| /* |
| * Copyright (C) 2007 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.internal.os; |
| |
| import static android.system.OsConstants.S_IRWXG; |
| import static android.system.OsConstants.S_IRWXO; |
| |
| import android.content.res.Resources; |
| import android.content.res.TypedArray; |
| import android.icu.impl.CacheValue; |
| import android.icu.text.DecimalFormatSymbols; |
| import android.icu.util.ULocale; |
| import android.opengl.EGL14; |
| import android.os.Build; |
| import android.os.Environment; |
| import android.os.IInstalld; |
| import android.os.Process; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| import android.os.ServiceSpecificException; |
| import android.os.SystemClock; |
| import android.os.SystemProperties; |
| import android.os.Trace; |
| import android.os.UserHandle; |
| import android.os.ZygoteProcess; |
| import android.os.storage.StorageManager; |
| import android.security.keystore.AndroidKeyStoreProvider; |
| import android.system.ErrnoException; |
| import android.system.Os; |
| import android.system.OsConstants; |
| import android.system.StructCapUserData; |
| import android.system.StructCapUserHeader; |
| import android.text.Hyphenator; |
| import android.util.EventLog; |
| import android.util.Log; |
| import android.util.Slog; |
| import android.util.TimingsTraceLog; |
| import android.webkit.WebViewFactory; |
| import android.widget.TextView; |
| |
| import com.android.internal.logging.MetricsLogger; |
| import com.android.internal.util.Preconditions; |
| |
| import dalvik.system.DexFile; |
| import dalvik.system.VMRuntime; |
| import dalvik.system.ZygoteHooks; |
| |
| import libcore.io.IoUtils; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.security.Provider; |
| import java.security.Security; |
| |
| /** |
| * Startup class for the zygote process. |
| * |
| * Pre-initializes some classes, and then waits for commands on a UNIX domain |
| * socket. Based on these commands, forks off child processes that inherit |
| * the initial state of the VM. |
| * |
| * Please see {@link ZygoteConnection.Arguments} for documentation on the |
| * client protocol. |
| * |
| * @hide |
| */ |
| public class ZygoteInit { |
| private static final String TAG = "Zygote"; |
| |
| private static final String PROPERTY_DISABLE_OPENGL_PRELOADING = "ro.zygote.disable_gl_preload"; |
| private static final String PROPERTY_GFX_DRIVER = "ro.gfx.driver.0"; |
| |
| private static final int LOG_BOOT_PROGRESS_PRELOAD_START = 3020; |
| private static final int LOG_BOOT_PROGRESS_PRELOAD_END = 3030; |
| |
| /** when preloading, GC after allocating this many bytes */ |
| private static final int PRELOAD_GC_THRESHOLD = 50000; |
| |
| private static final String ABI_LIST_ARG = "--abi-list="; |
| |
| private static final String SOCKET_NAME_ARG = "--socket-name="; |
| |
| /** |
| * Used to pre-load resources. |
| */ |
| private static Resources mResources; |
| |
| /** |
| * The path of a file that contains classes to preload. |
| */ |
| private static final String PRELOADED_CLASSES = "/system/etc/preloaded-classes"; |
| |
| /** Controls whether we should preload resources during zygote init. */ |
| public static final boolean PRELOAD_RESOURCES = true; |
| |
| private static final int UNPRIVILEGED_UID = 9999; |
| private static final int UNPRIVILEGED_GID = 9999; |
| |
| private static final int ROOT_UID = 0; |
| private static final int ROOT_GID = 0; |
| |
| private static boolean sPreloadComplete; |
| |
| static void preload(TimingsTraceLog bootTimingsTraceLog) { |
| Log.d(TAG, "begin preload"); |
| bootTimingsTraceLog.traceBegin("BeginIcuCachePinning"); |
| beginIcuCachePinning(); |
| bootTimingsTraceLog.traceEnd(); // BeginIcuCachePinning |
| bootTimingsTraceLog.traceBegin("PreloadClasses"); |
| preloadClasses(); |
| bootTimingsTraceLog.traceEnd(); // PreloadClasses |
| bootTimingsTraceLog.traceBegin("PreloadResources"); |
| preloadResources(); |
| bootTimingsTraceLog.traceEnd(); // PreloadResources |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadAppProcessHALs"); |
