From owner-freebsd-bugs@freebsd.org  Thu Sep  7 15:46:13 2017
Return-Path: <owner-freebsd-bugs@freebsd.org>
Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8D570E00684
 for <freebsd-bugs@mailman.ysv.freebsd.org>;
 Thu,  7 Sep 2017 15:46:13 +0000 (UTC)
 (envelope-from bugzilla-noreply@freebsd.org)
Received: from kenobi.freebsd.org (kenobi.freebsd.org
 [IPv6:2001:1900:2254:206a::16:76])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 1D01D6CF8F
 for <freebsd-bugs@FreeBSD.org>; Thu,  7 Sep 2017 15:46:12 +0000 (UTC)
 (envelope-from bugzilla-noreply@freebsd.org)
Received: from bugs.freebsd.org ([127.0.1.118])
 by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v87FkCK6094258
 for <freebsd-bugs@FreeBSD.org>; Thu, 7 Sep 2017 15:46:12 GMT
 (envelope-from bugzilla-noreply@freebsd.org)
From: bugzilla-noreply@freebsd.org
To: freebsd-bugs@FreeBSD.org
Subject: [Bug 222077] geli(8) writing uninitialized memory out to disk
Date: Thu, 07 Sep 2017 15:46:12 +0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 11.1-RELEASE
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: max@mxcrypt.com
X-Bugzilla-Status: New
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: ---
X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-222077-8-1PD2e3q1VV@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-222077-8@https.bugs.freebsd.org/bugzilla/>
References: <bug-222077-8@https.bugs.freebsd.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs/>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
 <mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 07 Sep 2017 15:46:13 -0000

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222077

--- Comment #3 from Maxim Khitrov <max@mxcrypt.com> ---
I think the same issue also affects geli metadata with 4k sector size. I was
able to reproduce this using the script below, but it took many iterations.
Once it happened, the same data was returned every time, so I think it's ju=
st a
matter of getting the right memory page allocated. The result is that the l=
ast
sector contains 512 bytes of metadata followed by 3584 bytes of uninitializ=
ed
memory.

#!/bin/sh
dd if=3D/dev/zero of=3Dgelitest.md bs=3D8K count=3D1 status=3Dnone
md=3D$(mdconfig -f gelitest.md -S 4096) || exit
echo 'fakekey' | geli init -B none -K - -P $md || exit
mdconfig -du $md
hd gelitest.md

--=20
You are receiving this mail because:
You are the assignee for the bug.=