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MDEV-41506
mariadb/scripts/sys_schema/functions/format_path.sql
Oleksandr Byelkin 6c951fea5f MDEV-39993 Use CREATE OR REPLACE for sys schema routines 
mariadb-upgrade silently dropped EXECUTE grants on sys schema stored
functions and procedures. The sys schema install scripts reinstalled
every routine with DROP FUNCTION/PROCEDURE IF EXISTS followed by
CREATE. DROP cascades to delete the routine's rows in
mysql.procs_priv, so any EXECUTE grant a DBA had issued on e.g.
sys.table_exists or sys.quote_identifier was lost every time
mariadb-upgrade reinstalled the sys schema, even though the routine
itself came back unchanged.

Fix: replace DROP ... IF EXISTS + CREATE with CREATE OR REPLACE in
all 53 sys_schema function/procedure files and in the two templates
(templates/function.sql, templates/procedure.sql) so future routines
follow the same pattern. CREATE OR REPLACE PROCEDURE/FUNCTION goes
through sp_drop_routine_internal(), which only deletes the
mysql.proc row and never reaches sp_revoke_privileges() (that is
only called from the explicit DROP PROCEDURE/FUNCTION statement),
so mysql.procs_priv is left untouched and existing grants survive.
This mirrors the pattern already used by sys schema views
(CREATE OR REPLACE ... VIEW, since MDEV-9077), which never had this
problem.

Four of the converted files (functions/format_path.sql,
functions/ps_is_account_enabled_57.sql,
procedures/ps_setup_reset_to_default.sql,
procedures/ps_trace_thread_57.sql) are not referenced by
scripts/sys_schema/CMakeLists.txt; they were converted anyway for
consistency and have no behavioural effect.

As a side effect, a pre-existing UDF whose name collides with a sys
routine name is no longer destroyed before the reinstall fails:
DROP FUNCTION IF EXISTS resolved the UDF namespace first, silently
dropping the UDF and then failing on ER_SP_ALREADY_EXISTS anyway;
CREATE OR REPLACE fails immediately on ER_UDF_EXISTS with the UDF
intact.

scripts/maria_add_gis_sp.sql.in and the sys_config triggers were
deliberately left untouched: the GIS procedures are only
re-installed at bootstrap time (mariadb-upgrade instead patches
their definer in place via UPDATE), and triggers carry no
procs_priv rows, so neither is on the code path this bug is about.

Added mysql-test/main/mysql_upgrade_sys_routine_grants.test, which
grants EXECUTE on sys.table_exists and sys.quote_identifier,
overwrites both routine bodies with a marker to prove the upgrade
actually reinstalls them (rather than the sys schema install being
skipped), runs mariadb-upgrade, and checks both that the grants
survived and that the real routine bodies came back.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-09-21 17:07:02 +02:00

