StrictMode is most commonly used to catch accidental disk or network access on the * application's main thread, where UI operations are received and animations take place. Keeping * disk and network operations off the main thread makes for much smoother, more responsive * applications. By keeping your application's main thread responsive, you also prevent ANR dialogs from being shown to * users. * *
Note that even though an Android device's disk is often on flash memory, many * devices run a filesystem on top of that memory with very limited concurrency. It's often the case * that almost all disk accesses are fast, but may in individual cases be dramatically slower when * certain I/O is happening in the background from other processes. If possible, it's best to assume * that such things are not fast. * *
Example code to enable from early in your {@link android.app.Application}, {@link * android.app.Activity}, or other application component's {@link android.app.Application#onCreate} * method: * *
* public void onCreate() {
* if (DEVELOPER_MODE) {
* StrictMode.setThreadPolicy(new {@link ThreadPolicy.Builder StrictMode.ThreadPolicy.Builder}()
* .detectDiskReads()
* .detectDiskWrites()
* .detectNetwork() // or .detectAll() for all detectable problems
* .penaltyLog()
* .build());
* StrictMode.setVmPolicy(new {@link VmPolicy.Builder StrictMode.VmPolicy.Builder}()
* .detectLeakedSqlLiteObjects()
* .detectLeakedClosableObjects()
* .penaltyLog()
* .penaltyDeath()
* .build());
* }
* super.onCreate();
* }
*
*
* You can decide what should happen when a violation is detected. For example, using {@link
* ThreadPolicy.Builder#penaltyLog} you can watch the output of adb logcat while you
* use your application to see the violations as they happen.
*
*
If you find violations that you feel are problematic, there are a variety of tools to help * solve them: threads, {@link android.os.Handler}, {@link android.os.AsyncTask}, {@link * android.app.IntentService}, etc. But don't feel compelled to fix everything that StrictMode * finds. In particular, many cases of disk access are often necessary during the normal activity * lifecycle. Use StrictMode to find things you did by accident. Network requests on the UI thread * are almost always a problem, though. * *
StrictMode is not a security mechanism and is not guaranteed to find all disk or * network accesses. While it does propagate its state across process boundaries when doing {@link * android.os.Binder} calls, it's still ultimately a best effort mechanism. Notably, disk or network * access from JNI calls won't necessarily trigger it. Future versions of Android may catch more (or * fewer) operations, so you should never leave StrictMode enabled in applications distributed on * Google Play. */ public final class StrictMode { private static final String TAG = "StrictMode"; private static final boolean LOG_V = Log.isLoggable(TAG, Log.VERBOSE); /** * Boolean system property to disable strict mode checks outright. Set this to 'true' to force * disable; 'false' has no effect on other enable/disable policy. * * @hide */ public static final String DISABLE_PROPERTY = "persist.sys.strictmode.disable"; /** * The boolean system property to control screen flashes on violations. * * @hide */ public static final String VISUAL_PROPERTY = "persist.sys.strictmode.visual"; /** * Temporary property used to include {@link #DETECT_VM_CLEARTEXT_NETWORK} in {@link * VmPolicy.Builder#detectAll()}. Apps can still always opt-into detection using {@link * VmPolicy.Builder#detectCleartextNetwork()}. */ private static final String CLEARTEXT_PROPERTY = "persist.sys.strictmode.clear"; // Only log a duplicate stack trace to the logs every second. private static final long MIN_LOG_INTERVAL_MS = 1000; // Only show an annoying dialog at most every 30 seconds private static final long MIN_DIALOG_INTERVAL_MS = 30000; // How many Span tags (e.g. animations) to report. private static final int MAX_SPAN_TAGS = 20; // How many offending stacks to keep track of (and time) per loop // of the Looper. private static final int MAX_OFFENSES_PER_LOOP = 10; // Byte 1: Thread-policy /** @hide */ @TestApi public static final int DETECT_DISK_WRITE = 0x01; // for ThreadPolicy /** @hide */ @TestApi public static final int DETECT_DISK_READ = 0x02; // for ThreadPolicy /** @hide */ @TestApi public static final int DETECT_NETWORK = 0x04; // for ThreadPolicy /** * For StrictMode.noteSlowCall() * * @hide */ @TestApi public static final int DETECT_CUSTOM = 0x08; // for ThreadPolicy /** * For StrictMode.noteResourceMismatch() * * @hide */ @TestApi public static final int DETECT_RESOURCE_MISMATCH = 0x10; // for ThreadPolicy /** @hide */ @TestApi public static final int DETECT_UNBUFFERED_IO = 0x20; // for ThreadPolicy private static final int ALL_THREAD_DETECT_BITS = DETECT_DISK_WRITE | DETECT_DISK_READ | DETECT_NETWORK | DETECT_CUSTOM | DETECT_RESOURCE_MISMATCH | DETECT_UNBUFFERED_IO; // Byte 2: Process-policy /** * Note, a "VM_" bit, not thread. * * @hide */ @TestApi public static final int DETECT_VM_CURSOR_LEAKS = 0x01 << 8; // for VmPolicy /** * Note, a "VM_" bit, not thread. * * @hide */ @TestApi public static final int DETECT_VM_CLOSABLE_LEAKS = 0x02 << 8; // for VmPolicy /** * Note, a "VM_" bit, not thread. * * @hide */ @TestApi public static final int DETECT_VM_ACTIVITY_LEAKS = 0x04 << 8; // for VmPolicy /** @hide */ @TestApi public static final int DETECT_VM_INSTANCE_LEAKS = 0x08 << 8; // for VmPolicy /** @hide */ @TestApi public static final int DETECT_VM_REGISTRATION_LEAKS = 0x10 << 8; // for VmPolicy /** @hide */ @TestApi public static final int DETECT_VM_FILE_URI_EXPOSURE = 0x20 << 8; // for VmPolicy /** @hide */ @TestApi public static final int DETECT_VM_CLEARTEXT_NETWORK = 0x40 << 8; // for VmPolicy /** @hide */ @TestApi public static final int DETECT_VM_CONTENT_URI_WITHOUT_PERMISSION = 0x80 << 8; // for VmPolicy /** @hide */ @TestApi public static final int DETECT_VM_UNTAGGED_SOCKET = 0x80 << 24; // for VmPolicy private static final int ALL_VM_DETECT_BITS = DETECT_VM_CURSOR_LEAKS | DETECT_VM_CLOSABLE_LEAKS | DETECT_VM_ACTIVITY_LEAKS | DETECT_VM_INSTANCE_LEAKS | DETECT_VM_REGISTRATION_LEAKS | DETECT_VM_FILE_URI_EXPOSURE | DETECT_VM_CLEARTEXT_NETWORK | DETECT_VM_CONTENT_URI_WITHOUT_PERMISSION | DETECT_VM_UNTAGGED_SOCKET; // Byte 3: Penalty /** {@hide} */ public static final int PENALTY_LOG = 0x01 << 16; // normal android.util.Log /** {@hide} */ public static final int PENALTY_DIALOG = 0x02 << 16; /** {@hide} */ public static final int PENALTY_DEATH = 0x04 << 16; /** {@hide} */ public static final int PENALTY_FLASH = 0x10 << 16; /** {@hide} */ public static final int PENALTY_DROPBOX = 0x20 << 16; /** * Non-public penalty mode which overrides all the other penalty bits and signals that we're in * a Binder call and we should ignore the other penalty bits and instead serialize back all our * offending stack traces to the caller to ultimately handle in the originating process. * *
This must be kept in sync with the constant in libs/binder/Parcel.cpp
*
* @hide
*/
public static final int PENALTY_GATHER = 0x40 << 16;
// Byte 4: Special cases
/**
* Death when network traffic is detected on main thread.
*
* @hide
*/
public static final int PENALTY_DEATH_ON_NETWORK = 0x01 << 24;
/**
* Death when cleartext network traffic is detected.
*
* @hide
*/
public static final int PENALTY_DEATH_ON_CLEARTEXT_NETWORK = 0x02 << 24;
/**
* Death when file exposure is detected.
*
* @hide
*/
public static final int PENALTY_DEATH_ON_FILE_URI_EXPOSURE = 0x04 << 24;
// CAUTION: we started stealing the top bits of Byte 4 for VM above
/** Mask of all the penalty bits valid for thread policies. */
private static final int THREAD_PENALTY_MASK =
PENALTY_LOG
| PENALTY_DIALOG
| PENALTY_DEATH
| PENALTY_DROPBOX
| PENALTY_GATHER
| PENALTY_DEATH_ON_NETWORK
| PENALTY_FLASH;
/** Mask of all the penalty bits valid for VM policies. */
private static final int VM_PENALTY_MASK =
PENALTY_LOG
| PENALTY_DEATH
| PENALTY_DROPBOX
| PENALTY_DEATH_ON_CLEARTEXT_NETWORK
| PENALTY_DEATH_ON_FILE_URI_EXPOSURE;
/** {@hide} */
public static final int NETWORK_POLICY_ACCEPT = 0;
/** {@hide} */
public static final int NETWORK_POLICY_LOG = 1;
/** {@hide} */
public static final int NETWORK_POLICY_REJECT = 2;
// TODO: wrap in some ImmutableHashMap thing.
// Note: must be before static initialization of sVmPolicy.
private static final HashMap The policy is enabled by {@link #setThreadPolicy}. The current policy can be retrieved
* with {@link #getThreadPolicy}.
*
* Note that multiple penalties may be provided and they're run in order from least to most
* severe (logging before process death, for example). There's currently no mechanism to choose
* different penalties for different detected actions.
*/
public static final class ThreadPolicy {
/** The default, lax policy which doesn't catch anything. */
public static final ThreadPolicy LAX = new ThreadPolicy(0);
final int mask;
private ThreadPolicy(int mask) {
this.mask = mask;
}
@Override
public String toString() {
return "[StrictMode.ThreadPolicy; mask=" + mask + "]";
}
/**
* Creates {@link ThreadPolicy} instances. Methods whose names start with {@code detect}
* specify what problems we should look for. Methods whose names start with {@code penalty}
* specify what we should do when we detect a problem.
*
* You can call as many {@code detect} and {@code penalty} methods as you like. Currently
* order is insignificant: all penalties apply to all detected problems.
*
* For example, detect everything and log anything that's found:
*
* As of the Gingerbread release this includes network and disk operations but will
* likely expand in future releases.
