mariadb/CVE-2021-27928.patch

diff --git a/mysql-test/suite/galera/disabled.def b/mysql-test/suite/galera/disabled.def
index c3b5e070158..6d9e198271c 100644
--- a/mysql-test/suite/galera/disabled.def
+++ b/mysql-test/suite/galera/disabled.def
@@ -37,3 +37,4 @@ galera_ist_progress: MDEV-15236 galera_ist_progress fails when trying to read tr
 galera_concurrent_ctas : MDEV-15845 Test failure on galera.galera_concurrent_ctas
 pxc-421: Lock timeout exceeded
 galera_sst_mysqldump_with_key : MDEV-16890 Galera test failure
+pxc-421: wsrep_provider is read-only for security reasons
diff --git a/mysql-test/suite/galera/include/galera_load_provider.inc b/mysql-test/suite/galera/include/galera_load_provider.inc
index aeab7e6ea19..e6ce6411193 100644
--- a/mysql-test/suite/galera/include/galera_load_provider.inc
+++ b/mysql-test/suite/galera/include/galera_load_provider.inc
@@ -1,7 +1,6 @@
 --echo Loading wsrep provider ...
 
 --disable_query_log
---eval SET GLOBAL wsrep_provider = '$wsrep_provider_orig';
 --eval SET GLOBAL wsrep_cluster_address = '$wsrep_cluster_address_orig';
 --enable_query_log
 
diff --git a/mysql-test/suite/galera/include/galera_unload_provider.inc b/mysql-test/suite/galera/include/galera_unload_provider.inc
index edc7eb31e0e..83438a947f0 100644
--- a/mysql-test/suite/galera/include/galera_unload_provider.inc
+++ b/mysql-test/suite/galera/include/galera_unload_provider.inc
@@ -1,7 +1,6 @@
 --echo Unloading wsrep provider ...
 
 --let $wsrep_cluster_address_orig = `SELECT @@wsrep_cluster_address`
---let $wsrep_provider_orig = `SELECT @@wsrep_provider`
 --let $wsrep_provider_options_orig = `SELECT @@wsrep_provider_options`
 
