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In OpenSSL there are two types of BIO's (I/O abstractions): source/sink and filters. A source/sink BIO is a source and/or sink of data, ie one acting on a socket or a file. A filter BIO takes a stream of input from another BIO and transforms it. In order for BIO_find_type() to be able to traverse the chain of BIO's and correctly find all BIO's of a certain type they shall have the type bit set accordingly, source/sink BIO's (what PostgreSQL implements) use BIO_TYPE_SOURCE_SINK and filter BIO's use BIO_TYPE_FILTER. In addition to these, file descriptor based BIO's should have the descriptor bit set, BIO_TYPE_DESCRIPTOR. The PostgreSQL implementation didn't set the type bits, which went unnoticed for a long time as it's only really relevant for code auditing the OpenSSL installation, or doing similar tasks. It is required by the API though, so this fixes it. Backpatch through 9.6 as this has been wrong for a long time. Author: Itamar Gafni Discussion: https://postgr.es/m/SN6PR06MB39665EC10C34BB20956AE4578AF39@SN6PR06MB3966.namprd06.prod.outlook.com Backpatch-through: 9.6
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/.