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/*
* Copyright (C) 2017 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 com.android.dialer.strictmode.impl;
import android.app.Application;
import android.content.Context;
import android.os.Build;
import android.os.Handler;
import android.os.Looper;
import android.os.StrictMode;
import android.os.StrictMode.ThreadPolicy;
import android.os.StrictMode.VmPolicy;
import android.preference.PreferenceManager;
import android.support.annotation.MainThread;
import android.support.annotation.Nullable;
import android.support.v4.os.UserManagerCompat;
import com.android.dialer.buildtype.BuildType;
import com.android.dialer.common.Assert;
import com.android.dialer.strictmode.DialerStrictMode;
import com.android.dialer.util.DialerUtils;
import com.google.auto.value.AutoValue;
import java.util.Map;
import javax.inject.Inject;
final class SystemDialerStrictMode implements DialerStrictMode {
private static final VmPolicy VM_DEATH_PENALTY =
new StrictMode.VmPolicy.Builder().penaltyLog().penaltyDeath().build();
private static final ThreadPolicy THREAD_DEATH_PENALTY =
new StrictMode.ThreadPolicy.Builder().penaltyLog().penaltyDeath().build();
@Inject
public SystemDialerStrictMode() {}
@MainThread
@Override
public void onApplicationCreate(Application application) {
if (isStrictModeAllowed()) {
warmupSharedPrefs(application);
setRecommendedMainThreadPolicy(THREAD_DEATH_PENALTY);
setRecommendedVMPolicy(VM_DEATH_PENALTY);
// Because Android resets StrictMode policies after Application.onCreate is done, we set it
// again right after.
// See cl/105932355 for the discussion.
// See b/36951662 for the public bug.
Handler handler = new Handler(Looper.myLooper());
handler.postAtFrontOfQueue(() -> setRecommendedMainThreadPolicy(THREAD_DEATH_PENALTY));
}
}
/**
* We frequently access shared preferences on the main thread, which causes strict mode
* violations. When strict mode is allowed, warm up the shared preferences so that later uses of
* shared preferences access the in-memory versions and we don't have to bypass strict mode at
* every point in the application where shared preferences are accessed.
*/
private static void warmupSharedPrefs(Application application) {
// From credential-encrypted (CE) storage, i.e.:
// /data/data/com.android.dialer/shared_prefs
if (UserManagerCompat.isUserUnlocked(application)) {
// <package_name>_preferences.xml
PreferenceManager.getDefaultSharedPreferences(application);
// <package_name>.xml
application.getSharedPreferences(application.getPackageName(), Context.MODE_PRIVATE);
}
// From device-encrypted (DE) storage, i.e.:
// /data/user_de/0/com.android.dialer/shared_prefs/
// <package_name>_preferences.xml
DialerUtils.getDefaultSharedPreferenceForDeviceProtectedStorageContext(application);
}
private static boolean isStrictModeAllowed() {
return BuildType.get() == BuildType.BUGFOOD;
}
/**
* Set the recommended policy for the app.
*
* @param threadPenalties policy with preferred penalties. Detection bits will be ignored.
*/
private static void setRecommendedMainThreadPolicy(StrictMode.ThreadPolicy threadPenalties) {
StrictMode.ThreadPolicy threadPolicy =
new StrictMode.ThreadPolicy.Builder(threadPenalties).detectAll().build();
StrictMode.setThreadPolicy(threadPolicy);
}
/**
* Set the recommended policy for the app.
*
* @param vmPenalties policy with preferred penalties. Detection bits should be unset.
*/
private static void setRecommendedVMPolicy(StrictMode.VmPolicy vmPenalties) {
setRecommendedVMPolicy(vmPenalties, StrictModeVmConfig.empty());
}
/**
* Set the recommended policy for the app.
*
* @param vmPenalties policy with preferred penalties. Detection bits should be unset.
*/
private static void setRecommendedVMPolicy(
StrictMode.VmPolicy vmPenalties, StrictModeVmConfig config) {
Assert.isNotNull(config);
StrictMode.VmPolicy.Builder vmPolicyBuilder =
new StrictMode.VmPolicy.Builder(vmPenalties)
.detectLeakedClosableObjects()
.detectLeakedSqlLiteObjects();
if (Build.VERSION.SDK_INT >= 26) {
vmPolicyBuilder.detectContentUriWithoutPermission();
// TODO(azlatin): Enable detecting untagged sockets once: b/64840386 is fixed.
// vmPolicyBuilder.detectUntaggedSockets();
}
StrictMode.setVmPolicy(vmPolicyBuilder.build());
}
/** VmPolicy configuration. */
@AutoValue
abstract static class StrictModeVmConfig {
/** A map of a class to the maximum number of allowed instances of that class. */
@Nullable
abstract Map<Class<?>, Integer> maxInstanceLimits();
public static StrictModeVmConfig empty() {
return builder().build();
}
public static Builder builder() {
return new AutoValue_SystemDialerStrictMode_StrictModeVmConfig.Builder();
}
/** VmPolicy configuration builder. */
@AutoValue.Builder
public abstract static class Builder {
public abstract Builder setMaxInstanceLimits(Map<Class<?>, Integer> limits);
public abstract StrictModeVmConfig build();
Builder() {}
}
StrictModeVmConfig() {}
}
}
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