-
-
Save RikkaW/be3fe4178903702c54ec73b2fc1187fe to your computer and use it in GitHub Desktop.
token = new Binder(); | |
try { | |
Context _context = android.app.ActivityThread.systemMain().getSystemContext(); | |
final Context context = new ContextWrapper(_context) { | |
@Override | |
public Object getSystemService(String name) { | |
if (Context.WINDOW_SERVICE.equals(name)) { | |
WindowManager wm = (WindowManager) super.getSystemService(name); | |
if (wm != null) { | |
((android.view.WindowManagerImpl) wm).setDefaultToken(token); | |
} | |
return wm; | |
} | |
return super.getSystemService(name); | |
} | |
}; | |
context.setTheme(android.R.style.Theme_Material_Light); | |
CharSequence label = context.getPackageManager().getApplicationLabel(context.getPackageManager().getApplicationInfo("com.android.settings", 0)); | |
LogUtils.i("label " + label); | |
android.widget.Toast.makeText(context, "test", Toast.LENGTH_LONG).show(); | |
LogUtils.i("toast"); | |
android.view.WindowManager wm = context.getSystemService(WindowManager.class); | |
LogUtils.i("class: " + wm.getClass().getName()); | |
//((android.view.WindowManagerImpl) wm).setDefaultToken(token); | |
LinearLayout root = new LinearLayout(context); | |
root.setBackground(new ColorDrawable(0xffffffff)); | |
TextView textView = new TextView(context); | |
textView.setText("test"); | |
root.addView(textView); | |
Button button = new Button(context); | |
button.setSoundEffectsEnabled(false); | |
button.setText("test"); | |
button.setOnClickListener(new View.OnClickListener() { | |
@Override | |
public void onClick(View v) { | |
Toast.makeText(context, "?!", Toast.LENGTH_LONG).show(); | |
} | |
}); | |
root.addView(button); | |
WindowManager.LayoutParams params = new WindowManager.LayoutParams( | |
WindowManager.LayoutParams.WRAP_CONTENT, | |
WindowManager.LayoutParams.WRAP_CONTENT, | |
WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG, | |
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL, | |
PixelFormat.TRANSLUCENT); | |
params.gravity = Gravity.CENTER; | |
params.x = 0; | |
params.y = 0; | |
wm.addView(root, params); | |
} catch (Throwable tr) { | |
LogUtils.e(tr.getMessage(), tr); | |
} |
@RikkaW I have some problems with creating some overlay from process started with app_process
in application sandbox of other app.
I know "window" service is inaccessible from processes started this way, but I am sending IBinder of that service from Activity via AIDL and injecting it to ServiceManager's sCache
manually, so WindowManagerGlobal can access it.
I am trying to create overlay with this code:
public void window(IBinder windowManager) {
try {
Field sCache = Class.forName("android.os.ServiceManager").getDeclaredField("sCache");
sCache.setAccessible(true);
Method m = sCache.getType().getDeclaredMethod("put", Object.class, Object.class);
m.invoke(sCache.get(null), "window", windowManager);
handler.post(() -> {
Context context = ctx;
WindowManager wm = context.getSystemService(WindowManager.class);
Binder token = new Binder();
context = new ContextWrapper(context) {
@Override
public Object getSystemService(String name) {
if (Context.WINDOW_SERVICE.equals(name)) {
WindowManager wm = (WindowManager) super.getSystemService(name);
if (wm != null)
((android.view.WindowManagerImpl) wm).setDefaultToken(token);
return wm;
}
return super.getSystemService(name);
}
};
Button button = new Button(context);
button.setSoundEffectsEnabled(false);
button.setText("test");
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
PixelFormat.TRANSLUCENT);
params.gravity = Gravity.CENTER;
params.x = 0;
params.y = 0;
wm.addView(button, params);
});
} catch (Exception e) {
e.printStackTrace(System.err);
}
}
But I am getting only this unclear exception
android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@e51bfa1 -- permission denied for window type 2038
at android.view.ViewRootImpl.setView(ViewRootImpl.java:1092)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:409)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:109)
at com.termux.x11.CmdEntryPoint.lambda$windowManager$3(CmdEntryPoint.java:269)
at com.termux.x11.CmdEntryPoint.$r8$lambda$MIV7qHiVNsG1buhNHJnI7A8pV3A(CmdEntryPoint.java:0)
at com.termux.x11.CmdEntryPoint$$ExternalSyntheticLambda1.run(R8$$SyntheticClass:0)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at com.termux.x11.CmdEntryPoint.main(CmdEntryPoint.java:62)
at java.lang.reflect.Method.invoke(Native Method)
at com.termux.x11.Loader.main(Loader.java:26)
at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:399)
Both activity I am sending IBinder from and application where I want to start this snippet have "Draw over apps" permission but it does not help.
