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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Fuzz.h"
#include "SkCanvas.h"
#include "SkCodec.h"
#include "SkCommandLineFlags.h"
#include "SkData.h"
#include "SkForceLinking.h"
#include "SkImage.h"
#include "SkImageEncoder.h"
#include "SkMallocPixelRef.h"
#include "SkPicture.h"
#include "SkStream.h"
#include <signal.h>
#include <stdlib.h>
__SK_FORCE_IMAGE_DECODER_LINKING;
DEFINE_string2(bytes, b, "", "A path to a file. This can be the fuzz bytes or a binary to parse.");
DEFINE_string2(name, n, "", "If --type is 'api', fuzz the API with this name.");
DEFINE_string2(type, t, "api", "How to interpret --bytes, either 'image', 'skp', or 'api'.");
DEFINE_string2(dump, d, "", "If not empty, dump 'image' or 'skp' types as a PNG with this name.");
static int printUsage(const char* name) {
SkDebugf("Usage: %s -t <type> -b <path/to/file> [-n api-to-fuzz]\n", name);
return 1;
}
static int fuzz_api(SkData*);
static int fuzz_img(SkData*);
static int fuzz_skp(SkData*);
int main(int argc, char** argv) {
SkCommandLineFlags::Parse(argc, argv);
const char* path = FLAGS_bytes.isEmpty() ? argv[0] : FLAGS_bytes[0];
SkAutoTUnref<SkData> bytes(SkData::NewFromFileName(path));
if (!bytes) {
SkDebugf("Could not read %s\n", path);
return 2;
}
if (!FLAGS_type.isEmpty()) {
switch (FLAGS_type[0][0]) {
case 'a': return fuzz_api(bytes);
case 'i': return fuzz_img(bytes);
case 's': return fuzz_skp(bytes);
}
}
return printUsage(argv[0]);
}
int fuzz_api(SkData* bytes) {
const char* name = FLAGS_name.isEmpty() ? "" : FLAGS_name[0];
for (auto r = SkTRegistry<Fuzzable>::Head(); r; r = r->next()) {
auto fuzzable = r->factory();
if (0 == strcmp(name, fuzzable.name)) {
SkDebugf("Fuzzing %s...\n", fuzzable.name);
Fuzz fuzz(bytes);
fuzzable.fn(&fuzz);
return 0;
}
}
SkDebugf("When using --type api, please choose an API to fuzz with --name/-n:\n");
for (auto r = SkTRegistry<Fuzzable>::Head(); r; r = r->next()) {
auto fuzzable = r->factory();
SkDebugf("\t%s\n", fuzzable.name);
}
return 1;
}
static void dump_png(SkBitmap bitmap) {
if (!FLAGS_dump.isEmpty()) {
SkImageEncoder::EncodeFile(FLAGS_dump[0], bitmap, SkImageEncoder::kPNG_Type, 100);
SkDebugf("Dumped to %s\n", FLAGS_dump[0]);
}
}
int fuzz_img(SkData* bytes) {
SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(bytes));
if (nullptr == codec.get()) {
SkDebugf("Couldn't create codec.");
return 3;
}
SkImageInfo decodeInfo = codec->getInfo();
// Construct a color table for the decode if necessary
SkAutoTUnref<SkColorTable> colorTable(nullptr);
SkPMColor* colorPtr = nullptr;
int* colorCountPtr = nullptr;
int maxColors = 256;
if (kIndex_8_SkColorType == decodeInfo.colorType()) {
SkPMColor colors[256];
colorTable.reset(new SkColorTable(colors, maxColors));
colorPtr = const_cast<SkPMColor*>(colorTable->readColors());
colorCountPtr = &maxColors;
}
SkBitmap bitmap;
SkMallocPixelRef::ZeroedPRFactory zeroFactory;
SkCodec::Options options;
options.fZeroInitialized = SkCodec::kYes_ZeroInitialized;
if (!bitmap.tryAllocPixels(decodeInfo, &zeroFactory, nullptr)) {
SkDebugf("Could not allocate memory. Image might be too large (%d x %d)",
decodeInfo.width(), decodeInfo.height());
return 4;
}
switch (codec->getPixels(decodeInfo, bitmap.getPixels(), bitmap.rowBytes(), &options,
colorPtr, colorCountPtr)) {
case SkCodec::kSuccess:
SkDebugf("Success!\n");
break;
case SkCodec::kIncompleteInput:
SkDebugf("Partial Success\n");
break;
case SkCodec::kInvalidConversion:
SkDebugf("Incompatible colortype conversion");
return 5;
default:
// Everything else is considered a failure.
SkDebugf("Couldn't getPixels.");
return 6;
}
dump_png(bitmap);
return 0;
}
int fuzz_skp(SkData* bytes) {
SkMemoryStream stream(bytes);
SkDebugf("Decoding\n");
SkAutoTUnref<SkPicture> pic(SkPicture::CreateFromStream(&stream));
if (!pic) {
SkDebugf("Couldn't decode as a picture.\n");
return 3;
}
SkDebugf("Rendering\n");
SkBitmap bitmap;
if (!FLAGS_dump.isEmpty()) {
SkIRect size = pic->cullRect().roundOut();
bitmap.allocN32Pixels(size.width(), size.height());
}
SkCanvas canvas(bitmap);
canvas.drawPicture(pic);
SkDebugf("Decoded and rendered an SkPicture!\n");
dump_png(bitmap);
return 0;
}
Fuzz::Fuzz(SkData* bytes) : fBytes(SkSafeRef(bytes)), fNextByte(0) {}
void Fuzz::signalBug () { raise(SIGSEGV); }
void Fuzz::signalBoring() { exit(0); }
template <typename T>
T Fuzz::nextT() {
if (fNextByte + sizeof(T) > fBytes->size()) {
this->signalBoring();
}
T val;
memcpy(&val, fBytes->bytes() + fNextByte, sizeof(T));
fNextByte += sizeof(T);
return val;
}
uint8_t Fuzz::nextB() { return this->nextT<uint8_t >(); }
uint32_t Fuzz::nextU() { return this->nextT<uint32_t>(); }
float Fuzz::nextF() { return this->nextT<float >(); }
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