| nativePreloadAppProcessHALs(); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadOpenGL"); |
| preloadOpenGL(); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| preloadSharedLibraries(); |
| preloadTextResources(); |
| // Ask the WebViewFactory to do any initialization that must run in the zygote process, |
| // for memory sharing purposes. |
| WebViewFactory.prepareWebViewInZygote(); |
| endIcuCachePinning(); |
| warmUpJcaProviders(); |
| Log.d(TAG, "end preload"); |
| |
| sPreloadComplete = true; |
| } |
| |
| public static void lazyPreload() { |
| Preconditions.checkState(!sPreloadComplete); |
| Log.i(TAG, "Lazily preloading resources."); |
| |
| preload(new TimingsTraceLog("ZygoteInitTiming_lazy", Trace.TRACE_TAG_DALVIK)); |
| } |
| |
| private static void beginIcuCachePinning() { |
| // Pin ICU data in memory from this point that would normally be held by soft references. |
| // Without this, any references created immediately below or during class preloading |
| // would be collected when the Zygote GC runs in gcAndFinalize(). |
| Log.i(TAG, "Installing ICU cache reference pinning..."); |
| |
| CacheValue.setStrength(CacheValue.Strength.STRONG); |
| |
| Log.i(TAG, "Preloading ICU data..."); |
| // Explicitly exercise code to cache data apps are likely to need. |
| ULocale[] localesToPin = { ULocale.ROOT, ULocale.US, ULocale.getDefault() }; |
| for (ULocale uLocale : localesToPin) { |
| new DecimalFormatSymbols(uLocale); |
| } |
| } |
| |
| private static void endIcuCachePinning() { |
| // All cache references created by ICU from this point will be soft. |
| CacheValue.setStrength(CacheValue.Strength.SOFT); |
| |
| Log.i(TAG, "Uninstalled ICU cache reference pinning..."); |
| } |
| |
| private static void preloadSharedLibraries() { |
| Log.i(TAG, "Preloading shared libraries..."); |
| System.loadLibrary("android"); |
| System.loadLibrary("compiler_rt"); |
| System.loadLibrary("jnigraphics"); |
| } |
| |
| native private static void nativePreloadAppProcessHALs(); |
| |
| private static void preloadOpenGL() { |
| String driverPackageName = SystemProperties.get(PROPERTY_GFX_DRIVER); |
| if (!SystemProperties.getBoolean(PROPERTY_DISABLE_OPENGL_PRELOADING, false) && |
| (driverPackageName == null || driverPackageName.isEmpty())) { |
| EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY); |
| } |
| } |
| |
| private static void preloadTextResources() { |
| Hyphenator.init(); |
| TextView.preloadFontCache(); |
| } |
| |
| /** |
| * Register AndroidKeyStoreProvider and warm up the providers that are already registered. |
| * |
| * By doing it here we avoid that each app does it when requesting a service from the |
| * provider for the first time. |
| */ |
| private static void warmUpJcaProviders() { |
| long startTime = SystemClock.uptimeMillis(); |
| Trace.traceBegin( |
| Trace.TRACE_TAG_DALVIK, "Starting installation of AndroidKeyStoreProvider"); |
| // AndroidKeyStoreProvider.install() manipulates the list of JCA providers to insert |
| // preferred providers. Note this is not done via security.properties as the JCA providers |
| // are not on the classpath in the case of, for example, raw dalvikvm runtimes. |
| AndroidKeyStoreProvider.install(); |
| Log.i(TAG, "Installed AndroidKeyStoreProvider in " |
| + (SystemClock.uptimeMillis() - startTime) + "ms."); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| |
| startTime = SystemClock.uptimeMillis(); |
| Trace.traceBegin( |
| Trace.TRACE_TAG_DALVIK, "Starting warm up of JCA providers"); |
| for (Provider p : Security.getProviders()) { |
| p.warmUpServiceProvision(); |
| } |
| Log.i(TAG, "Warmed up JCA providers in " |
| + (SystemClock.uptimeMillis() - startTime) + "ms."); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| } |
| |
| /** |
| * Performs Zygote process initialization. Loads and initializes |
| * commonly used classes. |
| * |
| * Most classes only cause a few hundred bytes to be allocated, but |
| * a few will allocate a dozen Kbytes (in one case, 500+K). |
| */ |