*/
public Builder detectAll() {
detectDiskReads();
detectDiskWrites();
detectNetwork();
final int targetSdk = VMRuntime.getRuntime().getTargetSdkVersion();
if (targetSdk >= Build.VERSION_CODES.HONEYCOMB) {
detectCustomSlowCalls();
}
if (targetSdk >= Build.VERSION_CODES.M) {
detectResourceMismatches();
}
if (targetSdk >= Build.VERSION_CODES.O) {
detectUnbufferedIo();
}
return this;
}
/** Disable the detection of everything. */
public Builder permitAll() {
return disable(ALL_THREAD_DETECT_BITS);
}
/** Enable detection of network operations. */
public Builder detectNetwork() {
return enable(DETECT_NETWORK);
}
/** Disable detection of network operations. */
public Builder permitNetwork() {
return disable(DETECT_NETWORK);
}
/** Enable detection of disk reads. */
public Builder detectDiskReads() {
return enable(DETECT_DISK_READ);
}
/** Disable detection of disk reads. */
public Builder permitDiskReads() {
return disable(DETECT_DISK_READ);
}
/** Enable detection of slow calls. */
public Builder detectCustomSlowCalls() {
return enable(DETECT_CUSTOM);
}
/** Disable detection of slow calls. */
public Builder permitCustomSlowCalls() {
return disable(DETECT_CUSTOM);
}
/** Disable detection of mismatches between defined resource types and getter calls. */
public Builder permitResourceMismatches() {
return disable(DETECT_RESOURCE_MISMATCH);
}
/** Detect unbuffered input/output operations. */
public Builder detectUnbufferedIo() {
return enable(DETECT_UNBUFFERED_IO);
}
/** Disable detection of unbuffered input/output operations. */
public Builder permitUnbufferedIo() {
return disable(DETECT_UNBUFFERED_IO);
}
/**
* Enables detection of mismatches between defined resource types and getter calls.
*
* This helps detect accidental type mismatches and potentially expensive type
* conversions when obtaining typed resources.
*
* For example, a strict mode violation would be thrown when calling {@link
* android.content.res.TypedArray#getInt(int, int)} on an index that contains a
* String-type resource. If the string value can be parsed as an integer, this method
* call will return a value without crashing; however, the developer should format the
* resource as an integer to avoid unnecessary type conversion.
*/
public Builder detectResourceMismatches() {
return enable(DETECT_RESOURCE_MISMATCH);
}
/** Enable detection of disk writes. */
public Builder detectDiskWrites() {
return enable(DETECT_DISK_WRITE);
}
/** Disable detection of disk writes. */
public Builder permitDiskWrites() {
return disable(DETECT_DISK_WRITE);
}
/**
* Show an annoying dialog to the developer on detected violations, rate-limited to be
* only a little annoying.
*/
public Builder penaltyDialog() {
return enable(PENALTY_DIALOG);
}
/**
* Crash the whole process on violation. This penalty runs at the end of all enabled
* penalties so you'll still get see logging or other violations before the process
* dies.
*
* Unlike {@link #penaltyDeathOnNetwork}, this applies to disk reads, disk writes,
* and network usage if their corresponding detect flags are set.
*/
public Builder penaltyDeath() {
return enable(PENALTY_DEATH);
}
/**
* Crash the whole process on any network usage. Unlike {@link #penaltyDeath}, this
* penalty runs before anything else. You must still have called {@link
* #detectNetwork} to enable this.
*
* In the Honeycomb or later SDKs, this is on by default.
*/
public Builder penaltyDeathOnNetwork() {
return enable(PENALTY_DEATH_ON_NETWORK);
}
/** Flash the screen during a violation. */
public Builder penaltyFlashScreen() {
return enable(PENALTY_FLASH);
}
/** Log detected violations to the system log. */
public Builder penaltyLog() {
return enable(PENALTY_LOG);
}
/**
* Enable detected violations log a stacktrace and timing data to the {@link
* android.os.DropBoxManager DropBox} on policy violation. Intended mostly for platform
* integrators doing beta user field data collection.
*/
public Builder penaltyDropBox() {
return enable(PENALTY_DROPBOX);
}
private Builder enable(int bit) {
mMask |= bit;
return this;
}
private Builder disable(int bit) {
mMask &= ~bit;
return this;
}
/**
* Construct the ThreadPolicy instance.
*
* Note: if no penalties are enabled before calling The policy is enabled by {@link #setVmPolicy}.
*/
public static final class VmPolicy {
/** The default, lax policy which doesn't catch anything. */
public static final VmPolicy LAX = new VmPolicy(0, EMPTY_CLASS_LIMIT_MAP);
final int mask;
// Map from class to max number of allowed instances in memory.
final HashMap You can call as many {@code detect} and {@code penalty} methods as you like. Currently
* order is insignificant: all penalties apply to all detected problems.
*
* For example, detect everything and log anything that's found:
*
* In the Honeycomb release this includes leaks of SQLite cursors, Activities, and
* other closable objects but will likely expand in future releases.
*/
public Builder detectAll() {
detectLeakedSqlLiteObjects();
final int targetSdk = VMRuntime.getRuntime().getTargetSdkVersion();
if (targetSdk >= Build.VERSION_CODES.HONEYCOMB) {
detectActivityLeaks();
detectLeakedClosableObjects();
}
if (targetSdk >= Build.VERSION_CODES.JELLY_BEAN) {
detectLeakedRegistrationObjects();
}
if (targetSdk >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
detectFileUriExposure();
}
if (targetSdk >= Build.VERSION_CODES.M) {
// TODO: always add DETECT_VM_CLEARTEXT_NETWORK once we have
// facility for apps to mark sockets that should be ignored
if (SystemProperties.getBoolean(CLEARTEXT_PROPERTY, false)) {
detectCleartextNetwork();
}
}
if (targetSdk >= Build.VERSION_CODES.O) {
detectContentUriWithoutPermission();
detectUntaggedSockets();
}
return this;
}
/**
* Detect when an {@link android.database.sqlite.SQLiteCursor} or other SQLite object is
* finalized without having been closed.
*
* You always want to explicitly close your SQLite cursors to avoid unnecessary
* database contention and temporary memory leaks.
*/
public Builder detectLeakedSqlLiteObjects() {
return enable(DETECT_VM_CURSOR_LEAKS);
}
/**
* Detect when an {@link java.io.Closeable} or other object with an explicit termination
* method is finalized without having been closed.
*
* You always want to explicitly close such objects to avoid unnecessary resources
* leaks.
