From owner-freebsd-hackers Fri Sep 27 15: 9:59 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 97E1337B401 for ; Fri, 27 Sep 2002 15:09:58 -0700 (PDT) Received: from mailrelay1.lanl.gov (mailrelay1.lanl.gov [128.165.4.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id D99A243E7B for ; Fri, 27 Sep 2002 15:09:57 -0700 (PDT) (envelope-from rminnich@lanl.gov) Received: from acl.lanl.gov (localhost.localdomain [127.0.0.1]) by mailrelay1.lanl.gov (8.12.3/8.12.3/(ccn-5)) with SMTP id g8RM9PVU001873 for ; Fri, 27 Sep 2002 16:09:25 -0600 Received: (qmail 3122947 invoked from network); 27 Sep 2002 16:09:56 -0600 Received: from xed.acl.lanl.gov (128.165.147.191) by acl.lanl.gov with SMTP; 27 Sep 2002 16:09:56 -0600 Received: (qmail 25019 invoked by uid 3499); 27 Sep 2002 16:09:56 -0600 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 27 Sep 2002 16:09:56 -0600 Date: Fri, 27 Sep 2002 16:09:56 -0600 (MDT) From: Ronald G Minnich X-X-Sender: To: Ryan Sommers Cc: , Subject: Re: Runlevels and opcodes In-Reply-To: <1033163857.417.3.camel@lobo> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On 27 Sep 2002, Ryan Sommers wrote: > > *** But what does prevent a user-level process from executing > > wild instructions (RESET, traps, other dangerous instructions > > and undocumented features) ? > > I'm probably less knowledgeable then you are but in protected-mode > programming isn't the kernel responsible for making sure no programs go > rogue? in some ways, but "wild instructions" are the province of the architecture. You can't execute them in user mode. ron To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message