| /* |
| * Copyright (C) 2012 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.webkit; |
| |
| import android.app.ActivityManagerInternal; |
| import android.app.Application; |
| import android.app.AppGlobals; |
| import android.content.Context; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageInfo; |
| import android.content.pm.PackageManager; |
| import android.os.Build; |
| import android.os.Process; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| import android.os.StrictMode; |
| import android.os.SystemProperties; |
| import android.os.Trace; |
| import android.text.TextUtils; |
| import android.util.AndroidRuntimeException; |
| import android.util.Log; |
| import com.android.server.LocalServices; |
| import dalvik.system.VMRuntime; |
| |
| import java.io.File; |
| import java.util.Arrays; |
| |
| import com.android.internal.os.Zygote; |
| |
| /** |
| * Top level factory, used creating all the main WebView implementation classes. |
| * |
| * @hide |
| */ |
| public final class WebViewFactory { |
| |
| private static final String CHROMIUM_WEBVIEW_FACTORY = |
| "com.android.webview.chromium.WebViewChromiumFactoryProvider"; |
| |
| private static final String NULL_WEBVIEW_FACTORY = |
| "com.android.webview.nullwebview.NullWebViewFactoryProvider"; |
| |
| private static final String CHROMIUM_WEBVIEW_NATIVE_RELRO_32 = |
| "/data/misc/shared_relro/libwebviewchromium32.relro"; |
| private static final String CHROMIUM_WEBVIEW_NATIVE_RELRO_64 = |
| "/data/misc/shared_relro/libwebviewchromium64.relro"; |
| |
| public static final String CHROMIUM_WEBVIEW_VMSIZE_SIZE_PROPERTY = |
| "persist.sys.webview.vmsize"; |
| private static final long CHROMIUM_WEBVIEW_DEFAULT_VMSIZE_BYTES = 100 * 1024 * 1024; |
| |
| private static final String LOGTAG = "WebViewFactory"; |
| |
| private static final boolean DEBUG = false; |
| |
| // Cache the factory both for efficiency, and ensure any one process gets all webviews from the |
| // same provider. |
| private static WebViewFactoryProvider sProviderInstance; |
| private static final Object sProviderLock = new Object(); |
| private static boolean sAddressSpaceReserved = false; |
| private static PackageInfo sPackageInfo; |
| |
| public static String getWebViewPackageName() { |
| return AppGlobals.getInitialApplication().getString( |
| com.android.internal.R.string.config_webViewPackageName); |
| } |
| |
| public static PackageInfo getLoadedPackageInfo() { |
| return sPackageInfo; |
| } |
| |
| static WebViewFactoryProvider getProvider() { |
| synchronized (sProviderLock) { |
| // For now the main purpose of this function (and the factory abstraction) is to keep |
| // us honest and minimize usage of WebView internals when binding the proxy. |
| if (sProviderInstance != null) return sProviderInstance; |
| |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.getProvider()"); |
| try { |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.loadNativeLibrary()"); |
| loadNativeLibrary(); |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| |
| Class<WebViewFactoryProvider> providerClass; |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.getFactoryClass()"); |
| try { |
| providerClass = getFactoryClass(); |
| } catch (ClassNotFoundException e) { |
| Log.e(LOGTAG, "error loading provider", e); |
| throw new AndroidRuntimeException(e); |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| } |
| |
| StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads(); |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "providerClass.newInstance()"); |
| try { |
| try { |
| sProviderInstance = providerClass.getConstructor(WebViewDelegate.class) |
| .newInstance(new WebViewDelegate()); |
| } catch (Exception e) { |
| sProviderInstance = providerClass.newInstance(); |
| } |
| if (DEBUG) Log.v(LOGTAG, "Loaded provider: " + sProviderInstance); |
