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Date: Wed, 14 Jun 2017 15:15:22 +0200
From: Jann Horn <>
To: Solar Designer <>
Cc: Matt Brown <>, Kernel Hardening <>
Subject: Re: Re: [PATCH v2 1/1] Add Trusted Path Execution
 as a stackable LSM

On Tue, Jun 13, 2017 at 11:27 PM, Solar Designer <> wrote:
> Matt,
> I removed most CC's like before, as I don't want my voice on this to be
> too loud.
> On Thu, Jun 08, 2017 at 11:50:32PM -0400, Matt Brown wrote:
>> On 06/08/2017 10:38 PM, Kees Cook wrote:
>> >On Wed, Jun 7, 2017 at 8:43 PM, 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.
> Interpreters are only a tip of the iceberg.

Some random related issues:

Scripts with shebang lines like "#!/usr/bin/env python" probably wouldn't
work anymore, at least not without special-case logic, because in this case,
env has to invoke python.

ssh and ssh-agent can load libraries from paths passed on the command
line, by design.
The alsa client library loads libraries from paths specified in user-owned
config files.

If you can use dd (or anything else that permits writing to a specific
position in a
file), you should be able to directly overwrite the memory of a
process using something like
"dd of=/proc/self/mem bs=1 seek=$STARTADDRESS < new_data".
I think one way to do this remotely is to use SFTP.

Bash has a built-in named "enable" that can load shared libraries directly
into the shell.

These are just some random examples I came up with relatively quickly,
there are probably more.

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