full-disclosure - Re: ifIndex overflow (Linux Kernel - net/core/dev.c) [maybe offtopic]

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Date: Fri, 08 Feb 2013 06:05:20 -0500
From: Daniel Corbe <corbe@...be.net>
To: Daniel Preussker <daniel@...ussker.net>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: ifIndex overflow (Linux Kernel -
	net/core/dev.c) [maybe offtopic]

That would require that you have sufficient access to create pseudo-eth
devices in the first place.  A vector of attack which requires previous
privilege escalation or which is carried out by an individual in a
position of trust is wholly uninteresting.   The former requiring too
much effort and the latter requiring a reexamination of your
interpersonal relationships.

-Daniel

Daniel Preussker <daniel@...ussker.net> writes:

> Hi,
>
> I was looking into the net/core/dev.c from the current Kernel
> (previous also have this) and found out that ifIndex gets incremented
> by an endless loop.
>
> After creating 4 billion pseudo-eth devices I finally got it to
> overflow and endless loop, had to kill the kernel - fun right?
>
>
>
> General question, is this known?
>
>
> Daniel Preussker
>
> [ Security Consultant, Network & Protocol Security and Cryptography
> [ LPI & Novell Certified Linux Engineer and Researcher
> [ +49 178 600 96 30
> [ Daniel@...ussker.Net
> [ http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x87E736968E490AA1
>
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