linux-kernel - Re: [PATCH] x86, kernel: make dump

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Message-ID: <51D18B16.1000402@linux.intel.com>
Date:	Mon, 01 Jul 2013 06:58:46 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Kees Cook <keescook@...omium.org>
CC:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH] x86, kernel: make dump_pagetables a tristate

On 6/29/2013 9:05 PM, Kees Cook wrote:
> Being able to examine page tables is handy, so make this a module that
> can be loaded as needed.

I personally don't think this is a good idea due to the various
security/etc implications of this feature... should really just
be off for non-debug kernels, not "off unless you load the module"


> +#ifdef CONFIG_X86_64
> +EXPORT_SYMBOL_GPL(init_level4_pgt);
> +#else
> +EXPORT_SYMBOL_GPL(swapper_pg_dir);
> +#endif

like these really have no business in any module




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