From: Arno Wagner <arno@wagner.name>
To: dm-crypt@saout.de
Subject: Re: [dm-crypt] Avoiding fsck.ext4 destruction of crypto_luks data
Date: Sat, 29 Dec 2012 12:52:22 +0100 [thread overview]
Message-ID: <20121229115221.GA25591@tansi.org> (raw)
In-Reply-To: <50DEB248.9040106@gmail.com>
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 <device>
>
> 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
next prev parent reply other threads:[~2012-12-29 11:52 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-27 6:12 [dm-crypt] Avoiding fsck.ext4 destruction of crypto_luks data Emily Williams
2012-12-27 9:35 ` ken
2012-12-27 9:52 ` Arno Wagner
2012-12-28 14:46 ` Sven Eschenberg
2012-12-28 15:04 ` Arno Wagner
2012-12-28 19:22 ` Milan Broz
2012-12-29 7:06 ` Arno Wagner
2012-12-29 9:05 ` Milan Broz
2012-12-29 11:52 ` Arno Wagner [this message]
2012-12-30 8:42 ` Sven Eschenberg
2012-12-30 9:39 ` Milan Broz
2012-12-30 10:53 ` Arno Wagner
2012-12-30 12:08 ` Sven Eschenberg
2012-12-30 12:25 ` Milan Broz
2012-12-30 13:19 ` Arno Wagner
2012-12-30 16:59 ` Emily Williams
2012-12-30 18:49 ` Matthias Schniedermeyer
2012-12-30 19:45 ` Arno Wagner
2012-12-31 6:37 ` Sven Eschenberg
2012-12-31 12:40 ` Richard
2012-12-27 20:29 ` Richard
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121229115221.GA25591@tansi.org \
--to=arno@wagner.name \
--cc=dm-crypt@saout.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.