linux-kernel - Re: Using module private memory to simulate microkernel's memory protection

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Date:	Tue, 10 Feb 2009 15:14:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pengfei Hu <hpfei.cn@...il.com>,
	Vegard Nossum <vegard.nossum@...il.com>
Cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: Using module private memory to simulate microkernel's memory
	protection


* Pengfei Hu <hpfei.cn@...il.com> wrote:

> diff -Nurp old/arch/x86/Kconfig.debug new/arch/x86/Kconfig.debug
> --- old/arch/x86/Kconfig.debug	2008-10-10 06:13:53.000000000 +0800
> +++ new/arch/x86/Kconfig.debug	2008-12-07 19:19:40.000000000 +0800
> @@ -67,6 +67,16 @@ config DEBUG_PAGEALLOC
>  	  This results in a large slowdown, but helps to find certain types
>  	  of memory corruptions.
> 
> +config DEBUG_KM_PROTECT
> +        bool "Debug kernel memory protect"
> +        depends on DEBUG_KERNEL
> +        select DEBUG_PAGEALLOC
> +        select SLUB
> +        help
> +          Change page table's present flag to prevent other module's accidental
> +          access. This results in a large slowdown and waste more memory, but
> +          helps to find certain types of memory corruptions.

Hm, are you aware of the kmemcheck project?

	Ingo
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