linux-kernel - Re: [PATCH] init/do_mounts.c: replace sys_mount() to do

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Message-ID: <1282051520.1635.7.camel@leonhard>
Date:	Tue, 17 Aug 2010 22:25:20 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] init/do_mounts.c: replace sys_mount() to do_mount()

2010-08-17 (화), 15:15 +0200, Arnd Bergmann:
> AFAICT there is no need for the copy at all here. The reason that sys_mount
> copies to a separate page is that it gets passed an arbitrary-length user
> input.
> 
> 	Arnd

Right. But make sure to user options never exceed a page, do_mount() has
following code:

	if (data_page)
		((char *)data_page)[PAGE_SIZE - 1] = 0;


-- 
Regards,
Namhyung Kim


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