-SET GLOBAL wsrep_provider = 'none';
+SET GLOBAL wsrep_cluster_address = '';
diff --git a/mysql-test/suite/galera/r/galera_ist_rsync.result b/mysql-test/suite/galera/r/galera_ist_rsync.result
index 9c0d78d96e9..16d13ef261f 100644
--- a/mysql-test/suite/galera/r/galera_ist_rsync.result
+++ b/mysql-test/suite/galera/r/galera_ist_rsync.result
@@ -21,7 +21,7 @@ INSERT INTO t1 VALUES ('node2_committed_before');
 INSERT INTO t1 VALUES ('node2_committed_before');
 COMMIT;
 Unloading wsrep provider ...
-SET GLOBAL wsrep_provider = 'none';
+SET GLOBAL wsrep_cluster_address = '';
 connection node_1;
 SET AUTOCOMMIT=OFF;
 START TRANSACTION;
diff --git a/mysql-test/suite/galera/r/galera_sst_mysqldump.result b/mysql-test/suite/galera/r/galera_sst_mysqldump.result
index 5c530c32ce6..6bdc933a9fc 100644
--- a/mysql-test/suite/galera/r/galera_sst_mysqldump.result
+++ b/mysql-test/suite/galera/r/galera_sst_mysqldump.result
@@ -30,7 +30,7 @@ INSERT INTO t1 VALUES ('node2_committed_before');
 INSERT INTO t1 VALUES ('node2_committed_before');
 COMMIT;
 Unloading wsrep provider ...
-SET GLOBAL wsrep_provider = 'none';
+SET GLOBAL wsrep_cluster_address = '';
 connection node_1;
 SET AUTOCOMMIT=OFF;
 START TRANSACTION;
diff --git a/mysql-test/suite/galera/r/mysql-wsrep#33.result b/mysql-test/suite/galera/r/mysql-wsrep#33.result
index 6a5251204b9..4cc49c0cf07 100644
--- a/mysql-test/suite/galera/r/mysql-wsrep#33.result
+++ b/mysql-test/suite/galera/r/mysql-wsrep#33.result
@@ -30,7 +30,7 @@ INSERT INTO t1 VALUES ('node2_committed_before');
 INSERT INTO t1 VALUES ('node2_committed_before');
 COMMIT;
 Unloading wsrep provider ...
-SET GLOBAL wsrep_provider = 'none';
+SET GLOBAL wsrep_cluster_address = '';
 connection node_1;
 SET AUTOCOMMIT=OFF;
 START TRANSACTION;
diff --git a/mysql-test/suite/sys_vars/r/sysvars_wsrep.result b/mysql-test/suite/sys_vars/r/sysvars_wsrep.result
index db932ae8223..921172920f1 100644
--- a/mysql-test/suite/sys_vars/r/sysvars_wsrep.result
+++ b/mysql-test/suite/sys_vars/r/sysvars_wsrep.result
@@ -335,7 +335,7 @@ NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	NULL
-READ_ONLY	NO
+READ_ONLY	YES
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	WSREP_ON
 SESSION_VALUE	OFF
@@ -391,7 +391,7 @@ NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	NULL
-READ_ONLY	NO
+READ_ONLY	YES
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	WSREP_PROVIDER_OPTIONS
 SESSION_VALUE	NULL
diff --git a/mysql-test/suite/sys_vars/r/wsrep_notify_cmd_basic.result b/mysql-test/suite/sys_vars/r/wsrep_notify_cmd_basic.result
deleted file mode 100644
index 056ff8c817b..00000000000
--- a/mysql-test/suite/sys_vars/r/wsrep_notify_cmd_basic.result
+++ /dev/null
@@ -1,47 +0,0 @@
-#
-# wsrep_notify_cmd
-#
-call mtr.add_suppression("WSREP: Failed to get provider options");
-# save the initial value
-SET @wsrep_notify_cmd_global_saved = @@global.wsrep_notify_cmd;
-# default
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-
-
-# scope
-SELECT @@session.wsrep_notify_cmd;
-ERROR HY000: Variable 'wsrep_notify_cmd' is a GLOBAL variable
-SET @@global.wsrep_notify_cmd='notify_cmd';
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-notify_cmd
-
-# valid values
-SET @@global.wsrep_notify_cmd='command';
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-command
-SET @@global.wsrep_notify_cmd='hyphenated-command';
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-hyphenated-command
-SET @@global.wsrep_notify_cmd=default;
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-
-SET @@global.wsrep_notify_cmd=NULL;
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-NULL
-
-# invalid values
-SET @@global.wsrep_notify_cmd=1;
-ERROR 42000: Incorrect argument type to variable 'wsrep_notify_cmd'
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-NULL
-
-# restore the initial value
-SET @@global.wsrep_notify_cmd = @wsrep_notify_cmd_global_saved;
-# End of test
diff --git a/mysql-test/suite/sys_vars/r/wsrep_provider_basic.result b/mysql-test/suite/sys_vars/r/wsrep_provider_basic.result
deleted file mode 100644
index 3e4ac8ca883..00000000000
--- a/mysql-test/suite/sys_vars/r/wsrep_provider_basic.result
+++ /dev/null
@@ -1,40 +0,0 @@
-#
-# wsrep_provider
-#
-# save the initial value
-SET @wsrep_provider_global_saved = @@global.wsrep_provider;
-# default
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-
-# scope
-SELECT @@session.wsrep_provider;
-ERROR HY000: Variable 'wsrep_provider' is a GLOBAL variable
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-
-# valid values
-SET @@global.wsrep_provider=default;
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-
-# invalid values
-SET @@global.wsrep_provider='/invalid/libgalera_smm.so';
-ERROR 42000: Variable 'wsrep_provider' can't be set to the value of '/invalid/libgalera_smm.so'
-SET @@global.wsrep_provider=NULL;
-ERROR 42000: Variable 'wsrep_provider' can't be set to the value of 'NULL'
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-SET @@global.wsrep_provider=1;
-ERROR 42000: Incorrect argument type to variable 'wsrep_provider'
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-
-# restore the initial value
-SET @@global.wsrep_provider = @wsrep_provider_global_saved;
-# End of test
diff --git a/mysql-test/suite/sys_vars/r/wsrep_provider_options_basic.result b/mysql-test/suite/sys_vars/r/wsrep_provider_options_basic.result
deleted file mode 100644
index b2e07c55b38..00000000000
--- a/mysql-test/suite/sys_vars/r/wsrep_provider_options_basic.result
+++ /dev/null
@@ -1,49 +0,0 @@
-#
-# wsrep_provider_options
-#
-call mtr.add_suppression("WSREP: Failed to get provider options");
-SET @@global.wsrep_provider =  @@global.wsrep_provider;
-# save the initial value
-SET @wsrep_provider_options_global_saved = @@global.wsrep_provider_options;
-# default