| return sProviderInstance; |
| } catch (Exception e) { |
| Log.e(LOGTAG, "error instantiating provider", e); |
| throw new AndroidRuntimeException(e); |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| StrictMode.setThreadPolicy(oldPolicy); |
| } |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| } |
| } |
| } |
| |
| private static Class<WebViewFactoryProvider> getFactoryClass() throws ClassNotFoundException { |
| Application initialApplication = AppGlobals.getInitialApplication(); |
| try { |
| // First fetch the package info so we can log the webview package version. |
| String packageName = getWebViewPackageName(); |
| sPackageInfo = initialApplication.getPackageManager().getPackageInfo(packageName, 0); |
| Log.i(LOGTAG, "Loading " + packageName + " version " + sPackageInfo.versionName + |
| " (code " + sPackageInfo.versionCode + ")"); |
| |
| // Construct a package context to load the Java code into the current app. |
| Context webViewContext = initialApplication.createPackageContext(packageName, |
| Context.CONTEXT_INCLUDE_CODE | Context.CONTEXT_IGNORE_SECURITY); |
| initialApplication.getAssets().addAssetPath( |
| webViewContext.getApplicationInfo().sourceDir); |
| ClassLoader clazzLoader = webViewContext.getClassLoader(); |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "Class.forName()"); |
| try { |
| return (Class<WebViewFactoryProvider>) Class.forName(CHROMIUM_WEBVIEW_FACTORY, true, |
| clazzLoader); |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| } |
| } catch (PackageManager.NameNotFoundException e) { |
| // If the package doesn't exist, then try loading the null WebView instead. |
| // If that succeeds, then this is a device without WebView support; if it fails then |
| // swallow the failure, complain that the real WebView is missing and rethrow the |
| // original exception. |
| try { |
| return (Class<WebViewFactoryProvider>) Class.forName(NULL_WEBVIEW_FACTORY); |
| } catch (ClassNotFoundException e2) { |
| // Ignore. |
| } |
| Log.e(LOGTAG, "Chromium WebView package does not exist", e); |
| throw new AndroidRuntimeException(e); |
| } |
| } |
| |
| /** |
| * Perform any WebView loading preparations that must happen in the zygote. |
| * Currently, this means allocating address space to load the real JNI library later. |
| */ |
| public static void prepareWebViewInZygote() { |
| try { |
| System.loadLibrary("webviewchromium_loader"); |
| long addressSpaceToReserve = |
| SystemProperties.getLong(CHROMIUM_WEBVIEW_VMSIZE_SIZE_PROPERTY, |
| CHROMIUM_WEBVIEW_DEFAULT_VMSIZE_BYTES); |
| sAddressSpaceReserved = nativeReserveAddressSpace(addressSpaceToReserve); |
| |
| if (sAddressSpaceReserved) { |
| if (DEBUG) { |
| Log.v(LOGTAG, "address space reserved: " + addressSpaceToReserve + " bytes"); |
| } |
| } else { |
| Log.e(LOGTAG, "reserving " + addressSpaceToReserve + |
| " bytes of address space failed"); |
| } |
| } catch (Throwable t) { |
| // Log and discard errors at this stage as we must not crash the zygote. |
| Log.e(LOGTAG, "error preparing native loader", t); |
| } |
| } |
| |
| /** |
| * Perform any WebView loading preparations that must happen at boot from the system server, |
| * after the package manager has started or after an update to the webview is installed. |
| * This must be called in the system server. |
| * Currently, this means spawning the child processes which will create the relro files. |
| */ |
| public static void prepareWebViewInSystemServer() { |
| String[] nativePaths = null; |
| try { |
| nativePaths = getWebViewNativeLibraryPaths(); |
| } catch (Throwable t) { |
| // Log and discard errors at this stage as we must not crash the system server. |
| Log.e(LOGTAG, "error preparing webview native library", t); |
| } |
| prepareWebViewInSystemServer(nativePaths); |
