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The change from MDEV-29465 exposed a flaw in replace_column_table
where again we were not properly updating the column-level bits.
replace_table_table was changed in MDEV-29465 to properly update
grant_table->init_cols, however replace_column_table still only
modified grant_column->rights when the GRANT_COLUMN already existed.
This lead to a missmatch between GRANT_COLUMN::init_rights and
GRANT_COLUMN::rights, *if* the GRANT_COLUMN already existed.
As an example:
GRANT SELECT (col1) ...
Here:
For col1
GRANT_COLUMN::init_rights and GRANT_COLUMN::rights are set to 1 (SELECT) in
replace_column_table.
GRANT INSERT (col1) ...
Here, without this patch GRANT_COLUMN::init_rights is still 1 and
GRANT_COLUMN::rights is 3 (SELECT_PRIV | INSERT_PRIV)
Finally, if before this patch, one does:
REVOKE SELECT (col1) ...
replace_table_table will see that init_rights loses bit 1 thus it
considers there are no more rights granted on that particular table.
This prompts the whole GRANT_TABLE to be removed via the first revoke,
when the GRANT_COLUMN corresponding to it should still have init_rights == 2.
By also updating replace_column_table to keep init_rights in sync
properly, the issue is resolved.
Reviewed by <serg@mariadb.com>
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=========== Problem =============
- `show columns` is not working for temporary tables, even though there
is enough privilege `create temporary tables`.
=========== Solution =============
- Append `TMP_TABLE_ACLS` privilege when running `show columns` for temp
tables.
- Additionally `check_access()` for database only once, not for each
field
=========== Additionally =============
- Update comments for function `check_table_access` arguments
Reviewed by: <vicentiu@mariadb.org>
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- Added missing information about database of corresponding table for various types of commands
- Update some typos
- Reviewed by: <vicentiu@mariadb.org>
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- Proceed with commit fafb35ee517f309d9e507f6e3908caca5d8cd257
Reviewed by: serg@mariadb.com
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Quotes added to output.
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