linux-kernel - Re: [PATCH v2 1/1] Add Trusted Path Execution as a stackable LSM

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Message-Id: <1497014192.21594.185.camel@linux.vnet.ibm.com>
Date:   Fri, 09 Jun 2017 09:16:32 -0400
From:   Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Matt Brown <matt@...tt.com>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v2 1/1] Add Trusted Path Execution as a stackable LSM

On Fri, 2017-06-09 at 05:55 -0700, Kees Cook wrote:
> On Fri, Jun 9, 2017 at 3:18 AM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> > On Thu, 2017-06-08 at 23:50 -0400, Matt Brown wrote:
> >> >>
> >> >> *  Issues:
> >> >>    *  Can be bypassed by interpreted languages such as python. You can run
> >> >>       malicious code by doing: python -c 'evil code'
> >> >
> >> > What's the recommendation for people interested in using TPE but
> >> > having interpreters installed?
> >> >
> >>
> >> If you don't need a given interpreter installed, uninstall it. While
> >> this is common sense system hardening it especially would make a
> >> difference under the TPE threat model.
> >>
> >> I don't have a knock down answer for this. Interpreters are a hard
> >> problem for TPE.
> >
> > You might be interested in the minor LSM named "shebang", that I
> > posted as a proof of concept back in January, which restricts the
> > python interactive prompt/interpreter, but allows the scripts
> > themselves to be executed.
> 
> https://patchwork.kernel.org/patch/9547405/
> 
> Maybe these could be merged and the interpreter string could be made
> into a configurable list?

I updated shebang, but didn't bother to post it, as nobody seemed to
be interested at the time.  The updated version already has support
for the configurable list. Re-posting ...

Mimi