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

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Date:   Tue, 27 Jun 2023 23:50:21 +0200
From:   Samuel Thibault <samuel.thibault@...-lyon.org>
To:     Kees Cook <kees@...nel.org>, Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Simon Brand <simon.brand@...tadigitale.de>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        Dave@...lke.cc
Subject: Re: [PATCH v3 2/2] tty: Allow TIOCSTI to be disabled

Samuel Thibault, le dim. 25 juin 2023 17:56:25 +0200, a ecrit:
> Samuel Thibault, le mer. 28 déc. 2022 21:57:26 +0100, a ecrit:
> > Can we perhaps just introduce a CAP_TIOCSTI that the brltty daemon would
> > be able to use? We could even make it only allow TIOCSTI on the linux
> > console (tty->ops == con_ops).
> 
> *Please* comment on this so we can progress. ATM people are
> advising each other to set dev.tty.legacy_tiocsti=1, which is just
> counter-productive in terms of security...

People are even discussing adding that configuration to the brltty
package, which e.g. on ubuntu is installed by default, and thus
defeating completely the security measure by default...

Please do contribute to the discussion so we can fix this.

Samuel