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-
-# scope
-SELECT @@session.wsrep_provider_options;
-ERROR HY000: Variable 'wsrep_provider_options' is a GLOBAL variable
-SET @@global.wsrep_provider_options='option1';
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-option1
-
-# valid values
-SET @@global.wsrep_provider_options='name1=value1;name2=value2';
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-name1=value1;name2=value2
-SET @@global.wsrep_provider_options='hyphenated-name:value';
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-hyphenated-name:value
-SET @@global.wsrep_provider_options=default;
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-
-# invalid values
-SET @@global.wsrep_provider_options=1;
-ERROR 42000: Incorrect argument type to variable 'wsrep_provider_options'
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-SET @@global.wsrep_provider_options=NULL;
-Got one of the listed errors
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-NULL
-
-# restore the initial value
-SET @@global.wsrep_provider_options = @wsrep_provider_options_global_saved;
-# End of test
diff --git a/mysql-test/suite/sys_vars/t/wsrep_notify_cmd_basic.test b/mysql-test/suite/sys_vars/t/wsrep_notify_cmd_basic.test
deleted file mode 100644
index 6d1535ba148..00000000000
--- a/mysql-test/suite/sys_vars/t/wsrep_notify_cmd_basic.test
+++ /dev/null
@@ -1,43 +0,0 @@
---source include/have_wsrep.inc
-
---echo #
---echo # wsrep_notify_cmd
---echo #
-
-call mtr.add_suppression("WSREP: Failed to get provider options");
-
---echo # save the initial value
-SET @wsrep_notify_cmd_global_saved = @@global.wsrep_notify_cmd;
-
---echo # default
-SELECT @@global.wsrep_notify_cmd;
-
---echo
---echo # scope
---error ER_INCORRECT_GLOBAL_LOCAL_VAR
-SELECT @@session.wsrep_notify_cmd;
-SET @@global.wsrep_notify_cmd='notify_cmd';
-SELECT @@global.wsrep_notify_cmd;
-
---echo
---echo # valid values
-SET @@global.wsrep_notify_cmd='command';
-SELECT @@global.wsrep_notify_cmd;
-SET @@global.wsrep_notify_cmd='hyphenated-command';
-SELECT @@global.wsrep_notify_cmd;
-SET @@global.wsrep_notify_cmd=default;
-SELECT @@global.wsrep_notify_cmd;
-SET @@global.wsrep_notify_cmd=NULL;
-SELECT @@global.wsrep_notify_cmd;
-
---echo
---echo # invalid values
---error ER_WRONG_TYPE_FOR_VAR
-SET @@global.wsrep_notify_cmd=1;
-SELECT @@global.wsrep_notify_cmd;
-
---echo
---echo # restore the initial value
-SET @@global.wsrep_notify_cmd = @wsrep_notify_cmd_global_saved;
-
---echo # End of test
diff --git a/mysql-test/suite/sys_vars/t/wsrep_provider_basic.test b/mysql-test/suite/sys_vars/t/wsrep_provider_basic.test
deleted file mode 100644
index 1190ab41bb0..00000000000
--- a/mysql-test/suite/sys_vars/t/wsrep_provider_basic.test
+++ /dev/null
@@ -1,39 +0,0 @@
---source include/have_wsrep.inc
-
---echo #
---echo # wsrep_provider
---echo #
-
---echo # save the initial value
-SET @wsrep_provider_global_saved = @@global.wsrep_provider;
-
---echo # default
-SELECT @@global.wsrep_provider;
-
---echo
---echo # scope
---error ER_INCORRECT_GLOBAL_LOCAL_VAR
-SELECT @@session.wsrep_provider;
-SELECT @@global.wsrep_provider;
-
---echo
---echo # valid values
-SET @@global.wsrep_provider=default;
-SELECT @@global.wsrep_provider;
-
---echo
---echo # invalid values
---error ER_WRONG_VALUE_FOR_VAR
-SET @@global.wsrep_provider='/invalid/libgalera_smm.so';
---error ER_WRONG_VALUE_FOR_VAR
-SET @@global.wsrep_provider=NULL;
-SELECT @@global.wsrep_provider;
---error ER_WRONG_TYPE_FOR_VAR
-SET @@global.wsrep_provider=1;
-SELECT @@global.wsrep_provider;
-
---echo
---echo # restore the initial value
-SET @@global.wsrep_provider = @wsrep_provider_global_saved;
-
---echo # End of test
diff --git a/mysql-test/suite/sys_vars/t/wsrep_provider_options_basic.test b/mysql-test/suite/sys_vars/t/wsrep_provider_options_basic.test
deleted file mode 100644
index d2ea32a0637..00000000000
--- a/mysql-test/suite/sys_vars/t/wsrep_provider_options_basic.test
+++ /dev/null
@@ -1,51 +0,0 @@
---source include/have_wsrep.inc
-
---echo #
---echo # wsrep_provider_options
---echo #
-
-call mtr.add_suppression("WSREP: Failed to get provider options");
-
-SET @@global.wsrep_provider =  @@global.wsrep_provider;
-
---echo # save the initial value
-SET @wsrep_provider_options_global_saved = @@global.wsrep_provider_options;
-
---echo # default
-SELECT @@global.wsrep_provider_options;
-
---echo
---echo # scope
---error ER_INCORRECT_GLOBAL_LOCAL_VAR
-SELECT @@session.wsrep_provider_options;
---error 0,ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options='option1';
-SELECT @@global.wsrep_provider_options;
-
---echo
---echo # valid values
---error 0,ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options='name1=value1;name2=value2';
-SELECT @@global.wsrep_provider_options;
---error 0,ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options='hyphenated-name:value';
-SELECT @@global.wsrep_provider_options;
---error 0,ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options=default;
-SELECT @@global.wsrep_provider_options;
-
---echo
---echo # invalid values
---error ER_WRONG_TYPE_FOR_VAR
-SET @@global.wsrep_provider_options=1;
-SELECT @@global.wsrep_provider_options;
---error ER_WRONG_ARGUMENTS,ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options=NULL;
-SELECT @@global.wsrep_provider_options;
-
---echo
---echo # restore the initial value
---error 0,ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options = @wsrep_provider_options_global_saved;
-
---echo # End of test
diff --git a/mysql-test/suite/wsrep/disabled.def b/mysql-test/suite/wsrep/disabled.def
index c7c8f2c6216..b5304b1c992 100644
--- a/mysql-test/suite/wsrep/disabled.def
+++ b/mysql-test/suite/wsrep/disabled.def
@@ -1,2 +1,4 @@
 wsrep.foreign_key : Sporadic failure "WSREP has not yet prepared node for application use"
 
