[erlang-questions] Right direction ?

Joe Armstrong <>
Thu Sep 29 16:18:41 CEST 2011


On Thu, Sep 29, 2011 at 3:18 PM, David Goehrig <> wrote:
>
>
> On Wed, Sep 28, 2011 at 6:28 AM, Joe Armstrong <> wrote:
>>
>> 3) Some programs (actually any program) evaluates the BIF
>>
>>    erlang:load_module(Mod, Bin)
>>
>
> I'm curious, this looks like one place in the entire system that I'd love to
> keep an active trace log of over time.  Since we can load arbitrary byte
> code here, it is the most likely place for abuse (both good and bad).
> This makes me feel like it might be a half decent idea to implement
> http_code_server.erl that uses erlang:load_module(Mod,Bin) to directly load
> modules from remote sites, and leave code_server.erl alone for the time
> being.  This way, my default erlang can be "as secure as it ever was" and I
> can introduce all sorts of horrific hacks at this layer.
> I would still want to extend the module syntax with the -location() bit, but
> have it fall back to the http_code_server for loading.
> Thoughts?

Problem is the http_code_server.erl might load some beam code Z.beam
and Z.beam calls erlang:load_module/2 - I think it is possible to
analyse the beam code to see if this is true.

/Joe


> Dave
> --
> -=-=-=-=-=-=-=-=-=-=- http://blog.dloh.org/
>



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