linux-kernel - Re: [PATCH] Revert "Bluetooth: Align minimum encryption key size for LE and BR/EDR connections"

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Message-ID: <CA+E=qVfopSA90vG2Kkh+XzdYdNn=M-hJN_AptW=R+B5v3HB9eA@mail.gmail.com>
Date:   Thu, 23 May 2019 07:52:43 -0700
From:   Vasily Khoruzhick <anarsoul@...il.com>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH] Revert "Bluetooth: Align minimum encryption key size for
 LE and BR/EDR connections"

On Wed, May 22, 2019 at 12:08 AM Marcel Holtmann <marcel@...tmann.org> wrote:
>
> Hi Vasily,
>
> >> This reverts commit d5bb334a8e171b262e48f378bd2096c0ea458265.
> >>
> >> This commit breaks some HID devices, see [1] for details
> >>
> >> https://bugzilla.kernel.org/show_bug.cgi?id=203643
> >>
> >> Signed-off-by: Vasily Khoruzhick <anarsoul@...il.com>
> >> Cc: stable@...r.kernel.org
> >
> > let me have a look at this. Maybe there is a missing initialization for older HID devices that we need to handle. Do you happen to have the full btmon binary trace from controller initialization to connection attempt for me?
> >
> > Are both devices Bluetooth 2.1 or later device that are supporting Secure Simple Pairing? Or is one of them a Bluetooth 2.0 or earlier device?
>
> I am almost certain that you have a Bluetooth 2.0 mouse. I made a really stupid mistake in the key size check logic and forgot to bind it to SSP support. Can you please check the patch that I just send you.
>
> https://lore.kernel.org/linux-bluetooth/20190522070540.48895-1-marcel@holtmann.org/T/#u

This patch fixes the issue for me. Thanks!

>
> Regards
>
> Marcel
>