Details
MySQL can operate using a variety of log files, each used for different purposes. These are the binary log, error log, slow query log, relay log, and general log. Because these are files on the host operating system, they are subject to the permissions structure provided by the host and may be accessible by users other than the MySQL user.
Solution
Execute the following command for each log file location requiring corrected permissions:
chmod 660
chown mysql:mysql
Supportive Information
The following resource is also helpful.
This control applies to the following type of system Unix.