+++ /dev/null
-#
-# 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.
-#
-
-LOCAL_PATH := $(call my-dir)
-include $(CLEAR_VARS)
-
-LOCAL_MODULE := webview_zygote
-
-LOCAL_SRC_FILES := webview_zygote.cpp
-
-LOCAL_CFLAGS := -Wall -Werror
-
-LOCAL_SHARED_LIBRARIES := \
- libandroid_runtime \
- libbinder \
- liblog \
- libcutils \
- libutils
-
-LOCAL_LDFLAGS_32 := -Wl,--version-script,art/sigchainlib/version-script32.txt -Wl,--export-dynamic
-LOCAL_LDFLAGS_64 := -Wl,--version-script,art/sigchainlib/version-script64.txt -Wl,--export-dynamic
-
-LOCAL_WHOLE_STATIC_LIBRARIES := libsigchain
-
-LOCAL_INIT_RC := webview_zygote32.rc
-
-# Always include the 32-bit version of webview_zygote. If the target is 64-bit,
-# also include the 64-bit webview_zygote.
-ifeq ($(TARGET_SUPPORTS_64_BIT_APPS),true)
- LOCAL_INIT_RC += webview_zygote64.rc
-endif
-
-LOCAL_MULTILIB := both
-
-LOCAL_MODULE_STEM_32 := webview_zygote32
-LOCAL_MODULE_STEM_64 := webview_zygote64
-
-include $(BUILD_EXECUTABLE)
+++ /dev/null
-/*
- * 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.
- */
-
-
-#define LOG_TAG "WebViewZygote"
-
-#include <sys/prctl.h>
-
-#include <android_runtime/AndroidRuntime.h>
-#include <binder/IPCThreadState.h>
-#include <binder/ProcessState.h>
-#include <utils/Log.h>
-#include <utils/String8.h>
-#include <utils/Vector.h>
-
-namespace android {
-
-class WebViewRuntime : public AndroidRuntime {
-public:
- WebViewRuntime(char* argBlockStart, size_t argBlockSize)
- : AndroidRuntime(argBlockStart, argBlockSize) {}
-
- ~WebViewRuntime() override {}
-
- void onStarted() override {
- // Nothing to do since this is a zygote server.
- }
-
- void onVmCreated(JNIEnv*) override {
- // Nothing to do when the VM is created in the zygote.
- }
-
- void onZygoteInit() override {
- // Called after a new process is forked.
- sp<ProcessState> proc = ProcessState::self();
- proc->startThreadPool();
- }
-
- void onExit(int code) override {
- IPCThreadState::self()->stopProcess();
- AndroidRuntime::onExit(code);
- }
-};
-
-} // namespace android
-
-int main(int argc, char* const argv[]) {
- if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
- LOG_ALWAYS_FATAL("PR_SET_NO_NEW_PRIVS failed: %s", strerror(errno));
- return 12;
- }
-
- size_t argBlockSize = 0;
- for (int i = 0; i < argc; ++i) {
- argBlockSize += strlen(argv[i]) + 1;
- }
-
- android::WebViewRuntime runtime(argv[0], argBlockSize);
- runtime.addOption("-Xzygote");
-
- android::Vector<android::String8> args;
- runtime.start("com.android.internal.os.WebViewZygoteInit", args, /*zygote=*/ true);
-}
+++ /dev/null
-#
-# 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.
-#
-
-service webview_zygote32 /system/bin/webview_zygote32
- user webview_zygote
- socket webview_zygote stream 660 webview_zygote system
-
-on property:init.svc.zygote=stopped
- stop webview_zygote32
+++ /dev/null
-#
-# 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.