*/
public Builder detectLeakedClosableObjects() {
return enable(DETECT_VM_CLOSABLE_LEAKS);
}
/**
* Detect when a {@link BroadcastReceiver} or {@link ServiceConnection} is leaked during
* {@link Context} teardown.
*/
public Builder detectLeakedRegistrationObjects() {
return enable(DETECT_VM_REGISTRATION_LEAKS);
}
/**
* Detect when the calling application exposes a {@code file://} {@link android.net.Uri}
* to another app.
*
* This exposure is discouraged since the receiving app may not have access to the
* shared path. For example, the receiving app may not have requested the {@link
* android.Manifest.permission#READ_EXTERNAL_STORAGE} runtime permission, or the
* platform may be sharing the {@link android.net.Uri} across user profile boundaries.
*
* Instead, apps should use {@code content://} Uris so the platform can extend
* temporary permission for the receiving app to access the resource.
*
* @see android.support.v4.content.FileProvider
* @see Intent#FLAG_GRANT_READ_URI_PERMISSION
*/
public Builder detectFileUriExposure() {
return enable(DETECT_VM_FILE_URI_EXPOSURE);
}
/**
* Detect any network traffic from the calling app which is not wrapped in SSL/TLS. This
* can help you detect places that your app is inadvertently sending cleartext data
* across the network.
*
* Using {@link #penaltyDeath()} or {@link #penaltyDeathOnCleartextNetwork()} will
* block further traffic on that socket to prevent accidental data leakage, in addition
* to crashing your process.
*
* Using {@link #penaltyDropBox()} will log the raw contents of the packet that
* triggered the violation.
*
* This inspects both IPv4/IPv6 and TCP/UDP network traffic, but it may be subject to
* false positives, such as when STARTTLS protocols or HTTP proxies are used.
*/
public Builder detectCleartextNetwork() {
return enable(DETECT_VM_CLEARTEXT_NETWORK);
}
/**
* Detect when the calling application sends a {@code content://} {@link
* android.net.Uri} to another app without setting {@link
* Intent#FLAG_GRANT_READ_URI_PERMISSION} or {@link
* Intent#FLAG_GRANT_WRITE_URI_PERMISSION}.
*
* Forgetting to include one or more of these flags when sending an intent is
* typically an app bug.
*
* @see Intent#FLAG_GRANT_READ_URI_PERMISSION
* @see Intent#FLAG_GRANT_WRITE_URI_PERMISSION
*/
public Builder detectContentUriWithoutPermission() {
return enable(DETECT_VM_CONTENT_URI_WITHOUT_PERMISSION);
}
/**
* Detect any sockets in the calling app which have not been tagged using {@link
* TrafficStats}. Tagging sockets can help you investigate network usage inside your
* app, such as a narrowing down heavy usage to a specific library or component.
*
* This currently does not detect sockets created in native code.
*
* @see TrafficStats#setThreadStatsTag(int)
* @see TrafficStats#tagSocket(java.net.Socket)
* @see TrafficStats#tagDatagramSocket(java.net.DatagramSocket)
*/
public Builder detectUntaggedSockets() {
return enable(DETECT_VM_UNTAGGED_SOCKET);
}
/**
* Crashes the whole process on violation. This penalty runs at the end of all enabled
* penalties so you'll still get your logging or other violations before the process
* dies.
*/
public Builder penaltyDeath() {
return enable(PENALTY_DEATH);
}
/**
* Crashes the whole process when cleartext network traffic is detected.
*
* @see #detectCleartextNetwork()
*/
public Builder penaltyDeathOnCleartextNetwork() {
return enable(PENALTY_DEATH_ON_CLEARTEXT_NETWORK);
}
/**
* Crashes the whole process when a {@code file://} {@link android.net.Uri} is exposed
* beyond this app.
*
* @see #detectFileUriExposure()
*/
public Builder penaltyDeathOnFileUriExposure() {
return enable(PENALTY_DEATH_ON_FILE_URI_EXPOSURE);
}
/** Log detected violations to the system log. */
public Builder penaltyLog() {
return enable(PENALTY_LOG);
}
/**
* Enable detected violations log a stacktrace and timing data to the {@link
* android.os.DropBoxManager DropBox} on policy violation. Intended mostly for platform
* integrators doing beta user field data collection.
*/
public Builder penaltyDropBox() {
return enable(PENALTY_DROPBOX);
}
private Builder enable(int bit) {
mMask |= bit;
return this;
}
Builder disable(int bit) {
mMask &= ~bit;
return this;
}
/**
* Construct the VmPolicy instance.
*
* Note: if no penalties are enabled before calling Internally this sets a thread-local variable which is propagated across cross-process IPC
* calls, meaning you can catch violations when a system service or another process accesses the
* disk or network on your behalf.
*
* @param policy the policy to put into place
*/
public static void setThreadPolicy(final ThreadPolicy policy) {
setThreadPolicyMask(policy.mask);
}
private static void setThreadPolicyMask(final int policyMask) {
// In addition to the Java-level thread-local in Dalvik's
// BlockGuard, we also need to keep a native thread-local in
// Binder in order to propagate the value across Binder calls,
// even across native-only processes. The two are kept in
// sync via the callback to onStrictModePolicyChange, below.
setBlockGuardPolicy(policyMask);
// And set the Android native version...
