From mboxrd@z Thu Jan 1 00:00:00 1970 From: Al Viro Subject: Re: [PATCH] utimensat() non-conformances and fixes [v3] Date: Tue, 3 Jun 2008 13:08:50 +0100 Message-ID: <20080603120850.GZ28946@ZenIV.linux.org.uk> References: <48401E7E.9090304@gmail.com> <20080603112221.GW28946@ZenIV.linux.org.uk> <20080603113018.GA27955@shareable.org> <20080603114921.GX28946@ZenIV.linux.org.uk> <20080603120135.GA28905@shareable.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20080603120135.GA28905-yetKDKU6eevNLxjTenLetw@public.gmane.org> Sender: linux-man-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jamie Lokier Cc: Michael Kerrisk , Miklos Szeredi , drepper-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-man@vger.kernel.org On Tue, Jun 03, 2008 at 01:01:35PM +0100, Jamie Lokier wrote: > > with a lot of things, starting with "why utimes(2) has weaker requirements > > with NULL argument", but we are far too late to fix that. > > To be fair, having a writable file descriptor only lets you change the > mtime to "now", and having a readable file descriptor only lets you > change the atime to "now". > > Changing the times _in general_ can be seen as over-reaching those > capabilities and arguably justifies more strict checks. Which is what all questions about writability apply only to NULL case anyway... -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758101AbYFCMJU (ORCPT ); Tue, 3 Jun 2008 08:09:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751094AbYFCMJE (ORCPT ); Tue, 3 Jun 2008 08:09:04 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:52601 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756072AbYFCMJD (ORCPT ); Tue, 3 Jun 2008 08:09:03 -0400 Date: Tue, 3 Jun 2008 13:08:50 +0100 From: Al Viro To: Jamie Lokier Cc: Michael Kerrisk , Miklos Szeredi , drepper@redhat.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-man@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH] utimensat() non-conformances and fixes [v3] Message-ID: <20080603120850.GZ28946@ZenIV.linux.org.uk> References: <48401E7E.9090304@gmail.com> <20080603112221.GW28946@ZenIV.linux.org.uk> <20080603113018.GA27955@shareable.org> <20080603114921.GX28946@ZenIV.linux.org.uk> <20080603120135.GA28905@shareable.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080603120135.GA28905@shareable.org> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 03, 2008 at 01:01:35PM +0100, Jamie Lokier wrote: > > with a lot of things, starting with "why utimes(2) has weaker requirements > > with NULL argument", but we are far too late to fix that. > > To be fair, having a writable file descriptor only lets you change the > mtime to "now", and having a readable file descriptor only lets you > change the atime to "now". > > Changing the times _in general_ can be seen as over-reaching those > capabilities and arguably justifies more strict checks. Which is what all questions about writability apply only to NULL case anyway...