-#
-
-service webview_zygote64 /system/bin/webview_zygote64
- user webview_zygote
- socket webview_zygote stream 660 webview_zygote system
-
-on property:init.svc.zygote=stopped
- stop webview_zygote64
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.os.Build;
-import android.os.SystemService;
+import android.os.ChildZygoteProcess;
+import android.os.Process;
import android.os.ZygoteProcess;
import android.text.TextUtils;
-import android.util.AndroidRuntimeException;
import android.util.Log;
import com.android.internal.annotations.GuardedBy;
import java.io.File;
-import java.io.IOException;
import java.util.ArrayList;
-import java.util.Arrays;
import java.util.List;
-import java.util.concurrent.TimeoutException;
/** @hide */
public class WebViewZygote {
private static final String LOGTAG = "WebViewZygote";
- private static final String WEBVIEW_ZYGOTE_SERVICE_32 = "webview_zygote32";
- private static final String WEBVIEW_ZYGOTE_SERVICE_64 = "webview_zygote64";
- private static final String WEBVIEW_ZYGOTE_SOCKET = "webview_zygote";
-
/**
* Lock object that protects all other static members.
*/
* is not running or is not connected.
*/
@GuardedBy("sLock")
- private static ZygoteProcess sZygote;
-
- /**
- * Variable that allows us to determine whether the WebView zygote Service has already been
- * started.
- */
- @GuardedBy("sLock")
- private static boolean sStartedService = false;
+ private static ChildZygoteProcess sZygote;
/**
* Information about the selected WebView package. This is set from #onWebViewProviderChanged().
synchronized (sLock) {
if (sZygote != null) return sZygote;
- waitForServiceStartAndConnect();
+ connectToZygoteIfNeededLocked();
return sZygote;
}
}
sMultiprocessEnabled = enabled;
// When toggling between multi-process being on/off, start or stop the
- // service. If it is enabled and the zygote is not yet started, bring up the service.
- // Otherwise, bring down the service. The name may be null if the package
- // information has not yet been resolved.
- final String serviceName = getServiceNameLocked();
- if (serviceName == null) return;
-
+ // zygote. If it is enabled and the zygote is not yet started, launch it.
+ // Otherwise, kill it. The name may be null if the package information has
+ // not yet been resolved.
if (enabled) {
- if (!sStartedService) {
- SystemService.start(serviceName);
- sStartedService = true;
- }
+ connectToZygoteIfNeededLocked();
} else {
- SystemService.stop(serviceName);
- sStartedService = false;
- sZygote = null;
+ stopZygoteLocked();
}
}
}
return;
}
- final String serviceName = getServiceNameLocked();
- sZygote = null;
-
- // The service may enter the RUNNING state before it opens the socket,
- // so connectToZygoteIfNeededLocked() may still fail.
- if (SystemService.isStopped(serviceName)) {
- SystemService.start(serviceName);
- } else {
- SystemService.restart(serviceName);
- }
- sStartedService = true;
- }
- }
-
- private static void waitForServiceStartAndConnect() {
- if (!sStartedService) {
- throw new AndroidRuntimeException("Tried waiting for the WebView Zygote Service to " +
- "start running without first starting the service.");
- }
-
- String serviceName;
- synchronized (sLock) {
- serviceName = getServiceNameLocked();
- }
- try {
- SystemService.waitForState(serviceName, SystemService.State.RUNNING, 5000);
- } catch (TimeoutException e) {
- Log.e(LOGTAG, "Timed out waiting for " + serviceName);
- return;
- }
-
- synchronized (sLock) {
- connectToZygoteIfNeededLocked();
+ stopZygoteLocked();
}
}
@GuardedBy("sLock")
- private static String getServiceNameLocked() {
- if (sPackage == null)
- return null;
-
- if (Arrays.asList(Build.SUPPORTED_64_BIT_ABIS).contains(
- sPackage.applicationInfo.primaryCpuAbi)) {
- return WEBVIEW_ZYGOTE_SERVICE_64;
+ private static void stopZygoteLocked() {
+ if (sZygote != null) {
+ // Close the connection and kill the zygote process. This will not cause
+ // child processes to be killed by itself. But if this is called in response to
+ // setMultiprocessEnabled() or onWebViewProviderChanged(), the WebViewUpdater
+ // will kill all processes that depend on the WebView package.
