A team of three anonymous students built a malicious I/O device. They claim that the device and its driver can only access the memory on the device, however in reality the device tries to secretly read passwords from the main memory and pass these on to an external party.

A team of three anonymous students built a malicious I/O device. They claim that the device and its driver can only access the memory on the device, however in reality the device tries to secretly read passwords from the main memory and pass these on to an external party.

LINUX+ AND LPIC-1 GDE.TO LINUX CERTIF.

5th Edition

ISBN:9781337569798

Author:ECKERT

Publisher:ECKERT

Chapter11: Compression, System Backup, And Software Installation

Section: Chapter Questions

Problem 3DE

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.

Question

A team of three anonymous students built a
malicious I/O device. They claim that the
device and its driver can only access the
memory on the device, however in reality the
device tries to secretly read passwords from
the main memory and pass these on to an
external party.
Which of the following statements are
correct?
I. Using port mapped memory makes this
malicious behaviour more difficult.
II. Reading large amounts of memory to
search for passwords can be sped up
using DMA.

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