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Modified fuzz.cpp and Added a dict #994

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Modified fuzz.cpp and Added a dict #994

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f7edafe
Modify fuzzer for OSS-Fuzz
Google-Autofuzz Jul 30, 2019
f561b89
Update fuzz.cpp
Google-Autofuzz Jul 30, 2019
3362035
got rid of decapracated
Google-Autofuzz Jul 30, 2019
6ad1612
Update fuzz.cpp
Google-Autofuzz Jul 30, 2019
8f67878
Create fuzz.dict
Google-Autofuzz Jul 30, 2019
d3121d7
Get rid of unnecessary comments
Google-Autofuzz Jul 30, 2019
0c23fa5
Update fuzz.cpp
Google-Autofuzz Aug 1, 2019
a457fa9
Update fuzz.cpp
Google-Autofuzz Aug 27, 2019
716be0f
Add link
Google-Autofuzz Aug 27, 2019
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58 changes: 21 additions & 37 deletions src/test_lib_json/fuzz.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3,47 +3,31 @@
// recognized in your jurisdiction.
// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE

#include "fuzz.h"

#include <cstdint>
#include <json/config.h>
#include <json/json.h>
#include <memory>
#include <stdint.h>
#include <sstream>
#include <string>

namespace Json {
class Exception;
}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
Json::CharReaderBuilder builder;

if (size < sizeof(uint32_t)) {
#include "fuzz.h"
#include "json/config.h"
#include "json/features.h"
#include "json/reader.h"
#include "json/value.h"
#include "json/writer.h"
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we can use #include "json/json.h" instead of "json/features.h", "json/reader.h", "json/value.h", "json/writer.h"


extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
const std::string json_string(reinterpret_cast<const char *>(data), size);
Json::Reader reader(Json::Features::strictMode());
Json::Value value;
const bool success = reader.parse(json_string, value, false);
if (!success) {
return 0;
}

uint32_t hash_settings = *(const uint32_t*)data;
data += sizeof(uint32_t);

builder.settings_["failIfExtra"] = hash_settings & (1 << 0);
builder.settings_["allowComments_"] = hash_settings & (1 << 1);
builder.settings_["strictRoot_"] = hash_settings & (1 << 2);
builder.settings_["allowDroppedNullPlaceholders_"] = hash_settings & (1 << 3);
builder.settings_["allowNumericKeys_"] = hash_settings & (1 << 4);
builder.settings_["allowSingleQuotes_"] = hash_settings & (1 << 5);
builder.settings_["failIfExtra_"] = hash_settings & (1 << 6);
builder.settings_["rejectDupKeys_"] = hash_settings & (1 << 7);
builder.settings_["allowSpecialFloats_"] = hash_settings & (1 << 8);
// Write with StyledWriter
Json::StyledWriter styled_writer;
styled_writer.write(value);

std::unique_ptr<Json::CharReader> reader(builder.newCharReader());

Json::Value root;
const char* data_str = reinterpret_cast<const char*>(data);
try {
reader->parse(data_str, data_str + size, &root, nullptr);
} catch (Json::Exception const&) {
}
// Whether it succeeded or not doesn't matter.
// Write with StyledStreamWriter
Json::StyledStreamWriter styled_stream_writer;
JSONCPP_OSTRINGSTREAM sstream;
styled_stream_writer.write(sstream, value);
return 0;
}
54 changes: 54 additions & 0 deletions src/test_lib_json/fuzz.dict
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Original file line number Diff line number Diff line change
@@ -0,0 +1,54 @@
#
# AFL dictionary for JSON
# -----------------------
#
# Just the very basics.
#
# Inspired by a dictionary by Jakub Wilk <jwilk@jwilk.net>
#
# https://github.com/rc0r/afl-fuzz/blob/master/dictionaries/json.dict
#

"0"
",0"
":0"
"0:"
"-1.2e+3"

"true"
"false"
"null"

"\"\""
",\"\""
":\"\""
"\"\":"

"{}"
",{}"
":{}"
"{\"\":0}"
"{{}}"

"[]"
",[]"
":[]"
"[0]"
"[[]]"

"''"
"\\"
"\\b"
"\\f"
"\\n"
"\\r"
"\\t"
"\\u0000"
"\\x00"
"\\0"
"\\uD800\\uDC00"
"\\uDBFF\\uDFFF"

"\"\":0"
"//"
"/**/"