Binder.setThreadStrictModePolicy(policyMask);
}
// Sets the policy in Dalvik/libcore (BlockGuard)
private static void setBlockGuardPolicy(final int policyMask) {
if (policyMask == 0) {
BlockGuard.setThreadPolicy(BlockGuard.LAX_POLICY);
return;
}
final BlockGuard.Policy policy = BlockGuard.getThreadPolicy();
final AndroidBlockGuardPolicy androidPolicy;
if (policy instanceof AndroidBlockGuardPolicy) {
androidPolicy = (AndroidBlockGuardPolicy) policy;
} else {
androidPolicy = THREAD_ANDROID_POLICY.get();
BlockGuard.setThreadPolicy(androidPolicy);
}
androidPolicy.setPolicyMask(policyMask);
}
// Sets up CloseGuard in Dalvik/libcore
private static void setCloseGuardEnabled(boolean enabled) {
if (!(CloseGuard.getReporter() instanceof AndroidCloseGuardReporter)) {
CloseGuard.setReporter(new AndroidCloseGuardReporter());
}
CloseGuard.setEnabled(enabled);
}
/** @hide */
public static class StrictModeViolation extends BlockGuard.BlockGuardPolicyException {
public StrictModeViolation(int policyState, int policyViolated, String message) {
super(policyState, policyViolated, message);
}
}
/** @hide */
public static class StrictModeNetworkViolation extends StrictModeViolation {
public StrictModeNetworkViolation(int policyMask) {
super(policyMask, DETECT_NETWORK, null);
}
}
/** @hide */
private static class StrictModeDiskReadViolation extends StrictModeViolation {
public StrictModeDiskReadViolation(int policyMask) {
super(policyMask, DETECT_DISK_READ, null);
}
}
/** @hide */
private static class StrictModeDiskWriteViolation extends StrictModeViolation {
public StrictModeDiskWriteViolation(int policyMask) {
super(policyMask, DETECT_DISK_WRITE, null);
}
}
/** @hide */
private static class StrictModeCustomViolation extends StrictModeViolation {
public StrictModeCustomViolation(int policyMask, String name) {
super(policyMask, DETECT_CUSTOM, name);
}
}
/** @hide */
private static class StrictModeResourceMismatchViolation extends StrictModeViolation {
public StrictModeResourceMismatchViolation(int policyMask, Object tag) {
super(policyMask, DETECT_RESOURCE_MISMATCH, tag != null ? tag.toString() : null);
}
}
/** @hide */
private static class StrictModeUnbufferedIOViolation extends StrictModeViolation {
public StrictModeUnbufferedIOViolation(int policyMask) {
super(policyMask, DETECT_UNBUFFERED_IO, null);
}
}
/**
* Returns the bitmask of the current thread's policy.
*
* @return the bitmask of all the DETECT_* and PENALTY_* bits currently enabled
* @hide
*/
public static int getThreadPolicyMask() {
return BlockGuard.getThreadPolicy().getPolicyMask();
}
/** Returns the current thread's policy. */
public static ThreadPolicy getThreadPolicy() {
// TODO: this was a last minute Gingerbread API change (to
// introduce VmPolicy cleanly) but this isn't particularly
// optimal for users who might call this method often. This
// should be in a thread-local and not allocate on each call.
return new ThreadPolicy(getThreadPolicyMask());
}
/**
* A convenience wrapper that takes the current {@link ThreadPolicy} from {@link
* #getThreadPolicy}, modifies it to permit both disk reads & writes, and sets the new
* policy with {@link #setThreadPolicy}, returning the old policy so you can restore it at the
* end of a block.
*
* @return the old policy, to be passed to {@link #setThreadPolicy} to restore the policy at the
* end of a block
*/
public static ThreadPolicy allowThreadDiskWrites() {
int oldPolicyMask = getThreadPolicyMask();
int newPolicyMask = oldPolicyMask & ~(DETECT_DISK_WRITE | DETECT_DISK_READ);
if (newPolicyMask != oldPolicyMask) {
setThreadPolicyMask(newPolicyMask);
}
return new ThreadPolicy(oldPolicyMask);
}
/**
* A convenience wrapper that takes the current {@link ThreadPolicy} from {@link
* #getThreadPolicy}, modifies it to permit disk reads, and sets the new policy with {@link
* #setThreadPolicy}, returning the old policy so you can restore it at the end of a block.
*
* @return the old policy, to be passed to setThreadPolicy to restore the policy.
*/
public static ThreadPolicy allowThreadDiskReads() {
int oldPolicyMask = getThreadPolicyMask();
int newPolicyMask = oldPolicyMask & ~(DETECT_DISK_READ);
if (newPolicyMask != oldPolicyMask) {
setThreadPolicyMask(newPolicyMask);
}
return new ThreadPolicy(oldPolicyMask);
}
// We don't want to flash the screen red in the system server
// process, nor do we want to modify all the call sites of
// conditionallyEnableDebugLogging() in the system server,
// so instead we use this to determine if we are the system server.
private static boolean amTheSystemServerProcess() {
// Fast path. Most apps don't have the system server's UID.
if (Process.myUid() != Process.SYSTEM_UID) {
return false;
}
// The settings app, though, has the system server's UID so
// look up our stack to see if we came from the system server.
Throwable stack = new Throwable();
stack.fillInStackTrace();
for (StackTraceElement ste : stack.getStackTrace()) {
String clsName = ste.getClassName();
if (clsName != null && clsName.startsWith("com.android.server.")) {
return true;
}
}
return false;
}
/**
* Enable DropBox logging for debug phone builds.
*
* @hide
*/
public static boolean conditionallyEnableDebugLogging() {
boolean doFlashes =
SystemProperties.getBoolean(VISUAL_PROPERTY, false) && !amTheSystemServerProcess();
final boolean suppress = SystemProperties.getBoolean(DISABLE_PROPERTY, false);
// For debug builds, log event loop stalls to dropbox for analysis.