| private static void preloadClasses() { |
| final VMRuntime runtime = VMRuntime.getRuntime(); |
| |
| InputStream is; |
| try { |
| is = new FileInputStream(PRELOADED_CLASSES); |
| } catch (FileNotFoundException e) { |
| Log.e(TAG, "Couldn't find " + PRELOADED_CLASSES + "."); |
| return; |
| } |
| |
| Log.i(TAG, "Preloading classes..."); |
| long startTime = SystemClock.uptimeMillis(); |
| |
| // Drop root perms while running static initializers. |
| final int reuid = Os.getuid(); |
| final int regid = Os.getgid(); |
| |
| // We need to drop root perms only if we're already root. In the case of "wrapped" |
| // processes (see WrapperInit), this function is called from an unprivileged uid |
| // and gid. |
| boolean droppedPriviliges = false; |
| if (reuid == ROOT_UID && regid == ROOT_GID) { |
| try { |
| Os.setregid(ROOT_GID, UNPRIVILEGED_GID); |
| Os.setreuid(ROOT_UID, UNPRIVILEGED_UID); |
| } catch (ErrnoException ex) { |
| throw new RuntimeException("Failed to drop root", ex); |
| } |
| |
| droppedPriviliges = true; |
| } |
| |
| // Alter the target heap utilization. With explicit GCs this |
| // is not likely to have any effect. |
| float defaultUtilization = runtime.getTargetHeapUtilization(); |
| runtime.setTargetHeapUtilization(0.8f); |
| |
| try { |
| BufferedReader br |
| = new BufferedReader(new InputStreamReader(is), 256); |
| |
| int count = 0; |
| String line; |
| while ((line = br.readLine()) != null) { |
| // Skip comments and blank lines. |
| line = line.trim(); |
| if (line.startsWith("#") || line.equals("")) { |
| continue; |
| } |
| |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, line); |
| try { |
| if (false) { |
| Log.v(TAG, "Preloading " + line + "..."); |
| } |
| // Load and explicitly initialize the given class. Use |
| // Class.forName(String, boolean, ClassLoader) to avoid repeated stack lookups |
| // (to derive the caller's class-loader). Use true to force initialization, and |
| // null for the boot classpath class-loader (could as well cache the |
| // class-loader of this class in a variable). |
| Class.forName(line, true, null); |
| count++; |
| } catch (ClassNotFoundException e) { |
| Log.w(TAG, "Class not found for preloading: " + line); |
| } catch (UnsatisfiedLinkError e) { |
| Log.w(TAG, "Problem preloading " + line + ": " + e); |
| } catch (Throwable t) { |
| Log.e(TAG, "Error preloading " + line + ".", t); |
| if (t instanceof Error) { |
| throw (Error) t; |
| } |
| if (t instanceof RuntimeException) { |
| throw (RuntimeException) t; |
| } |
| throw new RuntimeException(t); |
| } |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| } |
| |
| Log.i(TAG, "...preloaded " + count + " classes in " |
| + (SystemClock.uptimeMillis()-startTime) + "ms."); |
| } catch (IOException e) { |
| Log.e(TAG, "Error reading " + PRELOADED_CLASSES + ".", e); |
| } finally { |
| IoUtils.closeQuietly(is); |
| // Restore default. |
| runtime.setTargetHeapUtilization(defaultUtilization); |
| |
| // Fill in dex caches with classes, fields, and methods brought in by preloading. |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadDexCaches"); |
| runtime.preloadDexCaches(); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| |
| // Bring back root. We'll need it later if we're in the zygote. |
| if (droppedPriviliges) { |
| try { |
| Os.setreuid(ROOT_UID, ROOT_UID); |
| Os.setregid(ROOT_GID, ROOT_GID); |
| } catch (ErrnoException ex) { |
| throw new RuntimeException("Failed to restore root", ex); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Load in commonly used resources, so they can be shared across |
| * processes. |
| * |
| * These tend to be a few Kbytes, but are frequently in the 20-40K |
| * range, and occasionally even larger. |
| */ |
| private static void preloadResources() { |
| final VMRuntime runtime = VMRuntime.getRuntime(); |
| |
| try { |
| mResources = Resources.getSystem(); |
| mResources.startPreloading(); |
| if (PRELOAD_RESOURCES) { |
| Log.i(TAG, "Preloading resources..."); |
| |
| long startTime = SystemClock.uptimeMillis(); |
