111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define FUZZ_LOG_TAG "main"
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#include "binder.h"
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#include "binder_ndk.h"
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#include "hwbinder.h"
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#include "util.h"
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#include <android-base/logging.h>
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#include <cstdlib>
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#include <ctime>
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template <typename P>
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void doFuzz(
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const std::vector<ParcelRead<P>>& reads,
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const std::vector<uint8_t>& input,
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const std::vector<uint8_t>& instructions) {
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P p;
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p.setData(input.data(), input.size());
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// since we are only using a byte to index
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CHECK(reads.size() <= 255) << reads.size();
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for (size_t i = 0; i < instructions.size() - 1; i += 2) {
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uint8_t a = instructions[i];
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uint8_t readIdx = a % reads.size();
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uint8_t b = instructions[i + 1];
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FUZZ_LOG() << "Instruction: " << (i / 2) + 1 << "/" << instructions.size() / 2
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<< " cmd: " << static_cast<size_t>(a) << " (" << static_cast<size_t>(readIdx)
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<< ") arg: " << static_cast<size_t>(b) << " size: " << p.dataSize()
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<< " avail: " << p.dataAvail() << " pos: " << p.dataPosition()
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<< " cap: " << p.dataCapacity();
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reads[readIdx](p, b);
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}
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}
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void fuzz(uint8_t options, const std::vector<uint8_t>& input, const std::vector<uint8_t>& instructions) {
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uint8_t parcelType = options & 0x3;
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switch (parcelType) {
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case 0x0:
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doFuzz<::android::hardware::Parcel>(HWBINDER_PARCEL_READ_FUNCTIONS, input,
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instructions);
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break;
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case 0x1:
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doFuzz<::android::Parcel>(BINDER_PARCEL_READ_FUNCTIONS, input, instructions);
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break;
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case 0x2:
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doFuzz<NdkParcelAdapter>(BINDER_NDK_PARCEL_READ_FUNCTIONS, input, instructions);
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break;
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case 0x3:
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/*reserved for future use*/
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break;
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default:
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LOG_ALWAYS_FATAL("unknown parcel type %d", static_cast<int>(parcelType));
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}
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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if (size <= 1) return 0; // no use
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// avoid timeouts, see b/142617274, b/142473153
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if (size > 50000) return 0;
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uint8_t options = *data;
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data++;
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size--;
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// TODO: generate 'objects' data
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// data to fill out parcel
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size_t inputLen = size / 2;
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std::vector<uint8_t> input(data, data + inputLen);
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data += inputLen;
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size -= inputLen;
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// data to use to determine what to do
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size_t instructionLen = size;
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std::vector<uint8_t> instructions(data, data + instructionLen);
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data += instructionLen;
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size -= instructionLen;
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CHECK(size == 0) << "size: " << size;
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FUZZ_LOG() << "options: " << (int)options << " inputLen: " << inputLen << " instructionLen: " << instructionLen;
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FUZZ_LOG() << "input: " << hexString(input);
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FUZZ_LOG() << "instructions: " << hexString(instructions);
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fuzz(options, input, instructions);
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return 0;
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}
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