database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

MDEV-25237 crash after setting global session_track_system_variables to an invalid value

Browse Source 
Fix of typo in checking variable list corectness.

Fix of error handling in case of variable list parse error
This commit is contained in:
Oleksandr Byelkin
2023-06-27 12:10:48 +02:00
parent 03c2157dd6
commit cf50379b91
6 changed files with 125 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
mysql-test/main/mysqltest_tracking_info.result
View File

@ -57,3 +57,33 @@ ERROR 42000: Variable 'session_track_system_variables' can't be set to the value
SET SESSION session_track_system_variables=NULL;
ERROR 42000: Variable 'session_track_system_variables' can't be set to the value of 'NULL'
# End of 10.3 tests
#
# MDEV-25237: crash after setting global session_track_system_variables
# to an invalid value
#
SET GLOBAL session_track_system_variables='a';
ERROR HY000: Unknown system variable 'a'
SET GLOBAL event_scheduler=1;
# check that value really returns as it was
set GLOBAL session_track_system_variables='character_set_connection';
SET GLOBAL session_track_system_variables='a';
ERROR HY000: Unknown system variable 'a'
connect con,localhost,root,,test;
SET NAMES 'utf8';
-- Tracker : SESSION_TRACK_SYSTEM_VARIABLES
-- character_set_connection
-- utf8
SET NAMES 'big5';
-- Tracker : SESSION_TRACK_SYSTEM_VARIABLES
-- character_set_connection
-- big5
select @@session_track_system_variables;
@@session_track_system_variables
character_set_connection
connection default;
disconnect con;
SET GLOBAL session_track_system_variables=default;
SET GLOBAL event_scheduler=default;
# End of 10.4 test

32
mysql-test/main/mysqltest_tracking_info.test
View File

@ -60,3 +60,35 @@ SET @@GLOBAL.session_track_system_variables=NULL;
SET SESSION session_track_system_variables=NULL;
--echo # End of 10.3 tests
--echo #
--echo # MDEV-25237: crash after setting global session_track_system_variables
--echo # to an invalid value
--echo #
--error ER_UNKNOWN_SYSTEM_VARIABLE
SET GLOBAL session_track_system_variables='a';
SET GLOBAL event_scheduler=1;
--echo # check that value really returns as it was
set GLOBAL session_track_system_variables='character_set_connection';
--error ER_UNKNOWN_SYSTEM_VARIABLE
SET GLOBAL session_track_system_variables='a';
connect (con,localhost,root,,test);
--enable_session_track_info
SET NAMES 'utf8';
SET NAMES 'big5';
--disable_session_track_info
select @@session_track_system_variables;
connection default;
disconnect con;
SET GLOBAL session_track_system_variables=default;
SET GLOBAL event_scheduler=default;
--echo # End of 10.4 test

21
mysql-test/main/mysqltest_tracking_info_debug.result Normal file
View File

@ -0,0 +1,21 @@
set @save_session_track_system_variables=@@session_track_system_variables;
#
# MDEV-25237: Assertion `global_system_variables.
# session_track_system_variables' failed in
# Session_sysvars_tracker::init | SIGSEGV's in __strlen_avx2 |
# UBSAN: runtime error: null pointer passed as argument 1, which
# is declared to never be null in my_strdup
#
# check that that parser problems do not lead to crash
SET @old_debug= @@session.debug;
set debug_dbug="+d,dbug_session_tracker_parse_error";
SET GLOBAL session_track_system_variables='query_cache_size';
ERROR HY001: Out of memory; restart server and try again (needed 1 bytes)
set debug_dbug=@old_debug;
SELECT @@global.session_track_system_variables;
@@global.session_track_system_variables
NULL
SET GLOBAL event_scheduler=1;
SET GLOBAL session_track_system_variables=default;
SET GLOBAL event_scheduler=default;
# End of 10.4 test

30
mysql-test/main/mysqltest_tracking_info_debug.test Normal file
View File

@ -0,0 +1,30 @@
--source include/have_debug.inc
--source include/no_protocol.inc
--source include/not_embedded.inc
set @save_session_track_system_variables=@@session_track_system_variables;
--echo #
--echo # MDEV-25237: Assertion `global_system_variables.
--echo # session_track_system_variables' failed in
--echo # Session_sysvars_tracker::init | SIGSEGV's in __strlen_avx2 |
--echo # UBSAN: runtime error: null pointer passed as argument 1, which
--echo # is declared to never be null in my_strdup
--echo #
--echo # check that that parser problems do not lead to crash
SET @old_debug= @@session.debug;
set debug_dbug="+d,dbug_session_tracker_parse_error";
--error ER_OUTOFMEMORY
SET GLOBAL session_track_system_variables='query_cache_size';
set debug_dbug=@old_debug;
SELECT @@global.session_track_system_variables;
SET GLOBAL event_scheduler=1;
SET GLOBAL session_track_system_variables=default;
SET GLOBAL event_scheduler=default;
--echo # End of 10.4 test

11
sql/session_tracker.cc
View File

@ -221,7 +221,7 @@ bool sysvartrack_validate_value(THD *thd, const char *str, size_t len)
/* Remove leading/trailing whitespace. */
trim_whitespace(system_charset_info, &var);
if (!strcmp(var.str, "*") && !find_sys_var(thd, var.str, var.length))
if (strcmp(var.str, "*") && !find_sys_var(thd, var.str, var.length))
return true;
if (lasts)
@ -331,9 +331,8 @@ void Session_sysvars_tracker::init(THD *thd)
mysql_mutex_assert_owner(&LOCK_global_system_variables);
DBUG_ASSERT(thd->variables.session_track_system_variables ==
global_system_variables.session_track_system_variables);
DBUG_ASSERT(global_system_variables.session_track_system_variables);
thd->variables.session_track_system_variables=
my_strdup(global_system_variables.session_track_system_variables,
my_strdup(safe_str(global_system_variables.session_track_system_variables),
MYF(MY_WME | MY_THREAD_SPECIFIC));
}
@ -572,6 +571,12 @@ bool sysvartrack_global_update(THD *thd, char *str, size_t len)
{
LEX_STRING tmp= { str, len };
Session_sysvars_tracker::vars_list dummy;
DBUG_EXECUTE_IF("dbug_session_tracker_parse_error",
{
my_error(ER_OUTOFMEMORY, MYF(0), 1);
return true;
});
if (!dummy.parse_var_list(thd, tmp, false, system_charset_info))
{
dummy.construct_var_list(str, len + 1);

4
sql/sys_vars.inl
View File

@ -620,8 +620,12 @@ public:
{
if (sysvartrack_global_update(thd, new_val,
var->save_result.string_value.length))
{
if (new_val)
my_free(new_val);
new_val= 0;
}
}
global_update_finish(new_val);
return (new_val == 0 && var->save_result.string_value.str != 0);
}