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fuzzing: add two new fuzzers to OSS-Fuzz setup #799

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fuzzing: add two new fuzzers to OSS-Fuzz setup #799

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164 changes: 164 additions & 0 deletions fuzzing/cjson_extended_fuzzer.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,164 @@
#include <fuzzer/FuzzedDataProvider.h>
#include <string>

extern "C" {
#include "../cJSON.c"
}

int intArray[10];
float floatArray[10];
double doubleArray[10];
const char *stringArray[10];

extern "C" int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
FuzzedDataProvider fdp(data, size);

std::string json_string = fdp.ConsumeRandomLengthString();
cJSON *json = cJSON_ParseWithOpts(json_string.c_str(), NULL, fdp.ConsumeBool());

if (json != NULL) {

cJSON *new_json = cJSON_Duplicate(json, fdp.ConsumeBool());
if (new_json != NULL) {
cJSON_Delete(new_json);
}

// Modifify the object
int opsToPerform = fdp.ConsumeIntegralInRange(5, 20);
for (int i = 0; i < opsToPerform; i++) {
int op = fdp.ConsumeIntegralInRange(0, 13);
switch (op) {
case 0:
cJSON_AddBoolToObject(json, fdp.ConsumeRandomLengthString().c_str(), fdp.ConsumeBool());
break;
case 1:
cJSON_AddTrueToObject(json, fdp.ConsumeRandomLengthString().c_str());
break;
case 2:
cJSON_AddNumberToObject(json, fdp.ConsumeRandomLengthString().c_str(), 1.0);
break;
case 3:
cJSON_GetObjectItem(json, fdp.ConsumeRandomLengthString().c_str());
break;
case 4:
cJSON_GetObjectItemCaseSensitive(json, fdp.ConsumeRandomLengthString().c_str());
break;
case 5:
cJSON_AddNullToObject(json, fdp.ConsumeRandomLengthString().c_str());
break;
case 6:
cJSON_AddStringToObject(json, fdp.ConsumeRandomLengthString().c_str(), fdp.ConsumeRandomLengthString().c_str());
break;
case 7:
cJSON_AddRawToObject(json, fdp.ConsumeRandomLengthString().c_str(), fdp.ConsumeRandomLengthString().c_str());
break;
case 8:
cJSON_AddArrayToObject(json, fdp.ConsumeRandomLengthString().c_str());
break;
case 9:
cJSON_AddFalseToObject(json, fdp.ConsumeRandomLengthString().c_str());
break;
case 10:
cJSON_AddObjectToObject(json, fdp.ConsumeRandomLengthString().c_str());
break;
case 11:
cJSON_SetNumberHelper(json, fdp.ConsumeFloatingPoint<double>());
break;
case 12:
cJSON_SetValuestring(json, fdp.ConsumeRandomLengthString().c_str());
break;
default:
break;
}
}

// Array creation routines.
for (int i = 0; i < 10; i++) {
intArray[i] = fdp.ConsumeIntegral<int>();
floatArray[i] = fdp.ConsumeFloatingPoint<float>();
doubleArray[i] = fdp.ConsumeFloatingPoint<double>();
stringArray[i] = json_string.c_str();
}
cJSON *cJsonIntArray = cJSON_CreateIntArray(intArray, 10);
if (cJsonIntArray != NULL) {
cJSON_Delete(cJsonIntArray);
}
cJSON *floatIntArray = cJSON_CreateFloatArray(floatArray, 10);
if (floatIntArray != NULL) {
cJSON_Delete(floatIntArray);
}
cJSON *cJsonDoubleArray = cJSON_CreateDoubleArray(doubleArray, 10);
if (cJsonDoubleArray != NULL) {
cJSON_Delete(cJsonDoubleArray);
}
cJSON *cJsonStringArray = cJSON_CreateStringArray(stringArray, 10);
if (cJsonStringArray != NULL) {
cJSON_Delete(cJsonStringArray);
}

// Replace
cJSON *nullObj = cJSON_CreateNull();
if (nullObj != NULL) {
if (cJSON_ReplaceItemInObject(json, fdp.ConsumeRandomLengthString().c_str(), nullObj) == false) {
cJSON_Delete(nullObj);
}
}
// Print the object
unsigned char printed_unformatted[1024];
unsigned char printed_formatted[1024];
printbuffer unformatted_buffer = { 0, 0, 0, 0, 0, 0, { 0, 0, 0 } };

/* buffer for formatted printing */
unformatted_buffer.buffer = printed_unformatted;
unformatted_buffer.length = sizeof(printed_unformatted);
unformatted_buffer.offset = 0;
unformatted_buffer.noalloc = true;
unformatted_buffer.hooks = global_hooks;
print_object(json, &unformatted_buffer);

// Type checks
opsToPerform = fdp.ConsumeIntegralInRange(5, 20);
for (int i = 0; i < opsToPerform; i++) {
int op = fdp.ConsumeIntegralInRange(0, 9);
switch (op) {
case 0:
if (cJSON_IsArray(json)) {
cJSON_GetArraySize(json);
cJSON_GetArrayItem(json, 10);
}
break;
case 1:
cJSON_IsObject(json);
break;
case 2:
cJSON_IsString(json);
break;
case 3:
cJSON_IsRaw(json);
break;
case 4:
cJSON_IsNull(json);
break;
case 5:
cJSON_IsBool(json);
break;
case 6:
cJSON_IsTrue(json);
break;
case 7:
cJSON_IsFalse(json);
break;
case 8:
cJSON_IsInvalid(json);
break;
default:
break;
}
}
}

cJSON_Delete(json);
return 0;
}
33 changes: 33 additions & 0 deletions fuzzing/cjson_read_compare.cpp
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#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <fuzzer/FuzzedDataProvider.h>

extern "C" {
#include "../cJSON.h"
}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
cJSON *a_json, *b_json;
FuzzedDataProvider fdp(data, size);

std::string payload1 = fdp.ConsumeRandomLengthString();
std::string payload2 = fdp.ConsumeRandomLengthString();

a_json = cJSON_ParseWithOpts(payload1.c_str(), NULL, 1);
b_json = cJSON_ParseWithOpts(payload2.c_str(), NULL, 1);

if(a_json != NULL && b_json != NULL) {
cJSON_Compare(a_json, b_json, fdp.ConsumeBool());
}

if (a_json != NULL) {
cJSON_Delete(a_json);
}
if (b_json != NULL) {
cJSON_Delete(b_json);
}

return 0;
}
8 changes: 8 additions & 0 deletions fuzzing/ossfuzz.sh
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Expand Up @@ -12,6 +12,14 @@ $CXX $CXXFLAGS $SRC/cjson/fuzzing/cjson_read_fuzzer.c -I. \
-o $OUT/cjson_read_fuzzer \
$LIB_FUZZING_ENGINE $SRC/cjson/build/libcjson.a

$CXX $CXXFLAGS $SRC/cjson/fuzzing/cjson_read_compare.cpp -I. \
-o $OUT/cjson_read_compare \
$LIB_FUZZING_ENGINE $SRC/cjson/build/libcjson.a

$CXX $CXXFLAGS $SRC/cjson/fuzzing/cjson_extended_fuzzer.cpp -I. \
-o $OUT/cjson_extended_fuzzer \
$LIB_FUZZING_ENGINE $SRC/cjson/build/libcjson.a

find $SRC/cjson/fuzzing/inputs -name "*" | \
xargs zip $OUT/cjson_read_fuzzer_seed_corpus.zip

Expand Down