ability_ability_runtime/test/fuzztest/appmanager_fuzzer/appmanager_fuzzer.cpp

/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * 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 "appmanager_fuzzer.h"

#include <cstddef>
#include <cstdint>

#include "app_mgr_service.h"
#include "message_parcel.h"
#include "securec.h"

using namespace OHOS::AAFwk;
using namespace OHOS::AppExecFwk;

namespace OHOS {
namespace {
constexpr int INPUT_ZERO = 0;
constexpr int INPUT_ONE = 1;
constexpr int INPUT_TWO = 2;
constexpr int INPUT_THREE = 3;
constexpr size_t U32_AT_SIZE = 4;
constexpr size_t OFFSET_ZERO = 24;
constexpr size_t OFFSET_ONE = 16;
constexpr size_t OFFSET_TWO = 8;
constexpr uint32_t MAX_APP_MGR_INTERFACE_CODE = 999; // 999 is max interface code.
const std::u16string APPMGR_INTERFACE_TOKEN = u"ohos.appexecfwk.AppMgr";
}

uint32_t GetU32Data(const char* ptr)
{
    // convert fuzz input data to an integer
    return (ptr[INPUT_ZERO] << OFFSET_ZERO) | (ptr[INPUT_ONE] << OFFSET_ONE) | (ptr[INPUT_TWO] << OFFSET_TWO) |
        ptr[INPUT_THREE];
}

bool DoSomethingInterestingWithMyAPI(const char* data, size_t size)
{
    for (uint32_t code = 0; code <= MAX_APP_MGR_INTERFACE_CODE; ++code) {
        MessageParcel parcel;
        parcel.WriteInterfaceToken(APPMGR_INTERFACE_TOKEN);
        parcel.WriteBuffer(data, size);
        parcel.RewindRead(0);
        MessageParcel reply;
        MessageOption option;
        std::shared_ptr<AppMgrService> appMgr = std::make_shared<AppMgrService>();
        appMgr->OnRemoteRequest(code, parcel, reply, option);
    }

    return true;
}
}

/* Fuzzer entry point */
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
    /* Run your code on data */
    if (data == nullptr) {
        std::cout << "invalid data" << std::endl;
        return 0;
    }

    /* Validate the length of size */
    if (size < OHOS::U32_AT_SIZE) {
        return 0;
    }

    char* ch = static_cast<char*>(malloc(size + 1));
    if (ch == nullptr) {
        std::cout << "malloc failed." << std::endl;
        return 0;
    }

    (void)memset_s(ch, size + 1, 0x00, size + 1);
    if (memcpy_s(ch, size, data, size) != EOK) {
        std::cout << "copy failed." << std::endl;
        free(ch);
        ch = nullptr;
        return 0;
    }
    OHOS::DoSomethingInterestingWithMyAPI(ch, size);
    free(ch);
    ch = nullptr;
    return 0;
}