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

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Message-ID: <23161.1360701261@turing-police.cc.vt.edu>
Date: Tue, 12 Feb 2013 15:34:21 -0500
From: Valdis.Kletnieks@...edu
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]

On Thu, 07 Feb 2013 20:28:31 +0100, Daniel Preussker said:
> 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?

I wonder what /proc/slabinfo and related memory statistics looked like after
3.9 billion devices created.  You'll need a fairly beefy box to roll that
counter without OOM'ing the kernel first.

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