linux-kernel - RE: [PATCH v3 2/2] tty: Allow TIOCSTI to be disabled

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Message-ID: <55c209a024a94d1f9c6af85dfddb11a0@AcuMS.aculab.com>
Date:   Thu, 29 Jun 2023 13:23:54 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Samuel Thibault' <samuel.thibault@...-lyon.org>,
        Kees Cook <keescook@...omium.org>
CC:     Kees Cook <kees@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Simon Brand <simon.brand@...tadigitale.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
        "Dave@...lke.cc" <Dave@...lke.cc>
Subject: RE: [PATCH v3 2/2] tty: Allow TIOCSTI to be disabled

From: Samuel Thibault
> Sent: 28 June 2023 07:07
...
> > So is there really no solution for brltty and TIOCSTI being disabled?
> 
> No, there is no way to simulate characters on the Linux console. The
> alternative would be to use uinput, but that simulates keycodes, not
> characters, thus requiring backtranslating first, which is very fragile.

It could probably be rewritten to use a pseudo-tty pair.
It might even be possible to emulate (the functionality of) TIOCSTI
in the relay process that handles the pseudo-tty.

	David

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