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  1. MariaDB Server
  2. MDEV-28544

Appending SELECT privilege not applied on show columns and show index

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      Description

      When the user is created without SELECT privilege and after that applied the SELECT privilege nothing changes:

      create database db;
      create user foo@localhost;
      grant create on db.* to foo@localhost;
       
      --connect (con1,localhost,foo,,db)
      create table t (a int, key(a));
      show create table t;
      --error ER_TABLEACCESS_DENIED_ERROR
      show columns in t;
      --error ER_TABLEACCESS_DENIED_ERROR
      show index in t;
       
      # Give the user select privilege
      --connection default
      grant select on db.* to foo@localhost;
       
      --connection con1
      show grants for current_user;
      Grants for foo@localhost
      GRANT USAGE ON *.* TO `foo`@`localhost`
      GRANT SELECT, CREATE ON `db`.* TO `foo`@`localhost`
       
      # This should be visible but is not - bug! still ER_TABLEACCESS_DENIED_ERROR
      show columns in t;
      8: query 'show columns in t' failed: ER_TABLEACCESS_DENIED_ERROR (1142): SELECT command denied to user 'foo'@'localhost' for table 't'
       
      # This should be visible but is not - bug! still ER_TABLEACCESS_DENIED_ERROR
      show index in t;
       
      # Cleanup
      --disconnect con1
      --connection default
      drop database db;
      drop user foo@localhost;
      

      However if we create new user that has just SELECT priv it works

      --connection default
      create user bar@localhost;
      grant select on db.* to bar@localhost;
      show grants for bar@localhost;
      Grants for bar@localhost
      GRANT USAGE ON *.* TO `bar`@`localhost`
      GRANT SELECT ON `db`.* TO `bar`@`localhost`
       
      --connect (con2,localhost,bar,,db)
      show index in t;
      Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	CardinalitySub_part	Packed	Null	Index_type	Comment	Index_comment	Ignored
      t	1	a	1	a	A	NULL	NULL	NULL	YES	BTREE			NO
      show columns in t;
      Field	Type	Null	Key	Default	Extra
      a	int(11)	YES	MUL	NULL	
      

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              Assignee:
              anel Anel Husakovic
              Reporter:
              anel Anel Husakovic
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                Updated:
                Resolved:

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