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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/RpcSession.h>
#include <binder/RpcTransportRaw.h>
#include <fuzzbinder/random_binder.h>
#include <fuzzbinder/random_fd.h>
#include <utils/String16.h>
using android::binder::unique_fd;
namespace android {
static 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()));
}
void fillRandomParcel(Parcel* p, FuzzedDataProvider&& provider, RandomParcelOptions* options) {
CHECK_NE(options, nullptr);
if (provider.ConsumeBool()) {
auto session = RpcSession::make(RpcTransportCtxFactoryRaw::make());
CHECK_EQ(OK, session->addNullDebuggingClient());
// Set the protocol version so that we don't crash if the session
// actually gets used. This isn't cheating because the version should
// always be set if the session init succeeded and we aren't testing the
// session init here (it is bypassed by addNullDebuggingClient).
session->setProtocolVersion(RPC_WIRE_PROTOCOL_VERSION);
p->markForRpc(session);
if (options->writeHeader) {
options->writeHeader(p, provider);
}
fillRandomParcelData(p, std::move(provider));
return;
}
if (options->writeHeader) {
options->writeHeader(p, 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
[&]() {
// b/296516864 - Limit number of objects written to a parcel.
if (p->objectsCount() > 100) {
return;
}
if (provider.ConsumeBool() && options->extraFds.size() > 0) {
const unique_fd& fd = options->extraFds.at(
provider.ConsumeIntegralInRange<size_t>(0,
options->extraFds.size() -
1));
CHECK(OK == p->writeFileDescriptor(fd.get(), false /*takeOwnership*/));
} else {
// b/260119717 - Adding more FDs can eventually lead to FD limit exhaustion
if (options->extraFds.size() > 1000) {
return;
}
std::vector<unique_fd> fds = getRandomFds(&provider);
CHECK(OK ==
p->writeFileDescriptor(fds.begin()->release(),
true /*takeOwnership*/));
options->extraFds.insert(options->extraFds.end(),
std::make_move_iterator(fds.begin() + 1),
std::make_move_iterator(fds.end()));
}
},
// write binder
[&]() {
// b/296516864 - Limit number of objects written to a parcel.
if (p->objectsCount() > 100) {
return;
}
sp<IBinder> binder;
if (provider.ConsumeBool() && options->extraBinders.size() > 0) {
binder = options->extraBinders.at(
provider.ConsumeIntegralInRange<size_t>(0,
options->extraBinders
.size() -
1));
} else {
binder = getRandomBinder(&provider);
}
// may fail if mixing kernel binder and RPC binder
(void) p->writeStrongBinder(binder);
},
});
fillFunc();
}
}
} // namespace android
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