X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Date: Fri, 28 Aug 2009 20:37:54 +0200 From: Corinna Vinschen To: cygwin@cygwin.com Subject: Re: [1.7] Admins can write to readonly files Message-ID: <20090828183754.GB27217@calimero.vinschen.de> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <1MgyLg-0CvIW00@fwd04.aul.t-online.de> <4A97B5DB.6010008@gmail.com> <4A981A80.2080006@t-online.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A981A80.2080006@t-online.de> User-Agent: Mutt/1.5.19 (2009-02-20) Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On Aug 28 19:57, Christian Franke wrote: > Dave Korn wrote: >> Christian Franke wrote: >> >>> For members of Admin group, Cygwin 1.7 allows to overwrite files without >>> write permission, but Cygwin 1.5 does not. >>> >> >> You are the root user, this is Unix. Of course you can overwrite files >> without write permission. >> >> > > This is not true when 'chmod -w ...' was done before the upgrade to 1.7. > Cygwin 1.5 sets R/O attribute, then open for write fails with permission > denied also on 1.7. That's why 1.7 tries not to set the R/O DOS attribute anymore. But yes, that's not quite consistent. open(2) should open these files for writing as well. Unfortunately this requires to remove the R/O attribute before trying to open the file for writing. There's no atomic way to accomplish this. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple