From owner-freebsd-current Wed May 27 12:27:44 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA09307 for freebsd-current-outgoing; Wed, 27 May 1998 12:27:44 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from dingo.cdrom.com (dingo.cdrom.com [204.216.28.145]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id MAA09292 for ; Wed, 27 May 1998 12:27:39 -0700 (PDT) (envelope-from mike@dingo.cdrom.com) Received: from dingo.cdrom.com (localhost [127.0.0.1]) by dingo.cdrom.com (8.8.8/8.8.5) with ESMTP id LAA01163; Wed, 27 May 1998 11:23:12 -0700 (PDT) Message-Id: <199805271823.LAA01163@dingo.cdrom.com> X-Mailer: exmh version 2.0zeta 7/24/97 To: "Brian Feldman" cc: current@FreeBSD.ORG Subject: Re: current instabilities In-reply-to: Your message of "Wed, 27 May 1998 12:20:50 PDT." <19980527192053.7361.qmail@hotmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Wed, 27 May 1998 11:23:12 -0700 From: Mike Smith Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG (Restored cc: to -current) > Yes it was a graphical program, DOS so it was trying to manipulate the > memory regions of the graphics card. As I gather about vm86, supposedly > it allows low-level access to specific memory regions, does it not? No. Doscmd uses the standard FreeBSD mechanisms for low-level hardware access. > And > this does seem to be a Denial of Service at the moment, considering a > valid MS-DOS program and a world-usable doscmd can currently be used to > lock the system completely. Doscmd is setgid kmem. Arguably it shouldn't be. To be really dangerous though, it has to be run as root. > As of USER_LDT I want to know more too, so I > can understand concerns about it. Coincidentally, X was running, and > doscmd -b were my args. I'll see what -r is when I get home... I would suggest learning more before rushing into print. However, please don't take that to mean that we aren't interested in hearing about these problems. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message