To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

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Answer 1

Question

Chapter 11, Problem 8CP1

a)

Program Plan Intro

To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

b)

Program Plan Intro

To write code statement to call the countCharacters0 function within the commentText as the parameter value to calculate the number of characters in commentText and to store the value in the charCount variable inside the updateCount() function in the bw_review.js file.

c)

Program Plan Intro

To declare the wordCountBox that references the wordCount input box inside the updateCount() function in the bw_review.js file.

d)

Program Plan Intro

To change the value stored in the wordCount input box to the text string charcount/1000 inside the updateCount() function in the bw_review.js file.

e)

Program Plan Intro

To change the charCount variable if its value is greater than 1000 , change the style of the wordCount input box to a white font on a red background, otherwise set the style to a black font on a white background inside the updatecount() function in the bw_review.js file.

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The next problem concerns the following C code: /copy input string x to buf */ void foo (char *x) { char buf [8]; strcpy((char *) buf, x); } void callfoo() { } foo("ZYXWVUTSRQPONMLKJIHGFEDCBA"); Here is the corresponding machine code on a Linux/x86 machine: 0000000000400530 : 400530: 48 83 ec 18 sub $0x18,%rsp 400534: 48 89 fe mov %rdi, %rsi 400537: 48 89 e7 mov %rsp,%rdi 40053a: e8 d1 fe ff ff 40053f: 48 83 c4 18 add callq 400410 $0x18,%rsp 400543: c3 retq 0000000000400544 : 400544: 48 83 ec 08 sub $0x8,%rsp 400548: bf 00 06 40 00 mov $0x400600,%edi 40054d: e8 de ff ff ff callq 400530 400552: 48 83 c4 08 add $0x8,%rsp 400556: c3 This problem tests your understanding of the program stack. Here are some notes to help you work the problem: • strcpy(char *dst, char *src) copies the string at address src (including the terminating '\0' character) to address dst. It does not check the size of the destination buffer. You will need to know the hex values of the following characters:

A ROP (Return-Oriented Programming) attack can be used to execute arbitrary instructions by chaining together small pieces of code called "gadgets." Your goal is to create a stack layout for a ROP attack that calls a function located at '0x4018bd3'. Below is the assembly code for the function 'getbuf', which allocates 8 bytes of stack space for a 'char' array. This array is then passed to the 'gets' function. Additionally, you are provided with five useful gadgets and their addresses. Use these gadgets to construct the stack layout. Assembly for getbuf 1 getbuf: 2 sub $8, %rsp 3 mov %rsp, %rdi 4 call gets 56 add $8, %rsp ret #Allocate 8 bytes for buffer #Load buffer address into %rdi #Call gets with buffer #Restore the stack pointer #Return to caller. Stack Layout (fill in Gadgets each 8-byte section) Address Gadget Address Value (8 bytes) 0x4006a7 pop %rdi; ret 0x7fffffffdfc0 Ox4006a9 pop %rsi; ret 0x7fffffffdfb8 0x4006ab pop %rax; ret 0x7fffffffdfb0 0x7fffffffdfa8 Ox4006ad mov %rax,…

In each of the following C code snippets, there are issues that can prevent the compilerfrom applying certain optimizations. For each snippet:• Circle the line number that contains compiler optimization blocker.• Select the best modification to improve optimization.1. Which line prevents compiler optimization? Circle one: 2 3 4 5 6Suggested solution:• Remove printf or move it outside the loop.• Remove the loop.• Replace arr[i] with a constant value.1 int sum( int ∗ ar r , int n) {2 int s = 0 ;3 for ( int i = 0 ; i < n ; i++) {4 s += a r r [ i ] ;5 p r i n t f ( ”%d\n” , s ) ;6 }7 return s ;8 }2. Which line prevents compiler optimization? Circle one: 2 3 4 5 6Suggested solution:• Move or eliminate do extra work() if it’s not necessary inside the loop.• Remove the loop (but what about scaling?).• Replace arr[i] *= factor; with arr[i] = 0; (why would that help?).1 void s c a l e ( int ∗ ar r , int n , int f a c t o r ) {2 for ( int i = 0 ; i < n ; i++) {3 a r r [ i ] ∗= f a c t o r…

Answer 2

Question

Chapter 11, Problem 8CP1

a)

Program Plan Intro

To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

b)

Program Plan Intro

To write code statement to call the countCharacters0 function within the commentText as the parameter value to calculate the number of characters in commentText and to store the value in the charCount variable inside the updateCount() function in the bw_review.js file.

c)

Program Plan Intro

To declare the wordCountBox that references the wordCount input box inside the updateCount() function in the bw_review.js file.

d)

Program Plan Intro

To change the value stored in the wordCount input box to the text string charcount/1000 inside the updateCount() function in the bw_review.js file.

e)

Program Plan Intro

To change the charCount variable if its value is greater than 1000 , change the style of the wordCount input box to a white font on a red background, otherwise set the style to a black font on a white background inside the updatecount() function in the bw_review.js file.

