From owner-freebsd-stable@FreeBSD.ORG  Fri Dec 19 13:28:06 2014
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id CD6E2706
 for <freebsd-stable@freebsd.org>; Fri, 19 Dec 2014 13:28:06 +0000 (UTC)
Received: from mx1.informatik.uni-stuttgart.de
 (mailgw.informatik.uni-stuttgart.de [129.69.211.41])
 by mx1.freebsd.org (Postfix) with ESMTP id 927091639
 for <freebsd-stable@freebsd.org>; Fri, 19 Dec 2014 13:28:06 +0000 (UTC)
Received: from azu.informatik.uni-stuttgart.de
 (azu.informatik.uni-stuttgart.de [129.69.218.66])
 by mx1.informatik.uni-stuttgart.de (Postfix) with ESMTP id 7D8E87011
 for <freebsd-stable@freebsd.org>; Fri, 19 Dec 2014 14:21:11 +0100 (CET)
Received: by azu.informatik.uni-stuttgart.de (Postfix, from userid 19691)
 id 724202E85; Fri, 19 Dec 2014 14:21:02 +0100 (MET)
Date: Fri, 19 Dec 2014 14:21:01 +0100 (MET)
From: Christian Corti <corticn@informatik.uni-stuttgart.de>
To: freebsd-stable@freebsd.org
Subject: New bug with O_CREAT|O_EXCL and NFS?
Message-ID: <alpine.SUN.2.02.1412191411020.16105@azu.informatik.uni-stuttgart.de>
User-Agent: Alpine 2.02 (SUN 1266 2009-07-14)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable/>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 19 Dec 2014 13:28:06 -0000

I've had big headaches finding the problem why "ssh -X host" destroys the 
permissions of the .Xauthority file in my NFS home directory.
'host' is any of our FreeBSD 10.1-RELEASE servers (sparc64 and amd64)
Permissions before login: 0600
Permissions after login: 0000 (ouch!)

I've found out that the cause for this lies in the Xau library (AuLock.c) 
that creates a new file in XauLockAuth:
[...]
 	creat_fd = open (creat_name, O_WRONLY | O_CREAT | O_EXCL, 0600);
[...]

Wrote a small test program that makes just that open call, and the result 
is the same: the created file has permission 0000.

This must be a regression, since I have a FreeBSD 9.0-RELEASE-p4 system 
(amd64) that does *not* have this problem.

Is this a known problem? Any hints on solving that problem? For now, I 
must add a custom /etc/ssh/sshrc file with "chmod 600 ~/.Xauthority".

Christian