linux-kernel - Re: file offset corruption on 32-bit machines?

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Message-ID: <20080414175452.27c3652d@core>
Date:	Mon, 14 Apr 2008 17:54:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jan Kara <jack@...e.cz>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Bodo Eggert <7eggert@....de>,
	Diego Calleja <diegocg@...il.com>,
	Jiri Kosina <jkosina@...e.cz>, Michal Hocko <mhocko@...e.cz>,
	Meelis Roos <mroos@...ux.ee>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: file offset corruption on 32-bit machines?

>   Well, but imagine you have a file /proc/my_secret_file from which you
> are able to read from position A:a and B:b but not from position
> A:b. Concievably, checks for the file position could be bypassed because of
> this race... I know this is kind of dumb example but I can imagine someone

Unlikely as the ppos passed to the driver is a private copy and the user
could equally use pread/pwrite to specify that offset.
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