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Simple fuzzer for nlohmann/json library #27

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Oct 13, 2016
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21 changes: 21 additions & 0 deletions json/Dockerfile
Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
# Copyright 2016 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 ossfuzz/base-libfuzzer
MAINTAINER vitalybuka@gmail.com
RUN apt-get install -y binutils gcc

COPY build.sh /src/
22 changes: 22 additions & 0 deletions json/Jenkinsfile
Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
// Copyright 2016 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.
//
////////////////////////////////////////////////////////////////////////////////

def libfuzzerBuild = fileLoader.fromGit('infra/libfuzzer-pipeline.groovy',
'https://github.com/google/oss-fuzz.git')

libfuzzerBuild {
git = "https://github.com/nlohmann/json.git"
}
22 changes: 22 additions & 0 deletions json/build.sh
Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
#!/bin/bash -eu
# Copyright 2016 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.
#
################################################################################

cd /src/json

$CXX $CXXFLAGS -std=c++11 -I/src/json/src/ \
/src/oss-fuzz/json/parse_fuzzer.cc -o /out/parse_fuzzer \
/work/libfuzzer/*.o $LDFLAGS
3 changes: 3 additions & 0 deletions json/json.options
Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
[libfuzzer]
max_len = 456
timeout = 10
36 changes: 36 additions & 0 deletions json/parse_fuzzer.cc
Original file line number Diff line number Diff line change
@@ -0,0 +1,36 @@
// Copyright 2016 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.

#include <iostream>
#include <sstream>
#include <json.hpp>

using json = nlohmann::json;

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
try {
std::stringstream s;
s << json::parse(data, data + size);
try {
auto j = json::parse(s.str());
std::stringstream s2;
s2 << j;
assert(s.str() == s2.str());
assert(j == json::parse(s.str()));
} catch (const std::invalid_argument&) {
assert(0);
}
} catch (const std::invalid_argument&) { }
return 0;
}
2 changes: 1 addition & 1 deletion scripts/helper.py
Original file line number Diff line number Diff line change
Expand Up @@ -202,7 +202,7 @@ def build_fuzzers(build_args):

def run_fuzzer(run_args):
"""Runs a fuzzer in the container."""
parser = argparse.ArgumentParser('helper.py build_fuzzers')
parser = argparse.ArgumentParser('helper.py run_fuzzer')
parser.add_argument('library_name', help='name of the library')
parser.add_argument('fuzzer_name', help='name of the fuzzer')
parser.add_argument('fuzzer_args', help='arguments to pass to the fuzzer',
Expand Down