What happened?

1. Configure php-fpm with a custom temporary directory (e.g. sys_temp_dir = /var/lib/php/tmp in php.ini or pool config)
2. Restrict access to /tmp via AppArmor, SELinux, or open_basedir
3. Save Global Configuration in Joomla administrator
4. Path::isOwner() is called, attempts is_writable('/tmp'), fails, falls through to . (current directory) or session.save_path
5. AppArmor logs DENIED operation="mknod" on /tmp/<hash>
6. The UI displays: Joomla\Filesystem\File::delete: Failed deleting <hash>

Version

6.0

Expected result

Able to save configuration.php using the UI.

Actual result

System Information

• Ubuntu 24.04
• PHP 8.*
• /tmp protected (AppArmor)
• Joomla 5 & 6

Additional Comments

Fixed by : joomla-framework/filesystem#80