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Commit d409d186 authored by Jaewan Kim's avatar Jaewan Kim
Browse files

Check caller for sending media key to global priority session 

Prevent sending media key events from the non-system app to the global
priority session through the MediaSessionManager.dispatchMediaKeyEvent().
Note that any app can use the API indirectly with
the public API AudioManager.dispatchMediaKeyEvent().

Bug: 29833954
Tested: Installed malicious apps and confirmed that they don't work.
Tested: Run CtsTelecomTestCases and CtsMediaTestCases
Change-Id: I2a9e78196ba7455324e485f098f095d03b47ee15
parent 7538bb68

services/core/java/com/android/server/media/MediaSessionService.java

+7 −0
Original line number Diff line number Diff line
@@ -767,6 +767,13 @@ public class MediaSessionService extends SystemService implements Monitor { 
                            + "setup is in progress.");

                    return;

                }

                if (isGlobalPriorityActive() && uid != Process.SYSTEM_UID) {

                    // Prevent dispatching key event through reflection while the global priority

                    // session is active.

                    Slog.i(TAG, "Only the system can dispatch media key event "

                            + "to the global priority session.");

                    return;

                }



                synchronized (mLock) {

                    // If we don't have a media button receiver to fall back on