| } |
| |
| private static void prepareWebViewInSystemServer(String[] nativeLibraryPaths) { |
| if (DEBUG) Log.v(LOGTAG, "creating relro files"); |
| |
| // We must always trigger createRelRo regardless of the value of nativeLibraryPaths. Any |
| // unexpected values will be handled there to ensure that we trigger notifying any process |
| // waiting on relreo creation. |
| if (Build.SUPPORTED_32_BIT_ABIS.length > 0) { |
| if (DEBUG) Log.v(LOGTAG, "Create 32 bit relro"); |
| createRelroFile(false /* is64Bit */, nativeLibraryPaths); |
| } |
| |
| if (Build.SUPPORTED_64_BIT_ABIS.length > 0) { |
| if (DEBUG) Log.v(LOGTAG, "Create 64 bit relro"); |
| createRelroFile(true /* is64Bit */, nativeLibraryPaths); |
| } |
| } |
| |
| public static void onWebViewUpdateInstalled() { |
| String[] nativeLibs = null; |
| try { |
| nativeLibs = WebViewFactory.getWebViewNativeLibraryPaths(); |
| if (nativeLibs != null) { |
| long newVmSize = 0L; |
| |
| for (String path : nativeLibs) { |
| if (DEBUG) Log.d(LOGTAG, "Checking file size of " + path); |
| if (path == null) continue; |
| File f = new File(path); |
| if (f.exists()) { |
| long length = f.length(); |
| if (length > newVmSize) { |
| newVmSize = length; |
| } |
| } |
| } |
| |
| if (DEBUG) { |
| Log.v(LOGTAG, "Based on library size, need " + newVmSize + |
| " bytes of address space."); |
| } |
| // The required memory can be larger than the file on disk (due to .bss), and an |
| // upgraded version of the library will likely be larger, so always attempt to |
| // reserve twice as much as we think to allow for the library to grow during this |
| // boot cycle. |
| newVmSize = Math.max(2 * newVmSize, CHROMIUM_WEBVIEW_DEFAULT_VMSIZE_BYTES); |
| Log.d(LOGTAG, "Setting new address space to " + newVmSize); |
| SystemProperties.set(CHROMIUM_WEBVIEW_VMSIZE_SIZE_PROPERTY, |
| Long.toString(newVmSize)); |
| } |
| } catch (Throwable t) { |
| // Log and discard errors at this stage as we must not crash the system server. |
| Log.e(LOGTAG, "error preparing webview native library", t); |
| } |
| prepareWebViewInSystemServer(nativeLibs); |
| } |
| |
| private static String[] getWebViewNativeLibraryPaths() |
| throws PackageManager.NameNotFoundException { |
| final String NATIVE_LIB_FILE_NAME = "libwebviewchromium.so"; |
| |
| PackageManager pm = AppGlobals.getInitialApplication().getPackageManager(); |
| ApplicationInfo ai = pm.getApplicationInfo(getWebViewPackageName(), 0); |
| |
| String path32; |
| String path64; |
| boolean primaryArchIs64bit = VMRuntime.is64BitAbi(ai.primaryCpuAbi); |
| if (!TextUtils.isEmpty(ai.secondaryCpuAbi)) { |
| // Multi-arch case. |
| if (primaryArchIs64bit) { |
| // Primary arch: 64-bit, secondary: 32-bit. |
| path64 = ai.nativeLibraryDir; |
| path32 = ai.secondaryNativeLibraryDir; |
| } else { |
| // Primary arch: 32-bit, secondary: 64-bit. |
| path64 = ai.secondaryNativeLibraryDir; |
| path32 = ai.nativeLibraryDir; |
| } |
| } else if (primaryArchIs64bit) { |
| // Single-arch 64-bit. |
| path64 = ai.nativeLibraryDir; |
| path32 = ""; |
| } else { |
| // Single-arch 32-bit. |
| path32 = ai.nativeLibraryDir; |
| path64 = ""; |
| } |
| if (!TextUtils.isEmpty(path32)) path32 += "/" + NATIVE_LIB_FILE_NAME; |
| if (!TextUtils.isEmpty(path64)) path64 += "/" + NATIVE_LIB_FILE_NAME; |
| return new String[] { path32, path64 }; |
| } |
| |
| private static void createRelroFile(final boolean is64Bit, String[] nativeLibraryPaths) { |
| final String abi = |
| is64Bit ? Build.SUPPORTED_64_BIT_ABIS[0] : Build.SUPPORTED_32_BIT_ABIS[0]; |
| |
| // crashHandler is invoked by the ActivityManagerService when the isolated process crashes. |
| Runnable crashHandler = new Runnable() { |
| @Override |
| public void run() { |
| try { |
| Log.e(LOGTAG, "relro file creator for " + abi + " crashed. Proceeding without"); |
