| /* |
| * 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.annotation.SystemApi; |
| import android.app.ActivityManagerInternal; |
| import android.app.ActivityManagerNative; |
| import android.app.AppGlobals; |
| import android.app.Application; |
| import android.content.Context; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.Signature; |
| 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.ArraySet; |
| import android.util.Log; |
| |
| import com.android.server.LocalServices; |
| |
| import dalvik.system.VMRuntime; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipFile; |
| |
| /** |
| * Top level factory, used creating all the main WebView implementation classes. |
| * |
| * @hide |
| */ |
| @SystemApi |
| 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; |
| |
| // Error codes for loadWebViewNativeLibraryFromPackage |
| public static final int LIBLOAD_SUCCESS = 0; |
| public static final int LIBLOAD_WRONG_PACKAGE_NAME = 1; |
| public static final int LIBLOAD_ADDRESS_SPACE_NOT_RESERVED = 2; |
| |
| // error codes for waiting for WebView preparation |
| public static final int LIBLOAD_FAILED_WAITING_FOR_RELRO = 3; |
| public static final int LIBLOAD_FAILED_LISTING_WEBVIEW_PACKAGES = 4; |
| |
| // native relro loading error codes |
| public static final int LIBLOAD_FAILED_TO_OPEN_RELRO_FILE = 5; |
| public static final int LIBLOAD_FAILED_TO_LOAD_LIBRARY = 6; |
| public static final int LIBLOAD_FAILED_JNI_CALL = 7; |
| |
| // more error codes for waiting for WebView preparation |
| public static final int LIBLOAD_FAILED_WAITING_FOR_WEBVIEW_REASON_UNKNOWN = 8; |
| |
| // error for namespace lookup |
| public static final int LIBLOAD_FAILED_TO_FIND_NAMESPACE = 10; |
| |
| private static String getWebViewPreparationErrorReason(int error) { |
| switch (error) { |
| case LIBLOAD_FAILED_WAITING_FOR_RELRO: |
| return "Time out waiting for Relro files being created"; |
| case LIBLOAD_FAILED_LISTING_WEBVIEW_PACKAGES: |
| return "No WebView installed"; |
| case LIBLOAD_FAILED_WAITING_FOR_WEBVIEW_REASON_UNKNOWN: |
| return "Crashed for unknown reason"; |
| } |
| return "Unknown"; |
| } |
| |
| /** |
| * @hide |
| */ |
| public static class MissingWebViewPackageException extends AndroidRuntimeException { |
| public MissingWebViewPackageException(String message) { super(message); } |
| public MissingWebViewPackageException(Exception e) { super(e); } |
| } |
| |
| /** |
| * @hide |
| */ |
| public static String getWebViewLibrary(ApplicationInfo ai) { |
| if (ai.metaData != null) |
| return ai.metaData.getString("com.android.webview.WebViewLibrary"); |
| return null; |
| } |
| |
| public static PackageInfo getLoadedPackageInfo() { |
| return sPackageInfo; |
| } |
| |
| /** |
| * Load the native library for the given package name iff that package |
| * name is the same as the one providing the webview. |
| */ |
| public static int loadWebViewNativeLibraryFromPackage(String packageName, |
| ClassLoader clazzLoader) { |
| WebViewProviderResponse response = null; |
| try { |
| response = getUpdateService().waitForAndGetProvider(); |
| } catch (RemoteException e) { |
| Log.e(LOGTAG, "error waiting for relro creation", e); |
| return LIBLOAD_FAILED_WAITING_FOR_WEBVIEW_REASON_UNKNOWN; |
| } |
| |
| |
| if (response.status != LIBLOAD_SUCCESS |
| && response.status != LIBLOAD_FAILED_WAITING_FOR_RELRO) { |
| return response.status; |
| } |
| if (!response.packageInfo.packageName.equals(packageName)) { |
| return LIBLOAD_WRONG_PACKAGE_NAME; |
| } |
| |
| PackageManager packageManager = AppGlobals.getInitialApplication().getPackageManager(); |
| PackageInfo packageInfo; |
| try { |
| packageInfo = packageManager.getPackageInfo(packageName, |
| PackageManager.GET_META_DATA | PackageManager.MATCH_DEBUG_TRIAGED_MISSING); |
| } catch (PackageManager.NameNotFoundException e) { |
| Log.e(LOGTAG, "Couldn't find package " + packageName); |
| return LIBLOAD_WRONG_PACKAGE_NAME; |
| } |
| sPackageInfo = packageInfo; |
| |
| int loadNativeRet = loadNativeLibrary(clazzLoader); |
