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PgStat_HashKey is currently initialized in a way that could result in random data if the structure has any padding bytes. The structure has no padding bytes currently, fortunately, but it could become a problem should the structure change at some point in the future. The code is changed to use some memset(0) so as any padding would be handled properly, as it would be surprising to see random failures in the pgstats entry lookups. PgStat_HashKey is a structure internal to pgstats, and an ABI change could be possible in the scope of a bug fix, so backpatch down to 15 where this has been introduced. Author: Bertrand Drouvot Reviewed-by: Jelte Fennema-Nio, Michael Paquier Discussion: https://postgr.es/m/Zyb7RW1y9dVfO0UH@ip-10-97-1-34.eu-west-3.compute.internal Backpatch-through: 15 |
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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/.