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Michael Paquier a0b0136259 Avoid memory size overflow when allocating backend activity buffer 
The code in charge of copying the contents of PgBackendStatus to local
memory could fail on memory allocation because of an overflow on the
amount of memory to use.  The overflow can happen when combining a high
value track_activity_query_size (max at 1MB) with a large
max_connections, when both multiplied get higher than INT32_MAX as both
parameters treated as signed integers.  This could for example trigger
with the following functions, all calling pgstat_read_current_status():
- pg_stat_get_backend_subxact()
- pg_stat_get_backend_idset()
- pg_stat_get_progress_info()
- pg_stat_get_activity()
- pg_stat_get_db_numbackends()

The change to use MemoryContextAllocHuge() has been introduced in
8d0ddccec6, so backpatch down to 12.

Author: Jakub Wartak
Discussion: https://postgr.es/m/CAKZiRmw8QSNVw2qNK-dznsatQqz+9DkCquxP0GHbbv1jMkGHMA@mail.gmail.com
Backpatch-through: 12
2023-10-03 15:37:23 +09:00
config Use --strip-unneeded when stripping static libraries with GNU strip. 2023-04-20 18:12:32 -04:00
contrib unaccent: Tweak value of PYTHON when building without Python support 2023-09-27 14:41:26 +09:00
doc Doc: improve description of dump/restore's --clean and --if-exists. 2023-09-29 13:13:54 -04:00
src Avoid memory size overflow when allocating backend activity buffer 2023-10-03 15:37:23 +09:00
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configure Stamp 13.12. 2023-08-07 16:11:34 -04:00
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README 

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/.