From nobody Mon Mar 21 12:45:18 2022 X-Original-To: freebsd-security@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 5E4521A2FC90 for ; Mon, 21 Mar 2022 12:45:53 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:c2c:26d8::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4KMZ9C5H58z3t2j for ; Mon, 21 Mar 2022 12:45:51 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221] (may be forged)) by hz.grosbein.net (8.16.1/8.16.1) with ESMTPS id 22LCjlnh017069 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 21 Mar 2022 12:45:48 GMT (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: dweber@htwsaar.de Received: from [10.58.0.11] (dadv@dadvw [10.58.0.11] (may be forged)) by eg.sd.rdtc.ru (8.16.1/8.16.1) with ESMTPS id 22LCjLhf095331 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Mon, 21 Mar 2022 19:45:46 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: SSD erase question To: Damian Weber , freebsd-security@freebsd.org References: <274c8cca-80b0-9460-6754-6bb77efbb4dd@htwsaar.de> From: Eugene Grosbein Message-ID: <12d76150-d3e8-a31b-c67d-c9c8e0a9bb12@grosbein.net> Date: Mon, 21 Mar 2022 19:45:18 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 List-Id: Security issues List-Archive: https://lists.freebsd.org/archives/freebsd-security List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-security@freebsd.org X-BeenThere: freebsd-security@freebsd.org MIME-Version: 1.0 In-Reply-To: <274c8cca-80b0-9460-6754-6bb77efbb4dd@htwsaar.de> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT autolearn=disabled version=3.4.2 X-Spam-Report: * -0.0 SHORTCIRCUIT No description available. * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on hz.grosbein.net X-Rspamd-Queue-Id: 4KMZ9C5H58z3t2j X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=fail (mx1.freebsd.org: domain of eugen@grosbein.net does not designate 2a01:4f8:c2c:26d8::2 as permitted sender) smtp.mailfrom=eugen@grosbein.net X-Spamd-Result: default: False [-0.07 / 15.00]; ARC_NA(0.00)[]; R_SPF_FAIL(1.00)[-all]; FREEFALL_USER(0.00)[eugen]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_LONG(-0.99)[-0.988]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[grosbein.net]; NEURAL_SPAM_MEDIUM(1.00)[1.000]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.99)[-0.986]; RCPT_COUNT_TWO(0.00)[2]; MLMMJ_DEST(0.00)[freebsd-security]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:2a01:4f8::/32, country:DE]; RCVD_TLS_ALL(0.00)[]; MID_RHS_MATCH_FROM(0.00)[] X-ThisMailContainsUnwantedMimeParts: N 21.03.2022 19:14, Damian Weber wrote: > > Hi all, > > I'd like to have an answer on a secure FreeBSD way to erase > SSDs before giving these away to someone for reusing it. > > Is the following enough to protect confidential data > previously stored there? > > 1) dd : overwriting with random bits (complete capacity) > 2) gpart create > 3) gpart add > 4) newfs First, there is a command trim(8) that is easier to use but it gives no guarantee of "secure erase" in TRIM. Second, there is "camcontrol security -e" for secure erase, see camcontrol(8) manual page, EXAMPLES section.