| TypedArray ar = mResources.obtainTypedArray( |
| com.android.internal.R.array.preloaded_drawables); |
| int N = preloadDrawables(ar); |
| ar.recycle(); |
| Log.i(TAG, "...preloaded " + N + " resources in " |
| + (SystemClock.uptimeMillis()-startTime) + "ms."); |
| |
| startTime = SystemClock.uptimeMillis(); |
| ar = mResources.obtainTypedArray( |
| com.android.internal.R.array.preloaded_color_state_lists); |
| N = preloadColorStateLists(ar); |
| ar.recycle(); |
| Log.i(TAG, "...preloaded " + N + " resources in " |
| + (SystemClock.uptimeMillis()-startTime) + "ms."); |
| |
| if (mResources.getBoolean( |
| com.android.internal.R.bool.config_freeformWindowManagement)) { |
| startTime = SystemClock.uptimeMillis(); |
| ar = mResources.obtainTypedArray( |
| com.android.internal.R.array.preloaded_freeform_multi_window_drawables); |
| N = preloadDrawables(ar); |
| ar.recycle(); |
| Log.i(TAG, "...preloaded " + N + " resource in " |
| + (SystemClock.uptimeMillis() - startTime) + "ms."); |
| } |
| } |
| mResources.finishPreloading(); |
| } catch (RuntimeException e) { |
| Log.w(TAG, "Failure preloading resources", e); |
| } |
| } |
| |
| private static int preloadColorStateLists(TypedArray ar) { |
| int N = ar.length(); |
| for (int i=0; i<N; i++) { |
| int id = ar.getResourceId(i, 0); |
| if (false) { |
| Log.v(TAG, "Preloading resource #" + Integer.toHexString(id)); |
| } |
| if (id != 0) { |
| if (mResources.getColorStateList(id, null) == null) { |
| throw new IllegalArgumentException( |
| "Unable to find preloaded color resource #0x" |
| + Integer.toHexString(id) |
| + " (" + ar.getString(i) + ")"); |
| } |
| } |
| } |
| return N; |
| } |
| |
| |
| private static int preloadDrawables(TypedArray ar) { |
| int N = ar.length(); |
| for (int i=0; i<N; i++) { |
| int id = ar.getResourceId(i, 0); |
| if (false) { |
| Log.v(TAG, "Preloading resource #" + Integer.toHexString(id)); |
| } |
| if (id != 0) { |
| if (mResources.getDrawable(id, null) == null) { |
| throw new IllegalArgumentException( |
| "Unable to find preloaded drawable resource #0x" |
| + Integer.toHexString(id) |
| + " (" + ar.getString(i) + ")"); |
| } |
| } |
| } |
| return N; |
| } |
| |
| /** |
| * Runs several special GCs to try to clean up a few generations of |
| * softly- and final-reachable objects, along with any other garbage. |
| * This is only useful just before a fork(). |
| */ |
| /*package*/ static void gcAndFinalize() { |
| final VMRuntime runtime = VMRuntime.getRuntime(); |
| |
| /* runFinalizationSync() lets finalizers be called in Zygote, |
| * which doesn't have a HeapWorker thread. |
| */ |
| System.gc(); |
| runtime.runFinalizationSync(); |
| System.gc(); |
| } |
| |
| /** |
| * Finish remaining work for the newly forked system server process. |
| */ |
| private static Runnable handleSystemServerProcess(ZygoteConnection.Arguments parsedArgs) { |
| // set umask to 0077 so new files and directories will default to owner-only permissions. |
| Os.umask(S_IRWXG | S_IRWXO); |
| |
| if (parsedArgs.niceName != null) { |
| Process.setArgV0(parsedArgs.niceName); |
| } |
| |
| final String systemServerClasspath = Os.getenv("SYSTEMSERVERCLASSPATH"); |
| if (systemServerClasspath != null) { |
| performSystemServerDexOpt(systemServerClasspath); |
| // Capturing profiles is only supported for debug or eng builds since selinux normally |
| // prevents it. |
| boolean profileSystemServer = SystemProperties.getBoolean( |
| "dalvik.vm.profilesystemserver", false); |
| if (profileSystemServer && (Build.IS_USERDEBUG || Build.IS_ENG)) { |
| try { |
| prepareSystemServerProfile(systemServerClasspath); |
| } catch (Exception e) { |
| Log.wtf(TAG, "Failed to set up system server profile", e); |
| } |
| } |
| } |
| |
| if (parsedArgs.invokeWith != null) { |
| String[] args = parsedArgs.remainingArgs; |
| // If we have a non-null system server class path, we'll have to duplicate the |
| // existing arguments and append the classpath to it. ART will handle the classpath |
| // correctly when we exec a new process. |
