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

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Message-ID: <4DE92EA2.60705@freescale.com>
Date:	Fri, 3 Jun 2011 13:57:38 -0500
From:	Timur Tabi <timur@...escale.com>
To:	Scott Wood <scottwood@...escale.com>
CC:	Alexey Dobriyan <adobriyan@...il.com>, <alan@...rguk.ukuu.org.uk>,
	<linux-kernel@...r.kernel.org>, <akpm@...ux-foundation.org>
Subject: Re: [PATCH] lib: introduce strdup_from_user

Scott Wood wrote:
> 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?

Ok, I don't know why I didn't notice this earlier, but this function already
exists in the kernel.  It's called strndup_user().

So I'd like to rescind this patch, please.

Note that strndup_user() has the double-access problem.

-- 
Timur Tabi
Linux kernel developer at Freescale

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