| /* |
| * Copyright (C) 2016 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 static org.junit.Assert.fail; |
| import static org.junit.Assume.assumeTrue; |
| |
| import com.android.compatibility.common.util.CddTest; |
| import com.android.compatibility.common.util.PropertyUtil; |
| import com.android.tradefed.device.DeviceNotAvailableException; |
| import com.android.tradefed.device.ITestDevice; |
| import com.android.tradefed.testtype.DeviceJUnit4ClassRunner; |
| import com.android.tradefed.testtype.junit4.BaseHostJUnit4Test; |
| |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| /** |
| * Tests permission/security controls of the perf_event_open syscall. |
| */ |
| @RunWith(DeviceJUnit4ClassRunner.class) |
| public class PerfEventParanoidTest extends BaseHostJUnit4Test { |
| |
| // A reference to the device under test. |
| private ITestDevice mDevice; |
| |
| private static final String PERF_EVENT_PARANOID_PATH = "/proc/sys/kernel/perf_event_paranoid"; |
| private static final String PERF_EVENT_LSM_SYSPROP = "sys.init.perf_lsm_hooks"; |
| |
| private static final int ANDROID_R_API_LEVEL = 30; |
| private static final int ANDROID_S_API_LEVEL = 31; |
| |
| @Before |
| public void setUp() throws Exception { |
| mDevice = getDevice(); |
| } |
| |
| @CddTest(requirement="9.7") |
| @Test |
| public void testPerfEventRestricted() throws DeviceNotAvailableException { |
| assumeSecurityModelCompat(); |
| // Property set to "1" if init detected that the kernel has the perf_event_open SELinux |
| // hooks, otherwise left unset. |
| long lsmHookPropValue = mDevice.getIntProperty(PERF_EVENT_LSM_SYSPROP, 0); |
| |
| // Contents of the perf_event_paranoid sysctl procfs file. |
| String paranoidCmd = "cat " + PERF_EVENT_PARANOID_PATH; |
| String paranoidOut = mDevice.executeShellCommand(paranoidCmd); |
| |
| if (PropertyUtil.getFirstApiLevel(mDevice) >= ANDROID_R_API_LEVEL) { |
| // On devices launching with Android R or above, the kernel must have the LSM hooks. |
| if (lsmHookPropValue != 1) { |
| fail("\nDevices launching with Android R or above are required to have SELinux " |
| + "hooks for the perf_event_open(2) syscall.\n" |
| + "Please apply the relevant patch for your kernel located here:\n" |
| + "https://android-review.googlesource.com/q/hashtag:perf_event_lsm"); |
| } |
| } else { |
| // Devices upgrading to Android R can have either the LSM hooks, or |
| // default to perf_event_paranoid=3. |
| if (lsmHookPropValue != 1 && !paranoidOut.equals("3\n")) { |
| fail("\nDevice required to have either:\n" |
| + " (a) SELinux hooks for the perf_event_open(2) syscall\n" |
| + " (b) /proc/sys/kernel/perf_event_paranoid=3\n" |
| + "For (a), apply the relevant patch for your kernel located here:\n" |
| + "https://android-review.googlesource.com/q/hashtag:perf_event_lsm\n" |
| + "For (b), apply the relevant patch for your kernel located here:\n" |
| + "https://android-review.googlesource.com/#/q/topic:CONFIG_SECURITY_PERF_EVENTS_RESTRICT\n" |
| + "Device values: SELinux=" + lsmHookPropValue |
| + ", paranoid=" + paranoidOut); |
| } |
| } |
| } |
| |
| private void assumeSecurityModelCompat() throws DeviceNotAvailableException { |
| // This feature name check only applies to devices that first shipped with |
| // SC or later. |
| if (PropertyUtil.getFirstApiLevel(mDevice) >= ANDROID_S_API_LEVEL) { |
| assumeTrue("Skipping test: FEATURE_SECURITY_MODEL_COMPATIBLE missing.", |
| getDevice().hasFeature("feature:android.hardware.security.model.compatible")); |
| } |
| } |
| } |