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Message-Id: <200708310029.20734.clemens.kol@gmx.at>
Date: Fri, 31 Aug 2007 00:29:20 +0200
From: Clemens Kolbitsch <clemens.kol@....at>
To: linux-kernel@...r.kernel.org
Subject: Copy large memory regions from & to userspace
Hi!
Just a short question: What is the correct method of copying large areas of
memory from userspace into userspace when running in kernel-mode?
According to just about any type of documentation out there something like
unsigned long *from = 0x08000000;
unsigned long *to = 0x09000000;
memcpy(to, from, 0x1000);
should be avoided as copy_from_user, put_user, etc. should be used instead...
Is there a third set of functions for direct from-userspace-to-userspace
copying or is it legitimate to assure that the first bytes in the from & to
memory areas are available and then just do the plain memcpy?
Maybe there is a simple "just use the xxx function-set" answer to that, that i
just have not ran into yet :-)
Thanks!
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