Thomas Munro 9c7acc3330 Reject non-ASCII locale names. Commit `bf03cfd1` started scanning all available BCP 47 locale names on Windows. This caused an abort/crash in the Windows runtime library if the default locale name contained non-ASCII characters, because of our use of the setlocale() save/restore pattern with "char" strings. After switching to another locale with a different encoding, the saved name could no longer be understood, and setlocale() would abort. "Turkish_Türkiye.1254" is the example from recent reports, but there are other examples of countries and languages with non-ASCII characters in their names, and they appear in Windows' (old style) locale names. To defend against this: 1. In initdb, reject non-ASCII locale names given explicity on the command line, or returned by the operating system environment with setlocale(..., ""), or "canonicalized" by the operating system when we set it. 2. In initdb only, perform the save-and-restore with Windows' non-standard wchar_t variant of setlocale(), so that it is not subject to round trip failures stemming from char string encoding confusion. 3. In the backend, we don't have to worry about the save-and-restore problem because we have already vetted the defaults, so we just have to make sure that CREATE DATABASE also rejects non-ASCII names in any new databases. SET lc_XXX doesn't suffer from the problem, but the ban applies to it too because it uses check_locale(). CREATE COLLATION doesn't suffer from the problem either, but it doesn't use check_locale() so it is not included in the new ban for now, to minimize the change. Anyone who encounters the new error message should either create a new duplicated locale with an ASCII-only name using Windows Locale Builder, or consider using BCP 47 names like "tr-TR". Users already couldn't initialize a cluster with "Turkish_Türkiye.1254" on PostgreSQL 16+, but the new failure mode is an error message that explains why, instead of a crash. Back-patch to 16, where `bf03cfd1` landed. Older versions are affected in theory too, but only 16 and later are causing crash reports. Reviewed-by: Andrew Dunstan <andrew@dunslane.net> (the idea, not the patch) Reported-by: Haifang Wang (Centific Technologies Inc) <v-haiwang@microsoft.com> Discussion: https://postgr.es/m/PH8PR21MB3902F334A3174C54058F792CE5182%40PH8PR21MB3902.namprd21.prod.outlook.com		11 months ago
config	jit: Remove {llvm-config,clang}-N configure probes.	1 year ago
contrib	Add missing query ID reporting in extended query protocol	1 year ago
doc	doc: Clarify name of files generated by pg_waldump --save-fullpage	12 months ago
src	Reject non-ASCII locale names.	11 months ago
.cirrus.star	Remove duplicate words in docs and code comments.	2 years ago
.cirrus.tasks.yml	ci: Pin MacPorts version to 2.9.3.	1 year ago
.cirrus.yml	ci: Make compute resources for CI configurable	2 years ago
.dir-locals.el	Make Emacs perl-mode indent more like perltidy.	7 years ago
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.git-blame-ignore-revs	Add commit `7229ebe011` to .git-blame-ignore-revs.	1 year ago
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COPYRIGHT	Update copyright for 2024	2 years ago
GNUmakefile.in	Allow selecting the git revision to be packaged by "make dist".	1 year ago
HISTORY	Canonicalize some URLs	6 years ago
Makefile	Adapt REL_17_STABLE to its new status as a stable branch	1 year ago
README.md	Adapt REL_17_STABLE to its new status as a stable branch	1 year ago
aclocal.m4	autoconf: Move export_dynamic determination to configure	3 years ago
configure	Stamp 17.0.	12 months ago
configure.ac	Stamp 17.0.	12 months ago
meson.build	Stamp 17.0.	12 months ago
meson_options.txt	Allow selecting the git revision to be packaged by "make dist".	1 year ago

README.md

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.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/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/.