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Date: Fri, 9 Jun 2017 09:15:27 -0400
From: Matt Brown <>
To: Kees Cook <>, Mimi Zohar <>
Cc: James Morris <>,
 "Serge E. Hallyn" <>, LKML <>,
 linux-security-module <>,
 "" <>
Subject: Re: [PATCH v2 1/1] Add Trusted Path Execution as a stackable LSM

On 6/9/17 8:55 AM, Kees Cook wrote:
> On Fri, Jun 9, 2017 at 3:18 AM, Mimi Zohar <> 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.
> Maybe these could be merged and the interpreter string could be made
> into a configurable list?

Yes this looks promising. I'll look into integrating this.


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