Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755596AbbBCIBo (ORCPT ); Tue, 3 Feb 2015 03:01:44 -0500 Received: from h1446028.stratoserver.net ([85.214.92.142]:34194 "EHLO mail.ahsoftware.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752180AbbBCIBn (ORCPT ); Tue, 3 Feb 2015 03:01:43 -0500 Message-ID: <54D08060.7070504@ahsoftware.de> Date: Tue, 03 Feb 2015 09:01:36 +0100 From: Alexander Holler User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: Al Viro CC: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/5] WIP: Add syscall unlinkat_s (currently x86* only) References: <1422896713-25367-1-git-send-email-holler@ahsoftware.de> <1422896713-25367-2-git-send-email-holler@ahsoftware.de> <20150203060542.GZ29656@ZenIV.linux.org.uk> <54D071AA.1030302@ahsoftware.de> <20150203075616.GA29656@ZenIV.linux.org.uk> In-Reply-To: <20150203075616.GA29656@ZenIV.linux.org.uk> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 792 Lines: 20 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, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/