| if (systemServerClasspath != null) { |
| String[] amendedArgs = new String[args.length + 2]; |
| amendedArgs[0] = "-cp"; |
| amendedArgs[1] = systemServerClasspath; |
| System.arraycopy(args, 0, amendedArgs, 2, args.length); |
| args = amendedArgs; |
| } |
| |
| WrapperInit.execApplication(parsedArgs.invokeWith, |
| parsedArgs.niceName, parsedArgs.targetSdkVersion, |
| VMRuntime.getCurrentInstructionSet(), null, args); |
| |
| throw new IllegalStateException("Unexpected return from WrapperInit.execApplication"); |
| } else { |
| ClassLoader cl = null; |
| if (systemServerClasspath != null) { |
| cl = createPathClassLoader(systemServerClasspath, parsedArgs.targetSdkVersion); |
| |
| Thread.currentThread().setContextClassLoader(cl); |
| } |
| |
| /* |
| * Pass the remaining arguments to SystemServer. |
| */ |
| return ZygoteInit.zygoteInit(parsedArgs.targetSdkVersion, parsedArgs.remainingArgs, cl); |
| } |
| |
| /* should never reach here */ |
| } |
| |
| /** |
| * Note that preparing the profiles for system server does not require special |
| * selinux permissions. From the installer perspective the system server is a regular package |
| * which can capture profile information. |
| */ |
| private static void prepareSystemServerProfile(String systemServerClasspath) |
| throws RemoteException { |
| if (systemServerClasspath.isEmpty()) { |
| return; |
| } |
| String[] codePaths = systemServerClasspath.split(":"); |
| |
| final IInstalld installd = IInstalld.Stub |
| .asInterface(ServiceManager.getService("installd")); |
| |
| String systemServerPackageName = "android"; |
| String systemServerProfileName = "primary.prof"; |
| installd.prepareAppProfile( |
| systemServerPackageName, |
| UserHandle.USER_SYSTEM, |
| UserHandle.getAppId(Process.SYSTEM_UID), |
| systemServerProfileName, |
| codePaths[0], |
| /*dexMetadata*/ null); |
| |
| File profileDir = Environment.getDataProfilesDePackageDirectory( |
| UserHandle.USER_SYSTEM, systemServerPackageName); |
| String profilePath = new File(profileDir, systemServerProfileName).getAbsolutePath(); |
| VMRuntime.registerAppInfo(profilePath, codePaths); |
| } |
| |
| public static void setApiBlacklistExemptions(String[] exemptions) { |
| VMRuntime.getRuntime().setHiddenApiExemptions(exemptions); |
| } |
| |
| public static void setHiddenApiAccessLogSampleRate(int percent) { |
| VMRuntime.getRuntime().setHiddenApiAccessLogSamplingRate(percent); |
| } |
| |
| /** |
| * Creates a PathClassLoader for the given class path that is associated with a shared |
| * namespace, i.e., this classloader can access platform-private native libraries. The |
| * classloader will use java.library.path as the native library path. |
| */ |
| static ClassLoader createPathClassLoader(String classPath, int targetSdkVersion) { |
| String libraryPath = System.getProperty("java.library.path"); |
| |
| return ClassLoaderFactory.createClassLoader(classPath, libraryPath, libraryPath, |
| ClassLoader.getSystemClassLoader(), targetSdkVersion, true /* isNamespaceShared */, |
| null /* classLoaderName */); |
| } |
| |
| /** |
| * Performs dex-opt on the elements of {@code classPath}, if needed. We |
| * choose the instruction set of the current runtime. |
| */ |
| private static void performSystemServerDexOpt(String classPath) { |
| final String[] classPathElements = classPath.split(":"); |
| final IInstalld installd = IInstalld.Stub |
| .asInterface(ServiceManager.getService("installd")); |
| final String instructionSet = VMRuntime.getRuntime().vmInstructionSet(); |
| |
| String classPathForElement = ""; |
| for (String classPathElement : classPathElements) { |
| // System server is fully AOTed and never profiled |
| // for profile guided compilation. |
| String systemServerFilter = SystemProperties.get( |
| "dalvik.vm.systemservercompilerfilter", "speed"); |
| |
| int dexoptNeeded; |
| try { |
| dexoptNeeded = DexFile.getDexOptNeeded( |
| classPathElement, instructionSet, systemServerFilter, |
| null /* classLoaderContext */, false /* newProfile */, false /* downgrade */); |
