Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/tracker/src/Access/ViewOwnTrackerAccessCheck.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\tracker\Access\ViewOwnTrackerAccessCheck.
+ */
+
+namespace Drupal\tracker\Access;
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Routing\Access\AccessInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\user\UserInterface;
+
+/**
+ * Access check for user tracker routes.
+ */
+class ViewOwnTrackerAccessCheck implements AccessInterface {
+
+  /**
+   * Checks access.
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The currently logged in account.
+   * @param \Drupal\user\UserInterface $user
+   *   The user whose tracker page is being accessed.
+   *
+   * @return \Drupal\Core\Access\AccessResultInterface
+   *   The access result.
+   */
+  public function access(AccountInterface $account, UserInterface $user) {
+    return AccessResult::allowedIf($user && $account->isAuthenticated() && ($user->id() == $account->id()))->cachePerUser();
+  }
+}