// Similar logic also appears in ActivityThread.java for system apps.
if (!doFlashes && (Build.IS_USER || suppress)) {
setCloseGuardEnabled(false);
return false;
}
// Eng builds have flashes on all the time. The suppression property
// overrides this, so we force the behavior only after the short-circuit
// check above.
if (Build.IS_ENG) {
doFlashes = true;
}
// Thread policy controls BlockGuard.
int threadPolicyMask =
StrictMode.DETECT_DISK_WRITE
| StrictMode.DETECT_DISK_READ
| StrictMode.DETECT_NETWORK;
if (!Build.IS_USER) {
threadPolicyMask |= StrictMode.PENALTY_DROPBOX;
}
if (doFlashes) {
threadPolicyMask |= StrictMode.PENALTY_FLASH;
}
StrictMode.setThreadPolicyMask(threadPolicyMask);
// VM Policy controls CloseGuard, detection of Activity leaks,
// and instance counting.
if (Build.IS_USER) {
setCloseGuardEnabled(false);
} else {
VmPolicy.Builder policyBuilder = new VmPolicy.Builder().detectAll();
if (!Build.IS_ENG) {
// Activity leak detection causes too much slowdown for userdebug because of the
// GCs.
policyBuilder = policyBuilder.disable(DETECT_VM_ACTIVITY_LEAKS);
}
policyBuilder = policyBuilder.penaltyDropBox();
if (Build.IS_ENG) {
policyBuilder.penaltyLog();
}
// All core system components need to tag their sockets to aid
// system health investigations
if (android.os.Process.myUid() < android.os.Process.FIRST_APPLICATION_UID) {
policyBuilder.enable(DETECT_VM_UNTAGGED_SOCKET);
} else {
policyBuilder.disable(DETECT_VM_UNTAGGED_SOCKET);
}
setVmPolicy(policyBuilder.build());
setCloseGuardEnabled(vmClosableObjectLeaksEnabled());
}
return true;
}
/**
* Used by the framework to make network usage on the main thread a fatal error.
*
* @hide
*/
public static void enableDeathOnNetwork() {
int oldPolicy = getThreadPolicyMask();
int newPolicy = oldPolicy | DETECT_NETWORK | PENALTY_DEATH_ON_NETWORK;
setThreadPolicyMask(newPolicy);
}
/**
* Used by the framework to make file usage a fatal error.
*
* @hide
*/
public static void enableDeathOnFileUriExposure() {
sVmPolicy =
new VmPolicy(
sVmPolicy.mask
| DETECT_VM_FILE_URI_EXPOSURE
| PENALTY_DEATH_ON_FILE_URI_EXPOSURE,
sVmPolicy.classInstanceLimit);
}
/**
* Used by lame internal apps that haven't done the hard work to get themselves off file:// Uris
* yet.
*
* @hide
*/
public static void disableDeathOnFileUriExposure() {
sVmPolicy =
new VmPolicy(
sVmPolicy.mask
& ~(DETECT_VM_FILE_URI_EXPOSURE
| PENALTY_DEATH_ON_FILE_URI_EXPOSURE),
sVmPolicy.classInstanceLimit);
}
/**
* Parses the BlockGuard policy mask out from the Exception's getMessage() String value. Kinda
* gross, but least invasive. :/
*
* Input is of the following forms: "policy=137 violation=64" "policy=137 violation=64
* msg=Arbitrary text"
*
* Returns 0 on failure, which is a valid policy, but not a valid policy during a violation
* (else there must've been some policy in effect to violate).
*/
private static int parsePolicyFromMessage(String message) {
if (message == null || !message.startsWith("policy=")) {
return 0;
}
int spaceIndex = message.indexOf(' ');
if (spaceIndex == -1) {
return 0;
}
String policyString = message.substring(7, spaceIndex);
try {
return Integer.parseInt(policyString);
} catch (NumberFormatException e) {
return 0;
}
}
/** Like parsePolicyFromMessage(), but returns the violation. */
private static int parseViolationFromMessage(String message) {
if (message == null) {
return 0;
}
int violationIndex = message.indexOf("violation=");
if (violationIndex == -1) {
return 0;
}
int numberStartIndex = violationIndex + "violation=".length();
int numberEndIndex = message.indexOf(' ', numberStartIndex);
if (numberEndIndex == -1) {
numberEndIndex = message.length();
}
String violationString = message.substring(numberStartIndex, numberEndIndex);
try {
return Integer.parseInt(violationString);
} catch (NumberFormatException e) {
return 0;
}
}
private static final ThreadLocal This catches disk and network access on the main thread, as well as leaked SQLite cursors
* and unclosed resources. This is simply a wrapper around {@link #setVmPolicy} and {@link
* #setThreadPolicy}.
