linux-kernel - Re: Reading /dev/mem by dd

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Date:	Thu, 12 Nov 2009 17:49:16 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Henrique de Moraes Holschuh" <hmh@....eng.br>
Cc:	"Andi Kleen" <andi@...stfloor.org>,
	"Robert Hancock" <hancockrwd@...il.com>,
	"Anton D. Kachalov" <mouse@...c.ru>, linux-kernel@...r.kernel.org
Subject: Re: Reading /dev/mem by dd

> In this case, the problem seems to be access over /dev/mem to stuff the
> kernel is already taking care of.  Certainly "as safe as possible" does

Which is often what is desired - eg debugging driver stuff.

> not have to mean making /dev/mem useless for whatever good uses it has.

It does. Plain and simple.

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