[Yarv-devel] Prevent operations in yarv

[SASADA Koichi]

Hi,

I want to support re-writing instruction sequence on Ruby level.

ex)
   [ruby program] ->
   YARV compiler ->
   [YARV instruction sequence (base)] ->
   Ruby program (you can add it) ->
   [YARV instruction sequence (changed)]

Using this feature, I think you can make security manager.  Of course, 
you must know YARV instruction set.

Aureliano Calvo wrote:
> Hi all,
> I'm trying to implement a security manager for ruby
> like the java security manager. In order to achieve
> it, I need to be able to selectively prevent some
> things to ocurr:
> 
> * Method definition
> * Method undefinition
> * Method redefinition
> * Constant definition
> * Constant modification
> * Constant undefinition
> * Module/Class definition
> * Module/Class modification
> * Module/Class undefinition
> 
> I've tried to implement a "pure ruby" solution, but
> I've found that it's impossible to prevent the
> definition, redefinition and undefinition of a
> constant and it's very very tricky to prevent the
> other operations (for instance method redefinition can
> be prevented by aliasing every method and overloading
> the method_added method to go back to the original
> implementation). 
> 
> What would be nice is for ruby to have built in
> something like the feature described in
> http://www.rubygarden.org/ruby?EventOrientedRuby.
> 
> Is it supported by yarv/rite?
> 
> Can something like it be implemented with a "pure
> jarv" solution? (i.e. without modifying the
> interpreter or adding C modules).
> 
> Thank you very much for your time,
> Aureliano.
> 
> 
> 	
> 
> 
> 	
> 		
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-- 
SASADA Koichi at atdot dot net