+                      extra_flags=[f'--function_filter={focus_filter}'])

fuzzers/centipede_function_filter/runner.Dockerfile

@@ -0,0 +1,22 @@
+# Copyright 2022 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.
+
+FROM gcr.io/oss-fuzz-base/base-clang@sha256:30706816922bf9c141b15ff4a5a44af8c0ec5700d4b46e0572029c15e495d45b AS base-clang
+FROM gcr.io/fuzzbench/base-image
+
+RUN apt-get update && apt-get install -y wget && \
+    wget https://storage.googleapis.com/oss-fuzz-introspector-testing/focus_map.yaml && \
+    apt-get remove --purge -y wget
+
+COPY --from=base-clang /usr/local/bin/llvm-symbolizer /usr/local/bin/