+
+mdev_6832: wsrep_provider is read-only for security reasons
diff --git a/mysql-test/suite/wsrep/r/variables.result b/mysql-test/suite/wsrep/r/variables.result
index b6f22828532..c944af8c90d 100644
--- a/mysql-test/suite/wsrep/r/variables.result
+++ b/mysql-test/suite/wsrep/r/variables.result
@@ -13,7 +13,6 @@ SET SESSION wsrep_replicate_myisam= ON;
 ERROR HY000: Variable 'wsrep_replicate_myisam' is a GLOBAL variable and should be set with SET GLOBAL
 SET GLOBAL wsrep_replicate_myisam= ON;
 SET GLOBAL wsrep_replicate_myisam= OFF;
-SET GLOBAL wsrep_provider=none;
 #
 # MDEV#5790: SHOW GLOBAL STATUS LIKE does not show the correct list of
 # variables when using "_"
@@ -134,10 +133,6 @@ wsrep_local_state_comment	#
 # Should show nothing.
 SHOW STATUS LIKE 'x';
 Variable_name	Value
-SET GLOBAL wsrep_provider=none;
-#
-# MDEV#6079: xtrabackup SST failing with maria-10.0-galera
-#
 
 SHOW STATUS LIKE 'wsrep_local_state_uuid';
 Variable_name	Value
@@ -146,7 +141,6 @@ wsrep_local_state_uuid	#
 SHOW STATUS LIKE 'wsrep_last_committed';
 Variable_name	Value
 wsrep_last_committed	#
-SET GLOBAL wsrep_provider=none;
 
