Merge Bug#7391 from 4.0

mysql-test/r/update.result:
  Auto merged
mysql-test/t/update.test:
  Auto merged
sql/sql_select.cc:
  Auto merged
mysql-test/mysql-test-run.sh:
  Merge from 4.0

mysql-test/mysql-test-run.sh

@@ -4,6 +4,7 @@
 # Slightly updated by Monty
 # Cleaned up again by Matt
 # Fixed by Sergei
+# List of failed cases (--force) backported from 4.1 by Joerg
 # :-)
 
 #++

mysql-test/r/grant.result

@@ -341,3 +341,67 @@ select Host,Db,User,Table_name,Column_name,Column_priv from mysql.columns_priv;
 Host	Db	User	Table_name	Column_name	Column_priv
 drop user grant_user@localhost;
 drop table t1;
+create database mysqltest_1;
+create database mysqltest_2;
+create table mysqltest_1.t1 select 1 a, 2 q;
+create table mysqltest_1.t2 select 1 b, 2 r;
+create table mysqltest_2.t1 select 1 c, 2 s;
+create table mysqltest_2.t2 select 1 d, 2 t;
+grant update (a) on mysqltest_1.t1 to mysqltest_3@localhost;
+grant select (b) on mysqltest_1.t2 to mysqltest_3@localhost;
+grant select (c) on mysqltest_2.t1 to mysqltest_3@localhost;
+grant update (d) on mysqltest_2.t2 to mysqltest_3@localhost;
+show grants for mysqltest_3@localhost;
+Grants for mysqltest_3@localhost
+GRANT USAGE ON *.* TO 'mysqltest_3'@'localhost'
+GRANT SELECT (b) ON `mysqltest_1`.`t2` TO 'mysqltest_3'@'localhost'
+GRANT SELECT (c) ON `mysqltest_2`.`t1` TO 'mysqltest_3'@'localhost'
+GRANT UPDATE (a) ON `mysqltest_1`.`t1` TO 'mysqltest_3'@'localhost'
+GRANT UPDATE (d) ON `mysqltest_2`.`t2` TO 'mysqltest_3'@'localhost'
+update mysqltest_1.t1, mysqltest_1.t2 set q=10 where b=1;
+ERROR 42000: UPDATE command denied to user 'mysqltest_3@localhost' for column 'q' in table 't1'
+update mysqltest_1.t1, mysqltest_2.t2 set d=20 where d=1;
+ERROR 42000: SELECT command denied to user 'mysqltest_3@localhost' for column 'd' in table 't1'
+update mysqltest_2.t1, mysqltest_1.t2 set c=20 where b=1;
+ERROR 42000: UPDATE command denied to user 'mysqltest_3@localhost' for column 'c' in table 't1'
+update mysqltest_2.t1, mysqltest_2.t2 set d=10 where s=2;
+ERROR 42000: SELECT command denied to user 'mysqltest_3@localhost' for column 's' in table 't1'
+update mysqltest_1.t1, mysqltest_2.t2 set a=10,d=10;
+update mysqltest_1.t1, mysqltest_2.t1 set a=20 where c=20;
+select t1.*,t2.* from mysqltest_1.t1,mysqltest_1.t2;
+a	q	b	r
+10	2	1	2
+select t1.*,t2.* from mysqltest_2.t1,mysqltest_2.t2;
+c	s	d	t
+1	2	10	2
+revoke all on mysqltest_1.t1 from mysqltest_3@localhost;
+revoke all on mysqltest_1.t2 from mysqltest_3@localhost;
+revoke all on mysqltest_2.t1 from mysqltest_3@localhost;
+revoke all on mysqltest_2.t2 from mysqltest_3@localhost;
+grant all on mysqltest_2.* to mysqltest_3@localhost;
+grant select on *.* to mysqltest_3@localhost;
+flush privileges;
+use mysqltest_1;
+update mysqltest_2.t1, mysqltest_2.t2 set c=500,d=600;
+update mysqltest_1.t1, mysqltest_1.t2 set a=100,b=200;
+ERROR 42000: UPDATE command denied to user 'mysqltest_3@localhost' for column 'a' in table 't1'
+use mysqltest_2;
+update mysqltest_1.t1, mysqltest_1.t2 set a=100,b=200;
+ERROR 42000: Access denied for user 'mysqltest_3@localhost' to database 'mysqltest_1'
+update mysqltest_2.t1, mysqltest_1.t2 set c=100,b=200;
+ERROR 42000: Access denied for user 'mysqltest_3@localhost' to database 'mysqltest_1'
+update mysqltest_1.t1, mysqltest_2.t2 set a=100,d=200;
+ERROR 42000: Access denied for user 'mysqltest_3@localhost' to database 'mysqltest_1'
+select t1.*,t2.* from mysqltest_1.t1,mysqltest_1.t2;
+a	q	b	r
+10	2	1	2
+select t1.*,t2.* from mysqltest_2.t1,mysqltest_2.t2;
+c	s	d	t
+500	2	600	2
+delete from mysql.user where user='mysqltest_3';
+delete from mysql.db where user="mysqltest_3";
+delete from mysql.tables_priv where user="mysqltest_3";
+delete from mysql.columns_priv where user="mysqltest_3";
+flush privileges;
+drop database mysqltest_1;
+drop database mysqltest_2;

mysql-test/t/grant.test

@@ -5,6 +5,8 @@
 drop table if exists t1;
 --enable_warnings
 
+connect (master,localhost,root,,);
+connection master;
 SET NAMES binary;
 
 #
@@ -280,3 +282,73 @@ show grants for grant_user@localhost;
 select Host,Db,User,Table_name,Column_name,Column_priv from mysql.columns_priv;
 drop user grant_user@localhost;
 drop table t1;
+
+#
+# Bug#7391: Cross-database multi-table UPDATE security problem
+#
+create database mysqltest_1;
+create database mysqltest_2;
+create table mysqltest_1.t1 select 1 a, 2 q;
+create table mysqltest_1.t2 select 1 b, 2 r;
+create table mysqltest_2.t1 select 1 c, 2 s;
+create table mysqltest_2.t2 select 1 d, 2 t;
+
+#test the column privileges
+grant update (a) on mysqltest_1.t1 to mysqltest_3@localhost;
+grant select (b) on mysqltest_1.t2 to mysqltest_3@localhost;
+grant select (c) on mysqltest_2.t1 to mysqltest_3@localhost;
+grant update (d) on mysqltest_2.t2 to mysqltest_3@localhost;
+connect (conn1,localhost,mysqltest_3,,);
+connection conn1;
+show grants for mysqltest_3@localhost;
+--error 1143
+update mysqltest_1.t1, mysqltest_1.t2 set q=10 where b=1;
+--error 1143
+update mysqltest_1.t1, mysqltest_2.t2 set d=20 where d=1;
+--error 1143
+update mysqltest_2.t1, mysqltest_1.t2 set c=20 where b=1;
+--error 1143
+update mysqltest_2.t1, mysqltest_2.t2 set d=10 where s=2;
+#the following two should work
+update mysqltest_1.t1, mysqltest_2.t2 set a=10,d=10;
+update mysqltest_1.t1, mysqltest_2.t1 set a=20 where c=20;
+connection master;
+select t1.*,t2.* from mysqltest_1.t1,mysqltest_1.t2;
+select t1.*,t2.* from mysqltest_2.t1,mysqltest_2.t2;
+revoke all on mysqltest_1.t1 from mysqltest_3@localhost;
+revoke all on mysqltest_1.t2 from mysqltest_3@localhost;
+revoke all on mysqltest_2.t1 from mysqltest_3@localhost;
+revoke all on mysqltest_2.t2 from mysqltest_3@localhost;
+
+#test the db/table level privileges
+grant all on mysqltest_2.* to mysqltest_3@localhost;
+grant select on *.* to mysqltest_3@localhost;
+flush privileges;
+disconnect conn1;
+connect (conn2,localhost,mysqltest_3,,);
+connection conn2;
+use mysqltest_1;
+update mysqltest_2.t1, mysqltest_2.t2 set c=500,d=600;
+# the following failed before, should fail now.
+--error 1143
+update mysqltest_1.t1, mysqltest_1.t2 set a=100,b=200;
+use mysqltest_2;
+#the following used to succeed, it must fail now.
+--error 1044
+update mysqltest_1.t1, mysqltest_1.t2 set a=100,b=200;
+--error 1044
+update mysqltest_2.t1, mysqltest_1.t2 set c=100,b=200;
+--error 1044
+update mysqltest_1.t1, mysqltest_2.t2 set a=100,d=200;
+#lets see the result
+connection master;
+select t1.*,t2.* from mysqltest_1.t1,mysqltest_1.t2;
+select t1.*,t2.* from mysqltest_2.t1,mysqltest_2.t2;
+
+delete from mysql.user where user='mysqltest_3';
+delete from mysql.db where user="mysqltest_3";
+delete from mysql.tables_priv where user="mysqltest_3";
+delete from mysql.columns_priv where user="mysqltest_3";
+flush privileges;
+drop database mysqltest_1;
+drop database mysqltest_2;

sql/sql_select.cc

@@ -6005,10 +6005,7 @@ join_read_system(JOIN_TAB *tab)
     {
       if (error != HA_ERR_END_OF_FILE)
 	return report_error(table, error);
-      if (tab->on_expr)
       mark_as_null_row(tab->table);
-      else
-        table->null_row=1;			// Why do this for inner join?
       empty_record(table);			// Make empty record
       return -1;
     }
@@ -6038,10 +6035,7 @@ join_read_const(JOIN_TAB *tab)
     }
     if (error)
     {
-      if (tab->on_expr)
       mark_as_null_row(tab->table);
-      else
-        table->null_row=1;
       empty_record(table);
       if (error != HA_ERR_KEY_NOT_FOUND)
 	return report_error(table, error);

sql/sql_update.cc

@@ -553,7 +553,9 @@ int mysql_multi_update(THD *thd,
     */
     for (tl= update_list; tl; tl= tl->next)
     {
+      TABLE_LIST *save= tl->next;
       TABLE *table= tl->table;
+      uint wants;
       /* if table will be updated then check that it is unique */
       if (table->map & update_tables)
       {
@@ -571,17 +573,31 @@ int mysql_multi_update(THD *thd,
 	DBUG_PRINT("info",("setting table `%s` for update", tl->alias));
 	tl->lock_type= thd->lex->multi_lock_option;
 	tl->updating= 1;
+	wants= UPDATE_ACL;
       }
       else
       {
         DBUG_PRINT("info",("setting table `%s` for read-only", tl->alias));
 	tl->lock_type= TL_READ;
 	tl->updating= 0;
+	wants= SELECT_ACL;
       }
+
       if (tl->derived)
         derived_tables|= table->map;
-      else if (!using_lock_tables)
+      else 
+      {
+        tl->next= 0;
+        if (!using_lock_tables)
 	  tl->table->reginfo.lock_type= tl->lock_type;
+        if (check_access(thd, wants, tl->db, &tl->grant.privilege, 0, 0) ||
+            (grant_option && check_grant(thd, wants, tl, 0, 0, 0)))
+        {
+          tl->next= save;
+          DBUG_RETURN(0);
+        }
+        tl->next= save;
+      }
     }
 
     if (thd->lex->derived_tables && (update_tables & derived_tables))