diff --git a/core/includes/path.inc b/core/includes/path.inc
index 911cfe0..d17f58f 100644
--- a/core/includes/path.inc
+++ b/core/includes/path.inc
@@ -207,44 +207,16 @@ function drupal_valid_path($path, $dynamic_allowed = FALSE) {
       $item['options'] = '';
       _menu_link_translate($item);
     }
-    if (empty($item['access'])) {
-      // Nothing was found in the old routing system, so try the new one.
-      $item = _drupal_valid_path_new_router($path);
-    }
   }
   else {
     $item = menu_get_item($path);
-    if (empty($item['access'])) {
-      // Nothing was found in the old routing system, so try the new one.
-      $item = _drupal_valid_path_new_router($path);
-    }
+  }
+  // Check the new routing system.
+  if (!empty($item['route_name'])) {
+    $map = array();
+    $route = Drupal::service('router.route_provider')->getRouteByName($item['route_name']);
+    $item['access'] = menu_item_route_access($route, $path, $map);
   }
   $menu_admin = FALSE;
   return $item && $item['access'];
 }
-
-/**
- * Temporary helper function to check a path in the new routing system.
- *
- * @param string $path
- *   The path string as expected by drupal_valid_path().
- *
- * @return array|NULL
- *   An array containing 'access' => TRUE or NULL for paths that were not found
- *   or the user has no access to.
- */
-function _drupal_valid_path_new_router($path) {
-  $request = Request::create('/' . $path);
-  $request->attributes->set('system_path', $path);
-  try {
-    $dc = drupal_container();
-    $route = $dc->get('router.dynamic')->matchRequest($request);
-    if (!empty($route)) {
-      $dc->get('access_manager')->check($route['_route_object'], $request);
-    }
-    return array('access' => TRUE);
-  }
-  catch (Exception $e) {
-    drupal_set_message($e->getMessage(), 'menu', WATCHDOG_ERROR);
-  }
-}
diff --git a/core/modules/user/lib/Drupal/user/Form/UserPermissionsForm.php b/core/modules/user/lib/Drupal/user/Form/UserPermissionsForm.php
new file mode 100644
index 0000000..b3c28cc
--- /dev/null
+++ b/core/modules/user/lib/Drupal/user/Form/UserPermissionsForm.php
@@ -0,0 +1,202 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\user\Form\UserPermissionsForm.
+ */
+
+namespace Drupal\user\Form;
+
+use Drupal\Component\Utility\String;
+use Drupal\Core\Cache\Cache;
+use Drupal\Core\Controller\ControllerInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Form\FormInterface;
+use Drupal\user\RoleStorageControllerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides the user permissions administration form.
+ */
+class UserPermissionsForm implements FormInterface, ControllerInterface {
+
+  /**
+   * The module handler.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
+   * The role storage.
+   *
+   * @var \Drupal\user\RoleStorageControllerInterface
+   */
+  protected $roleStorage;
+
+  /**
+   * Constructs a new UserPermissionsForm.
+   *
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler.
+   * @param \Drupal\user\RoleStorageControllerInterface $role_storage
+   *   The role storage.
+   */
+  public function __construct(ModuleHandlerInterface $module_handler, RoleStorageControllerInterface $role_storage) {
+    $this->moduleHandler = $module_handler;
+    $this->roleStorage = $role_storage;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('module_handler'),
+      $container->get('plugin.manager.entity')->getStorageController('user_role')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormID() {
+    return 'user_admin_permissions';
+  }
+
+  /**
+   * Gets the roles to display in this form.
+   *
+   * @return \Drupal\user\RoleInterface[]
+   *   An array of role objects.
+   */
+  protected function getRoles() {
+    return $this->roleStorage->loadMultiple();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, array &$form_state) {
+    $role_names = array();
+    $role_permissions = array();
+    foreach ($this->getRoles() as $role_name => $role) {
+      // Retrieve role names for columns.
+      $role_names[$role_name] = String::checkPlain($role->label());
+      // Fetch permissions for the roles.
+      $role_permissions[$role_name] = $role->getPermissions();
+    }
+
+    // Store $role_names for use when saving the data.
+    $form['role_names'] = array(
+      '#type' => 'value',
+      '#value' => $role_names,
+    );
+    // Render role/permission overview:
+    $options = array();
+    $module_info = system_rebuild_module_data();
+    $hide_descriptions = system_admin_compact_mode();
+
+    // Get a list of all the modules implementing a hook_permission() and sort by
+    // display name.
+    $modules = array();
+    foreach ($this->moduleHandler->getImplementations('permission') as $module) {
+      $modules[$module] = $module_info[$module]->info['name'];;
+    }
+    asort($modules);
+
+    $form['system_compact_link'] = array(
+      '#theme' => 'system_compact_link',
+    );
+
+    $form['permissions'] = array(
+      '#type' => 'table',
+      '#header' => array(t('Permission')),
+      '#id' => 'permissions',
+    );
+    foreach ($role_names as $rid => $name) {
+      $form['permissions']['#header'][] = array(
+        'data' => $name,
+        'class' => array('checkbox'),
+      );
+    }
+
+    foreach ($modules as $module => $display_name) {
+      if ($permissions = $this->moduleHandler->invoke($module, 'permission')) {
+        // Module name.