| } catch (FileNotFoundException ignored) { |
| // Do not add to the classpath. |
| Log.w(TAG, "Missing classpath element for system server: " + classPathElement); |
| continue; |
| } catch (IOException e) { |
| // Not fully clear what to do here as we don't know the cause of the |
| // IO exception. Add to the classpath to be conservative, but don't |
| // attempt to compile it. |
| Log.w(TAG, "Error checking classpath element for system server: " |
| + classPathElement, e); |
| dexoptNeeded = DexFile.NO_DEXOPT_NEEDED; |
| } |
| |
| if (dexoptNeeded != DexFile.NO_DEXOPT_NEEDED) { |
| final String packageName = "*"; |
| final String outputPath = null; |
| final int dexFlags = 0; |
| final String compilerFilter = systemServerFilter; |
| final String uuid = StorageManager.UUID_PRIVATE_INTERNAL; |
| final String seInfo = null; |
| final String classLoaderContext = |
| getSystemServerClassLoaderContext(classPathForElement); |
| final int targetSdkVersion = 0; // SystemServer targets the system's SDK version |
| try { |
| installd.dexopt(classPathElement, Process.SYSTEM_UID, packageName, |
| instructionSet, dexoptNeeded, outputPath, dexFlags, compilerFilter, |
| uuid, classLoaderContext, seInfo, false /* downgrade */, |
| targetSdkVersion, /*profileName*/ null, /*dexMetadataPath*/ null, |
| "server-dexopt"); |
| } catch (RemoteException | ServiceSpecificException e) { |
| // Ignore (but log), we need this on the classpath for fallback mode. |
| Log.w(TAG, "Failed compiling classpath element for system server: " |
| + classPathElement, e); |
| } |
| } |
| |
| classPathForElement = encodeSystemServerClassPath( |
| classPathForElement, classPathElement); |
| } |
| } |
| |
| /** |
| * Encodes the system server class loader context in a format that is accepted by dexopt. |
| * This assumes the system server is always loaded with a {@link dalvik.system.PathClassLoader}. |
| * |
| * Note that ideally we would use the {@code DexoptUtils} to compute this. However we have no |
| * dependency here on the server so we hard code the logic again. |
| */ |
| private static String getSystemServerClassLoaderContext(String classPath) { |
| return classPath == null ? "PCL[]" : "PCL[" + classPath + "]"; |
| } |
| |
| /** |
| * Encodes the class path in a format accepted by dexopt. |
| * @param classPath the old class path (may be empty). |
| * @param newElement the new class path elements |
| * @return the class path encoding resulted from appending {@code newElement} to |
| * {@code classPath}. |
| */ |
| private static String encodeSystemServerClassPath(String classPath, String newElement) { |
| return (classPath == null || classPath.isEmpty()) |
| ? newElement |
| : classPath + ":" + newElement; |
| } |
| |
| /** |
| * Prepare the arguments and forks for the system server process. |
| * |
| * Returns an {@code Runnable} that provides an entrypoint into system_server code in the |
| * child process, and {@code null} in the parent. |
| */ |
| private static Runnable forkSystemServer(String abiList, String socketName, |
| ZygoteServer zygoteServer) { |
| long capabilities = posixCapabilitiesAsBits( |
| OsConstants.CAP_IPC_LOCK, |
| OsConstants.CAP_KILL, |
| OsConstants.CAP_NET_ADMIN, |
| OsConstants.CAP_NET_BIND_SERVICE, |
| OsConstants.CAP_NET_BROADCAST, |
| OsConstants.CAP_NET_RAW, |
| OsConstants.CAP_SYS_MODULE, |
| OsConstants.CAP_SYS_NICE, |
| OsConstants.CAP_SYS_PTRACE, |
| OsConstants.CAP_SYS_TIME, |
| OsConstants.CAP_SYS_TTY_CONFIG, |
| OsConstants.CAP_WAKE_ALARM, |
| OsConstants.CAP_BLOCK_SUSPEND |
| ); |
| /* Containers run without some capabilities, so drop any caps that are not available. */ |
| StructCapUserHeader header = new StructCapUserHeader( |
| OsConstants._LINUX_CAPABILITY_VERSION_3, 0); |
| StructCapUserData[] data; |
| try { |
| data = Os.capget(header); |
| } catch (ErrnoException ex) { |
| throw new RuntimeException("Failed to capget()", ex); |
| } |
| capabilities &= ((long) data[0].effective) | (((long) data[1].effective) << 32); |
| |
| /* Hardcoded command line to start the system server */ |
