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Bug#26174 Server Crash:INSERT ... SELECT ... FROM I_S.GLOBAL_STATUS in Event

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- Some variables in I_S.GLOBAL_STATUS were depending on a network
  connection in order to evaluate. Since no network connection is 
  present during the execution of an event, this caused the server
  to crash.
- The variable function hooks does now verify that the vio-
  object is valid before attempting to use it.
This commit is contained in:
Kristofer.Pettersson@naruto. 2007-04-02 09:51:14 +02:00
parent 09d89e9cdd
commit f85f0950a0
4 changed files with 103 additions and 19 deletions
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28
mysql-test/r/information_schema.result
View file

@ -1408,4 +1408,32 @@ select user,db from information_schema.processlist;
user db
user3148 test
drop user user3148@localhost;
DROP TABLE IF EXISTS thread_status;
CREATE TABLE thread_status (variable_name VARCHAR(64),
variable_value DECIMAL(22,7));
CREATE TABLE server_status (variable_name VARCHAR(64),
variable_value DECIMAL(22,7));
DROP EVENT IF EXISTS log_status;
CREATE EVENT log_status
ON SCHEDULE EVERY 1 SECOND
DO
BEGIN
INSERT INTO thread_status SELECT variable_name, variable_value FROM
information_schema.session_status;
INSERT INTO server_status SELECT variable_name, variable_value FROM
information_schema.global_status;
END$$
SET GLOBAL event_scheduler=1;
SELECT * FROM thread_status WHERE variable_name LIKE 'SSL%' LIMIT 1,2;
variable_name variable_value
SSL_ACCEPTS 0.0000000
SSL_CALLBACK_CACHE_HITS 0.0000000
SELECT variable_name FROM server_status LIMIT 1,2;
variable_name
ABORTED_CONNECTS
BINLOG_CACHE_DISK_USE
DROP EVENT log_status;
DROP TABLE thread_status;
DROP TABLE server_status;
SET GLOBAL event_scheduler=0;
End of 5.1 tests.

40
mysql-test/t/information_schema.test
View file

@ -1042,5 +1042,45 @@ select user,db from information_schema.processlist;
connection default;
drop user user3148@localhost;
#
# Bug #26174 Server Crash: INSERT ... SELECT ... FROM I_S.GLOBAL_STATUS in Event
#
--disable_warnings
DROP TABLE IF EXISTS thread_status;
CREATE TABLE thread_status (variable_name VARCHAR(64),
variable_value DECIMAL(22,7));
CREATE TABLE server_status (variable_name VARCHAR(64),
variable_value DECIMAL(22,7));
DROP EVENT IF EXISTS log_status;
--enable_warnings
DELIMITER $$;
CREATE EVENT log_status
ON SCHEDULE EVERY 1 SECOND
DO
BEGIN
INSERT INTO thread_status SELECT variable_name, variable_value FROM
information_schema.session_status;
INSERT INTO server_status SELECT variable_name, variable_value FROM
information_schema.global_status;
END$$
DELIMITER ;$$
SET GLOBAL event_scheduler=1;
sleep 1;
SELECT * FROM thread_status WHERE variable_name LIKE 'SSL%' LIMIT 1,2;
SELECT variable_name FROM server_status LIMIT 1,2;
DROP EVENT log_status;
DROP TABLE thread_status;
DROP TABLE server_status;
SET GLOBAL event_scheduler=0;
--echo End of 5.1 tests.