+ sZygote.close();
+ Process.killProcess(sZygote.getPid());
+ sZygote = null;
}
-
- return WEBVIEW_ZYGOTE_SERVICE_32;
}
@GuardedBy("sLock")
return;
}
- final String serviceName = getServiceNameLocked();
- if (!SystemService.isRunning(serviceName)) {
- Log.e(LOGTAG, serviceName + " is not running");
- return;
- }
-
try {
- sZygote = new ZygoteProcess(WEBVIEW_ZYGOTE_SOCKET, null);
+ sZygote = Process.zygoteProcess.startChildZygote(
+ "com.android.internal.os.WebViewZygoteInit",
+ "webview_zygote",
+ Process.WEBVIEW_ZYGOTE_UID,
+ Process.WEBVIEW_ZYGOTE_UID,
+ null, // gids
+ 0, // runtimeFlags
+ "webview_zygote", // seInfo
+ sPackage.applicationInfo.primaryCpuAbi, // abi
+ null); // instructionSet
// All the work below is usually done by LoadedApk, but the zygote can't talk to
// PackageManager or construct a LoadedApk since it's single-threaded pre-fork, so
final String cacheKey = (zipPaths.size() == 1) ? zipPaths.get(0) :
TextUtils.join(File.pathSeparator, zipPaths);
- ZygoteProcess.waitForConnectionToZygote(WEBVIEW_ZYGOTE_SOCKET);
+ ZygoteProcess.waitForConnectionToZygote(sZygote.getPrimarySocketAddress());
Log.d(LOGTAG, "Preloading package " + zip + " " + librarySearchPath);
sZygote.preloadPackageForAbi(zip, librarySearchPath, cacheKey,
Build.SUPPORTED_ABIS[0]);
} catch (Exception e) {
- Log.e(LOGTAG, "Error connecting to " + serviceName, e);
- sZygote = null;
+ Log.e(LOGTAG, "Error connecting to webview zygote", e);
+ stopZygoteLocked();
}
}
}
import android.app.ApplicationLoaders;
import android.net.LocalSocket;
+import android.net.LocalServerSocket;
import android.os.Build;
import android.system.ErrnoException;
import android.system.Os;
+import android.system.OsConstants;
import android.text.TextUtils;
import android.util.Log;
import android.webkit.WebViewFactory;
}
public static void main(String argv[]) {
- sServer = new WebViewZygoteServer();
+ Log.i(TAG, "Starting WebViewZygoteInit");
+
+ String socketName = null;
+ for (String arg : argv) {
+ Log.i(TAG, arg);
+ if (arg.startsWith(Zygote.CHILD_ZYGOTE_SOCKET_NAME_ARG)) {
+ socketName = arg.substring(Zygote.CHILD_ZYGOTE_SOCKET_NAME_ARG.length());
+ }
+ }
+ if (socketName == null) {
+ throw new RuntimeException("No " + Zygote.CHILD_ZYGOTE_SOCKET_NAME_ARG + " specified");
+ }
- // Zygote goes into its own process group.
try {
- Os.setpgid(0, 0);
+ Os.prctl(OsConstants.PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
} catch (ErrnoException ex) {
- throw new RuntimeException("Failed to setpgid(0,0)", ex);
+ throw new RuntimeException("Failed to set PR_SET_NO_NEW_PRIVS", ex);
}
+ sServer = new WebViewZygoteServer();
+
final Runnable caller;
try {
- sServer.registerServerSocketFromEnv("webview_zygote");
+ sServer.registerServerSocketAtAbstractName(socketName);
+
+ // Add the abstract socket to the FD whitelist so that the native zygote code
+ // can properly detach it after forking.
+ Zygote.nativeAllowFileAcrossFork("ABSTRACT/" + socketName);
+
// The select loop returns early in the child process after a fork and
// loops forever in the zygote.
caller = sServer.runSelectLoop(TextUtils.join(",", Build.SUPPORTED_ABIS));
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