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Re: [Xen-devel] how to disable the NX flag in a domU?

from [Hans-Christian Armingeon]

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Subject:	Re: [Xen-devel] how to disable the NX flag in a domU?
From:	Hans-Christian Armingeon <mog.johnny@xxxxxxx>
Date:	Sat, 8 Jul 2006 13:24:11 +0200
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Hi,

Am Mittwoch, 28. Juni 2006 12:39 schrieb Keir Fraser:
> 
> On 28 Jun 2006, at 10:15, Hans-Christian Armingeon wrote:
> 
> > I am having problems with an unclean written closed source 
> > application, which segfaults by time, because it has executable code 
> > on the stack.
> >
> > Is it possible, to disable the NX bit on modern processors for a domU? 
> > I know, this is an unclean solution - but it would be a quick fix.
> 
> You can specify 'noexec=off' to your domU Linux.

I have

extra = "noexec=off"

in my domU config, but I still get segfaults. I wrote a small program, that 
executes a printf on the stack, and it doesn't work. It works fine on x86 - it 
executes the printf on the stack.

Do I need to disable the nx flag globally on dom0?

Johnny

> 
>   -- Keir
> 
> 
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