Generally speaking, and from my understanding, you will not be able to do:

SomeClass compile: 'initialize
�� �� ��MyEvilHack dostuff.
�� �� ��^ super initialize '

In newspeak.

And that's because you are not able to do:��

SomeClass compile: '...'

Newspeak uses object capabilities, and following those principles, you will only be able to compile and install code in a class, if somebody gives you a capability to do so.

Then, the problem is that right now Pharo's reflective API is convoluted with the base API, and thus from any piece of code you can do e.g.,:

anyObject superclass superclass allSubclasses...

A possible solution to this is to separate the reflective API from the base API.

On Sun, Apr 23, 2017 at 9:16 AM, Ben Coman <btc@openinworld.com> wrote:
On Thu, Apr 13, 2017 at 3:54 PM, Denis Kudriashov <dionisiydk@gmail.com> wrote:
>
> 2017-04-12 18:32 GMT+02:00 Ben Coman <btc@openinworld.com>:
>>
>> If you want hostile actors working directly within the Image with a full
>> environment, then Pharo is probably not suitable.�� Its easy to get hold of
>> global class from the Playground references and overwrite/compile any method
>> in the system like this...
>>
>> SomeClass compile: 'initialize
>>�� �� ��MyEvilHack dostuff.
>>�� �� ��^ super initialize '
>>
>> You might want to consider Newspeak, which runs on the same VM as Pharo
>> and has a focus on security.
>
>
> Interesting how they address your example?

Not a direct response, but in Newspeak forum I see Gliad [1] respond
to LaeMing... "Newspeak (note the capitalization) fits with your
concerns around security and asynchrony, though the reality needs
work. The main implementation runs on Smalltalk and as such is
insecurable.�� There are less complete implementations based on
compiling to Javascript and to the Truffle VM, and Ryan's Psoup VM,
which is probably the most compliant version."

[1] https://groups.google.com/forum/#!searchin/newspeaklanguage/laeming%7Csort:relevance/newspeaklanguage/0-20dj5m6wo/f5xpYnBFBgAJ

cheers -ben