From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751878AbbAWWQv (ORCPT ); Fri, 23 Jan 2015 17:16:51 -0500 Received: from h1446028.stratoserver.net ([85.214.92.142]:37432 "EHLO mail.ahsoftware.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751487AbbAWWQs (ORCPT ); Fri, 23 Jan 2015 17:16:48 -0500 Message-ID: <54C2C836.2010300@ahsoftware.de> Date: Fri, 23 Jan 2015 23:16:22 +0100 From: Alexander Holler User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: Richard Weinberger CC: LKML , linux-kbuild , Michal Marek , David Howells , Linus Torvalds Subject: Re: [PATCH] modsign: overwrite keys with zero before deleting them References: <1421976009-9819-1-git-send-email-holler@ahsoftware.de> <1422050221-28345-1-git-send-email-holler@ahsoftware.de> In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 23.01.2015 um 23:06 schrieb Richard Weinberger: > On Fri, Jan 23, 2015 at 10:57 PM, Alexander Holler wrote: >> This is for the more paranoid people, also it's >> questionable what paranoid nowadays means. > > Isn't this complete useless when modern filesystems like btrfs or > storage devices like SSDs are used? On SSDs it's likely useless, unfortunately. In regard to filesystems it depends (how knows what thay all do?). But it doesn't cost anything and might still be worth to use on conventional harddisks with several filesystems. I would like to have a secure-delete for FLASH based drives, but I assume it will need some time until someone established something like secure-trim and a userspace utility will be available. Regards, Alexander Holler