+        $form['permissions'][$module] = array(array(
+          '#wrapper_attributes' => array(
+            'colspan' => count($role_names) + 1,
+            'class' => array('module'),
+            'id' => 'module-' . $module,
+          ),
+          '#markup' => $module_info[$module]->info['name'],
+        ));
+        foreach ($permissions as $perm => $perm_item) {
+          // Fill in default values for the permission.
+          $perm_item += array(
+            'description' => '',
+            'restrict access' => FALSE,
+            'warning' => !empty($perm_item['restrict access']) ? t('Warning: Give to trusted roles only; this permission has security implications.') : '',
+          );
+          $options[$perm] = '';
+          $user_permission_description = array(
+            '#theme' => 'user_permission_description',
+            '#permission_item' => $perm_item,
+            '#hide' => $hide_descriptions,
+          );
+          $form['permissions'][$perm]['description'] = array(
+            '#wrapper_attributes' => array(
+              'class' => array('permission'),
+            ),
+            '#type' => 'item',
+            '#markup' => $perm_item['title'],
+            '#description' => drupal_render($user_permission_description),
+          );
+          $options[$perm] = '';
+          foreach ($role_names as $rid => $name) {
+            $form['permissions'][$perm][$rid] = array(
+              '#title' => $name . ': ' . $perm_item['title'],
+              '#title_display' => 'invisible',
+              '#wrapper_attributes' => array(
+                'class' => array('checkbox'),
+              ),
+              '#type' => 'checkbox',
+              '#default_value' => in_array($perm,$role_permissions[$rid]) ? 1 : 0,
+              '#attributes' => array('class' => array('rid-' . $rid)),
+              '#parents' => array($rid, $perm),
+            );
+          }
+        }
+      }
+    }
+
+    $form['actions'] = array('#type' => 'actions');
+    $form['actions']['submit'] = array('#type' => 'submit', '#value' => t('Save permissions'));
+
+    $form['#attached']['library'][] = array('user', 'drupal.user.permissions');
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, array &$form_state) {
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  function submitForm(array &$form, array &$form_state) {
+    foreach ($form_state['values']['role_names'] as $role_name => $name) {
+      user_role_change_permissions($role_name, $form_state['values'][$role_name]);
+    }
+
+    drupal_set_message(t('The changes have been saved.'));
+
+    // Clear the cached pages and blocks.
+    Cache::invalidateTags(array('content' => TRUE));
+  }
+
+}
diff --git a/core/modules/user/lib/Drupal/user/Form/UserPermissionsRoleSpecificForm.php b/core/modules/user/lib/Drupal/user/Form/UserPermissionsRoleSpecificForm.php
new file mode 100644
index 0000000..19d5dce
--- /dev/null
+++ b/core/modules/user/lib/Drupal/user/Form/UserPermissionsRoleSpecificForm.php
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\user\Form\UserPermissionsRoleSpecificForm.
+ */
+
+namespace Drupal\user\Form;
+
+/**
+ * Provides the user permissions administration form for a specific role.
+ */
+class UserPermissionsRoleSpecificForm extends UserPermissionsForm {
+
+  /**
+   * The specific role for this form.
+   *
+   * @var string
+   */
+  protected $roleId;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getRoles() {
+    return array($this->roleId => $this->roleStorage->load($this->roleId));
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * @param string $role_id
+   *   The user role ID used for this form.
+   */
+  public function buildForm(array $form, array &$form_state, $role_id = NULL) {
+    $this->roleId = $role_id;
+    return parent::buildForm($form, $form_state);
+  }
+
+}
diff --git a/core/modules/user/user.admin.inc b/core/modules/user/user.admin.inc
index 58063e8..c8e4fd7 100644
--- a/core/modules/user/user.admin.inc
+++ b/core/modules/user/user.admin.inc
@@ -97,130 +97,6 @@ function user_admin_account() {
 }
 
 /**
- * Menu callback: administer permissions.
- *
- * @ingroup forms
- * @see user_admin_permissions_submit()
- * @see theme_user_admin_permissions()
- */
-function user_admin_permissions($form, $form_state, $rid = NULL) {
-  // Retrieve role names for columns.
-  $role_names = user_role_names();
-  if (isset($rid)) {
-    $role_names = array($rid => $role_names[$rid]);
-  }
-  // Fetch permissions for all roles or the one selected role.
-  $role_permissions = user_role_permissions(array_keys($role_names));
-
-  // Store $role_names for use when saving the data.
-  $form['role_names'] = array(
-    '#type' => 'value',
-    '#value' => $role_names,
-  );
-  // Render role/permission overview:
-  $options = array();
-  $module_info = system_get_info('module');
-  $hide_descriptions = system_admin_compact_mode();
-
-  // Get a list of all the modules implementing a hook_permission() and sort by
-  // display name.
