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A caller of TRUNCATE could previously queue for an access exclusive lock on a relation it may not have permission to truncate, potentially interfering with users authorized to work on it. This can be very intrusive depending on the lock attempted to be taken. For example, pg_authid could be blocked, preventing any authentication attempt to happen on a PostgreSQL instance. This commit fixes the case of TRUNCATE so as RangeVarGetRelidExtended is used with a callback doing the necessary ACL checks at an earlier stage, avoiding lock queuing issues, so as an immediate failure happens for unprivileged users instead of waiting on a lock that would not be taken. This is rather similar to the type of work done in cbe24a6 for CLUSTER, and the code of TRUNCATE is this time refactored so as there is no user-facing changes. As the commit for CLUSTER, no back-patch is done. Reported-by: Lloyd Albin, Jeremy Schneider Author: Michael Paquier Reviewed by: Nathan Bossart, Kyotaro Horiguchi Discussion: https://postgr.es/m/152512087100.19803.12733865831237526317@wrigleys.postgresql.org Discussion: https://postgr.es/m/20180806165816.GA19883@paquier.xyz
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.