From owner-freebsd-security  Fri May 21  9:50: 5 1999
Delivered-To: freebsd-security@freebsd.org
Received: from flood.ping.uio.no (flood.ping.uio.no [129.240.78.31])
	by hub.freebsd.org (Postfix) with ESMTP id 6A82114DD3
	for <freebsd-security@FreeBSD.ORG>; Fri, 21 May 1999 09:50:01 -0700 (PDT)
	(envelope-from des@flood.ping.uio.no)
Received: (from des@localhost)
	by flood.ping.uio.no (8.9.3/8.9.1) id SAA79941;
	Fri, 21 May 1999 18:49:51 +0200 (CEST)
	(envelope-from des)
To: "Patrick Bihan-Faou" <patrick@mindstep.com>
Cc: Darren Reed <darrenr@reed.wattle.id.au>,
	Gregory Sutter <gsutter@pobox.com>, wes@softweyr.com,
	imp@harmony.village.org, ilmar@ints.ru, posix1e@cyrus.watson.org,
	freebsd-security@FreeBSD.ORG
Subject: Re: secure deletion
References: <19990520145800.B5E31150AF@hub.freebsd.org>
From: Dag-Erling Smorgrav <des@flood.ping.uio.no>
Date: 21 May 1999 18:49:51 +0200
In-Reply-To: "Patrick Bihan-Faou"'s message of "Thu, 20 May 1999 10:57:52 -0400"
Message-ID: <xzpzp2ypdu8.fsf@localhost.ping.uio.no>
Lines: 12
X-Mailer: Gnus v5.5/Emacs 19.34
Sender: owner-freebsd-security@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

"Patrick Bihan-Faou" <patrick@mindstep.com> writes:
> I agree with that last statement. An implementation on FreeBSD probably does
> not need to write multiple times to the disk.

Wouldn't work, anyway, unless you disable write caching (not just on
the disk, but in the disk driver as well - no soft updates!).
Otherwise, all passes but the last will be ignored, unless you wipe a
really big file (too big to fit in cache).

DES
-- 
Dag-Erling Smorgrav - des@flood.ping.uio.no


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-security" in the body of the message