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

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Message-ID: <20230702000022.iozn7lmvy2ihygdc@begin>
Date:   Sun, 2 Jul 2023 02:00:23 +0200
From:   Samuel Thibault <samuel.thibault@...-lyon.org>
To:     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-hardening@...r.kernel.org,
        Dave@...lke.cc
Subject: Re: [PATCH v3 2/2] tty: Allow TIOCSTI to be disabled

Kees Cook, le mer. 28 juin 2023 09:32:20 -0700, a ecrit:
> On Wed, Jun 28, 2023 at 08:07:16AM +0200, Samuel Thibault wrote:
> > Kees Cook, le mar. 27 juin 2023 19:48:45 -0700, a ecrit:
> > > > Really, this a serious regression for the people affected by this.
> > > 
> > > Can you send a patch adding a CAP_SYS_ADMIN exception?
> > 
> > Sure!
> 
> Thanks! (And be sure to use file->f_cred for the check[1], not "current",
> that way brltty can open the tty and drop caps and still do the ioctl.)

Actually brltty re-opens the various tty[1-6] consoles when the users
switches, so I kept just testing capable(CAP_SYS_ADMIN).

Samuel