| getUpdateService().notifyRelroCreationCompleted(is64Bit, false); |
| } catch (RemoteException e) { |
| Log.e(LOGTAG, "Cannot reach WebViewUpdateService. " + e.getMessage()); |
| } |
| } |
| }; |
| |
| try { |
| if (nativeLibraryPaths == null |
| || nativeLibraryPaths[0] == null || nativeLibraryPaths[1] == null) { |
| throw new IllegalArgumentException( |
| "Native library paths to the WebView RelRo process must not be null!"); |
| } |
| int pid = LocalServices.getService(ActivityManagerInternal.class).startIsolatedProcess( |
| RelroFileCreator.class.getName(), nativeLibraryPaths, "WebViewLoader-" + abi, abi, |
| Process.SHARED_RELRO_UID, crashHandler); |
| if (pid <= 0) throw new Exception("Failed to start the relro file creator process"); |
| } catch (Throwable t) { |
| // Log and discard errors as we must not crash the system server. |
| Log.e(LOGTAG, "error starting relro file creator for abi " + abi, t); |
| crashHandler.run(); |
| } |
| } |
| |
| private static class RelroFileCreator { |
| // Called in an unprivileged child process to create the relro file. |
| public static void main(String[] args) { |
| boolean result = false; |
| boolean is64Bit = VMRuntime.getRuntime().is64Bit(); |
| try{ |
| if (args.length != 2 || args[0] == null || args[1] == null) { |
| Log.e(LOGTAG, "Invalid RelroFileCreator args: " + Arrays.toString(args)); |
| return; |
| } |
| Log.v(LOGTAG, "RelroFileCreator (64bit = " + is64Bit + "), " + |
| " 32-bit lib: " + args[0] + ", 64-bit lib: " + args[1]); |
| if (!sAddressSpaceReserved) { |
| Log.e(LOGTAG, "can't create relro file; address space not reserved"); |
| return; |
| } |
| result = nativeCreateRelroFile(args[0] /* path32 */, |
| args[1] /* path64 */, |
| CHROMIUM_WEBVIEW_NATIVE_RELRO_32, |
| CHROMIUM_WEBVIEW_NATIVE_RELRO_64); |
| if (result && DEBUG) Log.v(LOGTAG, "created relro file"); |
| } finally { |
| // We must do our best to always notify the update service, even if something fails. |
| try { |
| getUpdateService().notifyRelroCreationCompleted(is64Bit, result); |
| } catch (RemoteException e) { |
| Log.e(LOGTAG, "error notifying update service", e); |
| } |
| |
| if (!result) Log.e(LOGTAG, "failed to create relro file"); |
| |
| // Must explicitly exit or else this process will just sit around after we return. |
| System.exit(0); |
| } |
| } |
| } |
| |
| private static void loadNativeLibrary() { |
| if (!sAddressSpaceReserved) { |
| Log.e(LOGTAG, "can't load with relro file; address space not reserved"); |
| return; |
| } |
| |
| try { |
| getUpdateService().waitForRelroCreationCompleted(VMRuntime.getRuntime().is64Bit()); |
| } catch (RemoteException e) { |
| Log.e(LOGTAG, "error waiting for relro creation, proceeding without", e); |
| return; |
| } |
| |
| try { |
| String[] args = getWebViewNativeLibraryPaths(); |
| boolean result = nativeLoadWithRelroFile(args[0] /* path32 */, |
| args[1] /* path64 */, |
| CHROMIUM_WEBVIEW_NATIVE_RELRO_32, |
| CHROMIUM_WEBVIEW_NATIVE_RELRO_64); |
| if (!result) { |
| Log.w(LOGTAG, "failed to load with relro file, proceeding without"); |
| } else if (DEBUG) { |
| Log.v(LOGTAG, "loaded with relro file"); |
| } |
| } catch (PackageManager.NameNotFoundException e) { |
| Log.e(LOGTAG, "Failed to list WebView package libraries for loadNativeLibrary", e); |
| } |
| } |
| |
| private static IWebViewUpdateService getUpdateService() { |
| return IWebViewUpdateService.Stub.asInterface(ServiceManager.getService("webviewupdate")); |
| } |
| |
| private static native boolean nativeReserveAddressSpace(long addressSpaceToReserve); |
| private static native boolean nativeCreateRelroFile(String lib32, String lib64, |
| String relro32, String relro64); |
| private static native boolean nativeLoadWithRelroFile(String lib32, String lib64, |
| String relro32, String relro64); |
| } |