linux-kernel - Re: NonExecutable Bit in 32Bit

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Message-ID: <4ac8254d0704242337m518d87c3y8a26df66632ea6e4@mail.gmail.com>
Date:	Wed, 25 Apr 2007 08:37:33 +0200
From:	"Tuncer Ayaz" <tuncer.ayaz@...il.com>
To:	"Cestonaro, Thilo (external)" 
	<Thilo.Cestonaro.external@...itsu-siemens.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: NonExecutable Bit in 32Bit

On 4/25/07, Tuncer Ayaz <tuncer.ayaz@...il.com> wrote:
> On 4/25/07, Cestonaro, Thilo (external)
> <Thilo.Cestonaro.external@...itsu-siemens.com> wrote:
> > Hey,
> >
> > > CONFIG_HIGHMEM64G=y
> > > CONFIG_HIGHMEM=y
> > > CONFIG_X86_PAE=y
> >
> > Ok in highmem it's active, whats about lowmem?
> > x86-64 is NX active for lowmem too AFAIK.
>
> It's more of an issue of having PAE enabled.
> Without PAE you are not able to use the the NX bit.
> That's the way the CPU works, not Linux.

Forgot to add:
from arch/i386/Kconfig:
config X86_PAE
	bool
	depends on HIGHMEM64G
	default y
	select RESOURCES_64BIT

> Hope this helps.
>
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