Update stub implementation

app/stub/src/main/java/com/topjohnwu/magisk/StubRootService.java

@@ -0,0 +1,43 @@
+package com.topjohnwu.magisk;
+
+import android.content.Context;
+import android.content.ContextWrapper;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.util.Log;
+
+import java.io.File;
+import java.lang.reflect.Constructor;
+
+public class StubRootService extends ContextWrapper {
+
+    public StubRootService() {
+        super(null);
+    }
+
+    @Override
+    protected void attachBaseContext(Context base) {
+        ClassLoader loader = DynLoad.loadApk(base);
+        if (loader == null)
+            return;
+
+        try {
+            // Create application to get the real root service class
+            var data = DynLoad.createApkData();
+            File apk = StubApk.current(base);
+            PackageManager pm = base.getPackageManager();
+            PackageInfo pkgInfo = pm.getPackageArchiveInfo(apk.getPath(), 0);
+            loader.loadClass(pkgInfo.applicationInfo.className)
+                    .getConstructor(Object.class)
+                    .newInstance(data.getObject());
+
+            // Create the actual RootService and call its attachBaseContext
+            Constructor<?> ctor = data.getRootService().getConstructor(Object.class);
+            ctor.setAccessible(true);
+            Object service = ctor.newInstance(this);
+            DynLoad.attachContext(service, base);
+        } catch (Exception e) {
+            Log.e(StubRootService.class.getSimpleName(), "", e);
+        }
+    }
+}