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/*
* Copyright (C) 2019 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.
*/
#define FUZZ_LOG_TAG "main"
#include "binder.h"
#include "binder_ndk.h"
#include "hwbinder.h"
#include "util.h"
#include <iostream>
#include <android-base/hex.h>
#include <android-base/logging.h>
#include <android/binder_auto_utils.h>
#include <android/binder_libbinder.h>
#include <fuzzbinder/random_parcel.h>
#include <fuzzer/FuzzedDataProvider.h>
#include <cstdlib>
#include <ctime>
#include <sys/resource.h>
#include <sys/time.h>
using android::fillRandomParcel;
using android::RandomParcelOptions;
using android::sp;
using android::base::HexString;
void fillRandomParcel(::android::hardware::Parcel* p, FuzzedDataProvider&& provider,
RandomParcelOptions* options) {
// TODO: functionality to create random parcels for libhwbinder parcels
(void)options;
std::vector<uint8_t> input = provider.ConsumeRemainingBytes<uint8_t>();
p->setData(input.data(), input.size());
}
static void fillRandomParcel(NdkParcelAdapter* p, FuzzedDataProvider&& provider,
RandomParcelOptions* options) {
// fill underlying parcel using functions to fill random libbinder parcel
fillRandomParcel(p->parcel(), std::move(provider), options);
}
template <typename P, typename B>
void doTransactFuzz(const char* backend, const sp<B>& binder, FuzzedDataProvider&& provider) {
uint32_t code = provider.ConsumeIntegral<uint32_t>();
uint32_t flag = provider.ConsumeIntegral<uint32_t>();
FUZZ_LOG() << "backend: " << backend;
RandomParcelOptions options;
P reply;
P data;
fillRandomParcel(&data, std::move(provider), &options);
(void)binder->transact(code, data, &reply, flag);
}
template <typename P>
void doReadFuzz(const char* backend, const std::vector<ParcelRead<P>>& reads,
FuzzedDataProvider&& provider) {
// Allow some majority of the bytes to be dedicated to telling us what to
// do. The fixed value added here represents that we want to test doing a
// lot of 'instructions' even on really short parcels.
size_t maxInstructions = 20 + (provider.remaining_bytes() * 2 / 3);
// but don't always use that many instructions. We want to allow the fuzzer
// to explore large parcels with few instructions if it wants to.
std::vector<uint8_t> instructions = provider.ConsumeBytes<uint8_t>(
provider.ConsumeIntegralInRange<size_t>(0, maxInstructions));
RandomParcelOptions options;
P p;
fillRandomParcel(&p, std::move(provider), &options);
// since we are only using a byte to index
CHECK(reads.size() <= 255) << reads.size();
FUZZ_LOG() << "backend: " << backend;
FUZZ_LOG() << "input: " << HexString(p.data(), p.dataSize());
FUZZ_LOG() << "instructions: " << HexString(instructions.data(), instructions.size());
FuzzedDataProvider instructionsProvider(instructions.data(), instructions.size());
while (instructionsProvider.remaining_bytes() > 0) {
uint8_t idx = instructionsProvider.ConsumeIntegralInRange<uint8_t>(0, reads.size() - 1);
FUZZ_LOG() << "Instruction " << idx << " avail: " << p.dataAvail()
<< " pos: " << p.dataPosition() << " cap: " << p.dataCapacity();
reads[idx](p, instructionsProvider);
}
}
// Append two random parcels.
template <typename P>
void doAppendFuzz(const char* backend, FuzzedDataProvider&& provider) {
int32_t start = provider.ConsumeIntegral<int32_t>();
int32_t len = provider.ConsumeIntegral<int32_t>();
std::vector<uint8_t> bytes = provider.ConsumeBytes<uint8_t>(
provider.ConsumeIntegralInRange<size_t>(0, provider.remaining_bytes()));
// same options so that FDs and binders could be shared in both Parcels
RandomParcelOptions options;
P p0, p1;
fillRandomParcel(&p0, FuzzedDataProvider(bytes.data(), bytes.size()), &options);
fillRandomParcel(&p1, std::move(provider), &options);
FUZZ_LOG() << "backend: " << backend;
FUZZ_LOG() << "start: " << start << " len: " << len;
p0.appendFrom(&p1, start, len);
}
void* NothingClass_onCreate(void* args) {
return args;
}
void NothingClass_onDestroy(void* /*userData*/) {}
binder_status_t NothingClass_onTransact(AIBinder*, transaction_code_t, const AParcel*, AParcel*) {
return STATUS_UNKNOWN_ERROR;
}
static AIBinder_Class* kNothingClass =
AIBinder_Class_define("nothing", NothingClass_onCreate, NothingClass_onDestroy,
NothingClass_onTransact);
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
if (size <= 1) return 0; // no use
// avoid timeouts, see b/142617274, b/142473153
if (size > 50000) return 0;
FuzzedDataProvider provider = FuzzedDataProvider(data, size);
const std::function<void(FuzzedDataProvider &&)> fuzzBackend[] = {
[](FuzzedDataProvider&& provider) {
doTransactFuzz<
::android::hardware::Parcel>("hwbinder",
sp<::android::hardware::BHwBinder>::make(),
std::move(provider));
},
[](FuzzedDataProvider&& provider) {
doTransactFuzz<::android::Parcel>("binder", sp<::android::BBinder>::make(),
std::move(provider));
},
[](FuzzedDataProvider&& provider) {
// fuzz from the libbinder layer since it's a superset of the
// interface you get at the libbinder_ndk layer
auto ndkBinder = ndk::SpAIBinder(AIBinder_new(kNothingClass, nullptr));
auto binder = AIBinder_toPlatformBinder(ndkBinder.get());
doTransactFuzz<::android::Parcel>("binder_ndk", binder, std::move(provider));
},
[](FuzzedDataProvider&& provider) {
doReadFuzz<::android::hardware::Parcel>("hwbinder", HWBINDER_PARCEL_READ_FUNCTIONS,
std::move(provider));
},
[](FuzzedDataProvider&& provider) {
doReadFuzz<::android::Parcel>("binder", BINDER_PARCEL_READ_FUNCTIONS,
std::move(provider));
},
[](FuzzedDataProvider&& provider) {
doReadFuzz<NdkParcelAdapter>("binder_ndk", BINDER_NDK_PARCEL_READ_FUNCTIONS,
std::move(provider));
},
[](FuzzedDataProvider&& provider) {
doAppendFuzz<::android::Parcel>("binder", std::move(provider));
},
[](FuzzedDataProvider&& provider) {
doAppendFuzz<NdkParcelAdapter>("binder_ndk", std::move(provider));
},
};
provider.PickValueInArray(fuzzBackend)(std::move(provider));
return 0;
}
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