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Thomas Munro cd7f19da34 Fix potential pointer overflow in xlogreader.c.
While checking if a record could fit in the circular WAL decoding
buffer, the coding from commit 3f1ce973 used arithmetic that could
overflow.  64 bit systems were unaffected for various technical reasons,
which probably explains the lack of problem reports.  Likewise for 32
bit systems running known 32 bit kernels.  The systems at risk of
problems appear to be 32 bit processes running on 64 bit kernels, with
unlucky placement in memory.

Per complaint from GCC -fsanitize=undefined -m32, while testing
variations of 039_end_of_wal.pl.

Back-patch to 15.

Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Discussion: https://postgr.es/m/CA%2BhUKGKH0oRPOX7DhiQ_b51sM8HqcPp2J3WA-Oen%3DdXog%2BAGGQ%40mail.gmail.com
2023-12-08 16:09:03 +13:00
config Remove distprep 2023-11-06 15:18:04 +01:00
contrib Add support for deparsing semi-joins to contrib/postgres_fdw 2023-12-05 22:53:12 +02:00
doc doc: clarify handling of ON CONFLICT with triggers 2023-12-07 21:35:50 -05:00
src Fix potential pointer overflow in xlogreader.c. 2023-12-08 16:09:03 +13:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml Use "template" data directory in tests 2023-08-24 14:38:02 -07:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
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.editorconfig
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aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Optimize pg_readv/pg_pwritev single vector case. 2023-11-29 17:19:25 +13:00
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HISTORY
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
meson_options.txt meson: Change default of 'selinux' feature option to auto 2023-11-17 10:23:02 -08:00
meson.build meson: Stop using deprecated way getting path of files 2023-11-30 19:25:40 -08:00
README README: remove duplicate download link & mention related softw. 2023-11-08 16:36:18 -05:00
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.

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, 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/.