| // If we failed waiting for relro we want to return that fact even if we successfully load |
| // the relro file. |
| if (loadNativeRet == LIBLOAD_SUCCESS) return response.status; |
| return loadNativeRet; |
| } |
| |
| 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; |
| |
| final int uid = android.os.Process.myUid(); |
| if (uid == android.os.Process.ROOT_UID || uid == android.os.Process.SYSTEM_UID) { |
| throw new UnsupportedOperationException( |
| "For security reasons, WebView is not allowed in privileged processes"); |
| } |
| |
| StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads(); |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.getProvider()"); |
| try { |
| Class<WebViewFactoryProvider> providerClass = getProviderClass(); |
| |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "providerClass.newInstance()"); |
| try { |
| sProviderInstance = providerClass.getConstructor(WebViewDelegate.class) |
| .newInstance(new WebViewDelegate()); |
| 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); |
| } |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| StrictMode.setThreadPolicy(oldPolicy); |
| } |
| } |
| } |
| |
| /** |
| * Returns true if the signatures match, false otherwise |
| */ |
| private static boolean signaturesEquals(Signature[] s1, Signature[] s2) { |
| if (s1 == null) { |
| return s2 == null; |
| } |
| if (s2 == null) return false; |
| |
| ArraySet<Signature> set1 = new ArraySet<>(); |
| for(Signature signature : s1) { |
| set1.add(signature); |
| } |
| ArraySet<Signature> set2 = new ArraySet<>(); |
| for(Signature signature : s2) { |
| set2.add(signature); |
| } |
| return set1.equals(set2); |
| } |
| |
| // Throws MissingWebViewPackageException on failure |
| private static void verifyPackageInfo(PackageInfo chosen, PackageInfo toUse) { |
| if (!chosen.packageName.equals(toUse.packageName)) { |
| throw new MissingWebViewPackageException("Failed to verify WebView provider, " |
| + "packageName mismatch, expected: " |
| + chosen.packageName + " actual: " + toUse.packageName); |
| } |
| if (chosen.versionCode > toUse.versionCode) { |
| throw new MissingWebViewPackageException("Failed to verify WebView provider, " |
| + "version code is lower than expected: " + chosen.versionCode |
| + " actual: " + toUse.versionCode); |
| } |
| if (getWebViewLibrary(toUse.applicationInfo) == null) { |
| throw new MissingWebViewPackageException("Tried to load an invalid WebView provider: " |
| + toUse.packageName); |
| } |
| if (!signaturesEquals(chosen.signatures, toUse.signatures)) { |
| throw new MissingWebViewPackageException("Failed to verify WebView provider, " |
| + "signature mismatch"); |
| } |
| } |
| |
| private static Context getWebViewContextAndSetProvider() { |
| Application initialApplication = AppGlobals.getInitialApplication(); |
| try { |
| WebViewProviderResponse response = null; |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, |
| "WebViewUpdateService.waitForAndGetProvider()"); |
| try { |
| response = getUpdateService().waitForAndGetProvider(); |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| } |
| if (response.status != LIBLOAD_SUCCESS |
| && response.status != LIBLOAD_FAILED_WAITING_FOR_RELRO) { |
| throw new MissingWebViewPackageException("Failed to load WebView provider: " |
| + getWebViewPreparationErrorReason(response.status)); |
| } |
| // Register to be killed before fetching package info - so that we will be |
| // killed if the package info goes out-of-date. |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "ActivityManager.addPackageDependency()"); |
| try { |
| ActivityManagerNative.getDefault().addPackageDependency( |
| response.packageInfo.packageName); |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| } |
| // Fetch package info and verify it against the chosen package |
| PackageInfo newPackageInfo = null; |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "PackageManager.getPackageInfo()"); |
| try { |
