linux-kernel - Re: Registration Weakness in Linux Kernel's Binary formats

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Date:	Tue, 03 Oct 2006 23:54:14 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Chase Venters <chase.venters@...entec.com>
Cc:	SHELLCODE Security Research <GoodFellas@...llcode.com.ar>,
	linux-kernel@...r.kernel.org
Subject: Re: Registration Weakness in Linux Kernel's Binary formats

Ar Maw, 2006-10-03 am 16:48 -0500, ysgrifennodd Chase Venters:
> So the problem you find is that newly registered binfmts are inserted into 
> the front of the binfmt list instead of the rear, and this means that a 
> binfmt handler can slip in at runtime at run quietly before any other 
> handler?

This is a feature as anyone trying to debug versions of the elf loader
could would find out quite fast.

> 
> I'm not sure I see this as a real problem. If you can load a module into 
> kernel space and access arbitrary symbols (not to mention run in ring 0) I 
> think you can do a lot more than just hide out on the binfmt list.
> 
> Am I missing something?

Don't think so. At the point you can load code into the kernel you can
replace any code anyway.

NOTABUG

Alan

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