A problem with either segmented or paged address translation is timing. Suppose a user wants to read some data from an input device into memory. For efficiency during data transfer, often the actual memory address where the data are to be placed is provided to an I/O device. The real address is passed so that time-consuming address translation does not have to be performed during a very fast data

Question

transfer. What security problems does this approach bring?

What will be an ideal response?

Answer 1

Address
bounding,
possibility
of
a
process's
moving
while
the
I/O
transfer
is
going
on,
possibility
of
forging
an
address
or
modifying
it
after
translation
but
before
its
receipt
by
the
I/O
device,
possibility
of
translation
or
transmission
failure
so
that
the
I/O
device
receives
an
incorrect
address.
With
paging,
there
is
also
the
problem
of
the
amount
of
data
crossing
a
page
boundary.