ylfink@water.UUCP (08/24/87)
DEPARTMENT OF COMPUTER SCIENCE
UNIVERSITY OF WATERLOO
SEMINAR ACTIVITIES
ESSAY PRESENTATION
- Thursday, August 27, 1987
Mr. Peter Oswald, a graduate student of this department
will speak on ``Capacity-Based Protection for
Shoshin''.
TIME: 3:30 PM
ROOM: MC 6091A
ABSTRACT
The Shoshin project of the Computer Communications
Networks Group is intended to provide a distributed
testbed upon which various applications may be built.
There are efforts underway to provide more convenient
access to the system for multiple users. Currently,
the only protection is that each process must run in
its own disjoint address space.
In order to support the expansion of the system, a
protection scheme is necessary. The envisioned system
was some form of capability-based protection scheme.
This leads to several problems since Shoshin is
message-based as opposed to the object-based nature of
the existing systems which support capabilities. It
was also deemed necessary to maintain the simplicity of
the kernel and to provide a minimal mechanism for
protection. As a result, the scheme provides a set of
protection mechanisms upon which various protection
policies may be built.
An example of how the system would integrate with an
existing application is also presented.