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Thomas Munro adbb27ac89 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
2024-10-05 13:50:02 +13:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Simplify checking for xlocale.h 2024-10-01 07:23:45 -04:00
contrib file_fdw: Add on_error and log_verbosity options to file_fdw. 2024-10-03 15:57:32 +09:00
doc file_fdw: Add on_error and log_verbosity options to file_fdw. 2024-10-03 15:57:32 +09:00
src Reject non-ASCII locale names. 2024-10-05 13:50:02 +13:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml Add PG_TEST_PG_COMBINEBACKUP_MODE to CI tasks 2024-09-10 16:30:38 +02:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add commit 7229ebe011 to .git-blame-ignore-revs. 2024-09-14 20:17:30 +02:00
.gitattributes Remove non-existing file from .gitattributes 2024-02-16 11:39:09 +01:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Simplify checking for xlocale.h 2024-10-01 07:23:45 -04:00
configure.ac Simplify checking for xlocale.h 2024-10-01 07:23:45 -04:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build Simplify checking for xlocale.h 2024-10-01 07:23:45 -04:00
meson_options.txt Remove spinlocks and atomics from meson_options.txt. 2024-07-30 23:37:14 +12:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

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.

Copyright and license information can be found in the file COPYRIGHT.

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