Trim the activity info of another uid if no privilege

The activity info could be from another uid which is different
from the app that hosts the task. The information should be
trimmed if the caller app doesn't have the privilege.

Bug: 243130512
Test: verified locally
Test: atest RecentTasksTest
Change-Id: Ia343ac70e5bb9aeae718fca6674e1ca491a14512
(cherry picked from commit 401e782b244bf84fd5aab371f60c2e52d6226fb3)
Merged-In: Ia343ac70e5bb9aeae718fca6674e1ca491a14512

5 files changed, 54 insertions, 8 deletions

diff --git a/services/core/java/com/android/server/wm/AppTaskImpl.java b/services/core/java/com/android/server/wm/AppTaskImpl.java
index e80c2607a0ad..0bfc48b4b54c 100644
--- a/services/core/java/com/android/server/wm/AppTaskImpl.java
+++ b/services/core/java/com/android/server/wm/AppTaskImpl.java
@@ -98,7 +98,7 @@ class AppTaskImpl extends IAppTask.Stub {
                     throw new IllegalArgumentException("Unable to find task ID " + mTaskId);
                 }
                 return mService.getRecentTasks().createRecentTaskInfo(task,
-                        false /* stripExtras */);
+                        false /* stripExtras */, true /* getTasksAllowed */);
             } finally {
                 Binder.restoreCallingIdentity(origId);
             }
diff --git a/services/core/java/com/android/server/wm/RecentTasks.java b/services/core/java/com/android/server/wm/RecentTasks.java
index 4860762a5f7f..1fc061b2ca78 100644
--- a/services/core/java/com/android/server/wm/RecentTasks.java
+++ b/services/core/java/com/android/server/wm/RecentTasks.java
@@ -976,7 +976,7 @@ class RecentTasks {
                 continue;
             }
 
-            res.add(createRecentTaskInfo(task, true /* stripExtras */));
+            res.add(createRecentTaskInfo(task, true /* stripExtras */, getTasksAllowed));
         }
         return res;
     }
@@ -1895,7 +1895,8 @@ class RecentTasks {
     /**
      * Creates a new RecentTaskInfo from a Task.
      */
-    ActivityManager.RecentTaskInfo createRecentTaskInfo(Task tr, boolean stripExtras) {
+    ActivityManager.RecentTaskInfo createRecentTaskInfo(Task tr, boolean stripExtras,
+            boolean getTasksAllowed) {
         final ActivityManager.RecentTaskInfo rti = new ActivityManager.RecentTaskInfo();
         // If the recent Task is detached, we consider it will be re-attached to the default
         // TaskDisplayArea because we currently only support recent overview in the default TDA.
@@ -1907,6 +1908,9 @@ class RecentTasks {
         rti.id = rti.isRunning ? rti.taskId : INVALID_TASK_ID;
         rti.persistentId = rti.taskId;
         rti.lastSnapshotData.set(tr.mLastTaskSnapshotData);
+        if (!getTasksAllowed) {
+            Task.trimIneffectiveInfo(tr, rti);
+        }
 
         // Fill in organized child task info for the task created by organizer.
         if (tr.mCreatedByOrganizer) {
diff --git a/services/core/java/com/android/server/wm/RunningTasks.java b/services/core/java/com/android/server/wm/RunningTasks.java
index 120fec0fe0e6..0e60274ba381 100644
--- a/services/core/java/com/android/server/wm/RunningTasks.java
+++ b/services/core/java/com/android/server/wm/RunningTasks.java
@@ -142,6 +142,10 @@ class RunningTasks {
         task.fillTaskInfo(rti, !mKeepIntentExtra);
         // Fill in some deprecated values
         rti.id = rti.taskId;
+
+        if (!mAllowed) {
+            Task.trimIneffectiveInfo(task, rti);
+        }
         return rti;
     }
 }
diff --git a/services/core/java/com/android/server/wm/Task.java b/services/core/java/com/android/server/wm/Task.java
index 5806f7917bab..ea6f2442a919 100644
--- a/services/core/java/com/android/server/wm/Task.java
+++ b/services/core/java/com/android/server/wm/Task.java
@@ -3467,6 +3467,27 @@ class Task extends TaskFragment {
         info.isSleeping = shouldSleepActivities();
     }
 
