From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Unicode confusables and reordering characters considered harmful Date: Wed, 03 Nov 2021 11:43:49 -0400 Message-ID: References: <8b09eed8-36dd-61f5-2a8f-8525122df98c@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="16678"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: emacs-devel@gnu.org To: Reini Urban Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Nov 03 16:44:41 2021 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1miIRM-00049D-H3 for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Nov 2021 16:44:40 +0100 Original-Received: from localhost ([::1]:58174 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1miIRL-0005e8-7H for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Nov 2021 11:44:39 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:38244) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miIQh-0004ze-6G for emacs-devel@gnu.org; Wed, 03 Nov 2021 11:43:59 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:18804) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miIQe-0001sX-4h for emacs-devel@gnu.org; Wed, 03 Nov 2021 11:43:58 -0400 Original-Received: from pmg1.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg1.iro.umontreal.ca (Proxmox) with ESMTP id 21A021003B4; Wed, 3 Nov 2021 11:43:53 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg1.iro.umontreal.ca (Proxmox) with ESMTP id 90E0810018C; Wed, 3 Nov 2021 11:43:51 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1635954231; bh=scxMRkFn/sdyZn2VxQMwBA+V9j+kvxmF5IfgOJSPHkc=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=mqspWADHa9SOmHEYpaY3GN4bL+nvBwy71RXhT3BwjWtDu483/408AQ4zdM4j2SIcj wwetGIcNUf3LwEETXmSPSzFKauP8NvGJ5/PhHSGqae06GZUjES0tk6ZsArgM5WjpMH 3G/b2svUqCSDZyp6/fsObqDHFZg7sbGDLUxCnpMX0xgPbX4ZJbkfQpeLXmiGZUvqY4 eqT6iGtsEGHBvk7akPmlggUkHL9Hxft7qKSWqKKVDkHhd4afY8yaECN81ai+Ev2IdZ AW7QX11u/KRRtD/z6M9CsYXsmI7hjm+gIt0615Ryc4bN57GWguJ0GE4vtYqlg0GH2r Z3wLJQXEWdBng== Original-Received: from alfajor (lechon.iro.umontreal.ca [132.204.27.242]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 780BF1203A6; Wed, 3 Nov 2021 11:43:51 -0400 (EDT) In-Reply-To: (Reini Urban's message of "Wed, 3 Nov 2021 16:07:51 +0100") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:278586 Archived-At: > No, this summary is awful. > The issue is that libc, the C standard committee, linux and most others a= re > ignoring the unicode identifier security guidelines. > Identifiers must be identifiable, but strings should not be touched. What do those rules say about code like: int hi =3D 5; int =D7=A9=D6=B8=D7=81=D7=9C=D7=95=D6=B9=D7=9D =3D hi; int hello =3D 10; int =D8=A7=D9=84=D8=B3=D9=91=D9=84=D8=A7=D9=85=D8=B9=D9=84=D9=8A=D9=83 = =3D hello; myfun(=D7=A9=D6=B8=D7=81=D7=9C=D7=95=D6=B9=D7=9D ,=D8=A7=D9=84=D8=B3=D9= =91=D9=84=D8=A7=D9=85=D8=B9=D9=84=D9=8A=D9=83=D9=85) IMO this code is fundamentally valid: we should allow programmers to write identifiers in their native tongue. Does the security guidelines require override chars to force the `, ` to be in LTR, so as to fix the ordering problem (and would the result be more or less clear to someone familiar with those RTL scripts ;-0 )? Stefan