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Commit508bf95

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Remove any-user DML capability from allow_system_table_mods
Previously, allow_system_table_mods allowed a non-superuser to do DMLon a system table without further permission checks. This has beenremoved, as it was quite inconsistent with the rest of the meaning ofthis setting. (Since allow_system_table_mods was previously onlyaccessible with a server restart, it is unlikely that anyone was usingthis possibility.)Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>Discussion:https://www.postgresql.org/message-id/flat/8b00ea5e-28a7-88ba-e848-21528b632354%402ndquadrant.com
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‎src/backend/catalog/aclchk.c

Lines changed: 2 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -3851,7 +3851,7 @@ pg_class_aclmask(Oid table_oid, Oid roleid,
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/*
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* Deny anyone permission to update a system catalog unless
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* pg_authid.rolsuper is set. Also allow it if allowSystemTableMods.
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* pg_authid.rolsuper is set.
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*
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* As of 7.4 we have some updatable system views; those shouldn't be
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* protected in this way. Assume the view rules can take care of
@@ -3860,8 +3860,7 @@ pg_class_aclmask(Oid table_oid, Oid roleid,
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if ((mask& (ACL_INSERT |ACL_UPDATE |ACL_DELETE |ACL_TRUNCATE |ACL_USAGE))&&
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IsSystemClass(table_oid,classForm)&&
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classForm->relkind!=RELKIND_VIEW&&
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!superuser_arg(roleid)&&
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!allowSystemTableMods)
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!superuser_arg(roleid))
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{
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#ifdefACLDEBUG
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elog(DEBUG2,"permission denied for system catalog update");

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