Permission denied for chdir in _drupal_shutdown_function() within includes/bootstrap.inc

API page: https://api.drupal.org/api/drupal/includes%21bootstrap.inc/function/_dru...

Hi folks.

The watchdog of my Drupal 7.51-based web site recorded this warning only once:

• Type: php
• User: Anonymous (not verified)
• Location: URL of a public web page of the web site
• Warning: chdir(): Permission denied (errno 13) in _drupal_shutdown_function() (line 3761 of /home/my_web_site/public_html/includes/bootstrap.inc)

The web page where the warning occurred is rendered perfectly when I visit it as an anonymous user. None of my users reported any problem with this page so far. I found out that the warning occurred when the page was accessed from a server in Taiwan, a country which is not a target of the web site.

So I guess someone was trying to gain access to the web site's administration surreptitiously, but the system (I do hope so!) did not allow him/her to.

My questions are:

• Is this warning something I should worry about?
• Is this a normal behaviour of Drupal core?
• Can I be sure no one could gain unauthorized access to the administration of the web site?

My server has the following configuration:

• Apache/2.4.23 (Unix)
• CentOS Linux release 7.2.1511 (Core))
• Drupal 7.51
• PHP 5.4.45
• MySQL 5.6.33 Community Server (GPL)

Many Thanks in advance! :)
Reis