Subject: Re: The disappearing sys_call_table export.
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jesse Pollard <jesse@cats-chateau.net>
Cc: Chuck Ebbert <76306.1226@compuserve.com>,
       "viro@parcelfarce.linux.theplanet.co.uk" 
	<viro@parcelfarce.linux.theplanet.co.uk>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Terje Eggestad <terje.eggestad@scali.com>
In-Reply-To: <03050809564900.09057@tabby>
References: <200305081009_MC3-1-37FA-2408@compuserve.com>
	 <03050809564900.09057@tabby>
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Date: 08 May 2003 16:22:22 +0100
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> M$ seems to treat everything as a disk file (even "pipes" are implemented
> as temporary files).

So did original Unix, it was a disk file that was anonymous and just
used the direct pointers to blocks for a ring buffer. Storing pipe data
in RAM in the old days was a hideous waste of resources.

> There is NO reason a custom filesystem cannot be layered over other 
> filesystems. It might not be done today (though the references to "userfs"
> keep showing up in such discussions).

Erez Zadoz (not sure of the spelling) did some stacking fs modules on
Linux

> Fix the vulnerability. Then there won't be a virus.

But you don't know if its fixed and if there are any more holes without
being able to detect attackers be they electronic or human.


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