Let Drupal (6 or 7) handle the generation of system links to 'admin/.../permissions' so that the urls can be hook altered if necessary by modules like Rename Admin Paths:
https://www.drupal.org/project/rename_admin_paths
switch ($config->userFramework) {
case 'Drupal':
- $this->assign('ufAccessURL', CRM_Utils_System::url('admin/people/permissions'));
+ $this->assign('ufAccessURL', url('admin/people/permissions'));
break;
case 'Drupal6':
- $this->assign('ufAccessURL', CRM_Utils_System::url('admin/user/permissions'));
+ $this->assign('ufAccessURL', url('admin/user/permissions'));
break;
case 'Joomla':