linux-kernel - Re: [PATCH] lib: introduce strdup_from

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Message-ID: <20110603135303.0800e4a7@schlenkerla.am.freescale.net>
Date:	Fri, 3 Jun 2011 13:53:03 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	Timur Tabi <timur@...escale.com>, <alan@...rguk.ukuu.org.uk>,
	<linux-kernel@...r.kernel.org>, <akpm@...ux-foundation.org>
Subject: Re: [PATCH] lib: introduce strdup_from_user

On Fri, 3 Jun 2011 21:39:28 +0300
Alexey Dobriyan <adobriyan@...il.com> wrote:

> On Fri, Jun 3, 2011 at 9:34 PM, Timur Tabi <timur@...escale.com> wrote:
> > Would it be better if I did this:
> 
> The point is data should cross kernelspace/userspace boundary only once.
> 

Why does it matter, as long as it doesn't hurt the kernel if userspace
plays games (i.e. take care of the NUL termination), and it's not a
performance problem?

-Scott

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