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Fix cache lookup hazards introduced by ff9618e82a.

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ff9618e82a introduced has_partition_ancestor_privs(), which is used
to check whether a user has MAINTAIN on any partition ancestors.
This involves syscache lookups, and presently this function does
not take any relation locks, so it is likely subject to the same
kind of cache lookup failures that were fixed by 19de0ab23c.

To fix this problem, this commit partially reverts ff9618e82a.
Specifically, it removes the partition-related changes, including
the has_partition_ancestor_privs() function mentioned above.  This
means that MAINTAIN on a partitioned table is no longer sufficient
to perform maintenance commands on its partitions.  This is more
like how privileges for maintenance commands work on supported
versions.  Privileges are checked for each partition, so a command
that flows down to all partitions might refuse to process them
(e.g., if the current user doesn't have MAINTAIN on the partition).

In passing, adjust a few related comments and error messages, and
add a test for the privilege checks for CLUSTER on a partitioned
table.

Reviewed-by: Michael Paquier, Jeff Davis
Discussion: https://postgr.es/m/20230613211246.GA219055%40nathanxps13
This commit is contained in:
Nathan Bossart
2023-06-22 15:48:20 -07:00
parent f5c446e336
commit 4dbdb82513
18 changed files with 74 additions and 105 deletions
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10
src/backend/commands/vacuum.c
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@@ -41,7 +41,6 @@
#include "catalog/pg_namespace.h"
#include "commands/cluster.h"
#include "commands/defrem.h"
#include "commands/tablecmds.h"
#include "commands/vacuum.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
@@ -721,17 +720,12 @@ vacuum_is_permitted_for_relation(Oid relid, Form_pg_class reltuple,
/*----------
* A role has privileges to vacuum or analyze the relation if any of the
* following are true:
* - the role is a superuser
* - the role owns the relation
* - the role owns the current database and the relation is not shared
* - the role has been granted the MAINTAIN privilege on the relation
* - the role has privileges to vacuum/analyze any of the relation's
* partition ancestors
* - the role has the MAINTAIN privilege on the relation
*----------
*/
if ((object_ownercheck(DatabaseRelationId, MyDatabaseId, GetUserId()) && !reltuple->relisshared) ||
pg_class_aclcheck(relid, GetUserId(), ACL_MAINTAIN) == ACLCHECK_OK ||
has_partition_ancestor_privs(relid, GetUserId(), ACL_MAINTAIN))
pg_class_aclcheck(relid, GetUserId(), ACL_MAINTAIN) == ACLCHECK_OK)
return true;
relname = NameStr(reltuple->relname);