From owner-freebsd-current@freebsd.org  Tue Jul 28 23:20:58 2015
Return-Path: <owner-freebsd-current@freebsd.org>
Delivered-To: freebsd-current@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1795C9ADC27
 for <freebsd-current@mailman.ysv.freebsd.org>;
 Tue, 28 Jul 2015 23:20:58 +0000 (UTC)
 (envelope-from gpalmer@freebsd.org)
Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org
 [IPv6:2001:1900:2254:206a::50:5])
 by mx1.freebsd.org (Postfix) with ESMTP id F3FDC323
 for <freebsd-current@freebsd.org>; Tue, 28 Jul 2015 23:20:57 +0000 (UTC)
 (envelope-from gpalmer@freebsd.org)
Received: by mailman.ysv.freebsd.org (Postfix)
 id F0CFC9ADC26; Tue, 28 Jul 2015 23:20:57 +0000 (UTC)
Delivered-To: current@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id F05A79ADC25
 for <current@mailman.ysv.freebsd.org>; Tue, 28 Jul 2015 23:20:57 +0000 (UTC)
 (envelope-from gpalmer@freebsd.org)
Received: from mail.in-addr.com (mail.in-addr.com
 [IPv6:2a01:4f8:191:61e8::2525:2525])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id B3DCB322
 for <current@freebsd.org>; Tue, 28 Jul 2015 23:20:57 +0000 (UTC)
 (envelope-from gpalmer@freebsd.org)
Received: from gjp by mail.in-addr.com with local (Exim 4.86 (FreeBSD))
 (envelope-from <gpalmer@freebsd.org>)
 id 1ZKEB4-000AEW-Gy; Wed, 29 Jul 2015 00:20:54 +0100
Date: Wed, 29 Jul 2015 00:20:54 +0100
From: Gary Palmer <gpalmer@freebsd.org>
To: Ian FREISLICH <ian.freislich@capeaugusta.com>
Cc: David Wolfskill <david@catwhisker.org>, current@freebsd.org
Subject: Re: "broken" symbolic links in /usr/lib
Message-ID: <20150728232054.GG41419@in-addr.com>
References: <20150728200034.GO1277@albert.catwhisker.org>
 <20150728184516.GN1277@albert.catwhisker.org>
 <E1ZK9QG-000CAR-KW@clue.co.za> <E1ZKAuN-000CK7-MG@clue.co.za>
 <E1ZKBJi-0000JZ-FS@clue.co.za>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <E1ZKBJi-0000JZ-FS@clue.co.za>
X-SA-Exim-Connect-IP: <locally generated>
X-SA-Exim-Mail-From: gpalmer@freebsd.org
X-SA-Exim-Scanned: No (on mail.in-addr.com); SAEximRunCond expanded to false
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 28 Jul 2015 23:20:58 -0000

On Tue, Jul 28, 2015 at 10:17:38PM +0200, Ian FREISLICH wrote:
[trim]
> So, a couple of fscks found some problems, but none causing this.
> 
> I found the actual problem.  The mount point for /usr was mode 700
> even though the root of the mounted filesystem on /usr was mode 755.
> Did I explain that clearly (quite difficult because two things are
> the same thing, although they're apparently not)?
> 
> Seems that for some reason, some but not all actions involving the
> transition between . and .. on the mount point use either the
> permissions of the mount point or the permissions of the directory
> mounted on that mount point.  In the past, the permissions in the
> mounted filesystem have always trumped the mount point, but I have
> no idea what the spec says.  Is this a bug?

As best that I can recall, the permissions of the directory underneath
the mount point has been causing problems like this for as long as I've been
using FreeBSD, which is over 20 years at this point.  It's certainly
bit me in the distant past.

Regards,

Gary