linux-kernel - Re: [PATCH 4/6] procfs: Use generic_file

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Message-Id: <201003301238.18429.arnd@arndb.de>
Date:	Tue, 30 Mar 2010 11:38:18 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Kacur <jkacur@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Al Viro <viro@...iv.linux.org.uk>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 4/6] procfs: Use generic_file_llseek in /proc/vmcore

On Tuesday 30 March 2010, Frederic Weisbecker wrote:
> /proc/vmcore has no llseek and then falls down to use default_llseek.
> This is racy against read_vmcore() that directly manipulates fpos
> but it doesn't hold the bkl there so using it in llseek doesn't
> protect anything.
> 
> Let's use generic_file_llseek() instead.
> 
Acked-by: Arnd Bergmann <arnd@...db.de>
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