 #
 # MDEV#6206: wsrep_slave_threads subtracts from max_connections
@@ -160,30 +154,29 @@ SELECT @@global.wsrep_slave_threads;
 1
 SELECT @@global.wsrep_cluster_address;
 @@global.wsrep_cluster_address
-
+gcomm://
 SHOW STATUS LIKE 'threads_connected';
 Variable_name	Value
 Threads_connected	1
 SHOW STATUS LIKE 'wsrep_thread_count';
 Variable_name	Value
-wsrep_thread_count	0
+wsrep_thread_count	2
 
 SELECT @@global.wsrep_provider;
 @@global.wsrep_provider
 libgalera_smm.so
 SELECT @@global.wsrep_cluster_address;
 @@global.wsrep_cluster_address
-
+gcomm://
 SHOW STATUS LIKE 'threads_connected';
 Variable_name	Value
 Threads_connected	1
 SHOW STATUS LIKE 'wsrep_thread_count';
 Variable_name	Value
-wsrep_thread_count	0
+wsrep_thread_count	2
 
 # Setting wsrep_cluster_address triggers the creation of
 # applier/rollbacker threads.
-SET GLOBAL wsrep_cluster_address= 'gcomm://';
 # Wait for applier threads to get created.
 SELECT @@global.wsrep_provider;
 @@global.wsrep_provider
diff --git a/mysql-test/suite/wsrep/t/variables.test b/mysql-test/suite/wsrep/t/variables.test
index 1315f090d5c..867af600817 100644
--- a/mysql-test/suite/wsrep/t/variables.test
+++ b/mysql-test/suite/wsrep/t/variables.test
@@ -18,7 +18,7 @@ SET GLOBAL wsrep_replicate_myisam= ON;
 
 # Reset it back.
 SET GLOBAL wsrep_replicate_myisam= OFF;
-SET GLOBAL wsrep_provider=none;
+#SET GLOBAL wsrep_provider=none;
 
 --echo #
 --echo # MDEV#5790: SHOW GLOBAL STATUS LIKE does not show the correct list of
@@ -27,11 +27,9 @@ SET GLOBAL wsrep_provider=none;
 
 CALL mtr.add_suppression("WSREP: Could not open saved state file for reading.*");
 