| String args[] = { |
| "--setuid=1000", |
| "--setgid=1000", |
| "--setgroups=1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1018,1021,1023,1024,1032,1065,3001,3002,3003,3006,3007,3009,3010", |
| "--capabilities=" + capabilities + "," + capabilities, |
| "--nice-name=system_server", |
| "--runtime-args", |
| "--target-sdk-version=" + VMRuntime.SDK_VERSION_CUR_DEVELOPMENT, |
| "com.android.server.SystemServer", |
| }; |
| ZygoteConnection.Arguments parsedArgs = null; |
| |
| int pid; |
| |
| try { |
| parsedArgs = new ZygoteConnection.Arguments(args); |
| ZygoteConnection.applyDebuggerSystemProperty(parsedArgs); |
| ZygoteConnection.applyInvokeWithSystemProperty(parsedArgs); |
| |
| boolean profileSystemServer = SystemProperties.getBoolean( |
| "dalvik.vm.profilesystemserver", false); |
| if (profileSystemServer) { |
| parsedArgs.runtimeFlags |= Zygote.PROFILE_SYSTEM_SERVER; |
| } |
| |
| /* Request to fork the system server process */ |
| pid = Zygote.forkSystemServer( |
| parsedArgs.uid, parsedArgs.gid, |
| parsedArgs.gids, |
| parsedArgs.runtimeFlags, |
| null, |
| parsedArgs.permittedCapabilities, |
| parsedArgs.effectiveCapabilities); |
| } catch (IllegalArgumentException ex) { |
| throw new RuntimeException(ex); |
| } |
| |
| /* For child process */ |
| if (pid == 0) { |
| if (hasSecondZygote(abiList)) { |
| waitForSecondaryZygote(socketName); |
| } |
| |
| zygoteServer.closeServerSocket(); |
| return handleSystemServerProcess(parsedArgs); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Gets the bit array representation of the provided list of POSIX capabilities. |
| */ |
| private static long posixCapabilitiesAsBits(int... capabilities) { |
| long result = 0; |
| for (int capability : capabilities) { |
| if ((capability < 0) || (capability > OsConstants.CAP_LAST_CAP)) { |
| throw new IllegalArgumentException(String.valueOf(capability)); |
| } |
| result |= (1L << capability); |
| } |
| return result; |
| } |
| |
| public static void main(String argv[]) { |
| ZygoteServer zygoteServer = new ZygoteServer(); |
| |
| // Mark zygote start. This ensures that thread creation will throw |
| // an error. |
| ZygoteHooks.startZygoteNoThreadCreation(); |
| |
| // Zygote goes into its own process group. |
| try { |
| Os.setpgid(0, 0); |
| } catch (ErrnoException ex) { |
| throw new RuntimeException("Failed to setpgid(0,0)", ex); |
| } |
| |
| final Runnable caller; |
| try { |
| // Report Zygote start time to tron unless it is a runtime restart |
| if (!"1".equals(SystemProperties.get("sys.boot_completed"))) { |
| MetricsLogger.histogram(null, "boot_zygote_init", |
| (int) SystemClock.elapsedRealtime()); |
| } |
| |
| String bootTimeTag = Process.is64Bit() ? "Zygote64Timing" : "Zygote32Timing"; |
| TimingsTraceLog bootTimingsTraceLog = new TimingsTraceLog(bootTimeTag, |
| Trace.TRACE_TAG_DALVIK); |
| bootTimingsTraceLog.traceBegin("ZygoteInit"); |
| RuntimeInit.enableDdms(); |
| |
| boolean startSystemServer = false; |
| String socketName = "zygote"; |
| String abiList = null; |
| boolean enableLazyPreload = false; |
| for (int i = 1; i < argv.length; i++) { |
| if ("start-system-server".equals(argv[i])) { |
| startSystemServer = true; |
| } else if ("--enable-lazy-preload".equals(argv[i])) { |
| enableLazyPreload = true; |
| } else if (argv[i].startsWith(ABI_LIST_ARG)) { |
| abiList = argv[i].substring(ABI_LIST_ARG.length()); |
| } else if (argv[i].startsWith(SOCKET_NAME_ARG)) { |
| socketName = argv[i].substring(SOCKET_NAME_ARG.length()); |
| } else { |
| throw new RuntimeException("Unknown command line argument: " + argv[i]); |
| } |
| } |
| |
| if (abiList == null) { |
| throw new RuntimeException("No ABI list supplied."); |
| } |
| |
| zygoteServer.registerServerSocketFromEnv(socketName); |
| // In some configurations, we avoid preloading resources and classes eagerly. |
| // In such cases, we will preload things prior to our first fork. |
| if (!enableLazyPreload) { |
| bootTimingsTraceLog.traceBegin("ZygotePreload"); |
| EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_START, |
| SystemClock.uptimeMillis()); |
| preload(bootTimingsTraceLog); |
| EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_END, |
| SystemClock.uptimeMillis()); |
| bootTimingsTraceLog.traceEnd(); // ZygotePreload |
| } else { |
| Zygote.resetNicePriority(); |
| } |
| |
| // Do an initial gc to clean up after startup |
| bootTimingsTraceLog.traceBegin("PostZygoteInitGC"); |
| gcAndFinalize(); |
| bootTimingsTraceLog.traceEnd(); // PostZygoteInitGC |
| |
| bootTimingsTraceLog.traceEnd(); // ZygoteInit |
| // Disable tracing so that forked processes do not inherit stale tracing tags from |
| // Zygote. |
| Trace.setTracingEnabled(false, 0); |
| |
| Zygote.nativeSecurityInit(); |
| |
| // Zygote process unmounts root storage spaces. |
| Zygote.nativeUnmountStorageOnInit(); |
| |
| ZygoteHooks.stopZygoteNoThreadCreation(); |
| |
| if (startSystemServer) { |
| Runnable r = forkSystemServer(abiList, socketName, zygoteServer); |
| |
| // {@code r == null} in the parent (zygote) process, and {@code r != null} in the |
| // child (system_server) process. |
| if (r != null) { |
| r.run(); |
| return; |
| } |
| } |
| |
| Log.i(TAG, "Accepting command socket connections"); |
| |
| // The select loop returns early in the child process after a fork and |
| // loops forever in the zygote. |
| caller = zygoteServer.runSelectLoop(abiList); |
| } catch (Throwable ex) { |
| Log.e(TAG, "System zygote died with exception", ex); |
| throw ex; |
| } finally { |
| zygoteServer.closeServerSocket(); |
| } |
| |
| // We're in the child process and have exited the select loop. Proceed to execute the |
| // command. |
| if (caller != null) { |
| caller.run(); |
| } |
| } |
| |
| /** |
| * Return {@code true} if this device configuration has another zygote. |
| * |
| * We determine this by comparing the device ABI list with this zygotes |
| * list. If this zygote supports all ABIs this device supports, there won't |
| * be another zygote. |
| */ |
| private static boolean hasSecondZygote(String abiList) { |
| return !SystemProperties.get("ro.product.cpu.abilist").equals(abiList); |
| } |
| |
| private static void waitForSecondaryZygote(String socketName) { |
| String otherZygoteName = Process.ZYGOTE_SOCKET.equals(socketName) ? |
| Process.SECONDARY_ZYGOTE_SOCKET : Process.ZYGOTE_SOCKET; |
| ZygoteProcess.waitForConnectionToZygote(otherZygoteName); |
| } |
| |
| static boolean isPreloadComplete() { |
| return sPreloadComplete; |
| } |
| |
| /** |
| * Class not instantiable. |
| */ |
| private ZygoteInit() { |
| } |
| |
| /** |
| * The main function called when started through the zygote process. This |
| * could be unified with main(), if the native code in nativeFinishInit() |
| * were rationalized with Zygote startup.<p> |
| * |
| * Current recognized args: |
| * <ul> |
| * <li> <code> [--] <start class name> <args> |
| * </ul> |
| * |
| * @param targetSdkVersion target SDK version |
| * @param argv arg strings |
| */ |
| public static final Runnable zygoteInit(int targetSdkVersion, String[] argv, ClassLoader classLoader) { |
| if (RuntimeInit.DEBUG) { |
| Slog.d(RuntimeInit.TAG, "RuntimeInit: Starting application from zygote"); |
| } |
| |
| Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "ZygoteInit"); |
| RuntimeInit.redirectLogStreams(); |
| |
| RuntimeInit.commonInit(); |
| ZygoteInit.nativeZygoteInit(); |
| return RuntimeInit.applicationInit(targetSdkVersion, argv, classLoader); |
| } |
| |
| /** |
| * The main function called when starting a child zygote process. This is used as an |
| * alternative to zygoteInit(), which skips calling into initialization routines that |
| * start the Binder threadpool. |
| */ |
| static final Runnable childZygoteInit( |
| int targetSdkVersion, String[] argv, ClassLoader classLoader) { |
| RuntimeInit.Arguments args = new RuntimeInit.Arguments(argv); |
| return RuntimeInit.findStaticMain(args.startClass, args.startArgs, classLoader); |
| } |
| |
| private static final native void nativeZygoteInit(); |
| } |
