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Bug#25679

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"Federated Denial of Service"
  Federated storage engine used to attempt to open connections within
  the ::create() and ::open() methods which are invoked while LOCK_open
  mutex is being held by mysqld. As a result, no other client sessions
  can open tables while Federated is attempting to open a connection.
  Long DNS lookup times would stall mysqld's operation and a rogue
  connection string which connects to a remote server which simply
  stalls during handshake can stall mysqld for a much longer period of
  time.
  This patch moves the opening of the connection much later, when the
  federated actually issues queries, by which time the LOCK_open mutex is
  no longer being held.
This commit is contained in:
acurtis/antony@xiphis.org/ltamd64.xiphis.org
2007-07-25 12:23:24 -07:00
parent 3f06084e7f
commit fbcd70a494
4 changed files with 154 additions and 163 deletions
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11
mysql-test/r/federated.result
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@@ -40,17 +40,18 @@ CREATE TABLE federated.t1 (
)
ENGINE="FEDERATED" DEFAULT CHARSET=latin1
CONNECTION='mysql://root@127.0.0.1:SLAVE_PORT/federated/t3';
ERROR HY000: Can't create federated table. Foreign data src error: error: 1146 'Table 'federated.t3' doesn't exist'
SELECT * FROM federated.t1;
ERROR HY000: The foreign data source you are trying to reference does not exist. Data source error: error: 1146 'Table 'federated.t3' doesn't exist'
DROP TABLE federated.t1;
CREATE TABLE federated.t1 (
`id` int(20) NOT NULL,
`name` varchar(32) NOT NULL default ''
)
ENGINE="FEDERATED" DEFAULT CHARSET=latin1
CONNECTION='mysql://user:pass@127.0.0.1:SLAVE_PORT/federated/t1';
ERROR HY000: Unable to connect to foreign data source: database: 'federated' username: 'user' hostname: '127.0.0.1'
DROP TABLE IF EXISTS federated.t1;
Warnings:
Note 1051 Unknown table 't1'
SELECT * FROM federated.t1;
ERROR HY000: Unable to connect to foreign data source: Access denied for user 'user'@'localhost' (using password: YES)
DROP TABLE federated.t1;
CREATE TABLE federated.t1 (
`id` int(20) NOT NULL,
`name` varchar(32) NOT NULL default ''