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Rory Hewitt wrote:
The user space *doesn't* know that it's a pointer - as you pointed out, it's
up to the programs that reference that data to specify that it's a pointer.
However, the difference between a user space and a data area/data queue etc.
is that you *can* *technically* store a pointer inside a user space, because
the user space can also store the tags etc.
Before I put this completely to bed ... since I can send a pointer to
another job in a user space ... is there some way the system protects
itself from a pointer in a job being set to an arbitrary location (that
may actually exist in another job)?
When a pointer is passed via a user space, is it tagged in some way to
indicate that the memory location is explicitly being shared?
One other thing ... when you do pass a pointer from one job to another
via user space, is the memory the pointer refers to as writable as any
other memory? So, could program A pass a pointer to space in it's job
to program B, and program B could then overwrite storage in program A's job?
david
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