From: Daniel Kaminski <maniel.rulez@...>
Date: 2008-07-20T06:01:12+09:00
Subject: Re: execve syscall in ruby

Rolando Abarca wrote:
> On 19-07-2008, at 15:36, Daniel Kaminski wrote:
> 
>> That's me again, now i know that i have to terminate an array with  
>> null
>> pointer, is this possible in ruby?
> 
> NULL is just a 0 (zero):
> 
> $ ruby -e "syscall(11, '/home/rolando/test.rb', ['true', 'lala',
> 0].pack('ppi'), ['X=1', 0].pack('pi'))"
> ["lala"]
> {"X"=>"1"}
> 
> $ cat test.rb
> #!/usr/local/bin/ruby
> 
> p ARGV
> p ENV


-e:1:in `syscall': string contains null byte (ArgumentError)
        from -e:1

It's the same error when tried ['true', nil].pack('p*'), result is the 
same too, it adds '000\000\000\000'.
Do you have patched ruby build or something? i managed to make it work 
by commenting few lines from string.c responsible for above exception.

regards:-)

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