linux-kernel - Re: copy_from_user / copy_to

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Message-Id: <200610162128.45229.oliver@neukum.org>
Date:	Mon, 16 Oct 2006 21:28:44 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	mfbaustx <mfbaustx@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: copy_from_user / copy_to_user with no swap space

Am Montag, 16. Oktober 2006 21:19 schrieb mfbaustx:
> So, IF you MUST copy_from/to_user when in the context of the process, AND  
> IF you have no virtual memory/swapping, THEN must it not be true that you  
> can ALWAYS dereferences your user space pointers?

No. Your code may be only partially paged into RAM.
The same can happen for any mmaped data.

	Regards
		Oliver
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