Path: To represent the path of the file, first identify the type of the environment in the operating system . The path is a string or a sequence of characters separated by a forward or backward slash that contains the specified location of file. The path can be represented in two ways, Absolute path: It specifies the path of the file step by step, from the root of the directory. The path of the file starts from the root directory. Absolute path names can be represented with a forward slash (/) or backward slash (\) based upon the type of operating system. Relative path: It specifies the name from the current working directory. Relative path names can be represented with two dots (..) preceded by the forward (/) or backward slash (\)based upon the type of operating system. The following diagram represents the directory tree structure on UNIX environment. Absolute path of the file in a UNIX environment is represented by separating the directories, subdirectories, and files by a forward slash (/).

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Answer 1

Question

Chapter 11, Problem 48E

a.

Program Plan Intro

Path:

To represent the path of the file, first identify the type of the environment in the operating system.

The path is a string or a sequence of characters separated by a forward or backward slash that contains the specified location of file.

The path can be represented in two ways,

Absolute path:

It specifies the path of the file step by step, from the root of the directory.

The path of the file starts from the root directory.

Absolute path names can be represented with a forward slash (/) or backward slash (\) based upon the type of operating system.

Relative path:

It specifies the name from the current working directory.

Relative path names can be represented with two dots (..) preceded by the forward (/) or backward slash (\)based upon the type of operating system.

The following diagram represents the directory tree structure on UNIX environment.

Absolute path of the file in a UNIX environment is represented by separating the directories, subdirectories, and files by a forward slash (/).

Explanation of Solution

b.

Absolute path for “access.old” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

c.

Absolute path for “named.conf” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

d.

Absolute path for “smith” directory:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

e.

Absolute path for “week3.txt” file:

From the above directory structure -

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home...

Explanation of Solution

f.

Absolute path for “printall” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home

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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 48E

a.

Program Plan Intro

Path:

To represent the path of the file, first identify the type of the environment in the operating system.

The path is a string or a sequence of characters separated by a forward or backward slash that contains the specified location of file.

The path can be represented in two ways,

Absolute path:

It specifies the path of the file step by step, from the root of the directory.

The path of the file starts from the root directory.

Absolute path names can be represented with a forward slash (/) or backward slash (\) based upon the type of operating system.

Relative path:

It specifies the name from the current working directory.

Relative path names can be represented with two dots (..) preceded by the forward (/) or backward slash (\)based upon the type of operating system.

The following diagram represents the directory tree structure on UNIX environment.

Absolute path of the file in a UNIX environment is represented by separating the directories, subdirectories, and files by a forward slash (/).

Explanation of Solution

b.

Absolute path for “access.old” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

c.

Absolute path for “named.conf” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

d.

Absolute path for “smith” directory:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

e.

Absolute path for “week3.txt” file:

From the above directory structure -

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home...

Explanation of Solution

f.

Absolute path for “printall” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 3

Question

Chapter 11, Problem 48E

a.

Program Plan Intro

Path:

To represent the path of the file, first identify the type of the environment in the operating system.

The path is a string or a sequence of characters separated by a forward or backward slash that contains the specified location of file.

The path can be represented in two ways,

Absolute path:

It specifies the path of the file step by step, from the root of the directory.

The path of the file starts from the root directory.

Absolute path names can be represented with a forward slash (/) or backward slash (\) based upon the type of operating system.

Relative path:

It specifies the name from the current working directory.

Relative path names can be represented with two dots (..) preceded by the forward (/) or backward slash (\)based upon the type of operating system.

The following diagram represents the directory tree structure on UNIX environment.

Absolute path of the file in a UNIX environment is represented by separating the directories, subdirectories, and files by a forward slash (/).

Explanation of Solution

b.

Absolute path for “access.old” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

c.

Absolute path for “named.conf” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

d.

Absolute path for “smith” directory:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

e.

Absolute path for “week3.txt” file:

From the above directory structure -

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home...

Explanation of Solution

f.

Absolute path for “printall” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Question

Chapter 11, Problem 48E

a.

Program Plan Intro

Path:

To represent the path of the file, first identify the type of the environment in the operating system.

The path is a string or a sequence of characters separated by a forward or backward slash that contains the specified location of file.

The path can be represented in two ways,

Absolute path:

It specifies the path of the file step by step, from the root of the directory.

The path of the file starts from the root directory.

Absolute path names can be represented with a forward slash (/) or backward slash (\) based upon the type of operating system.

Relative path:

It specifies the name from the current working directory.

Relative path names can be represented with two dots (..) preceded by the forward (/) or backward slash (\)based upon the type of operating system.

The following diagram represents the directory tree structure on UNIX environment.

Absolute path of the file in a UNIX environment is represented by separating the directories, subdirectories, and files by a forward slash (/).

Explanation of Solution

b.

Absolute path for “access.old” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

c.

Absolute path for “named.conf” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

d.

Absolute path for “smith” directory:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

e.

Absolute path for “week3.txt” file:

From the above directory structure -

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home...

Explanation of Solution

f.

Absolute path for “printall” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 5

Chapter 11, Problem 48E

a.