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-- Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; version 2 of the License.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
DELIMITER $$
CREATE OR REPLACE DEFINER='mariadb.sys'@'localhost' FUNCTION format_path (
in_path VARCHAR(512)
)
RETURNS VARCHAR(512) CHARSET UTF8
COMMENT '
Description
-----------
Takes a raw path value, and strips out the datadir or tmpdir
replacing with @@datadir and @@tmpdir respectively.
Also normalizes the paths across operating systems, so backslashes
on Windows are converted to forward slashes
Parameters
-----------
path (VARCHAR(512)):
The raw file path value to format.
Returns
-----------
VARCHAR(512) CHARSET UTF8
Example
-----------
mysql> select @@datadir;
+-----------------------------------------------+
| @@datadir |
+-----------------------------------------------+
| /Users/mark/sandboxes/SmallTree/AMaster/data/ |
+-----------------------------------------------+
1 row in set (0.06 sec)
mysql> select format_path(\'/Users/mark/sandboxes/SmallTree/AMaster/data/mysql/proc.MYD\') AS path;
+--------------------------+
| path |
+--------------------------+
| @@datadir/mysql/proc.MYD |
+--------------------------+
1 row in set (0.03 sec)
'
SQL SECURITY INVOKER
DETERMINISTIC
NO SQL
BEGIN
DECLARE v_path VARCHAR(512);
DECLARE v_undo_dir VARCHAR(1024);
DECLARE v_innodb_data_home_dir VARCHAR(1024);
DECLARE v_innodb_log_group_home_dir VARCHAR(1024);
DECLARE path_separator CHAR(1) DEFAULT '/';
IF @@global.version_compile_os LIKE 'win%' THEN
SET path_separator = '\\';
END IF;
-- OSX hides /private/ in variables, but Performance Schema does not
IF in_path LIKE '/private/%' THEN
SET v_path = REPLACE(in_path, '/private', '');
ELSE
SET v_path = in_path;
END IF;
-- @@global.innodb_undo_directory is only set when separate undo logs are used
SET v_undo_dir = IFNULL((SELECT VARIABLE_VALUE FROM information_schema.global_variables WHERE VARIABLE_NAME = 'innodb_undo_directory'), '');
SET v_innodb_data_home_dir= IFNULL((SELECT VARIABLE_VALUE FROM information_schema.global_variables WHERE VARIABLE_NAME = 'innodb_data_home_dir'), '');
SET v_innodb_log_group_home_dir= IFNULL((SELECT VARIABLE_VALUE FROM information_schema.global_variables WHERE VARIABLE_NAME = 'innodb_log_group_home_dir'), '');
IF v_path IS NULL THEN
RETURN NULL;
ELSEIF v_path LIKE CONCAT(@@global.datadir, IF(SUBSTRING(@@global.datadir, -1) = path_separator, '%', CONCAT(path_separator, '%'))) ESCAPE '|' THEN
SET v_path = REPLACE(v_path, @@global.datadir, CONCAT('@@datadir', IF(SUBSTRING(@@global.datadir, -1) = path_separator, path_separator, '')));
ELSEIF v_path LIKE CONCAT(@@global.tmpdir, IF(SUBSTRING(@@global.tmpdir, -1) = path_separator, '%', CONCAT(path_separator, '%'))) ESCAPE '|' THEN
SET v_path = REPLACE(v_path, @@global.tmpdir, CONCAT('@@tmpdir', IF(SUBSTRING(@@global.tmpdir, -1) = path_separator, path_separator, '')));
# ELSEIF v_path LIKE CONCAT(@@global.slave_load_tmpdir, IF(SUBSTRING(@@global.slave_load_tmpdir, -1) = path_separator, '%', CONCAT(path_separator, '%'))) ESCAPE '|' THEN
# SET v_path = REPLACE(v_path, @@global.slave_load_tmpdir, CONCAT('@@slave_load_tmpdir', IF(SUBSTRING(@@global.slave_load_tmpdir, -1) = path_separator, path_separator, '')));
ELSEIF v_path LIKE CONCAT(v_innodb_data_home_dir, IF(SUBSTRING(v_innodb_data_home_dir, -1) = path_separator, '%', CONCAT(path_separator, '%'))) ESCAPE '|' THEN
SET v_path = REPLACE(v_path, v_innodb_data_home_dir, CONCAT('@@innodb_data_home_dir', IF(SUBSTRING(v_innodb_data_home_dir, -1) = path_separator, path_separator, '')));
ELSEIF v_path LIKE CONCAT(v_innodb_log_group_home_dir, IF(SUBSTRING(v_innodb_log_group_home_dir, -1) = path_separator, '%', CONCAT(path_separator, '%'))) ESCAPE '|' THEN
SET v_path = REPLACE(v_path, v_innodb_log_group_home_dir, CONCAT('@@innodb_log_group_home_dir', IF(SUBSTRING(v_innodb_log_group_home_dir, -1) = path_separator, path_separator, '')));
ELSEIF v_path LIKE CONCAT(v_undo_dir, IF(SUBSTRING(v_undo_dir, -1) = path_separator, '%', CONCAT(path_separator, '%'))) ESCAPE '|' THEN
SET v_path = REPLACE(v_path, v_undo_dir, CONCAT('@@innodb_undo_directory', IF(SUBSTRING(v_undo_dir, -1) = path_separator, path_separator, '')));
ELSEIF v_path LIKE CONCAT(@@global.basedir, IF(SUBSTRING(@@global.basedir, -1) = path_separator, '%', CONCAT(path_separator, '%'))) ESCAPE '|' THEN
SET v_path = REPLACE(v_path, @@global.basedir, CONCAT('@@basedir', IF(SUBSTRING(@@global.basedir, -1) = path_separator, path_separator, '')));
END IF;
RETURN v_path;
END$$
DELIMITER ;
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