| newPackageInfo = initialApplication.getPackageManager().getPackageInfo( |
| response.packageInfo.packageName, |
| PackageManager.GET_SHARED_LIBRARY_FILES |
| | PackageManager.MATCH_DEBUG_TRIAGED_MISSING |
| // Make sure that we fetch the current provider even if its not |
| // installed for the current user |
| | PackageManager.MATCH_UNINSTALLED_PACKAGES |
| // Fetch signatures for verification |
| | PackageManager.GET_SIGNATURES |
| // Get meta-data for meta data flag verification |
| | PackageManager.GET_META_DATA); |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| } |
| |
| // Validate the newly fetched package info, throws MissingWebViewPackageException on |
| // failure |
| verifyPackageInfo(response.packageInfo, newPackageInfo); |
| |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, |
| "initialApplication.createApplicationContext"); |
| try { |
| // Construct an app context to load the Java code into the current app. |
| Context webViewContext = initialApplication.createApplicationContext( |
| newPackageInfo.applicationInfo, |
| Context.CONTEXT_INCLUDE_CODE | Context.CONTEXT_IGNORE_SECURITY); |
| sPackageInfo = newPackageInfo; |
| return webViewContext; |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| } |
| } catch (RemoteException | PackageManager.NameNotFoundException e) { |
| throw new MissingWebViewPackageException("Failed to load WebView provider: " + e); |
| } |
| } |
| |
| private static Class<WebViewFactoryProvider> getProviderClass() { |
| Context webViewContext = null; |
| Application initialApplication = AppGlobals.getInitialApplication(); |
| |
| try { |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, |
| "WebViewFactory.getWebViewContextAndSetProvider()"); |
| try { |
| webViewContext = getWebViewContextAndSetProvider(); |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| } |
| Log.i(LOGTAG, "Loading " + sPackageInfo.packageName + " version " + |
| sPackageInfo.versionName + " (code " + sPackageInfo.versionCode + ")"); |
| |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.getChromiumProviderClass()"); |
| try { |
| initialApplication.getAssets().addAssetPathAsSharedLibrary( |
| webViewContext.getApplicationInfo().sourceDir); |
| ClassLoader clazzLoader = webViewContext.getClassLoader(); |
| |
| Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.loadNativeLibrary()"); |
| loadNativeLibrary(clazzLoader); |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| |
| 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 (ClassNotFoundException e) { |
| Log.e(LOGTAG, "error loading provider", e); |
| throw new AndroidRuntimeException(e); |
| } finally { |
| Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW); |
| } |
| } catch (MissingWebViewPackageException 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); |
| } |
| } |
| |
| private static int prepareWebViewInSystemServer(String[] nativeLibraryPaths) { |
| if (DEBUG) Log.v(LOGTAG, "creating relro files"); |
| int numRelros = 0; |
| |
| // 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 relro creation. |
| if (Build.SUPPORTED_32_BIT_ABIS.length > 0) { |
| if (DEBUG) Log.v(LOGTAG, "Create 32 bit relro"); |
| createRelroFile(false /* is64Bit */, nativeLibraryPaths); |
| numRelros++; |
| } |
| |
| if (Build.SUPPORTED_64_BIT_ABIS.length > 0) { |
| if (DEBUG) Log.v(LOGTAG, "Create 64 bit relro"); |
| createRelroFile(true /* is64Bit */, nativeLibraryPaths); |
| numRelros++; |
| } |
| return numRelros; |
| } |
| |
| /** |
| * @hide |
| */ |
| public static int onWebViewProviderChanged(PackageInfo packageInfo) { |
| String[] nativeLibs = null; |
| try { |
| nativeLibs = WebViewFactory.getWebViewNativeLibraryPaths(packageInfo); |
| if (nativeLibs != null) { |
| long newVmSize = 0L; |
| |
| for (String path : nativeLibs) { |
| if (path == null || TextUtils.isEmpty(path)) continue; |
| if (DEBUG) Log.d(LOGTAG, "Checking file size of " + path); |
| File f = new File(path); |
| if (f.exists()) { |
| newVmSize = Math.max(newVmSize, f.length()); |
