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 12:58:01 +0100 Message-ID: <20080603115801.GY28946@ZenIV.linux.org.uk> References: <482D4665.4050401@gmail.com> <48401E7E.9090304@gmail.com> <20080603112221.GW28946@ZenIV.linux.org.uk> <20080603113018.GA27955@shareable.org> <20080603114921.GX28946@ZenIV.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jamie Lokier , 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 To: Michael Kerrisk Return-path: Content-Disposition: inline In-Reply-To: <20080603114921.GX28946-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org> Sender: linux-man-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-fsdevel.vger.kernel.org On Tue, Jun 03, 2008 at 12:49:21PM +0100, Al Viro wrote: > On Tue, Jun 03, 2008 at 01:39:07PM +0200, Michael Kerrisk wrote: > > > > Is there anything else where the file descriptor's access mode allows > > > doing things on Linux, but the standard requires a permissions check > > > each time? > > > > Jamie, > > > > I can't think of examples offhand -- but I'm also not quite sure what > > your question is about. Could you say a little more? > > "Is anything else equally stupid?", I suspect... AFAICS, behaviour in > question is inherited from futimes(2) in one of the *BSD - nothing to > do about that now (at least 10 years too late). It's rather inconsistent > 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. PS: as far as I can reconstruct what had happened there, they've got these checks buried directly in ufs_setattr() and its ilk, which worked for utimes(2), but had bitten them when they tried to do descriptor-based analog... -- 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