7b4bfc87d5
The pg_stats view is supposed to be restricted to only show rows about tables the user can read. However, it sometimes can leak information which could not otherwise be seen when row level security is enabled. Fix that by not showing pg_stats rows to users that would be subject to RLS on the table the row is related to. This is done by creating/using the newly introduced SQL visible function, row_security_active(). Along the way, clean up three call sites of check_enable_rls(). The second argument of that function should only be specified as other than InvalidOid when we are checking as a different user than the current one, as in when querying through a view. These sites were passing GetUserId() instead of InvalidOid, which can cause the function to return incorrect results if the current user has the BYPASSRLS privilege and row_security has been set to OFF. Additionally fix a bug causing RI Trigger error messages to unintentionally leak information when RLS is enabled, and other minor cleanup and improvements. Also add WITH (security_barrier) to the definition of pg_stats. Bumped CATVERSION due to new SQL functions and pg_stats view definition. Back-patch to 9.5 where RLS was introduced. Reported by Yaroslav. Patch by Joe Conway and Dean Rasheed with review and input by Michael Paquier and Stephen Frost. |
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README
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.