Merge svojtovich@bk-internal.mysql.com:/home/bk/mysql-4.0

into  mysql.com:/home/svoj/devel/mysql/BUG32111/mysql-4.0

mysql-test/r/symlink.result

@@ -84,3 +84,9 @@ t1	CREATE TABLE `t1` (
   `b` int(11) default NULL
 ) TYPE=MyISAM
 drop table t1;
+CREATE TABLE t1(a INT)
+DATA DIRECTORY='TEST_DIR/var/master-data/mysql'
+INDEX DIRECTORY='TEST_DIR/var/master-data/mysql';
+RENAME TABLE t1 TO user;
+Can't create/write to file 'TEST_DIR/var/master-data/mysql/user.MYI' (Errcode: 17)
+DROP TABLE t1;

mysql-test/t/symlink.test

@@ -112,3 +112,15 @@ eval alter table t1 index directory="$MYSQL_TEST_DIR/var/log";
 enable_query_log;
 show create table t1;
 drop table t1;
+
+#
+# BUG#32111 - Security Breach via DATA/INDEX DIRECORY and RENAME TABLE
+#
+--replace_result $MYSQL_TEST_DIR TEST_DIR
+eval CREATE TABLE t1(a INT)
+DATA DIRECTORY='$MYSQL_TEST_DIR/var/master-data/mysql'
+INDEX DIRECTORY='$MYSQL_TEST_DIR/var/master-data/mysql';
+--replace_result $MYSQL_TEST_DIR TEST_DIR
+--error 1
+RENAME TABLE t1 TO user;
+DROP TABLE t1;

mysys/my_symlink2.c

@@ -120,6 +120,7 @@ int my_rename_with_symlink(const char *from, const char *to, myf MyFlags)
   int was_symlink= (!my_disable_symlinks &&
 		    !my_readlink(link_name, from, MYF(0)));
   int result=0;
+  int name_is_different;
   DBUG_ENTER("my_rename_with_symlink");
 
   if (!was_symlink)
@@ -128,6 +129,14 @@ int my_rename_with_symlink(const char *from, const char *to, myf MyFlags)
   /* Change filename that symlink pointed to */
   strmov(tmp_name, to);
   fn_same(tmp_name,link_name,1);		/* Copy dir */
+  name_is_different= strcmp(link_name, tmp_name);
+  if (name_is_different && !access(tmp_name, F_OK))
+  {
+    my_errno= EEXIST;
+    if (MyFlags & MY_WME)
+      my_error(EE_CANTCREATEFILE, MYF(0), tmp_name, EEXIST);
+    DBUG_RETURN(1);
+  }
 
   /* Create new symlink */
   if (my_symlink(tmp_name, to, MyFlags))
@@ -139,7 +148,7 @@ int my_rename_with_symlink(const char *from, const char *to, myf MyFlags)
     the same basename and different directories.
    */
 
-  if (strcmp(link_name, tmp_name) && my_rename(link_name, tmp_name, MyFlags))
+  if (name_is_different && my_rename(link_name, tmp_name, MyFlags))
   {
     int save_errno=my_errno;
     my_delete(to, MyFlags);			/* Remove created symlink */