linux-kernel - Re: vm86 segfaults with NX bit

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Message-ID: <20081120085844.6f158e08@infradead.org>
Date:	Thu, 20 Nov 2008 08:58:44 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: vm86 segfaults with NX bit

On Thu, 20 Nov 2008 16:39:06 +0100
Takashi Iwai <tiwai@...e.de> wrote:

> Hi,
> 
> X guys reported that VESA driver segfaults in vm86 mode with a kernel
> with CONFIG_X86_PAE, and it turned to be the NX bit.  See Novell
> bugzilla #443440:
> 	https://bugzilla.novell.com/show_bug.cgi?id=443440
> 
> I can confirm that the latest 2.6.28-rc still causes the same problem,
> and it disappears when booted with noexec=off option.
> 
> Also, when NX bit is reset for the first 1MB (or smaller) in
> do_sys_vm86(), it also works as expected.  But I have little clue
> where to restore the bit again.
> 
> Any good suggestions / solutions?
> 

did the code that mapped this memory setup use PROT_EXEC ?


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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