Strip part of 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.

However, removing the entire info may result in app compatibility
issues. So, only swiping the info that are sensitive to empty
string.

Bug: 243130512
Test: verified market app locally
Test: atest RecentTasksTest
Change-Id: I5b6775dd3c4e2ccdacd30741884d336b2eaa70da
(cherry picked from commit 5ba72200f6a66b5da48c9c3abd103a73aea1ef95)
Merged-In: I5b6775dd3c4e2ccdacd30741884d336b2eaa70da

5 files changed, 82 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..a259baae1277 100644
--- a/services/core/java/com/android/server/wm/Task.java
+++ b/services/core/java/com/android/server/wm/Task.java
@@ -3467,6 +3467,54 @@ 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) {
+            // Making a copy to prevent eliminating the info in the original ActivityRecord.
+            info.topActivityInfo = new ActivityInfo(info.topActivityInfo);
+            info.topActivityInfo.applicationInfo =
+                    new ApplicationInfo(info.topActivityInfo.applicationInfo);
+
+            // Strip the sensitive info.
+            info.topActivity = new ComponentName("", "");
+            info.topActivityInfo.packageName = "";
+            info.topActivityInfo.taskAffinity = "";
+            info.topActivityInfo.processName = "";
+            info.topActivityInfo.name = "";
+            info.topActivityInfo.parentActivityName = "";
+            info.topActivityInfo.targetActivity = "";
+            info.topActivityInfo.splitName = "";
+            info.topActivityInfo.applicationInfo.className = "";
+            info.topActivityInfo.applicationInfo.credentialProtectedDataDir = "";
+            info.topActivityInfo.applicationInfo.dataDir = "";
+            info.topActivityInfo.applicationInfo.deviceProtectedDataDir = "";
+            info.topActivityInfo.applicationInfo.manageSpaceActivityName = "";
+            info.topActivityInfo.applicationInfo.nativeLibraryDir = "";
+            info.topActivityInfo.applicationInfo.nativeLibraryRootDir = "";
+            info.topActivityInfo.applicationInfo.processName = "";
+            info.topActivityInfo.applicationInfo.publicSourceDir = "";
+            info.topActivityInfo.applicationInfo.scanPublicSourceDir = "";
+            info.topActivityInfo.applicationInfo.scanSourceDir = "";
+            info.topActivityInfo.applicationInfo.sourceDir = "";
+            info.topActivityInfo.applicationInfo.taskAffinity = "";
+            info.topActivityInfo.applicationInfo.name = "";
+            info.topActivityInfo.applicationInfo.packageName = "";
+        }
+
+        if (task.effectiveUid != baseActivityUid) {
+            info.baseActivity = new ComponentName("", "");
+        }
+    }
+
     @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..db6ac0b432b3 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 +1221,35 @@ public class RecentTasksTest extends WindowTestsBase {
 
     @Test
     public void testCreateRecentTaskInfo_detachedTask() {
-        final Task task = createTaskBuilder(".Task").setCreateActivity(true).build();
+        final Task task = createTaskBuilder(".Task").build();
+        final ComponentName componentName = getUniqueComponentName();
+        new ActivityBuilder(mSupervisor.mService)
+                .setTask(task)
+                .setUid(NOBODY_UID)
+                .setComponent(componentName)
+                .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 */);
+
+        assertFalse(info.topActivity.equals(componentName));
+        assertFalse(info.topActivityInfo.packageName.equals(componentName.getPackageName()));
+        assertFalse(info.baseActivity.equals(componentName));
+
         // 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 +1258,8 @@ 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 +1267,8 @@ 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);
     }