Page 109 - slides.dvi

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1.
–
–
3.
2.
if
for
Often
Operating
On
e.g.
most
cycle
set
Access
access
system
ACLs
when
first
when
Systems
used
check
(or
up
higher
—
sometimes
in
interrupt
file
Multics:
code
ACL
systems
control
stored
duty
naming
even
Protection
Control
file
by
on
reference
segment
open
storage
is
opened
check
this
to
cycle
(segment
performance
to
disk
file
for
scheme
Lists
ACL
=
isn’t
be
will
program
but
must
fault)
systems:
read
descriptor
segment:
or
in
provides
check
cache
allows
suffer)
enough
memory
is
executed
for
write
(e.g.
results
segment
ACL
made
arbitrary
of
segment.
in
to
MAC)
table
be
check
policies
software
inserted
⇒
(see.
in
e.g.
must
Unix
naming
only
use
later)
path,
on
e.g.
low
files
105
duty