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Subject: Re: Question about SIOCGIFCONF
From: Eric Dumazet <eric.dumazet@gmail.com>
To: Jeffrey Merkey <jeffmerkey@gmail.com>
Cc: linux-kernel@vger.kernel.org
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Date: Fri, 28 May 2010 22:06:13 +0200
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Le vendredi 28 mai 2010 à 13:05 -0600, Jeffrey Merkey a écrit :
> The code in question is net-tools/lib/interface.c function
> if_readproc() and associated routines.  Looks like a hole.
> 
> Jeff
> 
> On Fri, May 28, 2010 at 1:02 PM, Jeffrey Merkey <jeffmerkey@gmail.com> wrote:
> > Review of the net-tools source code for IFCONFIG indicates that when
> > /proc is not loaded and/or /proc/net/dev is not available, IFCONFIG
> > will attempt to use this ioctl to determine which interfaces are
> > present in the system.  Since the ioctl will not report unbound
> > interfaces which are active, IFCONFIG will not properly report or
> > detect network adapters which are unbound.  This seems to be a hole,
> > although most of the time I assume /proc will always be mounted.
> > Someone should review this and make a decision as to whether or not
> > this could be a problem.  At any rate, it does not work as advertised.
> >

Maybe you could forget about a 20 years old legacy program and use the
real thing : ip

ip link
ip addr
...

Alternatively, you could rewrite ifconfig to use modern API.

(Not depending on /proc , at all)