linux-kernel - Re: [BUG] x86 kenel won't boot under Virtual PC

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Message-ID: <alpine.LFD.1.10.0808311237290.12958@nehalem.linux-foundation.org>
Date:	Sun, 31 Aug 2008 12:39:15 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	David Sanders <linux@...dersweb.net>, linux-kernel@...r.kernel.org,
	Jan Beulich <jbeulich@...ell.com>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [BUG] x86 kenel won't boot under Virtual PC



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
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