Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758629AbYHaTj4 (ORCPT ); Sun, 31 Aug 2008 15:39:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757914AbYHaTjq (ORCPT ); Sun, 31 Aug 2008 15:39:46 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:34112 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756229AbYHaTjp (ORCPT ); Sun, 31 Aug 2008 15:39:45 -0400 Date: Sun, 31 Aug 2008 12:39:15 -0700 (PDT) From: Linus Torvalds To: Arjan van de Ven cc: David Sanders , linux-kernel@vger.kernel.org, Jan Beulich , Andi Kleen , Ingo Molnar , Thomas Gleixner Subject: Re: [BUG] x86 kenel won't boot under Virtual PC In-Reply-To: <20080831122751.72afafb5@infradead.org> Message-ID: References: <200808311422.12525.linux@sandersweb.net> <20080831122751.72afafb5@infradead.org> User-Agent: Alpine 1.10 (LFD 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 703 Lines: 18 On Sun, 31 Aug 2008, Arjan van de Ven wrote: > > it's probably even a security bug in that I don't see what would be > stopping a ring 3 user process from executing these instructions... Well, it could be that Virtual PC raises a #UD exception in the virtual machine. In user space, that would just cause the kernel to kill the poor innocent victim. But when the kernel gets a #UD exception on what it expects to be a nop, it just won't work. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/