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/*
* Copyright (C) 2023 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 <BnTestService.h>
#include <fuzzbinder/libbinder_driver.h>
#include <binder/IPCThreadState.h>
#include <log/log.h>
#include <private/android_filesystem_config.h>
using android::binder::Status;
namespace android {
enum class CrashType {
NONE,
ON_PLAIN,
ON_BINDER,
ON_KNOWN_UID,
ON_SYSTEM_AID,
ON_ROOT_AID,
ON_DUMP_TRANSACT,
ON_SHELL_CMD_TRANSACT,
CRASH_ALWAYS,
};
// This service is to verify that fuzzService is functioning properly
class TestService : public BnTestService {
public:
TestService(CrashType crash) : mCrash(crash) {}
void onData() {
switch (mCrash) {
case CrashType::ON_PLAIN: {
LOG_ALWAYS_FATAL("Expected crash, PLAIN.");
break;
}
case CrashType::ON_KNOWN_UID: {
if (IPCThreadState::self()->getCallingUid() == getuid()) {
LOG_ALWAYS_FATAL("Expected crash, KNOWN_UID.");
}
break;
}
case CrashType::ON_SYSTEM_AID: {
if (IPCThreadState::self()->getCallingUid() == AID_SYSTEM) {
LOG_ALWAYS_FATAL("Expected crash, AID_SYSTEM.");
}
break;
}
case CrashType::ON_ROOT_AID: {
if (IPCThreadState::self()->getCallingUid() == AID_ROOT) {
LOG_ALWAYS_FATAL("Expected crash, AID_ROOT.");
}
break;
}
default:
break;
}
}
Status setIntData(int /*input*/) override {
onData();
return Status::ok();
}
Status setCharData(char16_t /*input*/) override {
onData();
return Status::ok();
}
Status setBooleanData(bool /*input*/) override {
onData();
return Status::ok();
}
Status setService(const sp<ITestService>& service) override {
onData();
if (mCrash == CrashType::ON_BINDER && service != nullptr) {
LOG_ALWAYS_FATAL("Expected crash, BINDER.");
}
return Status::ok();
}
status_t onTransact(uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) override {
if (mCrash == CrashType::ON_DUMP_TRANSACT && code == DUMP_TRANSACTION) {
LOG_ALWAYS_FATAL("Expected crash, DUMP.");
} else if (mCrash == CrashType::ON_SHELL_CMD_TRANSACT &&
code == SHELL_COMMAND_TRANSACTION) {
LOG_ALWAYS_FATAL("Expected crash, SHELL_CMD.");
}
return BnTestService::onTransact(code, data, reply, flags);
}
private:
CrashType mCrash;
};
CrashType gCrashType = CrashType::NONE;
extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {
if (*argc < 2) {
// This fuzzer is also used as test fuzzer to check infra pipeline.
// It should always run and find a crash in TestService.
gCrashType = CrashType::CRASH_ALWAYS;
return 0;
}
std::string arg = std::string((*argv)[1]);
// ignore first argument, because we consume it
(*argv)[1] = (*argv[0]);
(*argc)--;
(*argv)++;
if (arg == "PLAIN") {
gCrashType = CrashType::ON_PLAIN;
} else if (arg == "KNOWN_UID") {
gCrashType = CrashType::ON_KNOWN_UID;
} else if (arg == "AID_SYSTEM") {
gCrashType = CrashType::ON_SYSTEM_AID;
} else if (arg == "AID_ROOT") {
gCrashType = CrashType::ON_ROOT_AID;
} else if (arg == "BINDER") {
gCrashType = CrashType::ON_BINDER;
} else if (arg == "DUMP") {
gCrashType = CrashType::ON_DUMP_TRANSACT;
} else if (arg == "SHELL_CMD") {
gCrashType = CrashType::ON_SHELL_CMD_TRANSACT;
} else {
printf("INVALID ARG\n");
exit(0); // success because this is a crash test
}
return 0;
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
if (gCrashType == CrashType::CRASH_ALWAYS) {
LOG_ALWAYS_FATAL("Expected crash, This fuzzer will always crash.");
}
auto service = sp<TestService>::make(gCrashType);
fuzzService(service, FuzzedDataProvider(data, size));
return 0;
}
} // namespace android
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