BUG#41980 SBL, INSERT .. SELECT .. LIMIT = ERROR, even when @@SQL_LOG_BIN is 0 !

      
When binlog_format is STATEMENT and the statement is unsafe before,
the unsafe warning/error message was issued without checking
whether the SQL_LOG_BIN was turned on or not.
      
Fixed with adding a sql_log_bin_toplevel flag in THD to check
whether SQL_LOG_BIN is ON in current session whatever the current is in sp or not.

mysql-test/suite/binlog/r/binlog_unsafe.result

@@ -227,3 +227,86 @@ UPDATE t1 SET b = '%s%s%s%s%s%s%s%s%s%s%s%s%s%s' WHERE a = 'a' LIMIT 1;
 Warnings:
 Warning	1592	Statement is not safe to log in statement format.
 DROP TABLE t1;
+DROP TABLE IF EXISTS t1, t2;
+CREATE TABLE t1(i INT PRIMARY KEY);
+CREATE TABLE t2(i INT PRIMARY KEY);
+CREATE TABLE t3(i INT, ch CHAR(50));
+"Should issue message Statement is not safe to log in statement format."
+INSERT INTO t1 SELECT * FROM t2 LIMIT 1;
+Warnings:
+Warning	1592	Statement is not safe to log in statement format.
+CREATE FUNCTION func6()
+RETURNS INT
+BEGIN
+INSERT INTO t1 VALUES (10);
+INSERT INTO t1 VALUES (11);
+INSERT INTO t1 VALUES (12);
+RETURN 0;
+END|
+"Should issue message Statement is not safe to log in statement format only once"
+INSERT INTO t3 VALUES(func6(), UUID());
+Warnings:
+Warning	1592	Statement is not safe to log in statement format.
+"Check whether SET @@SQL_LOG_BIN = 0/1 doesn't work in substatements"
+CREATE FUNCTION fun_check_log_bin() RETURNS INT
+BEGIN
+SET @@SQL_LOG_BIN = 0;
+INSERT INTO t1 VALUES(@@global.sync_binlog);
+RETURN 100;
+END|
+"One unsafe warning should be issued in the following statement"
+SELECT fun_check_log_bin();
+fun_check_log_bin()
+100
+Warnings:
+Warning	1592	Statement is not safe to log in statement format.
+"SQL_LOG_BIN should be ON still"
+SHOW VARIABLES LIKE "SQL_LOG_BIN";
+Variable_name	Value
+sql_log_bin	ON
+set @save_log_bin = @@SESSION.SQL_LOG_BIN;
+set @@SESSION.SQL_LOG_BIN = 0;
+"Should NOT have any warning message issued in the following statements"
+INSERT INTO t1 SELECT * FROM t2 LIMIT 1;
+DROP TABLE t1,t2;
+"Should NOT have any warning message issued in the following func7() and trig"
+CREATE TABLE t1 (a INT);
+CREATE TABLE t2 (a CHAR(40));
+CREATE TABLE trigger_table (a CHAR(7));
+CREATE FUNCTION func7()
+RETURNS INT
+BEGIN
+INSERT INTO t1 VALUES (@@global.sync_binlog);
+INSERT INTO t1 VALUES (@@session.insert_id);
+INSERT INTO t2 SELECT UUID();
+INSERT INTO t2 VALUES (@@session.sql_mode);
+INSERT INTO t2 VALUES (@@global.init_slave);
+RETURN 0;
+END|
+SHOW VARIABLES LIKE "SQL_LOG_BIN";
+Variable_name	Value
+sql_log_bin	OFF
+SELECT func7();
+func7()
+0
+---- Insert from trigger ----
+CREATE TRIGGER trig
+BEFORE INSERT ON trigger_table
+FOR EACH ROW
+BEGIN
+INSERT INTO t1 VALUES (@@global.sync_binlog);
+INSERT INTO t1 VALUES (@@session.insert_id);
+INSERT INTO t1 VALUES (@@global.auto_increment_increment);
+INSERT INTO t2 SELECT UUID();
+INSERT INTO t2 VALUES (@@session.sql_mode);
+INSERT INTO t2 VALUES (@@global.init_slave);
+INSERT INTO t2 VALUES (@@hostname);
+END|
+INSERT INTO trigger_table VALUES ('bye.');
+DROP FUNCTION fun_check_log_bin;
+DROP FUNCTION func6;
+DROP FUNCTION func7;
+DROP TRIGGER  trig;
+DROP TABLE t1, t2, t3, trigger_table;
+set @@SESSION.SQL_LOG_BIN = @save_log_bin;
+"End of tests"

