linux-kernel - Re: [PATCH 6/6] vfs: introduce FMODE_NEG_OFFSET for allowing negative f

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Message-ID: <873a24kwb5.fsf@devron.myhome.or.jp>
Date:	Mon, 18 Jan 2010 10:59:10 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Eric Paris <eparis@...hat.com>, Nick Piggin <npiggin@...e.de>,
	Andi Kleen <andi@...stfloor.org>,
	David Howells <dhowells@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	<linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 6/6] vfs: introduce FMODE_NEG_OFFSET for allowing negative f_pos

KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> writes:

>> BTW, another concern by negative "pos" value is, the following like code
>> 
>> 	pos >> shift_bits
>> 
>> it will break the above. So, I think it should be checked if not yet.
>
> Where do we check ?
>
> FMODE_NEG_OFFSET is just used by /dev/mem and /proc/<pid>/mem. And I don't
> think there are no additonal users. So, I myself don't have has such concerns...

Sorry, it's just my concern. I'm not checking real path (e.g. vfs) of
related to /dev/mem, if there is no user of such code, it's ok.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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