01eca6a913
The libpq code in charge of creating per-connection SSL objects was prone to a race condition when loading the custom BIO methods needed by my_SSL_set_fd(). As BIO methods are stored as a static variable, the initialization of a connection could fail because it could be possible to have one thread refer to my_bio_methods while it is being manipulated by a second concurrent thread. This error has been introduced by 8bb14cdd33de, that has removed ssl_config_mutex around the call of my_SSL_set_fd(), that itself sets the custom BIO methods used in libpq. Like previously, the BIO method initialization is now protected by the existing ssl_config_mutex, itself initialized earlier for WIN32. While on it, document that my_bio_methods is protected by ssl_config_mutex, as this can be easy to miss. Reported-by: Willi Mann Author: Willi Mann, Michael Paquier Discussion: https://postgr.es/m/e77abc4c-4d03-4058-a9d7-ef0035657e04@celonis.com Backpatch-through: 12
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. 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, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.