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Answer 3

Question

Chapter 11, Problem 8CP1

a)

Program Plan Intro

To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

b)

Program Plan Intro

To write code statement to call the countCharacters0 function within the commentText as the parameter value to calculate the number of characters in commentText and to store the value in the charCount variable inside the updateCount() function in the bw_review.js file.

c)

Program Plan Intro

To declare the wordCountBox that references the wordCount input box inside the updateCount() function in the bw_review.js file.

d)

Program Plan Intro

To change the value stored in the wordCount input box to the text string charcount/1000 inside the updateCount() function in the bw_review.js file.

e)

Program Plan Intro

To change the charCount variable if its value is greater than 1000 , change the style of the wordCount input box to a white font on a red background, otherwise set the style to a black font on a white background inside the updatecount() function in the bw_review.js file.

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Answer 4

Question

Chapter 11, Problem 8CP1

a)

Program Plan Intro

To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

b)

Program Plan Intro

To write code statement to call the countCharacters0 function within the commentText as the parameter value to calculate the number of characters in commentText and to store the value in the charCount variable inside the updateCount() function in the bw_review.js file.

c)

Program Plan Intro

To declare the wordCountBox that references the wordCount input box inside the updateCount() function in the bw_review.js file.

d)

Program Plan Intro

To change the value stored in the wordCount input box to the text string charcount/1000 inside the updateCount() function in the bw_review.js file.

e)

Program Plan Intro

To change the charCount variable if its value is greater than 1000 , change the style of the wordCount input box to a white font on a red background, otherwise set the style to a black font on a white background inside the updatecount() function in the bw_review.js file.

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Answer 5

Chapter 11, Problem 8CP1

a)

Program Plan Intro

To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

b)

Program Plan Intro

To write code statement to call the countCharacters0 function within the commentText as the parameter value to calculate the number of characters in commentText and to store the value in the charCount variable inside the updateCount() function in the bw_review.js file.

c)

Program Plan Intro

To declare the wordCountBox that references the wordCount input box inside the updateCount() function in the bw_review.js file.

d)

Program Plan Intro

To change the value stored in the wordCount input box to the text string charcount/1000 inside the updateCount() function in the bw_review.js file.

e)

Program Plan Intro

To change the charCount variable if its value is greater than 1000 , change the style of the wordCount input box to a white font on a red background, otherwise set the style to a black font on a white background inside the updatecount() function in the bw_review.js file.

Answer 6

Chapter 11, Problem 8CP1

a)

Program Plan Intro

To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

Answer 7

Chapter 11, Problem 8CP1

a)

Program Plan Intro

To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

Answer 8

b)

Program Plan Intro

To write code statement to call the countCharacters0 function within the commentText as the parameter value to calculate the number of characters in commentText and to store the value in the charCount variable inside the updateCount() function in the bw_review.js file.

Answer 9

b)

Program Plan Intro

To write code statement to call the countCharacters0 function within the commentText as the parameter value to calculate the number of characters in commentText and to store the value in the charCount variable inside the updateCount() function in the bw_review.js file.

Answer 10

c)

Program Plan Intro

To declare the wordCountBox that references the wordCount input box inside the updateCount() function in the bw_review.js file.

Answer 11

c)

Program Plan Intro

To declare the wordCountBox that references the wordCount input box inside the updateCount() function in the bw_review.js file.

Answer 12

d)

Program Plan Intro

To change the value stored in the wordCount input box to the text string charcount/1000 inside the updateCount() function in the bw_review.js file.

Answer 13

d)

Program Plan Intro

To change the value stored in the wordCount input box to the text string charcount/1000 inside the updateCount() function in the bw_review.js file.

Answer 14

e)

Program Plan Intro

To change the charCount variable if its value is greater than 1000 , change the style of the wordCount input box to a white font on a red background, otherwise set the style to a black font on a white background inside the updatecount() function in the bw_review.js file.

Answer 15

e)

Program Plan Intro

To change the charCount variable if its value is greater than 1000 , change the style of the wordCount input box to a white font on a red background, otherwise set the style to a black font on a white background inside the updatecount() function in the bw_review.js file.

Answer 16

Expert Solution & Answer

Answer 17

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Answer 18

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Answer 19

Ch. 11.1 - Prob. 1QC Ch. 11.1 - Prob. 2QC Ch. 11.3 - Provide the general code to create a function...Ch. 11.3 - Prob. 2QC Ch. 11 - Prob. 1RA Ch. 11 - Prob. 2RA Ch. 11 - Prob. 3RA Ch. 11 - Prob. 4RA Ch. 11 - Prob. 5RA Ch. 11 - Prob. 6RA

To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

Solution Summary: The author explains how to create the updateCount() function, to count the total of the number of characters that the user has typed into the comment area box, and to store the value in the charCount variable.

Concept explainers

To create the updateCount() function, to count the total of the number of characters that the user has typed into the comment text area box and declare the commentText variable inside the updateCount() function in the bw_review.js file.

To write code statement to call the countCharacters0 function within the commentText as the parameter value to calculate the number of characters in commentText and to store the value in the charCount variable inside the updateCount() function in the bw_review.js file.

To declare the wordCountBox that references the wordCount input box inside the updateCount() function in the bw_review.js file.

To change the value stored in the wordCount input box to the text string charcount/1000 inside the updateCount() function in the bw_review.js file.

To change the charCount variable if its value is greater than 1000 , change the style of the wordCount input box to a white font on a red background, otherwise set the style to a black font on a white background inside the updatecount() function in the bw_review.js file.

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Chapter 11 Solutions