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We need to tell fmtId() what encoding to assume, but this function doesn't know that. Fortunately we can fix that without changing the function's API, because we can just use SQL_ASCII. That's because database names in connection requests are effectively binary not text: no encoding-aware processing will happen on them. This fixes XversionUpgrade failures seen in the buildfarm. The alternative of having pg_upgrade use setFmtEncoding() is unappetizing, given that it's connecting to multiple databases that may have different encodings. Andres Freund, Noah Misch, Tom Lane Security: CVE-2025-1094
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/.