linux-kernel - Re: [PATCH 1/5] WIP: Add syscall unlinkat

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Message-ID: <54D08060.7070504@ahsoftware.de>
Date:	Tue, 03 Feb 2015 09:01:36 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] WIP: Add syscall unlinkat_s (currently x86* only)

Am 03.02.2015 um 08:56 schrieb Al Viro:

> While we are at it, "overwrite with zeroes" is too weak if the attacker
> might get hold of the actual hardware.  Google for details - it's far too
> long story for l-k posting.  Look for data recovery and secure data erasure...

You might read

http://link.springer.com/chapter/10.1007/978-3-540-89862-7_21

Here is an article in german about that:

http://www.heise.de/security/meldung/Sicheres-Loeschen-Einmal-ueberschreiben-genuegt-198816.html

In short, it's enough to overwrite it once with zeros,
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