RE: add to *Null pointer does not throw an exception.

["Steve Richter" <srichter@xxxxxxxxxxxxx>]

a book I read years ago refered to s/38 pointers as "capabilities".  That is
a pointer with built in authority to access what it points to.

Steve

-----Original Message-----
From: rpg400-l-admin@midrange.com [mailto:rpg400-l-admin@midrange.com]On
Behalf Of Scott Klement
Sent: Wednesday, October 16, 2002 6:37 PM
To: rpg400-l@midrange.com
Subject: RE: add to *Null pointer does not throw an exception.



Are you saying that one job can use a pointer that was created/manipulated
by another job?

Now THAT sounds like a bug.   You could use that for all sorts of security
exploits!

On Wed, 16 Oct 2002, Steve Richter wrote:
>
> Also, the offset of a pointer can be used as data.  Subtracting one
pointer
> from another returns a decimal difference in RPG. Consider that a pointer
> can be stored in a permanent user space. One job could add to the pointer
> and another job could use the resulting pointer.  So the add to the
pointer
> is not a superfluous operation.
>

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