diff --git a/src/android/support/v7/mms/MmsNetworkManager.java b/src/android/support/v7/mms/MmsNetworkManager.java
index 059ca8f..1021b5a 100644
--- a/src/android/support/v7/mms/MmsNetworkManager.java
+++ b/src/android/support/v7/mms/MmsNetworkManager.java
@@ -324,7 +324,8 @@
 
     private void registerConnectivityChangeReceiverLocked() {
         if (!mReceiverRegistered) {
-            mContext.registerReceiver(mConnectivityChangeReceiver, mConnectivityIntentFilter);
+            mContext.registerReceiver(mConnectivityChangeReceiver, mConnectivityIntentFilter,
+                    Context.RECEIVER_EXPORTED/*UNAUDITED*/);
             mReceiverRegistered = true;
         }
     }
diff --git a/src/com/android/messaging/BugleApplication.java b/src/com/android/messaging/BugleApplication.java
index 0ef8d91..36f062b 100644
--- a/src/com/android/messaging/BugleApplication.java
+++ b/src/com/android/messaging/BugleApplication.java
@@ -132,7 +132,8 @@
                 LogUtil.i(TAG, "Carrier config changed. Reloading MMS config.");
                 MmsConfig.loadAsync();
             }
-        }, new IntentFilter(CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED));
+        }, new IntentFilter(CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED),
+        Context.RECEIVER_EXPORTED/*UNAUDITED*/);
     }
 
     private static void initMmsLib(final Context context, final BugleGservices bugleGservices,
diff --git a/src/com/android/messaging/ui/conversation/LaunchConversationActivity.java b/src/com/android/messaging/ui/conversation/LaunchConversationActivity.java
index 5500ae8..c869839 100644
--- a/src/com/android/messaging/ui/conversation/LaunchConversationActivity.java
+++ b/src/com/android/messaging/ui/conversation/LaunchConversationActivity.java
@@ -37,6 +37,8 @@
 
 import java.io.UnsupportedEncodingException;
 import java.net.URLDecoder;
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Launches ConversationActivity for sending a message to, or viewing messages from, a specific
@@ -46,6 +48,7 @@
  */
 public class LaunchConversationActivity extends Activity implements
         LaunchConversationData.LaunchConversationDataListener {
+    private static final int MAX_RECIPIENT_LENGTH = 100;
     static final String SMS_BODY = "sms_body";
     static final String ADDRESS = "address";
     final Binding<LaunchConversationData> mBinding = BindingBase.createBinding(this);
@@ -76,6 +79,9 @@
                     recipients = new String[] { intent.getStringExtra(Intent.EXTRA_EMAIL) };
                 }
             }
+            if (recipients != null) {
+                recipients = trimInvalidRecipients(recipients);
+            }
             mSmsBody = intent.getStringExtra(SMS_BODY);
             if (TextUtils.isEmpty(mSmsBody)) {
                 // Used by intents sent from the web YouTube (and perhaps others).
@@ -103,6 +109,20 @@
         finish();
     }
 
+    private String[] trimInvalidRecipients(String[] recipients) {
+        List<String> trimmedRecipients = new ArrayList<>();
+        for (String recipient : recipients) {
+            if (recipient.length() < MAX_RECIPIENT_LENGTH) {
+                trimmedRecipients.add(recipient);
+            }
+        }
+        if (trimmedRecipients.size() > 0) {
+            return trimmedRecipients.toArray(new String[0]);
+        } else {
+            return null;
+        }
+    }
+
     private String getBody(final Uri uri) {
         if (uri == null) {
             return null;
diff --git a/src/com/android/messaging/util/FileUtil.java b/src/com/android/messaging/util/FileUtil.java
index 71fbb4b..e7d86f2 100644
--- a/src/com/android/messaging/util/FileUtil.java
+++ b/src/com/android/messaging/util/FileUtil.java
@@ -20,6 +20,7 @@
 import android.content.Context;
 import android.net.Uri;
 import android.os.Environment;
+import android.os.ParcelFileDescriptor;
 import android.text.TextUtils;
 
 import com.android.messaging.Factory;
@@ -28,6 +29,8 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.Locale;
@@ -121,6 +124,10 @@
     // We're told it's possible to create world readable hardlinks to other apps private data
     // so we ban all /data file uris.
     public static boolean isInPrivateDir(Uri uri) {
+        return isFileUriInPrivateDir(uri) || isContentUriInPrivateDir(uri);
+    }
+
+    private static boolean isFileUriInPrivateDir(Uri uri) {
         if (!UriUtil.isFileUri(uri)) {
             return false;
         }
@@ -128,6 +135,24 @@
         return FileUtil.isSameOrSubDirectory(Environment.getDataDirectory(), file);
     }
 
+    private static boolean isContentUriInPrivateDir(Uri uri) {
+        if (!uri.getScheme().equals(ContentResolver.SCHEME_CONTENT)) {
+            return false;
+        }
+        try {
+            Context context = Factory.get().getApplicationContext();
+            ParcelFileDescriptor pfd = context.getContentResolver().openFileDescriptor(uri, "r");
+            int fd = pfd.getFd();
+            // Use the file descriptor to find out the read file path through symbolic link.
+            Path fdPath = Paths.get("/proc/self/fd/" + fd);
+            Path filePath = java.nio.file.Files.readSymbolicLink(fdPath);
+            pfd.close();
+            return FileUtil.isSameOrSubDirectory(Environment.getDataDirectory(), filePath.toFile());
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
     /**
      * Checks, whether the child directory is the same as, or a sub-directory of the base
      * directory.