Program Plan Intro

Path:

To represent the path of the file, first identify the type of the environment in the operating system.

The path is a string or a sequence of characters separated by a forward or backward slash that contains the specified location of file.

The path can be represented in two ways,

Absolute path:

It specifies the path of the file step by step, from the root of the directory.

The path of the file starts from the root directory.

Absolute path names can be represented with a forward slash (/) or backward slash (\) based upon the type of operating system.

Relative path:

It specifies the name from the current working directory.

Relative path names can be represented with two dots (..) preceded by the forward (/) or backward slash (\)based upon the type of operating system.

The following diagram represents the directory tree structure on UNIX environment.

Absolute path of the file in a UNIX environment is represented by separating the directories, subdirectories, and files by a forward slash (/).

Explanation of Solution

b.

Absolute path for “access.old” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

c.

Absolute path for “named.conf” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

d.

Absolute path for “smith” directory:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

e.

Absolute path for “week3.txt” file:

From the above directory structure -

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home...

Explanation of Solution

f.

Absolute path for “printall” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home

Answer 6

Chapter 11, Problem 48E

a.

Program Plan Intro

Path:

To represent the path of the file, first identify the type of the environment in the operating system.

The path is a string or a sequence of characters separated by a forward or backward slash that contains the specified location of file.

The path can be represented in two ways,

Absolute path:

It specifies the path of the file step by step, from the root of the directory.

The path of the file starts from the root directory.

Absolute path names can be represented with a forward slash (/) or backward slash (\) based upon the type of operating system.

Relative path:

It specifies the name from the current working directory.

Relative path names can be represented with two dots (..) preceded by the forward (/) or backward slash (\)based upon the type of operating system.

The following diagram represents the directory tree structure on UNIX environment.

Absolute path of the file in a UNIX environment is represented by separating the directories, subdirectories, and files by a forward slash (/).

Answer 7

Chapter 11, Problem 48E

a.

Program Plan Intro

Path:

To represent the path of the file, first identify the type of the environment in the operating system.

The path is a string or a sequence of characters separated by a forward or backward slash that contains the specified location of file.

The path can be represented in two ways,

Absolute path:

It specifies the path of the file step by step, from the root of the directory.

The path of the file starts from the root directory.

Absolute path names can be represented with a forward slash (/) or backward slash (\) based upon the type of operating system.

Relative path:

It specifies the name from the current working directory.

Relative path names can be represented with two dots (..) preceded by the forward (/) or backward slash (\)based upon the type of operating system.

The following diagram represents the directory tree structure on UNIX environment.

Absolute path of the file in a UNIX environment is represented by separating the directories, subdirectories, and files by a forward slash (/).

Answer 8

Explanation of Solution

b.

Absolute path for “access.old” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Answer 9

Explanation of Solution

b.

Absolute path for “access.old” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Answer 10

Explanation of Solution

c.

Absolute path for “named.conf” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Answer 11

Explanation of Solution

c.

Absolute path for “named.conf” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Answer 12

Explanation of Solution

d.

Absolute path for “smith” directory:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Answer 13

Explanation of Solution

d.

Absolute path for “smith” directory:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Answer 14

Explanation of Solution

e.

Absolute path for “week3.txt” file:

From the above directory structure -

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home...

Answer 15

Explanation of Solution

e.

Absolute path for “week3.txt” file:

From the above directory structure -

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home...

Answer 16

Explanation of Solution

f.

Absolute path for “printall” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home

Answer 17

Explanation of Solution

f.

Absolute path for “printall” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/).

Under the root directory “/”, there are five parent directories such as:

usr

home

Answer 18

Expert Solution & Answer

Answer 19

Expert Solution & Answer

Answer 20

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Answer 21

Ch. 11 - Prob. 1E Ch. 11 - Prob. 2E Ch. 11 - Prob. 3E Ch. 11 - Prob. 4E Ch. 11 - Prob. 5E Ch. 11 - Prob. 6E Ch. 11 - Prob. 7E Ch. 11 - Prob. 8E Ch. 11 - Prob. 9E Ch. 11 - Prob. 10E

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Explanation of Solution

b.

Absolute path for “access.old” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

c.

Absolute path for “named.conf” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

d.

Absolute path for “smith” directory:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

Explanation of Solution

Explanation of Solution

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Chapter 11 Solutions

Concept explainers

Videos

Explanation of Solution

b. Absolute path for “access.old” file: From the above directory structure, To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory. Here, the root directory starts with the forward slash (/)...

Explanation of Solution

c. Absolute path for “named.conf” file: From the above directory structure, To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory. Here, the root directory starts with the forward slash (/)...

Explanation of Solution

d. Absolute path for “smith” directory: From the above directory structure, To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory. Here, the root directory starts with the forward slash (/)...

Explanation of Solution

Explanation of Solution

Want to see the full answer?

Chapter 11 Solutions

b.

Absolute path for “access.old” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

c.

Absolute path for “named.conf” file:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...

d.

Absolute path for “smith” directory:

From the above directory structure,

To specify an absolute path, the directories must be separated by the forward slash (/) and it starts from the root directory.

Here, the root directory starts with the forward slash (/)...