Operating Systems - Systems Security
Learn how to secure operating systems from malicious bugs and viruses with this free computer system security course.Publisher: NPTEL
CertificationView course modules
When designing an operating system, you need to have security goals in mind. This course will teach you how to do so, by introducing you to Secrecy, Integrity, and Availability and teaching you about the MAC or Mandatory Access Control, the Biba model, and the Bell-LaPadula model. You will then study the components for developing an access control system, Discretionary Access Control (DAC), and Role-based Access Control (RBAC). The course will also discuss leaky states and information flow policies.
A buffer overflow is a vulnerability in the system could pertain to any application running in the system. Making the stack pages non-executable can prevent buffer overflow attacks but will not completely prevent them. This course will teach you how a stack in a program is managed and how to use buffer overflows. You will learn the techniques for overcoming buffer overflow vulnerability as well as study the limitations of the return to LIBC code.
Computer security is essential not just for keeping information protected but also for preventing viruses and malware from harming your computer system and allowing programs to run more smoothly. This free course on Operating Systems Security will help any aspiring computer programmer to protect their systems against malware and intrusions. With these skills on your side, you'll give your résumé and your professional skills a solid boost, all in just a few short hours. Check out the course today.
Security Goals for an Operating System
Security Goals for an Operating System - Learning Outcomes
Introduction to Security
Information Flow Policies
Security Goals for an Operating System - Lesson Summary
Stacks and Buffer Overflows
Stacks and Buffer Overflows - Learning Outcomes
Preventing Buffer Overflow Attacks
Stacks and Buffer Overflows - Lesson Summary
Having completed this course, you will be able to:
- Distinguish between secrecy, integrity, and availability with regard to security goals.
- Define what denial of service attacks means.
- Explain when access control techniques are used.
- Describe the components for developing an access control system.
- Distinguish between DAC, MAC, and RBAC.
- Explain what a leaky state is.
- Explain information flow policies.
- Describe the mandatory access control mechanism.
- Distinguish between the Biba model and the Bell-LaPadula model.
- Explain how a stack in a program is managed.
- Define the use of buffer overflows.
- Describe how an attacker could create an exploit code.
- List some techniques to overcome buffer overflow vulnerability.
- Explain how return to libc' attacks works.
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