linux-hardening - Re: [PATCH v3 2/2] tty: Allow TIOCSTI to be disabled

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Message-ID: <20230629133219.5z667lt6pz25exkf@begin>
Date:   Thu, 29 Jun 2023 15:32:19 +0200
From:   Samuel Thibault <samuel.thibault@...-lyon.org>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     Kees Cook <keescook@...omium.org>, 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

David Laight, le jeu. 29 juin 2023 13:23:54 +0000, a ecrit:
> 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.

That's what yasr does for instance, but that does not make the login
prompt accessible, which is a must (just like sighted users don't log in
blindly...)

Samuel