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  1. MariaDB Server
  2. MDEV-19141

server_audit_excl_users accepts only values with less than 1024 chars

Details

    Description

      Assigning to server_audit_excl_users seems to be cut at ~ 1024 chars.

      To reproduce..

      SET GLOBAL server_audit_excl_users = "'root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root3','root4'"

      Output for the variables...

      SHOW GLOBAL VARIABLES LIKE '%server_audit_excl_users%';


       
      		 
      SELECT LENGTH("'root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root','root3'");

      User root4 will be cut.

      It seems, it will be caused by

      #define SHOW_VAR_FUNC_BUFF_SIZE 1024

      from MySQL Plugin API

      https://dev.mysql.com/doc/refman/8.0/en/plugin-data-structures.html#plugin-status-system-variables

      So it be expanded to more than 1024 or throw an error message and documented in the audit plugin documentation.

      Attachments

        Issue Links

          relates to

          Task - A task that needs to be done. MDEV-19459 Backport MDEV-17456 to server_audit plugin in 10.1

          • Major - Major loss of function.
          • Closed

          Activity

            holyfoot Alexey Botchkov added a comment -

            http://lists.askmonty.org/pipermail/commits/2019-April/013695.html

            Now we'll launch an error message when try to set too long value to server_audit_incl/excl_users .

            holyfoot Alexey Botchkov added a comment - http://lists.askmonty.org/pipermail/commits/2019-April/013695.html Now we'll launch an error message when try to set too long value to server_audit_incl/excl_users .

            People

              holyfoot Alexey Botchkov
              Richard Richard Stracke
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              Dates

                Created:
                Updated:
                Resolved:

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