*/
public static void enableDefaults() {
StrictMode.setThreadPolicy(
new StrictMode.ThreadPolicy.Builder().detectAll().penaltyLog().build());
StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectAll().penaltyLog().build());
}
/** @hide */
public static boolean vmSqliteObjectLeaksEnabled() {
return (sVmPolicy.mask & DETECT_VM_CURSOR_LEAKS) != 0;
}
/** @hide */
public static boolean vmClosableObjectLeaksEnabled() {
return (sVmPolicy.mask & DETECT_VM_CLOSABLE_LEAKS) != 0;
}
/** @hide */
public static boolean vmRegistrationLeaksEnabled() {
return (sVmPolicy.mask & DETECT_VM_REGISTRATION_LEAKS) != 0;
}
/** @hide */
public static boolean vmFileUriExposureEnabled() {
return (sVmPolicy.mask & DETECT_VM_FILE_URI_EXPOSURE) != 0;
}
/** @hide */
public static boolean vmCleartextNetworkEnabled() {
return (sVmPolicy.mask & DETECT_VM_CLEARTEXT_NETWORK) != 0;
}
/** @hide */
public static boolean vmContentUriWithoutPermissionEnabled() {
return (sVmPolicy.mask & DETECT_VM_CONTENT_URI_WITHOUT_PERMISSION) != 0;
}
/** @hide */
public static boolean vmUntaggedSocketEnabled() {
return (sVmPolicy.mask & DETECT_VM_UNTAGGED_SOCKET) != 0;
}
/** @hide */
public static void onSqliteObjectLeaked(String message, Throwable originStack) {
onVmPolicyViolation(message, originStack);
}
/** @hide */
public static void onWebViewMethodCalledOnWrongThread(Throwable originStack) {
onVmPolicyViolation(null, originStack);
}
/** @hide */
public static void onIntentReceiverLeaked(Throwable originStack) {
onVmPolicyViolation(null, originStack);
}
/** @hide */
public static void onServiceConnectionLeaked(Throwable originStack) {
onVmPolicyViolation(null, originStack);
}
/** @hide */
public static void onFileUriExposed(Uri uri, String location) {
final String message = uri + " exposed beyond app through " + location;
if ((sVmPolicy.mask & PENALTY_DEATH_ON_FILE_URI_EXPOSURE) != 0) {
throw new FileUriExposedException(message);
} else {
onVmPolicyViolation(null, new Throwable(message));
}
}
/** @hide */
public static void onContentUriWithoutPermission(Uri uri, String location) {
final String message =
uri
+ " exposed beyond app through "
+ location
+ " without permission grant flags; did you forget"
+ " FLAG_GRANT_READ_URI_PERMISSION?";
onVmPolicyViolation(null, new Throwable(message));
}
/** @hide */
public static final String CLEARTEXT_DETECTED_MSG =
"Detected cleartext network traffic from UID ";
/** @hide */
public static void onCleartextNetworkDetected(byte[] firstPacket) {
byte[] rawAddr = null;
if (firstPacket != null) {
if (firstPacket.length >= 20 && (firstPacket[0] & 0xf0) == 0x40) {
// IPv4
rawAddr = new byte[4];
System.arraycopy(firstPacket, 16, rawAddr, 0, 4);
} else if (firstPacket.length >= 40 && (firstPacket[0] & 0xf0) == 0x60) {
// IPv6
rawAddr = new byte[16];
System.arraycopy(firstPacket, 24, rawAddr, 0, 16);
}
}
final int uid = android.os.Process.myUid();
String msg = CLEARTEXT_DETECTED_MSG + uid;
if (rawAddr != null) {
try {
msg += " to " + InetAddress.getByAddress(rawAddr);
} catch (UnknownHostException ignored) {
}
}
final boolean forceDeath = (sVmPolicy.mask & PENALTY_DEATH_ON_CLEARTEXT_NETWORK) != 0;
onVmPolicyViolation(
HexDump.dumpHexString(firstPacket).trim(), new Throwable(msg), forceDeath);
}
/** @hide */
public static final String UNTAGGED_SOCKET_VIOLATION_MESSAGE =
"Untagged socket detected; use"
+ " TrafficStats.setThreadSocketTag() to track all network usage";
/** @hide */
public static void onUntaggedSocket() {
onVmPolicyViolation(null, new Throwable(UNTAGGED_SOCKET_VIOLATION_MESSAGE));
}
// Map from VM violation fingerprint to uptime millis.
private static final HashMap The object itself is a linked list node, to avoid any allocations during rapid span
* entries and exits.
*
* @hide
*/
public static class Span {
private String mName;
private long mCreateMillis;
private Span mNext;
private Span mPrev; // not used when in freeList, only active
private final ThreadSpanState mContainerState;
Span(ThreadSpanState threadState) {
mContainerState = threadState;
}
// Empty constructor for the NO_OP_SPAN
protected Span() {
mContainerState = null;
}
/**
* To be called when the critical span is complete (i.e. the animation is done animating).
* This can be called on any thread (even a different one from where the animation was
* taking place), but that's only a defensive implementation measure. It really makes no
* sense for you to call this on thread other than that where you created it.
*
* @hide
*/
public void finish() {
ThreadSpanState state = mContainerState;
synchronized (state) {
if (mName == null) {
// Duplicate finish call. Ignore.
return;
}
// Remove ourselves from the active list.
if (mPrev != null) {
mPrev.mNext = mNext;
}
if (mNext != null) {
mNext.mPrev = mPrev;
}
if (state.mActiveHead == this) {
state.mActiveHead = mNext;
}
state.mActiveSize--;
if (LOG_V) Log.d(TAG, "Span finished=" + mName + "; size=" + state.mActiveSize);
this.mCreateMillis = -1;
this.mName = null;
this.mPrev = null;
this.mNext = null;
// Add ourselves to the freeList, if it's not already
// too big.
if (state.mFreeListSize < 5) {
this.mNext = state.mFreeListHead;
state.mFreeListHead = this;
state.mFreeListSize++;
}
}
}
}
// The no-op span that's used in user builds.
private static final Span NO_OP_SPAN =
new Span() {
public void finish() {
// Do nothing.
}
};
/**
* Linked lists of active spans and a freelist.
*
* Locking notes: there's one of these structures per thread and all members of this
* structure (as well as the Span nodes under it) are guarded by the ThreadSpanState object
* instance. While in theory there'd be no locking required because it's all local per-thread,
* the finish() method above is defensive against people calling it on a different thread from
* where they created the Span, hence the locking.
*/
private static class ThreadSpanState {
public Span mActiveHead; // doubly-linked list.
public int mActiveSize;
public Span mFreeListHead; // singly-linked list. only changes at head.
public int mFreeListSize;
}
private static final ThreadLocal The name is an arbitary label (or tag) that will be applied to any strictmode violation
* that happens while this span is active. You must call finish() on the span when done.
