netdev - Re: [PATCH 3/4] PPPOE: memory leak when socket is release()d before PPPIOCGCHAN has been called on it

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Date:	Fri, 20 Apr 2007 16:58:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mostrows@...thlink.net
Cc:	mostrows@...son.ibm.com, netdev@...r.kernel.org, florz@...rz.de
Subject: Re: [PATCH 3/4] PPPOE: memory leak when socket is release()d
 before PPPIOCGCHAN has been called on it

From: Michal Ostrowski <mostrows@...thlink.net>
Date: Tue, 13 Mar 2007 09:09:34 -0500

> below you find a patch that fixes a memory leak when a PPPoE socket is
> release()d after it has been connect()ed, but before the PPPIOCGCHAN ioctl
> ever has been called on it.
> 
> This is somewhat of a security problem, too, since PPPoE sockets can be
> created by any user, so any user can easily allocate all the machine's
> RAM to non-swappable address space and thus DoS the system.
> 
> Is there any specific reason for PPPoE sockets being available to any
> unprivileged process, BTW? After all, you need a packet socket for the
> discovery stage anyway, so it's unlikely that any unprivileged process
> will ever need to create a PPPoE socket, no? Allocating all session IDs
> for a known AC is a kind of DoS, too, after all - with Juniper ERXes,
> this is really easy, actually, since they don't ever assign session ids
> above 8000 ...
> 
> Signed-off-by: Florian Zumbiehl <florz@...rz.de>
> Acked-by: Michal Ostrowski <mostrows@...thlink.net>

Applied to net-2.6.22
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