---disable_query_log
-eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
---let $galera_version=25.3.17
+#evalp SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
+--let $galera_version=25.3.24
 source include/check_galera_version.inc;
---enable_query_log
 
 --replace_column 2 #
 SHOW GLOBAL STATUS LIKE 'wsrep%';
@@ -47,15 +45,13 @@ SHOW GLOBAL STATUS LIKE 'wsrep_local_state_comment';
 SHOW STATUS LIKE 'x';
 
 # Reset it back.
-SET GLOBAL wsrep_provider=none;
+#SET GLOBAL wsrep_provider=none;
 
 --echo #
 --echo # MDEV#6079: xtrabackup SST failing with maria-10.0-galera
 --echo #
 
---disable_query_log
-eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
---enable_query_log
+#evalp SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
 
 # The following 2 variables are used in innobackupex during xtrabackup-based
 # SST.
@@ -67,7 +63,7 @@ SHOW STATUS LIKE 'wsrep_local_state_uuid';
 SHOW STATUS LIKE 'wsrep_last_committed';
 
 # Reset it back.
-SET GLOBAL wsrep_provider=none;
+#SET GLOBAL wsrep_provider=none;
 
 --echo
 --echo #
@@ -75,9 +71,7 @@ SET GLOBAL wsrep_provider=none;
 --echo #
 call mtr.add_suppression("WSREP: Failed to get provider options");
 
---disable_query_log
-eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
---enable_query_log
+#evalp SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
 
 --replace_regex /.*libgalera_smm.*/libgalera_smm.so/
 SELECT @@global.wsrep_provider;
@@ -87,9 +81,7 @@ SHOW STATUS LIKE 'threads_connected';
 SHOW STATUS LIKE 'wsrep_thread_count';
 --echo
 
---disable_query_log
-eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
---enable_query_log
+#evalp SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
 
 --replace_regex /.*libgalera_smm.*/libgalera_smm.so/
 SELECT @@global.wsrep_provider;
@@ -100,7 +92,7 @@ SHOW STATUS LIKE 'wsrep_thread_count';
 
 --echo # Setting wsrep_cluster_address triggers the creation of
 --echo # applier/rollbacker threads.
-SET GLOBAL wsrep_cluster_address= 'gcomm://';
+#SET GLOBAL wsrep_cluster_address= 'gcomm://';
 --echo # Wait for applier threads to get created.
 sleep 3; 
 
diff --git a/sql/sys_vars.cc b/sql/sys_vars.cc
index 8858259c863..90ca973052b 100644
--- a/sql/sys_vars.cc
+++ b/sql/sys_vars.cc
@@ -5236,7 +5236,7 @@ static Sys_var_tz Sys_time_zone(
 
 static Sys_var_charptr Sys_wsrep_provider(
        "wsrep_provider", "Path to replication provider library",
-       PREALLOCATED GLOBAL_VAR(wsrep_provider), CMD_LINE(REQUIRED_ARG),
+       PREALLOCATED READ_ONLY GLOBAL_VAR(wsrep_provider), CMD_LINE(REQUIRED_ARG),
        IN_FS_CHARSET, DEFAULT(WSREP_NONE),
        NO_MUTEX_GUARD, NOT_IN_BINLOG,
        ON_CHECK(wsrep_provider_check), ON_UPDATE(wsrep_provider_update));
@@ -5406,7 +5406,7 @@ static Sys_var_ulong Sys_wsrep_max_ws_rows (
 
 static Sys_var_charptr Sys_wsrep_notify_cmd(
        "wsrep_notify_cmd", "",
-       GLOBAL_VAR(wsrep_notify_cmd),CMD_LINE(REQUIRED_ARG),
+       READ_ONLY GLOBAL_VAR(wsrep_notify_cmd), CMD_LINE(REQUIRED_ARG),
        IN_SYSTEM_CHARSET, DEFAULT(""));
 
 static Sys_var_mybool Sys_wsrep_certify_nonPK(