From owner-freebsd-current@FreeBSD.ORG Tue Oct 25 01:19:01 2011 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3A640106566C for ; Tue, 25 Oct 2011 01:19:01 +0000 (UTC) (envelope-from kaduk@mit.edu) Received: from dmz-mailsec-scanner-4.mit.edu (DMZ-MAILSEC-SCANNER-4.MIT.EDU [18.9.25.15]) by mx1.freebsd.org (Postfix) with ESMTP id CD8638FC14 for ; Tue, 25 Oct 2011 01:19:00 +0000 (UTC) X-AuditID: 1209190f-b7f6e6d0000008df-41-4ea60e83331a Received: from mailhub-auth-1.mit.edu ( [18.9.21.35]) by dmz-mailsec-scanner-4.mit.edu (Symantec Messaging Gateway) with SMTP id 8B.BD.02271.38E06AE4; Mon, 24 Oct 2011 21:19:00 -0400 (EDT) Received: from outgoing.mit.edu (OUTGOING-AUTH.MIT.EDU [18.7.22.103]) by mailhub-auth-1.mit.edu (8.13.8/8.9.2) with ESMTP id p9P1Ix7f027758; Mon, 24 Oct 2011 21:18:59 -0400 Received: from multics.mit.edu (MULTICS.MIT.EDU [18.187.1.73]) (authenticated bits=56) (User authenticated as kaduk@ATHENA.MIT.EDU) by outgoing.mit.edu (8.13.6/8.12.4) with ESMTP id p9P1Iv5b023013 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Mon, 24 Oct 2011 21:18:59 -0400 (EDT) Received: (from kaduk@localhost) by multics.mit.edu (8.12.9.20060308) id p9P1Ivb7020068; Mon, 24 Oct 2011 21:18:57 -0400 (EDT) Date: Mon, 24 Oct 2011 21:18:57 -0400 (EDT) From: Benjamin Kaduk To: "Andrey V. Elsukov" In-Reply-To: <4EA4E6B8.7040108@yandex.ru> Message-ID: References: <81477.1318015137@critter.freebsd.dk> <4E8F55CC.3060302@FreeBSD.org> <4E8F5D47.9070904@yandex.ru> <4EA4E6B8.7040108@yandex.ru> User-Agent: Alpine 1.10 (GSO 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrDIsWRmVeSWpSXmKPExsUixCmqrNvCt8zP4LC+xfkbL5ks5rz5wOTA 5DHj03wWj8MN/SwBTFFcNimpOZllqUX6dglcGb0/JzEXTGStONXwlbmBsZmli5GTQ0LARGLf tmVsELaYxIV764FsLg4hgX2MEr+uXWOFcDYwSsyaeZcdwjnAJNF15AqU08AocWDzf1aQfhYB bYmLN66AzWUTUJGY+WYj2FwRoPiuSRfAbGYBeYn/Vy4zgdjCAhYSD84sZwaxOQU0Je49ALmD g4NXwF5iwWkVkLCQwHlGia45GSC2qICOxOr9U8DG8woISpyc+YQFYqSlxLk/19kmMArOQpKa hSS1gJFpFaNsSm6Vbm5iZk5xarJucXJiXl5qka6JXm5miV5qSukmRnCgSvLvYPx2UOkQowAH oxIP76WlS/yEWBPLiitzDzFKcjApifIu5F3mJ8SXlJ9SmZFYnBFfVJqTWnyIUYKDWUmEd571 Uj8h3pTEyqrUonyYlDQHi5I4b+MOBz8hgfTEktTs1NSC1CKYrAwHh5IE71OQoYJFqempFWmZ OSUIaSYOTpDhPEDDp4PU8BYXJOYWZ6ZD5E8xKkqJ874ASQiAJDJK8+B6YYnkFaM40CvCvDdB qniASQiu+xXQYCagwcrsIFcXlyQipKQaGDv1th06Oe+Fr/dhEz3Zmz0BkpvUmjQaFvmfnrss IPnohmlTRF/3PtB58N9JuWdGhLaHx0X7M01l8rdzhVkDE+u2n7i8u515UZD8rX/RKdbf727l PLLZgu1O8+uazJ1vm9s7eTJm9sdaqH1/w8u/dFswy8n0vF0tB4x5Dp9b8Wll0NSyf9G725VY ijMSDbWYi4oTAaWIwQj/AgAA Cc: freebsd-current@freebsd.org Subject: Re: aliasing (or renaming) kern.geom.debugflags X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Oct 2011 01:19:01 -0000 On Mon, 24 Oct 2011, Andrey V. Elsukov wrote: > On 24.10.2011 1:54, Arnaud Lacombe wrote: >> NOTE >> Protection mechanisms in the geom(4) subsystem might prevent boot0cfg >> from being able to update the MBR on a mounted disk. Instructions for >> temporarily disabling these protection mechanisms can be found in the >> geom(4) manpage. Specifically, do a >> >> sysctl kern.geom.debugflags=0x10 >> >> to allow writing to the MBR, and restore it to 0 afterwards. > > This is stale message. boot0cfg might work without this. On a *mounted* disk? Surely that qualifies as an "open" for the purposes of the check. -Ben Kaduk