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Date: Mon, 20 Jun 2011 09:41:24 +0200
From: Ingo Molnar <mingo@elte.hu>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ryan Mallon <rmallon@gmail.com>, Petr Tesarik <ptesarik@suse.cz>,
        Andrew Morton <akpm@linux-foundation.org>,
        Fenghua Yu <fenghua.yu@intel.com>, Ingo Molnar <mingo@redhat.com>,
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        Dave Jones <davej@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary
 physical addresses
Message-ID: <20110620074124.GB24716@elte.hu>
References: <201106171038.25988.ptesarik@suse.cz>
 <20110617093032.GA19235@elte.hu>
 <4DFE7FF9.9070406@gmail.com>
 <4DFE89E0.5020509@zytor.com>
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* H. Peter Anvin <hpa@zytor.com> wrote:

> There are some test drivers which really want /dev/mem to work.

Test drivers and test hardware with zero enumeration can use below 4G 
addresses just fine.

Also, debugging is not an issue and some non-default kernel or boot 
option can enable any sort of device i guess, so my main worry isnt 
really security but that we should stand in the way of the apparent 
practice of *shipping* user-space drivers that use /dev/mem ...

Thanks,

	Ingo
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