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Commit 48d8d370 authored by Riddle Hsu's avatar Riddle Hsu
Browse files

RESTRICT AUTOMERGE Create separated tasks for different apps from startActivities 

Assume there are 2 applications A, B with different uids.
There are 4 activities A1, A2, B1, B2 with default task
affinity and launch mode.

After A1 called startActivities(B1, A2, B2):
 Original   : Task(A1, B1, A2, B2)
 This Change: Task(A1, B1), Task(A2, B2)
In other words, the source caller cannot launch its activity
above the activity of other application in the same task, and
it can still launch activity of other application in its task.

Bug: 145669109
Test: atest StartActivityTests# \
      testStartActivitiesWithDiffUidNotInSameTask
Change-Id: I97bd875146a52f62b8fe82235487ccefb2955e8e
parent 835e3a52

services/core/java/com/android/server/am/ActivityStartController.java

+18 −3
Original line number Diff line number Diff line
@@ -334,6 +334,9 @@ public class ActivityStartController { 
        } else {

            callingPid = callingUid = -1;

        }

        boolean forceNewTask = false;

        final int filterCallingUid = ActivityStarter.computeResolveFilterUid(

                callingUid, realCallingUid, UserHandle.USER_NULL);

        final long origId = Binder.clearCallingIdentity();

        try {

            synchronized (mService) {
@@ -353,11 +356,13 @@ public class ActivityStartController { 


                    // Don't modify the client's object!

                    intent = new Intent(intent);

                    if (forceNewTask) {

                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                    }



                    // Collect information about the target of the Intent.

                    ActivityInfo aInfo = mSupervisor.resolveActivity(intent, resolvedTypes[i], 0,

                            null, userId, ActivityStarter.computeResolveFilterUid(

                                    callingUid, realCallingUid, UserHandle.USER_NULL));

                            null, userId, filterCallingUid);

                    // TODO: New, check if this is correct

                    aInfo = mService.getActivityInfoForUser(aInfo, userId);
@@ -397,7 +402,17 @@ public class ActivityStartController { 
                        return res;

                    }



                    resultTo = outActivity[0] != null ? outActivity[0].appToken : null;

                    final ActivityRecord started = outActivity[0];

                    if (started != null && started.getUid() == filterCallingUid) {

                        // Only the started activity which has the same uid as the source caller can

                        // be the caller of next activity.

                        resultTo = started.appToken;

                        forceNewTask = false;

                    } else {

                        // Different apps not adjacent to the caller are forced to be new task.

                        resultTo = null;

                        forceNewTask = true;

                    }

                }

            }

        } finally {