From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL autolearn=ham autolearn_force=no version=3.4.2 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by inbox.vuxu.org (OpenSMTPD) with SMTP id a8b277c6 for ; Wed, 22 Jan 2020 20:48:37 +0000 (UTC) Received: (qmail 9226 invoked by uid 550); 22 Jan 2020 20:48:36 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Reply-To: musl@lists.openwall.com Received: (qmail 8184 invoked from network); 22 Jan 2020 20:48:36 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579726104; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=r6QXS3pEgJQKibNLyQjvdVkXPG74wJboBJopRAUSjv0=; b=eUKfX3thUBwIJgKx0w8fBQBla7EeCV/bWn1SDGl+gyuj2PX3TxvWzEwo+qBrP3n06KF8BS Xs0g8HBoBn3MpmkSOEMBVJM3b73M1vhnxyGOtQoU0xKHvc3Wgv6RJYsgjxXBxt+17cgZQZ 3yyHttJWQA2D6XlAqBjY0dQLsp6FiEI= From: Florian Weimer To: Rich Felker Cc: 39236@debbugs.gnu.org, musl@lists.openwall.com References: <20200122141557.GA8157@brightrain.aerifal.cx> <87ftg7k1at.fsf@oldenburg2.str.redhat.com> <20200122144243.GZ30412@brightrain.aerifal.cx> <87a76fjzpx.fsf@oldenburg2.str.redhat.com> <20200122151507.GB30412@brightrain.aerifal.cx> <87zhefik0y.fsf@oldenburg2.str.redhat.com> <20200122160743.GC30412@brightrain.aerifal.cx> <87v9p3ihvq.fsf@oldenburg2.str.redhat.com> <20200122171508.GD30412@brightrain.aerifal.cx> Date: Wed, 22 Jan 2020 21:48:14 +0100 In-Reply-To: <20200122171508.GD30412@brightrain.aerifal.cx> (Rich Felker's message of "Wed, 22 Jan 2020 12:15:08 -0500") Message-ID: <87zheffca9.fsf@oldenburg2.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: ltK9dAjQObmVb1vSVETkrQ-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Subject: Re: [musl] coreutils cp mishandles error return from lchmod * Rich Felker: >> Hmm. The way I read the musl code, the O_PATH descriptor already >> exists. At this point, you can just chmod the O_PATH descriptor, and >> have the kernel report EOPNOTSUPP if the file system does not support >> that. > > Oh, you mean the second one after it's already open? Maybe that's ok. Yes, that's what I meant. > I was concerned it might follow the link and chmod the target at that > point. In my tests, it works. I think it's also documented behavior for chown on these pseudo-files. I also verified that closing an O_PATH descriptor does not release POSIX advisory locks for the same file. But I'm wondering if there's still something we are missing. Thanks, Florian