Message-Id: <200605221429.k4METL5D011740@turing-police.cc.vt.edu>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Arjan van de Ven <arjan@infradead.org>, "Theodore Ts'o" <tytso@mit.edu>,
       akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Add user taint flag
In-Reply-To: Your message of "Mon, 22 May 2006 15:35:48 BST."
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From: Valdis.Kletnieks@vt.edu
References: <E1FhwyO-0001YQ-O1@candygram.thunk.org> <1148307276.3902.71.camel@laptopd505.fenrus.org>
            <1148308548.17376.44.camel@localhost.localdomain>
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On Mon, 22 May 2006 15:35:48 BST, Alan Cox said:
> On Llu, 2006-05-22 at 16:14 +0200, Arjan van de Ven wrote:
> > we should then patch the /dev/mem driver or something to set this :)
> > (well and possibly give it an exception for now for PCI space until the
> > X people fix their stuff to use the proper sysfs stuff)
> 
> /dev/mem is used for all sorts of sane things including DMIdecode.
> Tainting on it isn't terribly useful. Mind you this whole user taint
> patch seems bogus as it can only be set by root owned processes so
> doesn't appear to do the job it is intended for - perhaps Ted can
> explain ?

Taint on write to /dev/mem, perhaps?  I don't think DMIdecode needs to
scribble on /dev/mem, does it?  (Figure if a userspace program runs OK
on a recent Fedora or RedHat kernel, it doesn't need to scribble on /dev/mem
too much, because the vast majority of it is lopped out via a patch....)

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