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

["Peter Connell" <Peter.Connell@xxxxxxxxxxxxxxxxxxxx>]

That's how you pass data around via user spaces.
OS400 supplies an API that resolves a pointer to the user space.
Peter

-----Original Message-----
From: Scott Klement [mailto:klemscot@klements.com]
Sent: Thursday, October 17, 2002 11:37 AM
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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