Description:
INSTALL PLUGIN does not check the lenght of a plugins name.
One can install plugins with a name of more than 64 characters. Immediately after the installation the plugin is reported by SHOW PLUGINS to be active. After a server restart the plugin cannot be loaded again because of the silently truncated plugin name. The latter is what makes the lack of a WARNING a bit nasty: you install a plugin, it works, your server restarts, the plugin is gone.
How to repeat:
mysql> INSTALL PLUGIN plugin_name_longer_than_64_012345678901234567890123456789012345678901234567890123456789 SONAME 'authentication_pam.so';
Query OK, 0 rows affected (0.00 sec)
mysql> SHOW PLUGINS;
+------------------------------------------------------------------+----------+--------------------+-----------------------+-------------+
| Name | Status | Type | Library | License |
+------------------------------------------------------------------+----------+--------------------+-----------------------+-------------+
| binlog | ACTIVE | STORAGE ENGINE | NULL | GPL |
| mysql_native_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| mysql_old_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MEMORY | ACTIVE | STORAGE ENGINE | NULL | GPL |
| CSV | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MRG_MYISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| ARCHIVE | ACTIVE | STORAGE ENGINE | NULL | GPL |
| FEDERATED | DISABLED | STORAGE ENGINE | NULL | GPL |
| BLACKHOLE | ACTIVE | STORAGE ENGINE | NULL | GPL |
| InnoDB | ACTIVE | STORAGE ENGINE | NULL | GPL |
| INNODB_TRX | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCKS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCK_WAITS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| PERFORMANCE_SCHEMA | ACTIVE | STORAGE ENGINE | NULL | GPL |
| partition | ACTIVE | STORAGE ENGINE | NULL | GPL |
| plugin_name_longer_than_64_0123456789012345678901234567890123456 | ACTIVE | AUTHENTICATION | authentication_pam.so | PROPRIETARY |
+------------------------------------------------------------------+----------+--------------------+-----------------------+-------------+
21 rows in set (0.00 sec)
MySQL error log upon MySQL restart:
110126 18:52:45 [ERROR] Can't find symbol 'plugin_name_longer_than_64_0123456789012345678901234567890123456' in library
110126 18:52:45 [Warning] Couldn't load plugin named 'plugin_name_longer_than_64_0123456789012345678901234567890123456' with soname 'authentication_pam.so'.
