[sugar] Initial Security Patches

[Marco Pesenti Gritti]

> > 2 Activities lose the ability to provide services, which might be
> > useful for direct interaction between activities. Ex. Write activity
> > getting an image from the Camera activity.
>
> Noah has thought more about this issue than I have, since he has been
> working to improve our the state of our messaging security. In the mean
> time, however, while I begin to ponder it, is there any list of
> inter-activity relationships that already exist at the present time? Or
> any discussion of proposed relationships?

Well, it's mostly a theoretical  concern. Right now we don't have any
of such relationships.  I just fear it might be a problem as the
system matures...

Marco