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19a6545815
When enabling wal_compression, there is a risk to leak data similarly to the BREACH and CRIME attacks on SSL where the compression ratio of a full page image gives a hint of what is the existing data of this page. This vulnerability is quite cumbersome to exploit in practice, but doable. So this patch makes wal_compression PGC_SUSET in order to prevent non-superusers from enabling it and exploiting the vulnerability while DBA thinks the risk very seriously and disables it in postgresql.conf. Back-patch to 9.5 where wal_compression was introduced.
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/.