linux-kernel - Re: [PATCH] lib/usercopy: fix sparse errors

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Date:   Sun, 17 Dec 2017 17:31:24 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Christophe Leroy <christophe.leroy@....fr>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/usercopy: fix sparse errors

> The change is good.
> The commit message would better simply describe the problem instead
> of describing the symptom. For example, something like:
> 	The function _copy_to_user() is used to copy to address space.
> 	As such, the destination pointer should be annotated with
> 	'__user'.
> 	However, the function has the annotation wrongly, on the
> 	source instead of the destination (copy & paste error?).
> 	Fix this by moving the __user annotation to the correct
> 	argument.

FWIW, I've committed it with 

Fix misannotated out-of-line _copy_to_user()

Destination is a kernel pointer and source - a userland one
is _copy_from_user(); _copy_to_user() is the other way round.