From owner-freebsd-security@FreeBSD.ORG  Wed Jul 27 07:11:59 2011
Return-Path: <owner-freebsd-security@FreeBSD.ORG>
Delivered-To: freebsd-security@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 83B8A106564A
	for <freebsd-security@freebsd.org>;
	Wed, 27 Jul 2011 07:11:59 +0000 (UTC)
	(envelope-from grarpamp@gmail.com)
Received: from mail-gx0-f182.google.com (mail-gx0-f182.google.com
	[209.85.161.182])
	by mx1.freebsd.org (Postfix) with ESMTP id 4C1008FC14
	for <freebsd-security@freebsd.org>;
	Wed, 27 Jul 2011 07:11:59 +0000 (UTC)
Received: by gxk28 with SMTP id 28so1058207gxk.13
	for <freebsd-security@freebsd.org>;
	Wed, 27 Jul 2011 00:11:58 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=mime-version:date:message-id:subject:from:to:content-type;
	bh=ryO65P0McvShe+A6Ks0ds7RJHMTuztqFsOtVL+60FNw=;
	b=T+9bYkK6aOkZ+eaP3JkD7Uv4D3qYKCOAblGlHjavdfWXB33SdEAiGt2VNcCBUXxvjC
	mCYHIavpQsksN69UDCVQPSe4AK79YQDcrVdrMq+rWdjAKHm2tCDCPe6q21GCuWEiR8b6
	pnoPUuOapzsrLutfcp0ZyLDPUCRZqYe9Js244=
MIME-Version: 1.0
Received: by 10.142.169.4 with SMTP id r4mr4036957wfe.423.1311749388299; Tue,
	26 Jul 2011 23:49:48 -0700 (PDT)
Received: by 10.142.43.1 with HTTP; Tue, 26 Jul 2011 23:49:48 -0700 (PDT)
Date: Wed, 27 Jul 2011 02:49:48 -0400
Message-ID: <CAD2Ti2_xCSzjB6eC0pUU6DHj7OSsmE_E4ikgDRx=CU3un64LoA@mail.gmail.com>
From: grarpamp <grarpamp@gmail.com>
To: freebsd-security@freebsd.org
Content-Type: text/plain; charset=UTF-8
X-Mailman-Approved-At: Wed, 27 Jul 2011 12:04:45 +0000
Subject: Malloc -Z
X-BeenThere: freebsd-security@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "Security issues \[members-only posting\]"
	<freebsd-security.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>, 
	<mailto:freebsd-security-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-security>
List-Post: <mailto:freebsd-security@freebsd.org>
List-Help: <mailto:freebsd-security-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>, 
	<mailto:freebsd-security-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 27 Jul 2011 07:11:59 -0000

Was reading malloc(3) while chasing corruption suspects.
Does the presence of -Z imply that without it, programs
can be allocated dirty (non-zeroed) memory?
If so, it seems running with -Z would be prudent if one cares.
Therefore, what is the rough percent performance
impact of -Z compared to default malloc?

Bonus:
What would be needed to make the useful streams:
/dev/one
/dev/10
/dev/01
In addition to /dev/zero.