linux-kernel - Re: [RFC PATCH] make CONFIG_STRICT

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Message-ID: <20141104201859.GZ22224@bivouac.eciton.net>
Date:	Tue, 4 Nov 2014 20:18:59 +0000
From:	Leif Lindholm <leif.lindholm@...aro.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	paulus@...ba.org, mpe@...erman.id.au,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	eiko.carstens@...ibm.com, linux390@...ibm.com,
	Chris Metcalf <cmetcalf@...era.com>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Greg KH <gregkh@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	dave.long@...aro.org, Christoph Hellwig <hch@...radead.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [RFC PATCH] make CONFIG_STRICT_DEVMEM a core non-debug feature

On Tue, Nov 04, 2014 at 12:02:32PM -0800, Kees Cook wrote:
> > I considered doing that, but didn't want to risk listing too many
> > details of one architecture, and too few of others.
> 
> Well, the others only say "memory mapped peripherals", so that's what
> I was suggesting adding the x86 language: it was the most detailed
> about what that would really mean to the end-user.

The problem is that this currently isn't strictly speaking true for
some architectures (at least not arm*). Without a standardised memory
map, we are exposing mapping anything not system RAM.

(Patches related to that will follow later this month.)

/
    Leif
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