linux-kernel - Re: [PATCH] NX protection for kernel data : fix 32 bits S3 suspend

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Date:	Sun, 06 Feb 2011 11:30:17 +0100
From:	Bodo Eggert 
	<arcoristkaputtundbrauchtdiesentext.7eggert@...fuerspam.de>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	castet.matthieu@...e.fr,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org,
	Matthias Hopf <mhopf@...e.de>, rjw@...k.pl,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] NX protection for kernel data : fix 32 bits S3 suspend

H. Peter Anvin <hpa@...or.com> wrote:

> In static_protections() we have:
> 
>>         /*
>>          * The BIOS area between 640k and 1Mb needs to be executable for
>>          * PCI BIOS based config access (CONFIG_PCI_GOBIOS) support.
>>          */

I don't think the CGA/MDA/VGA graphics memory areas should be executable,
and I doubt execute access to these areas is required - is it?

0xA000:0000 might be a BIOS area, if it is, you don't have a VGA and the
ROM will be exactly 64K. 0xB800 and 0xB000 SHOULD NOT be a ROM, nobody dared
to use it (I don't remember exactly where ROMs are searched).
-- 
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