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pg_stat_get_subscription scanned one more LogicalRepWorker array entry than is really allocated. In the worst case this could lead to SIGSEGV, if the LogicalRepCtx data structure is near the end of shared memory. That seems quite unlikely though (thanks to the ordering of calls in CreateSharedMemoryAndSemaphores) and we've heard no field reports of it. A more likely misbehavior is one row of garbage data in the function's result, but even that is not real likely because of the check that the pid field matches some live backend. Report and fix by Kuntal Ghosh. This bug is old, so back-patch to all supported branches. Discussion: https://postgr.es/m/CAGz5QCJykEDzW6jQK6Yz7Qh_PMtD=95de_7QoocbVR2Qy8hWZA@mail.gmail.com |
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README.git |
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/.