Question on environment variable overflow and SIGURG

[Minchu Mo <morris_minchu () iwon com>]

I am doing some practice on environment variable 
overflow on sparc/solaris. But  the environment 
variable are string based, in other word, I can't have 
\x00 byte inside the variable, and as a result, I can't 
put the heap address inside cuz this won't be parsed 
in correctly. Anybody can tell me wether there is 
anyway aroud this?

Also, For SIGURG from OOB signal(in 
SPARC/solaris) ,  will its signal handler block another 
SIGURG from re-entering untill the first one got 
handled?