linux-kernel - Re: Why is FIBMAP ioctl root only?

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Message-ID: <20071122195620.79c6ecf1@the-village.bc.nu>
Date:	Thu, 22 Nov 2007 19:56:20 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: Why is FIBMAP ioctl root only?

> probably principle of least privilege; the location on physical media
> for a file is clearly something internal to the OS, and non-trusted
> users normally don't have any business knowing that. 

FIBMAP isn't correctly locked against misuse, and that requires FIBMAP is
safe against truncate and relocation. There was thread on l/k about this
a month ago or so.

Its also the wrong API (32bit, no notion of extents, compression etc)
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