I tried to make a proxy for IBinder to make my snippet inherit Uid of another application (which owns Activity) with adding this code to ContextWrapper
public UserHandle getUser() {
try {
return (UserHandle) UserHandle.class.getDeclaredMethod("of", int.class).invoke(null, Binder.getCallingUid() / 100000);
} catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
public int getUserId() {
return Binder.getCallingUid() / 100000;
}
and wrapping "window"'s IBinder with
Binder proxy = new Binder() {
IBinder target = (IBinder) Class.forName("android.os.ServiceManager").getDeclaredMethod("getService", String.class).invoke(null, "window");
@Override protected boolean onTransact(int code, Parcel data, Parcel reply, int flags) throws RemoteException {
return target.transact(code, data, reply, flags);
}
};
But it does not seem to work, I am getting the same exception.
Seems like I found a reason in system-wide logcat.
03-26 13:39:36.231 536 2972 E AppOps : noteOperation
03-26 13:39:36.231 536 2972 E AppOps : java.lang.SecurityException: Specified package android under uid 10162 but it is really 1000
03-26 13:39:36.231 536 2972 E AppOps : at com.android.server.appop.AppOpsService.verifyAndGetBypass(AppOpsService.java:3874)
03-26 13:39:36.231 536 2972 E AppOps : at com.android.server.appop.AppOpsService.noteOperationUnchecked(AppOpsService.java:3030)
03-26 13:39:36.231 536 2972 E AppOps : at com.android.server.appop.AppOpsService.noteOperationImpl(AppOpsService.java:3018)
03-26 13:39:36.231 536 2972 E AppOps : at com.android.server.appop.AppOpsService.noteOperation(AppOpsService.java:3001)
03-26 13:39:36.231 536 2972 E AppOps : at android.app.AppOpsManager.noteOpNoThrow(AppOpsManager.java:7382)
03-26 13:39:36.231 536 2972 E AppOps : at com.android.server.policy.PhoneWindowManager.checkAddPermission(PhoneWindowManager.java:2150)
03-26 13:39:36.231 536 2972 E AppOps : at com.android.server.wm.WindowManagerService.addWindow(WindowManagerService.java:1383)
03-26 13:39:36.231 536 2972 E AppOps : at com.android.server.wm.Session.addToDisplayAsUser(Session.java:176)
03-26 13:39:36.231 536 2972 E AppOps : at android.view.IWindowSession$Stub.onTransact(IWindowSession.java:679)
03-26 13:39:36.231 536 2972 E AppOps : at com.android.server.wm.Session.onTransact(Session.java:139)
03-26 13:39:36.231 536 2972 E AppOps : at android.os.Binder.execTransactInternal(Binder.java:1154)
03-26 13:39:36.231 536 2972 E AppOps : at android.os.Binder.execTransact(Binder.java:1123)
Ok, I figured it out.
