DO NOT MERGE Fix security vulnerabilities in permission of deleting MMS/SMS

This CL adds permission check to avoid unauthorized deletion of any MMS/SMS
messages in BluetoothMapContentObserver.actionMessageSentDisconnected
function.

Bug: 22343270
Change-Id: I30254036309733be4d54db17a8ef17a571cd1c5a

Author: mcchou-cr

src/com/android/bluetooth/map/BluetoothMapContentObserver.java

@@ -30,6 +30,7 @@
 
 import org.xmlpull.v1.XmlSerializer;
 
+import android.Manifest;
 import android.app.Activity;
 import android.app.PendingIntent;
 import android.content.BroadcastReceiver;
@@ -39,10 +40,13 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.pm.PackageManager;
 import android.database.ContentObserver;
 import android.database.Cursor;
 import android.net.Uri;
+import android.os.Binder;
 import android.os.Handler;
+import android.os.Process;
 import android.provider.BaseColumns;
 import android.provider.Telephony;
 import android.provider.Telephony.Mms;
@@ -1014,6 +1018,13 @@ public void onReceive(Context context, Intent intent) {
 
         private void actionMessageSent(Context context, Intent intent,
             PushMsgInfo msgInfo) {
+            /* Check permission for message deletion. */
+            if (context.checkCallingOrSelfPermission(android.Manifest.permission.WRITE_SMS)
+                  != PackageManager.PERMISSION_GRANTED) {
+                Log.w(TAG, "actionSmsSentDisconnected: Not allowed to delete SMS/MMS messages");
+                return;
+            }
+
             int result = getResultCode();
             boolean delete = false;
 
@@ -1064,8 +1075,7 @@ private void actionMessageSent(Context context, Intent intent,
             }
         }
 
-        private void actionMessageDelivery(Context context, Intent intent,
-            PushMsgInfo msgInfo) {
+        private void actionMessageDelivery(Context context, Intent intent, PushMsgInfo msgInfo) {
             Uri messageUri = intent.getData();
             byte[] pdu = intent.getByteArrayExtra("pdu");
             String format = intent.getStringExtra("format");