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

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Date:   Fri, 9 Jun 2017 05:55:50 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>
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, 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?

-Kees

-- 
Kees Cook
Pixel Security