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

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Date:	Wed, 24 Jun 2009 08:32:50 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
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

2009/6/23 Arnd Bergmann <arnd@...db.de>:
> On Tuesday 23 June 2009, David Woodhouse wrote:
>> And dd on /dev/mem would work, surely?
>
> 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().....

>
>> I'd definitely recommend making it fixed-endian. Not doing so for JFFS2
>> was a mistake I frequently regretted.
>
> Right.
>
>        Arnd <><
>
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