Bug#17279 user with no global privs and with create priv in db can create databases

 - Use binary charset in acl_cache, to make searches case sensitive
 - Add testcase 


mysql-test/r/grant2.result:
  Update test result
mysql-test/t/grant2.test:
  Add test case for bug#17279, checking that user with access to TESTDB can't create TEStdb
sql/sql_acl.cc:
  Use binary charset for the acl_cache to make the hash lookups case sensitive.
  Thus denying user with access to "TESTDB" access to "TEStdb"

mysql-test/r/grant2.result

@@ -334,3 +334,25 @@ lock table mysql.user write;
  revoke all on *.* from 'mysqltest_1'@'localhost';
 unlock tables;
 drop user 'mysqltest_1'@'localhost';
+create database TESTDB;
+create table t2(a int);
+create temporary table t1 as select * from mysql.user;
+delete from mysql.user where host='localhost';
+INSERT INTO mysql.user VALUES
+('%','mysqltest_1',password('password'),'N','N','N','N','N','N',
+'N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N',
+'','','','',0,0,0,0);
+INSERT INTO mysql.db VALUES
+('%','TESTDB','mysqltest_1','Y','Y','Y','Y','Y','Y','N','Y','Y','Y','Y','N','Y','Y','Y','
+Y','N');
+Warnings:
+Warning	1265	Data truncated for column 'Alter_routine_priv' at row 1
+FLUSH PRIVILEGES;
+create database TEStdb;
+ERROR 42000: Access denied for user 'mysqltest_1'@'%' to database 'TEStdb'
+delete from mysql.user;
+delete from mysql.db where host='%' and user='mysqltest_1' and db='TESTDB';
+insert into mysql.user select * from t1;
+drop table t1, t2;
+drop database TESTDB;
+flush privileges;

mysql-test/t/grant2.test

@@ -429,3 +429,38 @@ disconnect con2root;
 disconnect con3root;
 
 # End of 4.1 tests
+
+#
+# Bug#17279 user with no global privs and with create
+#           priv in db can create databases
+#
+
+create database TESTDB;
+create table t2(a int);
+create temporary table t1 as select * from mysql.user;
+delete from mysql.user where host='localhost';
+INSERT INTO mysql.user VALUES
+('%','mysqltest_1',password('password'),'N','N','N','N','N','N',
+'N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N',
+'','','','',0,0,0,0);
+INSERT INTO mysql.db VALUES
+('%','TESTDB','mysqltest_1','Y','Y','Y','Y','Y','Y','N','Y','Y','Y','Y','N','Y','Y','Y','
+Y','N');
+FLUSH PRIVILEGES;
+
+connect (con1,localhost,mysqltest_1,password,TESTDB);
+
+# The user mysqltest_1 should only be allowed access to
+# database TESTDB, not TEStdb
+--error 1044
+create database TEStdb;
+
+# Clean-up
+connection default;
+delete from mysql.user;
+delete from mysql.db where host='%' and user='mysqltest_1' and db='TESTDB';
+insert into mysql.user select * from t1;
+drop table t1, t2;
+drop database TESTDB;
+flush privileges;
+

sql/sql_acl.cc

@@ -148,7 +148,9 @@ my_bool acl_init(bool dont_read_acl_tables)
 
   acl_cache= new hash_filo(ACL_CACHE_SIZE, 0, 0,
                            (hash_get_key) acl_entry_get_key,
-                           (hash_free_key) free, system_charset_info);
+                           (hash_free_key) free,
+                           /* Use the case sensitive "binary" charset */
+                           &my_charset_bin);
   if (dont_read_acl_tables)
   {
     DBUG_RETURN(0); /* purecov: tested */