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/*
* Copyright 2020 The Android Open Source Project
*
* 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 <android/imagedecoder.h>
#include <binder/IPCThreadState.h>
#include <stddef.h>
#include <stdint.h>
#include <cstdlib>
#include <memory>
#ifdef PNG_MUTATOR_DEFINE_LIBFUZZER_CUSTOM_MUTATOR
#include <fuzz/png_mutator.h>
#endif
struct DecoderDeleter {
void operator()(AImageDecoder* decoder) const { AImageDecoder_delete(decoder); }
};
using DecoderPointer = std::unique_ptr<AImageDecoder, DecoderDeleter>;
static DecoderPointer makeDecoder(const uint8_t* data, size_t size) {
AImageDecoder* decoder = nullptr;
int result = AImageDecoder_createFromBuffer(data, size, &decoder);
if (result != ANDROID_IMAGE_DECODER_SUCCESS) {
// This was not a valid image.
return nullptr;
}
return DecoderPointer(decoder);
}
struct PixelFreer {
void operator()(void* pixels) const { std::free(pixels); }
};
using PixelPointer = std::unique_ptr<void, PixelFreer>;
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
// Without this call, decoding HEIF may time out on binder IPC calls.
android::ProcessState::self()->startThreadPool();
DecoderPointer decoder = makeDecoder(data, size);
if (!decoder) {
return 0;
}
const AImageDecoderHeaderInfo* info = AImageDecoder_getHeaderInfo(decoder.get());
int32_t width = AImageDecoderHeaderInfo_getWidth(info);
int32_t height = AImageDecoderHeaderInfo_getHeight(info);
// Set an arbitrary limit on the size of an image. The fuzzer runs with a
// limited amount of memory, and keeping this allocation small allows the
// fuzzer to continue running to try to find more serious problems. This
// size is large enough to hold a photo taken by a current gen phone.
constexpr int32_t kMaxDimension = 5000;
if (width > kMaxDimension || height > kMaxDimension) {
return 0;
}
size_t stride = AImageDecoder_getMinimumStride(decoder.get());
size_t pixelSize = height * stride;
auto pixels = PixelPointer(std::malloc(pixelSize));
if (!pixels.get()) {
return 0;
}
while (true) {
int result = AImageDecoder_decodeImage(decoder.get(), pixels.get(), stride, pixelSize);
if (result != ANDROID_IMAGE_DECODER_SUCCESS) break;
result = AImageDecoder_advanceFrame(decoder.get());
if (result != ANDROID_IMAGE_DECODER_SUCCESS) break;
}
return 0;
}
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