linux-kernel - Re: [PATCH v4 1/2] tiocsti-restrict : Add owner user namespace to tty

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Message-ID: <20170503194528.GA28882@kroah.com>
Date:   Wed, 3 May 2017 12:45:28 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Serge E. Hallyn" <serge@...lyn.com>, Matt Brown <matt@...tt.com>,
        James Morris <jmorris@...ei.org>, Jiri Slaby <jslaby@...e.com>,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jann Horn <jannh@...gle.com>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] tiocsti-restrict : Add owner user namespace to
 tty_struct

On Wed, May 03, 2017 at 12:32:07PM -0700, Kees Cook wrote:
> On Mon, Apr 24, 2017 at 6:57 AM, Serge E. Hallyn <serge@...lyn.com> wrote:
> > Quoting Matt Brown (matt@...tt.com):
> >> This patch adds struct user_namespace *owner_user_ns to the tty_struct.
> >> Then it is set to current_user_ns() in the alloc_tty_struct function.
> >>
> >> This is done to facilitate capability checks against the original user
> >> namespace that allocated the tty.
> >>
> >> E.g. ns_capable(tty->owner_user_ns,CAP_SYS_ADMIN)
> >>
> >> This combined with the use of user namespace's will allow hardening
> >> protections to be built to mitigate container escapes that utilize TTY
> >> ioctls such as TIOCSTI.
> >>
> >> See: https://bugzilla.redhat.com/show_bug.cgi?id=1411256
> >>
> >> Signed-off-by: Matt Brown <matt@...tt.com>
> >
> > Acked-by: Serge Hallyn <serge@...lyn.com>
> 
> This Ack didn't end up in the v5, but I think it stands, yes?
> 
> Greg, is the v5 okay to pull for you or would a v6 with Acks/Reviews
> included be preferred?

v6 would be great, and we are dropping patch 2 from the series, right?
I was expecting this to be resent.  I'll start looking at new patches
like this after 4.12-rc1 is out.

thanks,

greg k-h