*
* This will never return null, but on devices without debugging enabled, this may return a
* dummy object on which the finish() method is a no-op.
*
* TODO: add CloseGuard to this, verifying callers call finish.
*
* @hide
*/
public static Span enterCriticalSpan(String name) {
if (Build.IS_USER) {
return NO_OP_SPAN;
}
if (name == null || name.isEmpty()) {
throw new IllegalArgumentException("name must be non-null and non-empty");
}
ThreadSpanState state = sThisThreadSpanState.get();
Span span = null;
synchronized (state) {
if (state.mFreeListHead != null) {
span = state.mFreeListHead;
state.mFreeListHead = span.mNext;
state.mFreeListSize--;
} else {
// Shouldn't have to do this often.
span = new Span(state);
}
span.mName = name;
span.mCreateMillis = SystemClock.uptimeMillis();
span.mNext = state.mActiveHead;
span.mPrev = null;
state.mActiveHead = span;
state.mActiveSize++;
if (span.mNext != null) {
span.mNext.mPrev = span;
}
if (LOG_V) Log.d(TAG, "Span enter=" + name + "; size=" + state.mActiveSize);
}
return span;
}
/**
* For code to note that it's slow. This is a no-op unless the current thread's {@link
* android.os.StrictMode.ThreadPolicy} has {@link
* android.os.StrictMode.ThreadPolicy.Builder#detectCustomSlowCalls} enabled.
*
* @param name a short string for the exception stack trace that's built if when this fires.
*/
public static void noteSlowCall(String name) {
BlockGuard.Policy policy = BlockGuard.getThreadPolicy();
if (!(policy instanceof AndroidBlockGuardPolicy)) {
// StrictMode not enabled.
return;
}
((AndroidBlockGuardPolicy) policy).onCustomSlowCall(name);
}
/**
* For code to note that a resource was obtained using a type other than its defined type. This
* is a no-op unless the current thread's {@link android.os.StrictMode.ThreadPolicy} has {@link
* android.os.StrictMode.ThreadPolicy.Builder#detectResourceMismatches()} enabled.
*
* @param tag an object for the exception stack trace that's built if when this fires.
* @hide
*/
public static void noteResourceMismatch(Object tag) {
BlockGuard.Policy policy = BlockGuard.getThreadPolicy();
if (!(policy instanceof AndroidBlockGuardPolicy)) {
// StrictMode not enabled.
return;
}
((AndroidBlockGuardPolicy) policy).onResourceMismatch(tag);
}
/** @hide */
public static void noteUnbufferedIO() {
BlockGuard.Policy policy = BlockGuard.getThreadPolicy();
if (!(policy instanceof AndroidBlockGuardPolicy)) {
// StrictMode not enabled.
return;
}
((AndroidBlockGuardPolicy) policy).onUnbufferedIO();
}
/** @hide */
public static void noteDiskRead() {
BlockGuard.Policy policy = BlockGuard.getThreadPolicy();
if (!(policy instanceof AndroidBlockGuardPolicy)) {
// StrictMode not enabled.
return;
}
((AndroidBlockGuardPolicy) policy).onReadFromDisk();
}
/** @hide */
public static void noteDiskWrite() {
BlockGuard.Policy policy = BlockGuard.getThreadPolicy();
if (!(policy instanceof AndroidBlockGuardPolicy)) {
// StrictMode not enabled.
return;
}
((AndroidBlockGuardPolicy) policy).onWriteToDisk();
}
// Guarded by StrictMode.class
private static final HashMap
* StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
* .detectAll()
* .penaltyLog()
* .build();
* StrictMode.setThreadPolicy(policy);
*
*/
public static final class Builder {
private int mMask = 0;
/**
* Create a Builder that detects nothing and has no violations. (but note that {@link
* #build} will default to enabling {@link #penaltyLog} if no other penalties are
* specified)
*/
public Builder() {
mMask = 0;
}
/** Initialize a Builder from an existing ThreadPolicy. */
public Builder(ThreadPolicy policy) {
mMask = policy.mask;
}
/**
* Detect everything that's potentially suspect.
*
* build, {@link
* #penaltyLog} is implicitly set.
*/
public ThreadPolicy build() {
// If there are detection bits set but no violation bits
// set, enable simple logging.
if (mMask != 0
&& (mMask
& (PENALTY_DEATH
| PENALTY_LOG
| PENALTY_DROPBOX
| PENALTY_DIALOG))
== 0) {
penaltyLog();
}
return new ThreadPolicy(mMask);
}
}
}
/**
* {@link StrictMode} policy applied to all threads in the virtual machine's process.
*
*
* StrictMode.VmPolicy policy = new StrictMode.VmPolicy.Builder()
* .detectAll()
* .penaltyLog()
* .build();
* StrictMode.setVmPolicy(policy);
*
*/
public static final class Builder {
private int mMask;
private HashMapbuild, {@link
* #penaltyLog} is implicitly set.
*/
public VmPolicy build() {
// If there are detection bits set but no violation bits
// set, enable simple logging.
if (mMask != 0
&& (mMask
& (PENALTY_DEATH
| PENALTY_LOG
| PENALTY_DROPBOX
| PENALTY_DIALOG))
== 0) {
penaltyLog();
}
return new VmPolicy(
mMask,
mClassInstanceLimit != null ? mClassInstanceLimit : EMPTY_CLASS_LIMIT_MAP);
}
}
}
/**
* Log of strict mode violation stack traces that have occurred during a Binder call, to be
* serialized back later to the caller via Parcel.writeNoException() (amusingly) where the
* caller can choose how to react.
*/
private static final ThreadLocal