netdev - Re: [PATCH v3 02/26] compat_ioctl: move simple ppp command handling into driver

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Date:   Thu, 18 Apr 2019 06:57:15 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Michal Ostrowski <mostrows@...thlink.net>,
        Dmitry Kozlov <xeb@...l.ru>,
        James Chapman <jchapman@...alix.com>,
        linux-ppp@...r.kernel.org, Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 02/26] compat_ioctl: move simple ppp command handling
 into driver

On Thu, Apr 18, 2019 at 12:53:00AM +0100, Al Viro wrote:

> Why would you want to duplicate large chunks of anything?
> The above is not even compile-tested, but...  I can put
> together a patch if you wish.  Or am I missing something
> here?

Actually, there's another broken part - pppox.  And that one
is nastier - you've just lost everything outside of protocol
family ioctls on those sockets.  Try e.g.  SIOCGIFMTU in 32bit
process on those.

We really can't reuse native ->ioctl() there - proto family
->compat_ioctl() *must* return -ENOIOCTLCMD on everything it
doesn't handle.