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The code copying the PGP block into the temp buffer failed to account for the extra 2 bytes in the buffer which are needed for the prefix. If the block was oversized, subsequent checks of the prefix would have exceeded the buffer size. Since the block sizes are hardcoded in the list of supported ciphers it can be verified that there is no live bug here. Backpatch all the way for consistency though, as this bug is old. Author: Mikhail Gribkov <youzhick@gmail.com> Discussion: https://postgr.es/m/CAMEv5_uWvcMCMdRFDsJLz2Q8g16HEa9xWyfrkr+FYMMFJhawOw@mail.gmail.com Backpatch-through: v12
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. Copyright and license information can be found in the file COPYRIGHT. General documentation about this version of PostgreSQL can be found at: https://www.postgresql.org/docs/devel/ In particular, information about building PostgreSQL from the source code can be found at: https://www.postgresql.org/docs/devel/installation.html 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/.