Virtual-Memory-Based Protection

DISK

Page Table 0

Main

Memory

Process 0

VPN PPN

0 1

1 3

3 DP1

4 INV

Page Table 1

Process 1

VPN PPN

0 4

1 DP0

2 INV

4 INV

DP1

DP2

PP0

Free

DP0

PP1

PP2

PP3

PP4

Free

Free

Protection implies at each instant page tables are disjoint

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