| continue; |
| } |
| if (path.contains("!/")) { |
| String[] split = TextUtils.split(path, "!/"); |
| if (split.length == 2) { |
| try (ZipFile z = new ZipFile(split[0])) { |
| ZipEntry e = z.getEntry(split[1]); |
| if (e != null && e.getMethod() == ZipEntry.STORED) { |
| newVmSize = Math.max(newVmSize, e.getSize()); |
| continue; |
| } |
| } |
| catch (IOException e) { |
| Log.e(LOGTAG, "error reading APK file " + split[0] + ", ", e); |
| } |
| } |
| } |
| Log.e(LOGTAG, "error sizing load for " + path); |
| } |
| |
| 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); |
| } |
| return prepareWebViewInSystemServer(nativeLibs); |
| } |
| |
| // throws MissingWebViewPackageException |
| private static String getLoadFromApkPath(String apkPath, |
| String[] abiList, |
| String nativeLibFileName) { |
| // Search the APK for a native library conforming to a listed ABI. |
| try (ZipFile z = new ZipFile(apkPath)) { |
| for (String abi : abiList) { |
| final String entry = "lib/" + abi + "/" + nativeLibFileName; |
| ZipEntry e = z.getEntry(entry); |
| if (e != null && e.getMethod() == ZipEntry.STORED) { |
| // Return a path formatted for dlopen() load from APK. |
| return apkPath + "!/" + entry; |
| } |
| } |
| } catch (IOException e) { |
| throw new MissingWebViewPackageException(e); |
| } |
| return ""; |
| } |
| |
| // throws MissingWebViewPackageException |
| private static String[] getWebViewNativeLibraryPaths(PackageInfo packageInfo) { |
| ApplicationInfo ai = packageInfo.applicationInfo; |
| final String NATIVE_LIB_FILE_NAME = getWebViewLibrary(ai); |
| |
| 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 = ""; |
| } |
| |
| // Form the full paths to the extracted native libraries. |
| // If libraries were not extracted, try load from APK paths instead. |
| if (!TextUtils.isEmpty(path32)) { |
| path32 += "/" + NATIVE_LIB_FILE_NAME; |
| File f = new File(path32); |
| if (!f.exists()) { |
| path32 = getLoadFromApkPath(ai.sourceDir, |
| Build.SUPPORTED_32_BIT_ABIS, |
| NATIVE_LIB_FILE_NAME); |
| } |
| } |
| if (!TextUtils.isEmpty(path64)) { |
| path64 += "/" + NATIVE_LIB_FILE_NAME; |
| File f = new File(path64); |
| if (!f.exists()) { |
| path64 = getLoadFromApkPath(ai.sourceDir, |
| Build.SUPPORTED_64_BIT_ABIS, |
| NATIVE_LIB_FILE_NAME); |
| } |
| } |
| |
| if (DEBUG) Log.v(LOGTAG, "Native 32-bit lib: " + path32 + ", 64-bit lib: " + path64); |
| 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(); |
| } 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(); |
| } 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); |
| } |
| } |
| } |
| |
| // Assumes that we have waited for relro creation and set sPackageInfo |
| private static int loadNativeLibrary(ClassLoader clazzLoader) { |
| if (!sAddressSpaceReserved) { |
| Log.e(LOGTAG, "can't load with relro file; address space not reserved"); |
| return LIBLOAD_ADDRESS_SPACE_NOT_RESERVED; |
| } |
| |
| String[] args = getWebViewNativeLibraryPaths(sPackageInfo); |
| int result = nativeLoadWithRelroFile(args[0] /* path32 */, |
| args[1] /* path64 */, |
| CHROMIUM_WEBVIEW_NATIVE_RELRO_32, |
| CHROMIUM_WEBVIEW_NATIVE_RELRO_64, |
| clazzLoader); |
| if (result != LIBLOAD_SUCCESS) { |
| Log.w(LOGTAG, "failed to load with relro file, proceeding without"); |
| } else if (DEBUG) { |
| Log.v(LOGTAG, "loaded with relro file"); |
| } |
| return result; |
| } |
| |
| private static String WEBVIEW_UPDATE_SERVICE_NAME = "webviewupdate"; |
| |
| /** @hide */ |
| public static IWebViewUpdateService getUpdateService() { |
| return IWebViewUpdateService.Stub.asInterface( |
| ServiceManager.getService(WEBVIEW_UPDATE_SERVICE_NAME)); |
| } |
| |
| private static native boolean nativeReserveAddressSpace(long addressSpaceToReserve); |
| private static native boolean nativeCreateRelroFile(String lib32, String lib64, |
| String relro32, String relro64); |
| private static native int nativeLoadWithRelroFile(String lib32, String lib64, |
| String relro32, String relro64, |
| ClassLoader clazzLoader); |
| } |