+    /**
+     * Removes the activity info if the activity belongs to a different uid, which is
+     * different from the app that hosts the task.
+     */
+    static void trimIneffectiveInfo(Task task, TaskInfo info) {
+        final ActivityRecord baseActivity = task.getActivity(r -> !r.finishing,
+                false /* traverseTopToBottom */);
+        final int baseActivityUid =
+                baseActivity != null ? baseActivity.getUid() : task.effectiveUid;
+
+        if (info.topActivityInfo != null
+                && task.effectiveUid != info.topActivityInfo.applicationInfo.uid) {
+            info.topActivity = null;
+            info.topActivityInfo = null;
+        }
+
+        if (task.effectiveUid != baseActivityUid) {
+            info.baseActivity = null;
+        }
+    }
+
     @Nullable PictureInPictureParams getPictureInPictureParams() {
         final Task topTask = getTopMostTask();
         if (topTask == null) return null;
diff --git a/services/tests/wmtests/src/com/android/server/wm/RecentTasksTest.java b/services/tests/wmtests/src/com/android/server/wm/RecentTasksTest.java
index adf694c2a88d..0462e1be7a5f 100644
--- a/services/tests/wmtests/src/com/android/server/wm/RecentTasksTest.java
+++ b/services/tests/wmtests/src/com/android/server/wm/RecentTasksTest.java
@@ -30,6 +30,7 @@ import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
 import static android.content.pm.ActivityInfo.LAUNCH_MULTIPLE;
 import static android.content.pm.ActivityInfo.LAUNCH_SINGLE_INSTANCE;
 import static android.content.res.Configuration.ORIENTATION_PORTRAIT;
+import static android.os.Process.NOBODY_UID;
 
 import static com.android.dx.mockito.inline.extended.ExtendedMockito.doNothing;
 import static com.android.dx.mockito.inline.extended.ExtendedMockito.doReturn;
@@ -1220,20 +1221,34 @@ public class RecentTasksTest extends WindowTestsBase {
 
     @Test
     public void testCreateRecentTaskInfo_detachedTask() {
-        final Task task = createTaskBuilder(".Task").setCreateActivity(true).build();
+        final Task task = createTaskBuilder(".Task").build();
+        new ActivityBuilder(mSupervisor.mService)
+                .setTask(task)
+                .setUid(NOBODY_UID)
+                .setComponent(getUniqueComponentName())
+                .build();
         final TaskDisplayArea tda = task.getDisplayArea();
 
         assertTrue(task.isAttached());
         assertTrue(task.supportsMultiWindow());
 
-        RecentTaskInfo info = mRecentTasks.createRecentTaskInfo(task, true);
+        RecentTaskInfo info = mRecentTasks.createRecentTaskInfo(task, true /* stripExtras */,
+                true /* getTasksAllowed */);
 
         assertTrue(info.supportsMultiWindow);
 
+        info = mRecentTasks.createRecentTaskInfo(task, true /* stripExtras */,
+                false /* getTasksAllowed */);
+
+        assertTrue(info.topActivity == null);
+        assertTrue(info.topActivityInfo == null);
+        assertTrue(info.baseActivity == null);
+
         // The task can be put in split screen even if it is not attached now.
         task.removeImmediately();
 
-        info = mRecentTasks.createRecentTaskInfo(task, true);
+        info = mRecentTasks.createRecentTaskInfo(task, true /* stripExtras */,
+                true /* getTasksAllowed */);
 
         assertTrue(info.supportsMultiWindow);
 
@@ -1242,7 +1257,8 @@ public class RecentTasksTest extends WindowTestsBase {
         doReturn(false).when(tda).supportsNonResizableMultiWindow();
         doReturn(false).when(task).isResizeable();
 
-        info = mRecentTasks.createRecentTaskInfo(task, true);
+        info = mRecentTasks.createRecentTaskInfo(task, true /* stripExtras */,
+                true /* getTasksAllowed */);
 
         assertFalse(info.supportsMultiWindow);
 
@@ -1250,7 +1266,8 @@ public class RecentTasksTest extends WindowTestsBase {
         // the device supports it.
         doReturn(true).when(tda).supportsNonResizableMultiWindow();
 
-        info = mRecentTasks.createRecentTaskInfo(task, true);
+        info = mRecentTasks.createRecentTaskInfo(task, true /* stripExtras */,
+                true /* getTasksAllowed */);
 
         assertTrue(info.supportsMultiWindow);
     }