linux-kernel - Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses

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Date:	Fri, 1 Jul 2011 10:41:29 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Petr Tesarik <ptesarik@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary
 physical addresses

On Fri, Jul 01, 2011 at 04:37:35PM +0200, Ingo Molnar wrote:
> After initial modules have loaded i essentially disable crash.ko via 
> /proc/sys/kernel/modules_disabled so rootkits have to work a bit 
> harder than that.

Not sure for fedora as I don'[t have a kernel tree at hand right now,
but for x86 systems at least RHEL6 has the module built in.  Either
way we'll need some way to support crash properly in mainline,
preferably in a boot-time opt-in way.  I'd tend slightly toward
optionally enabling /dev/mem for it instead of a separate driver, but
if people prefer a different route I'm fine, too.

Note that for normal crash usage read only access is just fine.
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