NPTEL Introduction to Operating Systems Assignment 8 Answer

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NPTEL Introduction to Operating Systems Assignment 8 Answer – Here All The Questions and Answers Provided to Help All The Students and NPTEL Candidate as a Reference Purpose, It is Mandetory to Submit Your Weekly Assignment By Your Own Understand Level.

Are you looking for the Assignment Answers to NPTEL Introduction to Operating Systems Assignment 8 Answer? If Yes You are in Our Great Place to Getting Your Solution, This Post Should be help you with the Assignment answer to the National Programme on Technology Enhanced Learning (NPTEL) Course “NPTEL Introduction to Operating Systems Assignment 8 Answer”

NPTEL Introduction to Operating Systems Assignment

ABOUT THE COURSE :
Operating systems (OS) provide the crucial interface between a computer’s hardware and the applications that run on it. It allows us to write programs without bothering much about the hardware. It also ensures that the computer’s resources such as its CPU, hard disk, and memory, are appropriately utilized. In this course, we dwell into how the OS manages to do all this in an efficient manner. This is an introductory course, for students with prior knowledge of computer organization. The course is based on an OS called xv6, which in many ways is similar to the Linux operating systems.

INTENDED AUDIENCE B.E./Msc (Computer Science)

PRE-REQUISITES Good knowledge of C, Computer Organization and Architecture, x86 Assembly level programming.

This course can have Associate in Nursing unproctored programming communication conjointly excluding the Proctored communication, please check announcement section for date and time. The programming communication can have a weightage of twenty fifth towards the ultimate score.

Final score = Assignment score + Unproctored programming exam score + Proctored Exam score
  • Assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
  • ( All assignments in a particular week will be counted towards final scoring – quizzes and programming assignments). 
  • Unproctored programming exam score = 25% of the average scores obtained as part of Unproctored programming exam – out of 100
  • Proctored Exam score =50% of the proctored certification exam score out of 100
YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF ASSIGNMENT SCORE >=10/25 AND
UNPROCTORED PROGRAMMING EXAM SCORE >=10/25 AND PROCTORED EXAM SCORE >= 20/50. 
If any one of the 3 criteria is not met, you will not be eligible for the certificate even if the Final score >= 40/100. 

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1 point
ASLR randomizes the position of all variables in the stack and thereby making it difficult to perform buffer overflows.
 
 
Ans  – A
1 point
Match the following

a)Gadget        1) pseudo random number which detects buffer overflow
b)Canaries        2) Short sequence of instructions ending in a return
c)Shellcode        3) May execute in the stack if the NX bit is disabled
d)ASLR           4) helps prevent ROP attacks
 
 
 
 
Ans  –  C
1 point
How does the NX bit prevent buffer overflow attacks?
 
 
 
 
Ans  –  D
1 point
An ROP attack can potentially be detected at run-time by
 
 
 
 
Ans  –  C
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1 point
In the Bell-Lapadula model, information from top secret object will not flow to secret clearance.
 
 
Ans  –  B
1 point
A user X with secret clearance decides to transfer information to a third party Y and Y tries to make changes in the confidential class.
This breach of information can be prevented by _________________.
 
 
 
 
Ans  –  D
1 point
Programmer X has found that the source code has a buffer overflow vulnerability caused by strcpy instruction. He then used strncpy
in place of strcpy to prevent buffer overflow vulnerabilities. Which of the following is True?
 
 
 
 
Ans  –  D
1 point
Consider the following commands in a system that supports discretionary access control.
        command CONFERwrite(S, S’, O)
                          If o in A[S, O] then
                              Enter w in A[S’,O]
                         End
        command ADD_READ(S,O)
                          If w in A[S,O] then
                               enter r in A[S,0]
                      End
        Which one of the following statements is TRUE?
   A.There is no leakage of rights due to these commands
   B.A leakage may occur when an owner of an object, executes CONFERwrite command.
   C.A leakage may occur when a user with write permissions, executes ADD_READ command
 
 
 
 
Ans  –  B
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1 point
Your project manager asks you to ensure that a particular source code is free from buffer overflow vulnerabilities. Which of
the following would you need to look out for.
 
 
 
 
Ans  –  B
1 point
Arrange the following, based on the order  parameters are pushed onto the stack
a) Return address is pushed
   b)The function call parameters
   c)Previous frame pointers
   d)Local variables are allocated
 
 
 
 
Ans  –  B
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