52
sql/mysqld.cc
View file

@ -3803,6 +3803,8 @@ we force server id to 2, but this MySQL server will not act as a slave.");
{
if (Events::get_instance()->init())
unireg_abort(1);
} else {
Events::opt_event_scheduler= Events::EVENTS_DISABLED;
}
/* Signal threads waiting for server to be started */
@ -6662,12 +6664,20 @@ static int show_ssl_ctx_get_session_cache_mode(THD *thd, SHOW_VAR *var, char *bu
return 0;
}
/* Functions relying on SSL */
/*
Functions relying on SSL
Note: In the show_ssl_* functions, we need to check if we have a
valid vio-object since this isn't always true, specifically
when session_status or global_status is requested from
inside an Event.
*/
static int show_ssl_get_version(THD *thd, SHOW_VAR *var, char *buff)
{
var->type= SHOW_CHAR;
var->value= const_cast<char*>(thd->net.vio->ssl_arg ?
SSL_get_version((SSL*) thd->net.vio->ssl_arg) : "");
if( thd->vio_ok() && thd->net.vio->ssl_arg )
var->value= const_cast<char*>(SSL_get_version((SSL*) thd->net.vio->ssl_arg));
else
var->value= "";
return 0;
}
@ -6675,9 +6685,10 @@ static int show_ssl_session_reused(THD *thd, SHOW_VAR *var, char *buff)
{
var->type= SHOW_LONG;
var->value= buff;
*((long *)buff)= (long)thd->net.vio->ssl_arg ?
SSL_session_reused((SSL*) thd->net.vio->ssl_arg) :
0;
if( thd->vio_ok() && thd->net.vio->ssl_arg )
*((long *)buff)= (long)SSL_session_reused((SSL*) thd->net.vio->ssl_arg);
else
*((long *)buff)= 0;
return 0;
}
@ -6685,9 +6696,10 @@ static int show_ssl_get_default_timeout(THD *thd, SHOW_VAR *var, char *buff)
{
var->type= SHOW_LONG;
var->value= buff;
*((long *)buff)= (long)thd->net.vio->ssl_arg ?
SSL_get_default_timeout((SSL*)thd->net.vio->ssl_arg) :
0;
if( thd->vio_ok() && thd->net.vio->ssl_arg )
*((long *)buff)= (long)SSL_get_default_timeout((SSL*)thd->net.vio->ssl_arg);
else
*((long *)buff)= 0;
return 0;
}
@ -6695,9 +6707,10 @@ static int show_ssl_get_verify_mode(THD *thd, SHOW_VAR *var, char *buff)
{
var->type= SHOW_LONG;
var->value= buff;
*((long *)buff)= (long)thd->net.vio->ssl_arg ?
SSL_get_verify_mode((SSL*)thd->net.vio->ssl_arg) :
0;
if( thd->net.vio && thd->net.vio->ssl_arg )
*((long *)buff)= (long)SSL_get_verify_mode((SSL*)thd->net.vio->ssl_arg);
else
*((long *)buff)= 0;
return 0;
}
@ -6705,17 +6718,20 @@ static int show_ssl_get_verify_depth(THD *thd, SHOW_VAR *var, char *buff)
{
var->type= SHOW_LONG;
var->value= buff;
*((long *)buff)= (long)thd->net.vio->ssl_arg ?
SSL_get_verify_depth((SSL*)thd->net.vio->ssl_arg) :
0;
if( thd->vio_ok() && thd->net.vio->ssl_arg )
*((long *)buff)= (long)SSL_get_verify_depth((SSL*)thd->net.vio->ssl_arg);
else
*((long *)buff)= 0;
return 0;
}
static int show_ssl_get_cipher(THD *thd, SHOW_VAR *var, char *buff)
{
var->type= SHOW_CHAR;
var->value= const_cast<char*>(thd->net.vio->ssl_arg ?
SSL_get_cipher((SSL*) thd->net.vio->ssl_arg) : "");
if( thd->vio_ok() && thd->net.vio->ssl_arg )
var->value= const_cast<char*>(SSL_get_cipher((SSL*) thd->net.vio->ssl_arg));
else
var->value= "";
return 0;
}
@ -6723,7 +6739,7 @@ static int show_ssl_get_cipher_list(THD *thd, SHOW_VAR *var, char *buff)
{
var->type= SHOW_CHAR;
var->value= buff;
if (thd->net.vio->ssl_arg)
if (thd->vio_ok() && thd->net.vio->ssl_arg)
{
int i;
const char *p;

2
sql/set_var.cc
View file

@ -4000,7 +4000,7 @@ sys_var_event_scheduler::update(THD *thd, set_var *var)
DBUG_ENTER("sys_var_event_scheduler::update");
if (Events::opt_event_scheduler == Events::EVENTS_DISABLED)
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--event-scheduler=DISABLED");
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--event-scheduler=DISABLED or --skip-grant-tables");
DBUG_RETURN(TRUE);
}