[PATCH wayland] protocol: Bump seat to version 7 and require keymaps be private

[Daniel Stone]

On Thu, 1 Nov 2018 at 16:16, Derek Foreman
<derek.foreman.samsung at gmail.com> wrote:
> Weston commit 76829fc4eaea329d2a525c3978271e13bd76c078 (and similar
> commits for other compositors) protects the compositor's keyboard
> mapping from client damage by duplicating the keymap for every
> client.
>
> On some systems there are other potential fixes for this - such as
> using sealed memfds on linux - but we can't use them since
> essentially all client code anywhere has mapped the keyboard map
> with a MAP_SHARED mmap() call.
>
> While we can't break years worth of code, we can require any future
> clients to use MAP_PRIVATE if they use a seat version above 6.
>
> If a compositor can't use sealing or a similar facility, it should
> still protect itself with copied keymaps, but clients must always
> assume shared mapping of a keymap will fail.

\o/

Reviewed-by: Daniel Stone <daniels at collabora.com>