From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.saout.de ([127.0.0.1]) by localhost (mail.saout.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uofKMst99Bdc for ; Sat, 29 Dec 2012 12:52:23 +0100 (CET) Received: from v4.tansi.org (ns.km33513-03.keymachine.de [87.118.94.3]) by mail.saout.de (Postfix) with ESMTP for ; Sat, 29 Dec 2012 12:52:22 +0100 (CET) Received: from gatewagner.dyndns.org (84-74-164-49.dclient.hispeed.ch [84.74.164.49]) by v4.tansi.org (Postfix) with ESMTPA id 74A4D1404001 for ; Sat, 29 Dec 2012 12:52:22 +0100 (CET) Date: Sat, 29 Dec 2012 12:52:22 +0100 From: Arno Wagner Message-ID: <20121229115221.GA25591@tansi.org> References: <20121227095229.GA9356@tansi.org> <20121228150430.GA17491@tansi.org> <50DDF171.1080807@gmail.com> <20121229070619.GA21827@tansi.org> <50DEB248.9040106@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <50DEB248.9040106@gmail.com> Subject: Re: [dm-crypt] Avoiding fsck.ext4 destruction of crypto_luks data List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: dm-crypt@saout.de On Sat, Dec 29, 2012 at 10:05:12AM +0100, Milan Broz wrote: > On 12/29/2012 08:06 AM, Arno Wagner wrote: > > On Fri, Dec 28, 2012 at 08:22:25PM +0100, Milan Broz wrote: > > > Ext2 superblock signatures are all not wiped. Test I ran: > > Backup signatures should not be problem, (from the fsck problem > POV, not from security/old data on disk POV of course). > > Tools screams a lot if you want to use these only and primary > signature is missing. Yes, they should. I don't see this as a real problem. > Anyway, for wiping signature please suggest wipefs(8), > this tool is designed to wipe all known signatures. Added. I also give long wipe instructions, but have now wipefs as fast one. Arno > (I am trying to avoid linking cryptsetup to libblkid, but > if this happens some time in future, cryptsetup can call wipefs > directly.) > > IOW > wipefs -a > > should destroy all known signatures to blkid > (by minimalistic writes, this is not full device > wipe, so it is very quick). > > Milan > _______________________________________________ > dm-crypt mailing list > dm-crypt@saout.de > http://www.saout.de/mailman/listinfo/dm-crypt -- Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@wagner.name GnuPG: ID: CB5D9718 FP: 12D6 C03B 1B30 33BB 13CF B774 E35C 5FA1 CB5D 9718 ---- One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision. -- Bertrand Russell