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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon, 24 Dec 2018 10:28:20 -0800
Message-ID: <CAHk-=wh1mdr+zFK+-PW-inaky+sn-M63VKuUAaYrz+D5PxpjpQ@mail.gmail.com>
Subject: Re: FYI: Userland breakage caused by udev bind commit
To:     Christian Brauner <christian@brauner.io>
Cc:     Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        Gabriel C <nix.or.die@gmail.com>,
        Marcus Meissner <christian.brauner@canonical.com>,
        LKML <linux-kernel@vger.kernel.org>
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On Mon, Dec 24, 2018 at 10:13 AM Christian Brauner <christian@brauner.io> wrote:
>
> So one possibility is to add a socket option for lib/kobject_uevent.c
> that can be set via setsockopt. We did something like this in netlink
> for strict property and header checking without breaking backwards
> compatibility.

I'd actually prefer for it to be some /sys interface or other. Maybe
it could even be per-device or class, and you could do something like

   echo "enable bind" > /sys/bus/serio/uevent

the uevent code already supports a per-node "filter" function, maybe
that notion could be extended to also have a filter for uevent types.

But I'm just handwaving. Maybe it's better per uevent socket or something.

              Linus