diff --git a/core/java/android/window/TaskFragmentInfo.java b/core/java/android/window/TaskFragmentInfo.java
index f864c91be31f8..6d4a2f130129b 100644
--- a/core/java/android/window/TaskFragmentInfo.java
+++ b/core/java/android/window/TaskFragmentInfo.java
@@ -25,6 +25,9 @@ import android.os.IBinder;
 import android.os.Parcel;
 import android.os.Parcelable;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Stores information about a particular TaskFragment.
  * @hide
@@ -50,9 +53,16 @@ public final class TaskFragmentInfo implements Parcelable {
     /** Whether this TaskFragment is visible on the window hierarchy. */
     private final boolean mIsVisible;
 
+    /**
+     * List of Activity tokens that are children of this TaskFragment. It only contains Activities
+     * that belong to the organizer process for security.
+     */
+    private final List<IBinder> mActivities = new ArrayList<>();
+
     public TaskFragmentInfo(
             @NonNull IBinder fragmentToken, @NonNull WindowContainerToken token,
-            @NonNull Configuration configuration, boolean isEmpty, boolean isVisible) {
+            @NonNull Configuration configuration, boolean isEmpty, boolean isVisible,
+            List<IBinder> activities) {
         if (fragmentToken == null) {
             throw new IllegalArgumentException("Invalid TaskFragmentInfo.");
         }
@@ -61,6 +71,7 @@ public final class TaskFragmentInfo implements Parcelable {
         mConfiguration.setTo(configuration);
         mIsEmpty = isEmpty;
         mIsVisible = isVisible;
+        mActivities.addAll(activities);
     }
 
     public IBinder getFragmentToken() {
@@ -83,6 +94,10 @@ public final class TaskFragmentInfo implements Parcelable {
         return mIsVisible;
     }
 
+    public List<IBinder> getActivities() {
+        return mActivities;
+    }
+
     @WindowingMode
     public int getWindowingMode() {
         return mConfiguration.windowConfiguration.getWindowingMode();
@@ -101,7 +116,8 @@ public final class TaskFragmentInfo implements Parcelable {
                 && mToken.equals(that.mToken)
                 && mIsEmpty == that.mIsEmpty
                 && mIsVisible == that.mIsVisible
-                && getWindowingMode() == that.getWindowingMode();
+                && getWindowingMode() == that.getWindowingMode()
+                && mActivities.equals(that.mActivities);
     }
 
     private TaskFragmentInfo(Parcel in) {
@@ -110,6 +126,7 @@ public final class TaskFragmentInfo implements Parcelable {
         mConfiguration.readFromParcel(in);
         mIsEmpty = in.readBoolean();
         mIsVisible = in.readBoolean();
+        in.readBinderList(mActivities);
     }
 
     @Override
@@ -119,6 +136,7 @@ public final class TaskFragmentInfo implements Parcelable {
         mConfiguration.writeToParcel(dest, flags);
         dest.writeBoolean(mIsEmpty);
         dest.writeBoolean(mIsVisible);
+        dest.writeBinderList(mActivities);
     }
 
     @NonNull
diff --git a/services/core/java/com/android/server/wm/TaskFragment.java b/services/core/java/com/android/server/wm/TaskFragment.java
index 25d30336e0e71..65e10b8477e62 100644
--- a/services/core/java/com/android/server/wm/TaskFragment.java
+++ b/services/core/java/com/android/server/wm/TaskFragment.java
@@ -205,6 +205,13 @@ class TaskFragment extends WindowContainer<WindowContainer> {
     @Nullable
     private IBinder mFragmentToken;
 
+    /**
+     * The PID of the organizer that created this TaskFragment. It should be the same as the PID
+     * of {@link android.window.TaskFragmentCreationParams#getOwnerToken()}.
+     * {@link ActivityRecord#INVALID_PID} if this is not an organizer-created TaskFragment.
+     */
+    private int mTaskFragmentOrganizerPid = ActivityRecord.INVALID_PID;
+
     private final Rect mTmpInsets = new Rect();
     private final Rect mTmpBounds = new Rect();
     private final Rect mTmpFullBounds = new Rect();
@@ -271,8 +278,9 @@ class TaskFragment extends WindowContainer<WindowContainer> {
         taskFragment.mAdjacentTaskFragment = this;
     }
 
-    void setTaskFragmentOrganizer(ITaskFragmentOrganizer organizer) {
+    void setTaskFragmentOrganizer(ITaskFragmentOrganizer organizer, int pid) {
         mTaskFragmentOrganizer = organizer;
+        mTaskFragmentOrganizerPid = pid;
     }
 
     TaskFragment getAdjacentTaskFragment() {
@@ -1991,12 +1999,23 @@ class TaskFragment extends WindowContainer<WindowContainer> {
      * called from {@link Task}.
      */
     TaskFragmentInfo getTaskFragmentInfo() {
+        List<IBinder> childActivities = new ArrayList<>();
+        for (int i = 0; i < getChildCount(); i++) {
+            WindowContainer wc = getChildAt(i);
+            if (mTaskFragmentOrganizerPid != ActivityRecord.INVALID_PID
+                    && wc.asActivityRecord() != null
+                    && wc.asActivityRecord().getPid() == mTaskFragmentOrganizerPid) {
+                // Only includes Activities that belong to the organizer process for security.
+                childActivities.add(wc.asActivityRecord().appToken);
+            }
+        }
         return new TaskFragmentInfo(
                 mFragmentToken,
                 mRemoteToken.toWindowContainerToken(),
                 getConfiguration(),
                 getChildCount() == 0,
-                isVisible());
+                isVisible(),
+                childActivities);
     }
 
     @Nullable
diff --git a/services/core/java/com/android/server/wm/WindowOrganizerController.java b/services/core/java/com/android/server/wm/WindowOrganizerController.java
index eeb83c66ce2bf..8dae839051fac 100644
--- a/services/core/java/com/android/server/wm/WindowOrganizerController.java
+++ b/services/core/java/com/android/server/wm/WindowOrganizerController.java
@@ -924,7 +924,8 @@ class WindowOrganizerController extends IWindowOrganizerController.Stub
         ownerActivity.getTask().addChild(taskFragment, POSITION_TOP);
         taskFragment.setWindowingMode(creationParams.getWindowingMode());
         taskFragment.setBounds(creationParams.getInitialBounds());
-        taskFragment.setTaskFragmentOrganizer(creationParams.getOrganizer());
+        taskFragment.setTaskFragmentOrganizer(
+                creationParams.getOrganizer(), ownerActivity.getPid());
         mLaunchTaskFragments.put(creationParams.getFragmentToken(), taskFragment);
     }