| /* |
| * Copyright (C) 2021 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. |
| */ |
| |
| package android.security.cts; |
| |
| import android.os.IBinder; |
| import android.os.Parcel; |
| import android.platform.test.annotations.AsbSecurityTest; |
| import android.platform.test.annotations.SecurityTest; |
| import android.util.Log; |
| import androidx.test.runner.AndroidJUnit4; |
| import com.android.sts.common.util.StsExtraBusinessLogicTestCase; |
| import java.lang.reflect.Field; |
| import java.util.Collections; |
| import java.util.List; |
| import org.junit.runner.RunWith; |
| import org.junit.Test; |
| |
| import static org.hamcrest.core.Is.is; |
| import static org.hamcrest.core.IsNot.not; |
| import static org.junit.Assert.assertThat; |
| import static org.junit.Assume.assumeThat; |
| |
| @RunWith(AndroidJUnit4.class) |
| public class CVE_2021_0521 extends StsExtraBusinessLogicTestCase { |
| |
| private String TAG = "CVE_2021_0521"; |
| |
| private int getFunctionCode(String className) { |
| int code = -1; |
| try { |
| Class c = Class.forName(className); |
| Field field = c.getDeclaredField("TRANSACTION_getAllPackages"); |
| field.setAccessible(true); |
| code = field.getInt(c); |
| } catch (Exception e) { |
| Log.e(TAG, "Exception caught " + e.toString()); |
| } |
| return code; |
| } |
| |
| private IBinder getIBinderFromServiceManager(String serviceName) { |
| try { |
| return (IBinder) Class.forName("android.os.ServiceManager") |
| .getMethod("getService", String.class).invoke(null, serviceName); |
| } catch (Exception e) { |
| return null; |
| } |
| } |
| |
| /** |
| * b/174661955 |
| */ |
| @AsbSecurityTest(cveBugId = 174661955) |
| @SecurityTest(minPatchLevel = "2021-06") |
| @Test |
| public void testPocCVE_2021_0521() { |
| IBinder pmsBinder = getIBinderFromServiceManager("package"); |
| List<String> allPkgList = Collections.<String>emptyList(); |
| try { |
| String desciption = pmsBinder.getInterfaceDescriptor(); |
| int code = getFunctionCode(desciption + "$Stub"); |
| assumeThat(code, not(is(-1))); |
| Parcel send = Parcel.obtain(); |
| Parcel reply = Parcel.obtain(); |
| send.writeInterfaceToken(desciption); |
| if (pmsBinder.transact(code, send, reply, 0)) { |
| reply.readException(); |
| allPkgList = reply.createStringArrayList(); |
| } |
| } catch (Exception e) { |
| Log.e(TAG, "Exception caught " + e.toString()); |
| } finally { |
| Log.e(TAG, "List of installed packages: " + allPkgList.toString()); |
| assertThat("Got a non empty list of installed packages, hence device " |
| + "is vulnerable to b/174661955", allPkgList.size(), is(0)); |
| } |
| } |
| } |