hostsidetests/security/src/android/cts/security/PerfEventParanoidTest.java

/*
 * 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 com.android.tradefed.device.ITestDevice;
import com.android.tradefed.device.DeviceNotAvailableException;
import com.android.tradefed.testtype.DeviceTestCase;

public class PerfEventParanoidTest extends DeviceTestCase {

   /**
    * a reference to the device under test.
    */
    private ITestDevice mDevice;

    private static final String PERF_EVENT_PARANOID_PATH = "/proc/sys/kernel/perf_event_paranoid";

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        mDevice = getDevice();
    }

    public void testPerfEventRestricted() throws DeviceNotAvailableException {
        String cmd = "cat " + PERF_EVENT_PARANOID_PATH;
        String output = mDevice.executeShellCommand(cmd);
        assertTrue("\n/proc/sys/kernel/perf_event_paranoid=3 is required.\n"
                   + "Please add CONFIG_SECURITY_PERF_EVENTS_RESTRICT=y\n"
                   + "to your device kernel's defconfig and apply the\n"
                   + "appropriate patches for your kernel located here:\n"
                   + "https://android-review.googlesource.com/#/q/topic:CONFIG_SECURITY_PERF_EVENTS_RESTRICT",
                   output.equals("3\n"));
    }
}