linux-kernel - Re: [PATCH 06/14] Pramfs: Include files

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Message-Id: <200906241730.37151.arnd@arndb.de>
Date:	Wed, 24 Jun 2009 17:30:36 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Marco Stornelli <marco.stornelli@...il.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Jörn Engel <joern@...ybastard.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Tim Bird <tim.bird@...sony.com>,
	Chris Simmonds <chris@...t.co.uk>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/14] Pramfs: Include files

On Wednesday 24 June 2009, Marco Stornelli wrote:
> > Actually, reading from /dev/mem is only valid on real RAM. If the nvram
> > is part of an IO memory mapping, you have to do mmap()+memcpy() rather
> > than read(). So dd won't do it, but it's still easy to read from user
> > space.
> 
> For "security" reasons pram reserve the region of memory with
> reserve_mem_region_exclusive().....

That will only prevent other device drivers from stepping on it,
/dev/mem does not care about mem_region reservations.

	Arnd <><
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