From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4BD28C433F5 for ; Wed, 20 Oct 2021 08:12:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 20E2E610CB for ; Wed, 20 Oct 2021 08:12:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229702AbhJTIO2 (ORCPT ); Wed, 20 Oct 2021 04:14:28 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:51111 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229603AbhJTIO1 (ORCPT ); Wed, 20 Oct 2021 04:14:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1634717530; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Li9UlQA1J3i950jpL0BPtiFiYfDF0JojypB7MTefSsU=; b=QJHgrl7g4MkfKBaG5KS5YL6OLaeGaMxkrZ03bjHtENpOI5bdqXOL9aJ9FTpLu0j94lv3KR XzjEz6/FebJrJVlMNIMcXxrzT+W2xKpuNBCkfGQJs3J8wfkzPO0gduytshgUElxKj+PCLQ wG0omdyE22e9p5lMHfOp+i7FZgXZ4qI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-103-bgu4EDreOM2TOtCqqKwY9A-1; Wed, 20 Oct 2021 04:12:06 -0400 X-MC-Unique: bgu4EDreOM2TOtCqqKwY9A-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9F4C418D6A2E; Wed, 20 Oct 2021 08:12:05 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.194.104]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3797960BF1; Wed, 20 Oct 2021 08:12:04 +0000 (UTC) From: Florian Weimer To: "Thaddeus H. Black" Cc: linux-man@vger.kernel.org, Alejandro Colomar , "G. Branden Robinson" , Michael Kerrisk Subject: Re: [PATCH v3] filename.7: new manual page References: <87fssxgzt8.fsf@oldenburg.str.redhat.com> Date: Wed, 20 Oct 2021 10:12:02 +0200 In-Reply-To: (Thaddeus H. Black's message of "Tue, 19 Oct 2021 11:05:22 +0000") Message-ID: <87lf2oxgh9.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org * Thaddeus H. Black: >> What does this mean? I think only byte 0x2f is reserved. The UTF-8 >> comment is misleading. A historic/overlong encoding of / in multiple >> UTF-8 bytes is *not* reserved. > > I had not known that UTF-8 had an alternate encoding for any ASCII > character. Does it indeed have an alternate encoding? If so, where > can I learn more? See the Security Considerations section in the RFC: Most file systems do not treat file names as UTF-8, so they do not perform any validation. Thanks, Florian