public void windowManager(IBinder binder) {
try {
Field sCache = Class.forName("android.os.ServiceManager").getDeclaredField("sCache");
sCache.setAccessible(true);
Method m = sCache.getType().getDeclaredMethod("put", Object.class, Object.class);
m.invoke(sCache.get(null), "window", binder);
handler.post(() -> {
Context context = android.app.ActivityThread.systemMain().getSystemContext();
WindowManager wm = context.getSystemService(WindowManager.class);
Binder token = new Binder();
context = new ContextWrapper(context) {
@Override
public Object getSystemService(String name) {
if (Context.WINDOW_SERVICE.equals(name)) {
WindowManager wm = (WindowManager) super.getSystemService(name);
if (wm != null)
((android.view.WindowManagerImpl) wm).setDefaultToken(token);
return wm;
}
return super.getSystemService(name);
}
@Override
public Looper getMainLooper() {
return Looper.myLooper();
}
};
View view = new View(context) {
final Paint paint = new Paint();
@Override
protected void onDraw(@NonNull Canvas canvas) {
super.onDraw(canvas);
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.RED);
canvas.drawRect(0, 0, getWidth(), getHeight(), paint);
}
};
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
100, 100, WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
PixelFormat.OPAQUE);
params.gravity = Gravity.CENTER;
params.x = 0;
params.y = 0;
params.packageName = "com.termux";
wm.addView(view, params);
});
} catch (Exception e) {
e.printStackTrace(System.err);
}
}
And it works on Android 11.
Thanks @RikkaW.
And unfortunately I am getting this on Android 12.
java.lang.NullPointerException
at android.os.Parcel.createExceptionOrNull(Parcel.java:2431)
at android.os.Parcel.createException(Parcel.java:2409)
at android.os.Parcel.readException(Parcel.java:2392)
at android.os.Parcel.readException(Parcel.java:2334)
at com.android.internal.app.IAppOpsService$Stub$Proxy.reportRuntimeAppOpAccessMessageAndGetConfig(IAppOpsService.java:1666)
at android.app.AppOpsManager$1.reportStackTraceIfNeeded(AppOpsManager.java:290)
at android.app.AppOpsManager$1.onNoted(AppOpsManager.java:265)
at android.app.AppOpsManager.readAndLogNotedAppops(AppOpsManager.java:9359)
at android.os.Parcel.readExceptionCode(Parcel.java:2356)
at android.os.Parcel.readException(Parcel.java:2331)
at android.view.IWindowSession$Stub$Proxy.addToDisplayAsUser(IWindowSession.java:1374)
at android.view.ViewRootImpl.setView(ViewRootImpl.java:1119)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:399)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:133)
at com.termux.x11.CmdEntryPoint.lambda$windowManager$3(CmdEntryPoint.java:286)
at com.termux.x11.CmdEntryPoint.$r8$lambda$MIV7qHiVNsG1buhNHJnI7A8pV3A(CmdEntryPoint.java:0)
at com.termux.x11.CmdEntryPoint$$ExternalSyntheticLambda1.run(R8$$SyntheticClass:0)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at com.termux.x11.CmdEntryPoint.main(CmdEntryPoint.java:71)
at java.lang.reflect.Method.invoke(Native Method)
at com.termux.x11.Loader.main(Loader.java:26)
at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:355)
Caused by: android.os.RemoteException: Remote stack trace:
at com.android.internal.util.AnnotationValidations.validate(AnnotationValidations.java:129)
at android.app.SyncNotedAppOp.<init>(SyncNotedAppOp.java:227)
at android.app.SyncNotedAppOp$1.createFromParcel(SyncNotedAppOp.java:243)
at android.app.SyncNotedAppOp$1.createFromParcel(SyncNotedAppOp.java:235)
at com.android.internal.app.IAppOpsService$Stub.onTransact(IAppOpsService.java:728)
Any suggestions?
Change opPackageName? I don't remember:(
Btw, this will never work starting from Android 14 QPR 3 or Android 15, as addView now checks if the calling process is a valid Android app process.
Maybe there is some workaround for this? The most important thing I need is to draw something as an overlay from background process.
I am not writing viruses. Simply some oems put code to limit GPU performance of background apps.
Maybe SurfaceControl.Transactions?
Thanks @RikkaW for your information and advices.
Such knowledge is completely new to me and it is quite interesting. I sometime play with Android API but since I knew about the
app_process
magic fromscrcpy
tool, I was very impresive. I want to learn more about it and find out what else it can do... but looks there is very few online information for beginers. By following and trying some projects like this, the answers of @twaik and yours help me learn a lot new knowledge about it. Thank you.If posible, I hope you could point me to where to learn and play with aidl API for beginers.