mysql-test/suite/binlog/t/binlog_unsafe.test

@@ -8,6 +8,7 @@
 # executed cannot be determined (e.g., INSERT DELAYED).  Such
 # statements should be marked unsafe.  All unsafe statements should
 # give a warning.
+# Yet the warning/error message isn't issued when SQL_LOG_BIN is turned off.
 #
 # This test verifies that a warning is generated for statements that
 # should be unsafe, when they are executed under statement mode
@@ -32,14 +33,19 @@
 # We try to insert the variables that should not be unsafe into a
 # table, and verify that *no* warning is issued.
 #
-#
+# Execute a unsafe statement calling a trigger or stored function
+# or neither when SQL_LOG_BIN is turned ON, a warning/error should be issued
+# Execute a unsafe statement calling a trigger or stored function
+# or neither when @@SQL_LOG_BIN is turned OFF,
+# no warning/error is issued
+
 # ==== Related bugs and worklogs ====
 #
 # WL#3339: Issue warnings when statement-based replication may fail
 # BUG#31168: @@hostname does not replicate
 # BUG#34732: mysqlbinlog does not print default values for auto_increment variables
 # BUG#34768: nondeterministic INSERT using LIMIT logged in stmt mode if binlog_format=mixed
-#
+# BUG#41980, SBL, INSERT .. SELECT .. LIMIT = ERROR, even when @@SQL_LOG_BIN is 0
 #
 # ==== Related test cases ====
 #
@@ -271,3 +277,96 @@ INSERT INTO t1 VALUES ('a','b');
 UPDATE t1 SET b = '%s%s%s%s%s%s%s%s%s%s%s%s%s%s' WHERE a = 'a' LIMIT 1;
 DROP TABLE t1;
 
+#
+#For bug#41980, SBL, INSERT .. SELECT .. LIMIT = ERROR, even when @@SQL_LOG_BIN is 0 
+#
+
+--disable_warnings
+DROP TABLE IF EXISTS t1, t2;
+--enable_warnings
+CREATE TABLE t1(i INT PRIMARY KEY);
+CREATE TABLE t2(i INT PRIMARY KEY);
+CREATE TABLE t3(i INT, ch CHAR(50));
+
+--echo "Should issue message Statement is not safe to log in statement format."
+INSERT INTO t1 SELECT * FROM t2 LIMIT 1;
+
+DELIMITER |;
+CREATE FUNCTION func6()
+RETURNS INT
+BEGIN
+  INSERT INTO t1 VALUES (10);
+  INSERT INTO t1 VALUES (11);
+  INSERT INTO t1 VALUES (12);
+  RETURN 0;
+END|
+DELIMITER ;|
+--echo "Should issue message Statement is not safe to log in statement format only once"
+INSERT INTO t3 VALUES(func6(), UUID());
+
+--echo "Check whether SET @@SQL_LOG_BIN = 0/1 doesn't work in substatements"
+DELIMITER |;
+CREATE FUNCTION fun_check_log_bin() RETURNS INT
+BEGIN
+  SET @@SQL_LOG_BIN = 0;
+  INSERT INTO t1 VALUES(@@global.sync_binlog);
+  RETURN 100;
+END|
+DELIMITER ;|
+--echo "One unsafe warning should be issued in the following statement"
+SELECT fun_check_log_bin();
+--echo "SQL_LOG_BIN should be ON still"
+SHOW VARIABLES LIKE "SQL_LOG_BIN";
+
+set @save_log_bin = @@SESSION.SQL_LOG_BIN;
+set @@SESSION.SQL_LOG_BIN = 0;
+--echo "Should NOT have any warning message issued in the following statements"
+INSERT INTO t1 SELECT * FROM t2 LIMIT 1;
+DROP TABLE t1,t2;
+
+--echo "Should NOT have any warning message issued in the following func7() and trig"
+CREATE TABLE t1 (a INT);
+CREATE TABLE t2 (a CHAR(40));
+CREATE TABLE trigger_table (a CHAR(7));
+DELIMITER |;
+CREATE FUNCTION func7()
+RETURNS INT
+BEGIN
+  INSERT INTO t1 VALUES (@@global.sync_binlog);
+  INSERT INTO t1 VALUES (@@session.insert_id);
+  INSERT INTO t2 SELECT UUID();
+  INSERT INTO t2 VALUES (@@session.sql_mode);
+  INSERT INTO t2 VALUES (@@global.init_slave);
+  RETURN 0;
+END|
+DELIMITER ;|
+SHOW VARIABLES LIKE "SQL_LOG_BIN";
+SELECT func7();
+
+--echo ---- Insert from trigger ----
+
+DELIMITER |;
+CREATE TRIGGER trig
+BEFORE INSERT ON trigger_table
+FOR EACH ROW
+BEGIN
+  INSERT INTO t1 VALUES (@@global.sync_binlog);
+  INSERT INTO t1 VALUES (@@session.insert_id);
+  INSERT INTO t1 VALUES (@@global.auto_increment_increment);
+  INSERT INTO t2 SELECT UUID();
+  INSERT INTO t2 VALUES (@@session.sql_mode);
+  INSERT INTO t2 VALUES (@@global.init_slave);
+  INSERT INTO t2 VALUES (@@hostname);
+END|
+DELIMITER ;|
+
+INSERT INTO trigger_table VALUES ('bye.');
+
+#clean up
+DROP FUNCTION fun_check_log_bin;
+DROP FUNCTION func6;
+DROP FUNCTION func7;
+DROP TRIGGER  trig;
+DROP TABLE t1, t2, t3, trigger_table;
+set @@SESSION.SQL_LOG_BIN = @save_log_bin;
+--echo "End of tests"