-  $modules = array();
-  foreach (module_implements('permission') as $module) {
-    $modules[$module] = $module_info[$module]['name'];
-  }
-  asort($modules);
-
-  $form['system_compact_link'] = array(
-    '#theme' => 'system_compact_link',
-  );
-
-  $form['permissions'] = array(
-    '#type' => 'table',
-    '#header' => array(t('Permission')),
-    '#id' => 'permissions',
-  );
-  foreach ($role_names as $rid => $name) {
-    $form['permissions']['#header'][] = array(
-      'data' => $name,
-      'class' => array('checkbox'),
-    );
-  }
-
-  foreach ($modules as $module => $display_name) {
-    if ($permissions = module_invoke($module, 'permission')) {
-      // Module name.
-      $form['permissions'][$module] = array(array(
-        '#wrapper_attributes' => array(
-          'colspan' => count($role_names) + 1,
-          'class' => array('module'),
-          'id' => 'module-' . $module,
-        ),
-        '#markup' => $module_info[$module]['name'],
-      ));
-      foreach ($permissions as $perm => $perm_item) {
-        // Fill in default values for the permission.
-        $perm_item += array(
-          'description' => '',
-          'restrict access' => FALSE,
-          'warning' => !empty($perm_item['restrict access']) ? t('Warning: Give to trusted roles only; this permission has security implications.') : '',
-        );
-        $options[$perm] = '';
-        $user_permission_description = array(
-          '#theme' => 'user_permission_description',
-          '#permission_item' => $perm_item,
-          '#hide' => $hide_descriptions,
-        );
-        $form['permissions'][$perm]['description'] = array(
-          '#wrapper_attributes' => array(
-            'class' => array('permission'),
-          ),
-          '#type' => 'item',
-          '#markup' => $perm_item['title'],
-          '#description' => drupal_render($user_permission_description),
-        );
-        $options[$perm] = '';
-        foreach ($role_names as $rid => $name) {
-          $form['permissions'][$perm][$rid] = array(
-            '#title' => $name . ': ' . $perm_item['title'],
-            '#title_display' => 'invisible',
-            '#wrapper_attributes' => array(
-              'class' => array('checkbox'),
-            ),
-            '#type' => 'checkbox',
-            '#default_value' => in_array($perm,$role_permissions[$rid]) ? 1 : 0,
-            '#attributes' => array('class' => array('rid-' . $rid)),
-            '#parents' => array($rid, $perm),
-          );
-        }
-      }
-    }
-  }
-
-  $form['actions'] = array('#type' => 'actions');
-  $form['actions']['submit'] = array('#type' => 'submit', '#value' => t('Save permissions'));
-
-  $form['#attached']['library'][] = array('user', 'drupal.user.permissions');
-
-  return $form;
-}
-
-/**
- * Save permissions selected on the administer permissions page.
- *
- * @see user_admin_permissions()
- */
-function user_admin_permissions_submit($form, &$form_state) {
-  foreach ($form_state['values']['role_names'] as $rid => $name) {
-    user_role_change_permissions($rid, $form_state['values'][$rid]);
-  }
-
-  drupal_set_message(t('The changes have been saved.'));
-
-  // Clear the cached pages and blocks.
-  cache_invalidate_tags(array('content' => TRUE));
-}
-
-/**
  * Returns HTML for an individual permission description.
  *
  * @param $variables
diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index 924b221..1a8c53c 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -858,10 +858,7 @@ function user_menu() {
   $items['admin/people/permissions'] = array(
     'title' => 'Permissions',
     'description' => 'Determine access to features by selecting permissions for roles.',
-    'page callback' => 'drupal_get_form',
-    'page arguments' => array('user_admin_permissions'),
-    'access arguments' => array('administer permissions'),
-    'file' => 'user.admin.inc',
+    'route_name' => 'user_admin_permissions',
     'type' => MENU_LOCAL_TASK,
   );
   $items['admin/people/roles'] = array(
diff --git a/core/modules/user/user.routing.yml b/core/modules/user/user.routing.yml
index 10ec95d..90570ea 100644
--- a/core/modules/user/user.routing.yml
+++ b/core/modules/user/user.routing.yml
@@ -40,6 +40,20 @@ user_admin_create:
   requirements:
     _permission: 'administer users'
 
+user_admin_permissions:
+  pattern: '/admin/people/permissions'
+  defaults:
+    _form: '\Drupal\user\Form\UserPermissionsForm'
+  requirements:
+    _permission: 'administer permissions'
+
+user_admin_permission:
+  pattern: '/admin/people/permissions/{role_id}'
+  defaults:
+    _form: '\Drupal\user\Form\UserPermissionsRoleSpecificForm'
+  requirements:
+    _permission: 'administer permissions'
+
 user_role_list:
   pattern: '/admin/people/roles'
   defaults: