From owner-freebsd-security  Fri Jan 21 15:46: 5 2000
Delivered-To: freebsd-security@freebsd.org
Received: from lariat.lariat.org (lariat.lariat.org [206.100.185.2])
	by hub.freebsd.org (Postfix) with ESMTP id B89B0158A6
	for <security@FreeBSD.ORG>; Fri, 21 Jan 2000 15:46:03 -0800 (PST)
	(envelope-from brett@lariat.org)
Received: from workhorse (IDENT:ppp0.lariat.org@lariat.lariat.org [206.100.185.2])
	by lariat.lariat.org (8.9.3/8.9.3) with ESMTP id QAA25800;
	Fri, 21 Jan 2000 16:45:38 -0700 (MST)
Message-Id: <4.2.2.20000121164441.01980d30@localhost>
X-Sender: brett@localhost
X-Mailer: QUALCOMM Windows Eudora Pro Version 4.2.2 
Date: Fri, 21 Jan 2000 16:45:35 -0700
To: Poul-Henning Kamp <phk@critter.freebsd.dk>,
	Matthew Dillon <dillon@apollo.backplane.com>
From: Brett Glass <brett@lariat.org>
Subject: Re: stream.c worst-case kernel paths 
Cc: Alfred Perlstein <bright@wintelcom.net>, security@FreeBSD.ORG
In-Reply-To: <7192.948496931@critter.freebsd.dk>
References: <Your message of "Fri, 21 Jan 2000 15:11:06 PST." <200001212311.PAA64559@apollo.backplane.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Sender: owner-freebsd-security@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

At 04:22 PM 1/21/2000 , Poul-Henning Kamp wrote:

>It makes a lot of sense to do cheap (relative to the checksum)
>checks on the packet before we do the checksum, as long as we
>don't modify any state before the checksum is validated.

Agreed. This satisfies both Alfred's and Matt's constraints.

--Brett



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