linux-kernel - Re: [kernel-hardening] Re: [PATCH v7 2/2] security: tty: make TIOCSTI ioctl require CAP_SYS

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Message-ID: <20170603230048.52b7f111@lxorguk.ukuu.org.uk>
Date:   Sat, 3 Jun 2017 23:00:48 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Matt Brown <matt@...tt.com>
Cc:     "Serge E. Hallyn" <serge@...lyn.com>,
        Kees Cook <keescook@...omium.org>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Boris Lukashev <blukashev@...pervictus.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [kernel-hardening] Re: [PATCH v7 2/2] security: tty: make
 TIOCSTI ioctl require CAP_SYS_ADMIN

> TIOCSLCKTRMIOS

That one I'm more dubious about

> TIOCSLTC
> TIOCSSOFTCAR

tty_io.c also has a few and n_tty has a couple we'd want.

> 
> would it be overkill to have a sysctl kernel.ttyioctlwhitelist.X where X
> is one of the ioctls above?

Why would anyone want to change the entries on that list

Alan