Checks if AccessibilityServiceInfo is within parcelable size.

- If too large when parsing service XMLs then skip this service.
- If too large when a service attempts to update its own info
  then throw an error.

Bug: 261589597
Test: atest AccessibilityServiceInfoTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:553232c29079fbeab28f95307d025c1426aa7142)
Merged-In: Iffc0cd48cc713f7904d68059e141cb7de5a4b906
Change-Id: Iffc0cd48cc713f7904d68059e141cb7de5a4b906

Author: Daniel-Norman

core/java/android/accessibilityservice/AccessibilityService.java

@@ -2523,6 +2523,10 @@ private void sendServiceInfo() {
         IAccessibilityServiceConnection connection =
                 AccessibilityInteractionClient.getInstance(this).getConnection(mConnectionId);
         if (mInfo != null && connection != null) {
+            if (!mInfo.isWithinParcelableSize()) {
+                throw new IllegalStateException(
+                        "Cannot update service info: size is larger than safe parcelable limits.");
+            }
             try {
                 connection.setServiceInfo(mInfo);
                 mInfo = null;

core/java/android/accessibilityservice/AccessibilityServiceInfo.java

@@ -40,6 +40,7 @@
 import android.graphics.drawable.Drawable;
 import android.hardware.fingerprint.FingerprintManager;
 import android.os.Build;
+import android.os.IBinder;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.os.RemoteException;
@@ -1128,6 +1129,15 @@ public int describeContents() {
         return 0;
     }
 
+    /** @hide */
+    public final boolean isWithinParcelableSize() {
+        final Parcel parcel = Parcel.obtain();
+        writeToParcel(parcel, 0);
+        final boolean result = parcel.dataSize() <= IBinder.MAX_IPC_SIZE;
+        parcel.recycle();
+        return result;
+    }
+
     public void writeToParcel(Parcel parcel, int flagz) {
         parcel.writeInt(eventTypes);
         parcel.writeStringArray(packageNames);

services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java

@@ -1848,6 +1848,12 @@ private boolean readInstalledAccessibilityServiceLocked(AccessibilityUserState u
             AccessibilityServiceInfo accessibilityServiceInfo;
             try {
                 accessibilityServiceInfo = new AccessibilityServiceInfo(resolveInfo, mContext);
+                if (!accessibilityServiceInfo.isWithinParcelableSize()) {
+                    Slog.e(LOG_TAG, "Skipping service "
+                            + accessibilityServiceInfo.getResolveInfo().getComponentInfo()
+                            + " because service info size is larger than safe parcelable limits.");
+                    continue;
+                }
                 if (userState.mCrashedServices.contains(serviceInfo.getComponentName())) {
                     // Restore the crashed attribute.
                     accessibilityServiceInfo.crashed = true;