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Date:   Thu, 30 Aug 2018 13:54:48 +0200
From:   Arnd Bergmann <>
Cc:     Paul Mackerras <>,,
        Networking <>,,,,,
        David Miller <>,
        Al Viro <>,
        y2038 Mailman List <>,
        Linux Kernel Mailing List <>
Subject: Re: [PATCH net-next 1/5] pppoe: fix PPPOEIOCSFWD compat handling

On Thu, Aug 30, 2018 at 1:04 PM Guillaume Nault <> wrote:
> On Wed, Aug 29, 2018 at 04:03:26PM +0200, Arnd Bergmann wrote:
> > Support for handling the PPPOEIOCSFWD ioctl in compat mode was added in
> > linux-2.5.69 along with hundreds of other commands, but was always broken
> > sincen only the structure is compatible, but the command number is not,
> > due to the size being sizeof(size_t), or at first sizeof(sizeof((struct
> > sockaddr_pppox)), which is different on 64-bit architectures.
> >
> And the implementation was broken until 2016 (see 29e73269aa4d ("pppoe:
> fix reference counting in PPPoE proxy")), and nobody ever noticed. I
> should probably have removed this ioctl entirely instead of fixing it.
> Clearly, it has never been used.
> If you think it's worth fixing (as opposed to dropping this ioctl or
> its compat mode), then,
> Acked-by: Guillaume Nault <>

I don't care much, but fixing it seems seems easier than coming
up with a convincing rationale for dropping.

I'll update the changelog text to include your additional background
information though, unless someone else prefers to have it dropped.


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