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/*
* Copyright (C) 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 <fuzzbinder/random_parcel.h>
#include <android-base/logging.h>
#include <binder/IServiceManager.h>
#include <fuzzbinder/random_fd.h>
#include <utils/String16.h>
namespace android {
class NamedBinder : public BBinder {
public:
NamedBinder(const String16& descriptor) : mDescriptor(descriptor) {}
const String16& getInterfaceDescriptor() const override { return mDescriptor; }
private:
String16 mDescriptor;
};
void fillRandomParcel(Parcel* p, FuzzedDataProvider&& provider) {
while (provider.remaining_bytes() > 0) {
auto fillFunc = provider.PickValueInArray<const std::function<void()>>({
// write data
[&]() {
size_t toWrite =
provider.ConsumeIntegralInRange<size_t>(0, provider.remaining_bytes());
std::vector<uint8_t> data = provider.ConsumeBytes<uint8_t>(toWrite);
CHECK(OK == p->write(data.data(), data.size()));
},
// write FD
[&]() {
int fd = getRandomFd(&provider);
CHECK(OK == p->writeFileDescriptor(fd, true /*takeOwnership*/));
},
// write binder
[&]() {
auto makeFunc = provider.PickValueInArray<const std::function<sp<IBinder>()>>({
[&]() {
// descriptor is the length of a class name, e.g.
// "some.package.Foo"
std::string str =
provider.ConsumeRandomLengthString(100 /*max length*/);
return new NamedBinder(String16(str.c_str()));
},
[]() {
// this is the easiest remote binder to get ahold of, and it
// should be able to handle anything thrown at it, and
// essentially every process can talk to it, so it's a good
// candidate for checking usage of an actual BpBinder
return IInterface::asBinder(defaultServiceManager());
},
[]() { return nullptr; },
});
sp<IBinder> binder = makeFunc();
CHECK(OK == p->writeStrongBinder(binder));
},
});
fillFunc();
}
}
void fillRandomParcelData(Parcel* p, FuzzedDataProvider&& provider) {
std::vector<uint8_t> data = provider.ConsumeBytes<uint8_t>(provider.remaining_bytes());
CHECK(OK == p->write(data.data(), data.size()));
}
} // namespace android
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