fix for bug #17289 Events: missing privilege check for drop database

Events were executed with all privileges possible on planet Earth :(
WL#1034


mysql-test/r/events.result:
  update test results
mysql-test/t/events.test:
  test for bug#17289 Events: missing privilege check for drop database
sql/event.h:
  -add two new methods to event_timed to change and restore
   the security context
sql/event_executor.cc:
  - move code regarding privilieges checking to event_timed::execute()
  - add a new function evex_print_warnings() which prints the notes/warnings/errors
    to the console (easily capturable with logs-into-tables) so one can see what
    has happened if there was an error of some sort!
sql/event_timed.cc:
  - fix documentation
  - add a new error code -99, EVENT was revoked from the user on the DB
  - set_sec_ctx, execute, restore_sex_ctx
sql/sql_error.cc:
  - make warning_level_names public to be used in event_executor.cc
  - change from 2 arrays to a LEX_STRING array

1 files changed, 26 insertions, 1 deletions

diff --git a/mysql-test/r/events.result b/mysql-test/r/events.result
index b5b1b76f1a8..9b49ea24f26 100644
--- a/mysql-test/r/events.result
+++ b/mysql-test/r/events.result
@@ -1,5 +1,28 @@
 create database if not exists events_test;
 use events_test;
+CREATE USER pauline@localhost;
+CREATE DATABASE db_x;
+GRANT EVENT ON db_x.* TO pauline@localhost;
+USE db_x;
+CREATE TABLE x_table(a int);
+CREATE EVENT e_x1 ON SCHEDULE EVERY 1 SECOND DO DROP DATABASE db_x;
+CREATE EVENT e_x2 ON SCHEDULE EVERY 1 SECOND DO DROP TABLE x_table;
+SHOW DATABASES LIKE 'db_x';
+Database (db_x)
+db_x
+SET GLOBAL event_scheduler=1;
+SHOW DATABASES LIKE 'db_x';
+Database (db_x)
+db_x
+SHOW TABLES FROM db_x;
+Tables_in_db_x
+x_table
+SET GLOBAL event_scheduler=0;
+DROP EVENT e_x1;
+DROP EVENT e_x2;
+DROP DATABASE db_x;
+DROP USER pauline@localhost;
+USE events_test;
 drop event if exists event1;
 Warnings:
 Note	1305	Event event1 does not exist
@@ -166,7 +189,7 @@ show processlist;
 Id	User	Host	db	Command	Time	State	Info
 #	root	localhost	events_test	Query	#	NULL	show processlist
 #	event_scheduler		NULL	Connect	#	Sleeping	NULL
-#	root		events_test	Connect	#	User lock	select get_lock("test_lock2", 20)
+#	root	localhost	events_test	Connect	#	User lock	select get_lock("test_lock2", 20)
 "Release the mutex, the event worker should finish."
 select release_lock("test_lock2");
 release_lock("test_lock2")
@@ -184,6 +207,8 @@ set global event_scheduler=0;
 show processlist;
 Id	User	Host	db	Command	Time	State	Info
 #	root	localhost	events_test	Query	#	NULL	show processlist
+#	event_scheduler		NULL	Connect	#	Sleeping	NULL
+#	root	localhost	events_test	Connect	#	User lock	select get_lock("test_lock2_1", 20)
 "Release the lock so the child process should finish. Hence the scheduler also"
 select release_lock("test_lock2_1");
 release_lock("test_lock2_1")