EBK STARTING OUT WITH VISUAL BASIC
8th Edition
ISBN: 9780135205082
Author: Irvine
Publisher: VST
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Expert Solution & Answer
Chapter 2.1, Problem 2.11CP
Explanation of Solution
Addition of a control to a form:
- All the controls are stored in a memory location called Toolbox.
- Select the required control from the Toolbox and double cli...
Expert Solution & Answer
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Students have asked these similar questions
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…
Chapter 2 Solutions
EBK STARTING OUT WITH VISUAL BASIC
Ch. 2.1 - Prob. 2.1CPCh. 2.1 - Prob. 2.2CPCh. 2.1 - What is the purpose of an objects sizing handles?Ch. 2.1 - What must each form and control in an applications...Ch. 2.1 - Prob. 2.5CPCh. 2.1 - Prob. 2.6CPCh. 2.1 - Prob. 2.7CPCh. 2.1 - What does a forms Text property determine?Ch. 2.1 - Prob. 2.9CPCh. 2.1 - Prob. 2.10CP
Ch. 2.1 - Prob. 2.11CPCh. 2.1 - Prob. 2.12CPCh. 2.3 - What must be added to an application so that it...Ch. 2.3 - Prob. 2.14CPCh. 2.3 - Prob. 2.15CPCh. 2.3 - Prob. 2.16CPCh. 2.3 - Prob. 2.17CPCh. 2.3 - Prob. 2.18CPCh. 2.3 - Prob. 2.19CPCh. 2.3 - Prob. 2.20CPCh. 2.3 - Prob. 2.21CPCh. 2.4 - Prob. 2.22CPCh. 2.4 - Prob. 2.23CPCh. 2.4 - Prob. 2.24CPCh. 2.4 - Prob. 2.25CPCh. 2.4 - Prob. 2.26CPCh. 2.4 - Prob. 2.27CPCh. 2.4 - Prob. 2.28CPCh. 2.4 - Prob. 2.29CPCh. 2.4 - What is a literal?Ch. 2.4 - Prob. 2.31CPCh. 2.4 - Prob. 2.32CPCh. 2.4 - Prob. 2.33CPCh. 2.7 - What is a PictureBox control used for?Ch. 2.7 - Prob. 2.35CPCh. 2.7 - Prob. 2.36CPCh. 2.7 - Prob. 2.37CPCh. 2.7 - Prob. 2.38CPCh. 2.7 - Prob. 2.39CPCh. 2.8 - Prob. 2.40CPCh. 2.8 - Prob. 2.41CPCh. 2.8 - Suppose an application has a Picture Box control...Ch. 2.8 - Prob. 2.43CPCh. 2.9 - Prob. 2.44CPCh. 2.9 - The keyword Me is shorthand for referring to what?Ch. 2.10 - Prob. 2.46CPCh. 2.10 - What character does a comment begin with in Visual...Ch. 2.10 - Prob. 2.48CPCh. 2.10 - Why do programmers insert blank lines and...Ch. 2.11 - Prob. 2.50CPCh. 2.11 - Prob. 2.51CPCh. 2.11 - Prob. 2.52CPCh. 2.11 - Prob. 2.53CPCh. 2.11 - What type of error usually causes the program to...Ch. 2.11 - Prob. 2.55CPCh. 2.11 - Prob. 2.56CPCh. 2.11 - How do you find runtime and logic errors in a...Ch. 2.12 - Prob. 2.58CPCh. 2.12 - Prob. 2.59CPCh. 2.12 - Prob. 2.60CPCh. 2.12 - Prob. 2.61CPCh. 2.13 - Prob. 2.62CPCh. 2.13 - Prob. 2.63CPCh. 2.13 - Prob. 2.64CPCh. 2 - Prob. 1MCCh. 2 - Prob. 2MCCh. 2 - _____ is the name of the blank form that Visual...Ch. 2 - Prob. 4MCCh. 2 - A(n) _____ is a procedure that executes when a...Ch. 2 - Prob. 6MCCh. 2 - In programming we use the term string to mean...Ch. 2 - Prob. 8MCCh. 2 - Prob. 9MCCh. 2 - Prob. 10MCCh. 2 - Prob. 11MCCh. 2 - Prob. 12MCCh. 2 - Prob. 13MCCh. 2 - Prob. 14MCCh. 2 - Prob. 15MCCh. 2 - Prob. 16MCCh. 2 - The equal sign ( = ) is known as the ___________...Ch. 2 - The standard notation for referring to a controls...Ch. 2 - _____ is a feature of Visual Studio that provides...Ch. 2 - Prob. 20MCCh. 2 - Prob. 21MCCh. 2 - Prob. 22MCCh. 2 - Prob. 23MCCh. 2 - Prob. 24MCCh. 2 - Prob. 25MCCh. 2 - Programmers commonly use blank lines and...Ch. 2 - To close an applications form in code, you use the...Ch. 2 - T F: Changing an objects Text property also...Ch. 2 - Prob. 2TFCh. 2 - T F: The forms title is displayed in the bar along...Ch. 2 - Prob. 4TFCh. 2 - Prob. 5TFCh. 2 - Prob. 6TFCh. 2 - Prob. 7TFCh. 2 - Prob. 8TFCh. 2 - Prob. 9TFCh. 2 - Prob. 10TFCh. 2 - Prob. 11TFCh. 2 - Prob. 12TFCh. 2 - Prob. 13TFCh. 2 - Prob. 14TFCh. 2 - Prob. 15TFCh. 2 - T F: Comments are ignored by the Visual Basic...Ch. 2 - Prob. 17TFCh. 2 - Prob. 18TFCh. 2 - What does a bounding box indicate about an object...Ch. 2 - Prob. 2SACh. 2 - What determines an objects appearance and other...Ch. 2 - Prob. 4SACh. 2 - Prob. 5SACh. 2 - What steps must you perform to change a forms Size...Ch. 2 - Prob. 7SACh. 2 - Prob. 8SACh. 2 - Prob. 9SACh. 2 - Prob. 10SACh. 2 - Prob. 11SACh. 2 - Prob. 12SACh. 2 - Prob. 13SACh. 2 - Prob. 14SACh. 2 - Prob. 15SACh. 2 - Prob. 16SACh. 2 - Prob. 17SACh. 2 - Prob. 1AWCh. 2 - Prob. 2AWCh. 2 - Prob. 3AWCh. 2 - Prob. 4AWCh. 2 - Suppose an applications GUI has a PictureBox...Ch. 2 - Prob. 1WDTCh. 2 - Prob. 2WDTCh. 2 - Prob. 3WDTCh. 2 - Open the Error1 project from the student sample...Ch. 2 - Open the Error2 project from the student sample...Ch. 2 - Look at the following list of Latin words and...Ch. 2 - Create an application that displays a simple math...Ch. 2 - Prob. 3PCCh. 2 - Prob. 4PCCh. 2 - State Abbreviations The following table shows...Ch. 2 - Prob. 6PCCh. 2 - Prob. 7PCCh. 2 - Joke and Punch line A joke typically has two...
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