Move WebView relro related functionality to its own file. (ed98a156) · Commits · e / os / android_frameworks_base

core/java/android/webkit/WebViewFactory.java

+7 −256

Original line number	Original line	Diff line number	Diff line
	@@ -18,7 +18,6 @@ package android.webkit;

	import android.annotation.SystemApi;		import android.annotation.SystemApi;
	import android.app.ActivityManager;		import android.app.ActivityManager;
	import android.app.ActivityManagerInternal;
	import android.app.AppGlobals;		import android.app.AppGlobals;
	import android.app.Application;		import android.app.Application;
	import android.content.Context;		import android.content.Context;
	@@ -27,27 +26,15 @@ import android.content.pm.PackageInfo;
	import android.content.pm.PackageManager;		import android.content.pm.PackageManager;
	import android.content.pm.Signature;		import android.content.pm.Signature;
	import android.os.Build;		import android.os.Build;
	import android.os.Process;
	import android.os.RemoteException;		import android.os.RemoteException;
	import android.os.ServiceManager;		import android.os.ServiceManager;
	import android.os.StrictMode;		import android.os.StrictMode;
	import android.os.SystemProperties;
	import android.os.Trace;		import android.os.Trace;
	import android.text.TextUtils;
	import android.util.AndroidRuntimeException;		import android.util.AndroidRuntimeException;
	import android.util.ArraySet;		import android.util.ArraySet;
	import android.util.Log;		import android.util.Log;

	import com.android.server.LocalServices;

	import dalvik.system.VMRuntime;

	import java.lang.reflect.Method;		import java.lang.reflect.Method;
	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.		* Top level factory, used creating all the main WebView implementation classes.
	@@ -67,14 +54,8 @@ public final class WebViewFactory {
	private static final String NULL_WEBVIEW_FACTORY =		private static final String NULL_WEBVIEW_FACTORY =
	"com.android.webview.nullwebview.NullWebViewFactoryProvider";		"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 =		public static final String CHROMIUM_WEBVIEW_VMSIZE_SIZE_PROPERTY =
	"persist.sys.webview.vmsize";		"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 String LOGTAG = "WebViewFactory";

	@@ -84,7 +65,6 @@ public final class WebViewFactory {
	// same provider.		// same provider.
	private static WebViewFactoryProvider sProviderInstance;		private static WebViewFactoryProvider sProviderInstance;
	private static final Object sProviderLock = new Object();		private static final Object sProviderLock = new Object();
	private static boolean sAddressSpaceReserved = false;
	private static PackageInfo sPackageInfo;		private static PackageInfo sPackageInfo;

	// Error codes for loadWebViewNativeLibraryFromPackage		// Error codes for loadWebViewNativeLibraryFromPackage
	@@ -120,7 +100,7 @@ public final class WebViewFactory {
	return "Unknown";		return "Unknown";
	}		}

	private static class MissingWebViewPackageException extends Exception {		static class MissingWebViewPackageException extends Exception {
	public MissingWebViewPackageException(String message) { super(message); }		public MissingWebViewPackageException(String message) { super(message); }
	public MissingWebViewPackageException(Exception e) { super(e); }		public MissingWebViewPackageException(Exception e) { super(e); }
	}		}
	@@ -183,7 +163,7 @@ public final class WebViewFactory {
	}		}

	try {		try {
	int loadNativeRet = loadNativeLibrary(clazzLoader, packageInfo);		int loadNativeRet = WebViewLibraryLoader.loadNativeLibrary(clazzLoader, packageInfo);
	// If we failed waiting for relro we want to return that fact even if we successfully		// If we failed waiting for relro we want to return that fact even if we successfully
	// load the relro file.		// load the relro file.
	if (loadNativeRet == LIBLOAD_SUCCESS) return response.status;		if (loadNativeRet == LIBLOAD_SUCCESS) return response.status;
	@@ -414,7 +394,7 @@ public final class WebViewFactory {
	ClassLoader clazzLoader = webViewContext.getClassLoader();		ClassLoader clazzLoader = webViewContext.getClassLoader();

	Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.loadNativeLibrary()");		Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.loadNativeLibrary()");
	loadNativeLibrary(clazzLoader, sPackageInfo);		WebViewLibraryLoader.loadNativeLibrary(clazzLoader, sPackageInfo);
	Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW);		Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW);

	Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "Class.forName()");		Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "Class.forName()");
	@@ -450,20 +430,7 @@ public final class WebViewFactory {
	*/		*/
	public static void prepareWebViewInZygote() {		public static void prepareWebViewInZygote() {
	try {		try {
	System.loadLibrary("webviewchromium_loader");		WebViewLibraryLoader.reserveAddressSpaceInZygote();
	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) {		} catch (Throwable t) {
	// Log and discard errors at this stage as we must not crash the zygote.		// Log and discard errors at this stage as we must not crash the zygote.
	Log.e(LOGTAG, "error preparing native loader", t);		Log.e(LOGTAG, "error preparing native loader", t);
	@@ -479,13 +446,13 @@ public final class WebViewFactory {
	// waiting on relro creation.		// waiting on relro creation.
	if (Build.SUPPORTED_32_BIT_ABIS.length > 0) {		if (Build.SUPPORTED_32_BIT_ABIS.length > 0) {
	if (DEBUG) Log.v(LOGTAG, "Create 32 bit relro");		if (DEBUG) Log.v(LOGTAG, "Create 32 bit relro");
	createRelroFile(false /* is64Bit */, nativeLibraryPaths);		WebViewLibraryLoader.createRelroFile(false /* is64Bit */, nativeLibraryPaths);
	numRelros++;		numRelros++;
	}		}

	if (Build.SUPPORTED_64_BIT_ABIS.length > 0) {		if (Build.SUPPORTED_64_BIT_ABIS.length > 0) {
	if (DEBUG) Log.v(LOGTAG, "Create 64 bit relro");		if (DEBUG) Log.v(LOGTAG, "Create 64 bit relro");
	createRelroFile(true /* is64Bit */, nativeLibraryPaths);		WebViewLibraryLoader.createRelroFile(true /* is64Bit */, nativeLibraryPaths);
	numRelros++;		numRelros++;
	}		}
	return numRelros;		return numRelros;
	@@ -501,49 +468,7 @@ public final class WebViewFactory {
	fixupStubApplicationInfo(packageInfo.applicationInfo,		fixupStubApplicationInfo(packageInfo.applicationInfo,
	AppGlobals.getInitialApplication().getPackageManager());		AppGlobals.getInitialApplication().getPackageManager());

	nativeLibs = WebViewFactory.getWebViewNativeLibraryPaths(packageInfo);		nativeLibs = WebViewLibraryLoader.updateWebViewZygoteVmSize(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) {		} catch (Throwable t) {
	// Log and discard errors at this stage as we must not crash the system server.		// Log and discard errors at this stage as we must not crash the system server.
	Log.e(LOGTAG, "error preparing webview native library", t);		Log.e(LOGTAG, "error preparing webview native library", t);
	@@ -554,173 +479,6 @@ public final class WebViewFactory {
	return prepareWebViewInSystemServer(nativeLibs);		return prepareWebViewInSystemServer(nativeLibs);
	}		}

	private static String getLoadFromApkPath(String apkPath,
	String[] abiList,
	String nativeLibFileName)
	throws MissingWebViewPackageException {
	// 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 "";
	}

	private static String[] getWebViewNativeLibraryPaths(PackageInfo packageInfo)
	throws MissingWebViewPackageException {
	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
	private static int loadNativeLibrary(ClassLoader clazzLoader, PackageInfo packageInfo)
	throws MissingWebViewPackageException {
	if (!sAddressSpaceReserved) {
	Log.e(LOGTAG, "can't load with relro file; address space not reserved");
	return LIBLOAD_ADDRESS_SPACE_NOT_RESERVED;
	}

	String[] args = getWebViewNativeLibraryPaths(packageInfo);
	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";		private static String WEBVIEW_UPDATE_SERVICE_NAME = "webviewupdate";

	/** @hide */		/** @hide */
	@@ -728,11 +486,4 @@ public final class WebViewFactory {
	return IWebViewUpdateService.Stub.asInterface(		return IWebViewUpdateService.Stub.asInterface(
	ServiceManager.getService(WEBVIEW_UPDATE_SERVICE_NAME));		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);
	}		}

core/java/android/webkit/WebViewLibraryLoader.java

0 → 100644

+323 −0

File added.

Preview size limit exceeded, changes collapsed.