sql/set_var.cc

@@ -110,6 +110,7 @@ static void sys_default_init_connect(THD*, enum_var_type type);
 static bool sys_update_init_slave(THD*, set_var*);
 static void sys_default_init_slave(THD*, enum_var_type type);
 static bool set_option_bit(THD *thd, set_var *var);
+static bool set_option_log_bin_bit(THD *thd, set_var *var);
 static bool set_option_autocommit(THD *thd, set_var *var);
 static int  check_log_update(THD *thd, set_var *var);
 static bool set_log_update(THD *thd, set_var *var);
@@ -731,7 +732,7 @@ static sys_var_thd_bit	sys_log_update(&vars, "sql_log_update",
 				       OPTION_BIN_LOG);
 static sys_var_thd_bit	sys_log_binlog(&vars, "sql_log_bin",
                                        check_log_update,
-				       set_option_bit,
+                                       set_option_log_bin_bit,
 				       OPTION_BIN_LOG);
 static sys_var_thd_bit	sys_sql_warnings(&vars, "sql_warnings", 0,
 					 set_option_bit,
@@ -2963,6 +2964,16 @@ static bool set_option_bit(THD *thd, set_var *var)
   return 0;
 }
 
+/*
+  Functions to be only used to update thd->options OPTION_BIN_LOG bit
+*/
+static bool set_option_log_bin_bit(THD *thd, set_var *var)
+{
+  set_option_bit(thd, var);
+  if (!thd->in_sub_stmt)
+    thd->sql_log_bin_toplevel= thd->options & OPTION_BIN_LOG;
+  return 0;
+}
 
 static bool set_option_autocommit(THD *thd, set_var *var)
 {

sql/sql_class.cc

@@ -538,6 +538,7 @@ THD::THD()
    Open_tables_state(refresh_version), rli_fake(0),
    lock_id(&main_lock_id),
    user_time(0), in_sub_stmt(0),
+   sql_log_bin_toplevel(false),
    binlog_table_maps(0), binlog_flags(0UL),
    table_map_for_update(0),
    arg_of_last_insert_id_function(FALSE),
@@ -787,6 +788,7 @@ void THD::init(void)
   update_charset();
   reset_current_stmt_binlog_row_based();
   bzero((char *) &status_var, sizeof(status_var));
+  sql_log_bin_toplevel= options & OPTION_BIN_LOG;
 }
 
 
@@ -3662,7 +3664,7 @@ int THD::binlog_query(THD::enum_binlog_query_type qtype, char const *query_arg,
     If we are in statement mode and trying to log an unsafe statement,
     we should print a warning.
   */
-  if (lex->is_stmt_unsafe() &&
+  if (sql_log_bin_toplevel && lex->is_stmt_unsafe() &&
       variables.binlog_format == BINLOG_FORMAT_STMT)
   {
     push_warning(this, MYSQL_ERROR::WARN_LEVEL_WARN,

sql/sql_class.h

@@ -1350,6 +1350,8 @@ public:
 
   /* <> 0 if we are inside of trigger or stored function. */
   uint in_sub_stmt;
+  /* TRUE when the current top has SQL_LOG_BIN ON */
+  bool sql_log_bin_toplevel;
 
   /* container for handler's private per-connection data */
   Ha_data ha_data[MAX_HA];