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SubjectRe: [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.

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