[jsonnet] Integrate jsonnet and add a fuzzer (#2045)

* Add jsonnet

* Update build.sh

* Update build.sh

* Update build file

* Update build.sh

* Update build.sh

* Made it workgit status

* Add more sanitizer configs

* Minor update

* Remove emacs

projects/jsonnet/Dockerfile

@@ -0,0 +1,23 @@
+# Copyright 2018 Google Inc.
+#
+# 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-builder
+RUN apt-get update && apt-get install -y build-essential cmake
+RUN git clone --depth 1 https://github.com/google/jsonnet.git jsonnet
+WORKDIR $SRC/
+
+COPY build.sh $SRC/
+COPY *.cc $SRC/

projects/jsonnet/build.sh

@@ -0,0 +1,31 @@
+#!/bin/bash -eu
+# Copyright 2018 Google Inc.
+#
+# 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.
+#
+################################################################################
+
+mkdir jsonnet/build
+pushd jsonnet/build
+cmake -DCMAKE_C_COMPILER="$CC" -DCMAKE_CXX_COMPILER="$CXX" \
+  -DCMAKE_C_FLAGS="$CFLAGS" -DCMAKE_CXX_FLAGS="$CXXFLAGS" ..
+make -j$(nproc)
+popd
+
+INSTALL_DIR="$SRC/jsonnet"
+
+fuzzer=convert_jsonnet_fuzzer
+$CXX $CXXFLAGS -I${INSTALL_DIR}/include -lFuzzingEngine \
+  $fuzzer.cc -o $OUT/$fuzzer \
+  ${INSTALL_DIR}/build/libjsonnet.a \
+  ${INSTALL_DIR}/build/libmd5.a

projects/jsonnet/convert_jsonnet_fuzzer.cc

@@ -0,0 +1,42 @@
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <string>
+
+extern "C" {
+#include "libjsonnet.h"
+}
+
+char* ImportCallback(void* ctx, const char* base, const char* rel,
+                     char** found_here, int* success) {
+  // Don't load file and mark it as failure.
+  *success = 0;
+  char* res = jsonnet_realloc(static_cast<struct JsonnetVm*>(ctx), nullptr, 1);
+  res[0] = 0;
+  return res;
+}
+
+std::string ConvertJsonnetToJson(const std::string& jsonnet) {
+  JsonnetVm* jvm = jsonnet_make();
+  jsonnet_import_callback(jvm, ImportCallback, jvm);
+  int error = 0;
+  char* res =
+      jsonnet_evaluate_snippet(jvm, /*filename=*/"", jsonnet.c_str(), &error);
+
+  std::string json;
+  if (error == 0 && res != nullptr) {
+    json = res;
+  }
+
+  if (res) {
+    jsonnet_realloc(jvm, res, 0);
+  }
+  jsonnet_destroy(jvm);
+  return json;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  std::string fuzz_jsonnet(reinterpret_cast<const char*>(data), size);
+  ConvertJsonnetToJson(fuzz_jsonnet);
+  return 0;
+}

projects/jsonnet/project.yaml

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+homepage: "https://github.com/google/jsonnet"
+primary_contact: "dcunnin@google.com"
+auto_ccs:
+  - "wwweiwang@google.com"
+
+experimental: True
+
+sanitizers:
+  - address
+  - memory
+  - undefined
+
+labels:
+  convert_jsonnet_fuzzer:
+    - sundew