Q5) Consider the following program loaded to a 32-bit x86 architecture. Suppose the stack frame is with space allocated only for the variables shown, and there is no memory gap between the local variable and saved frame pointer. Assume the user input is sufficiently long. Local variables Saved frame pointer Return address Stack structure void foobar(char *args) { unsigned int a = 4; unsigned int b = 8; static long c = 1234567890; short buf[4]; strncpy(buf, args, 24); } int main(int argc, char *argv[]) { foobar(argv[1]); return 0; } a) Will variable "a" be overwritten by strncpy and will "b" and "c" also be overwritten? Briefly explain. b) Will saved frame pointer be overwritten? If yes, how many bytes of the saved frame pointer can be overwritten? Briefly explain. c) Will the return address of foobar be overwritten? If yes, how many bytes of it can be
Q5) Consider the following program loaded to a 32-bit x86 architecture. Suppose the stack frame is with space allocated only for the variables shown, and there is no memory gap between the local variable and saved frame pointer. Assume the user input is sufficiently long. Local variables Saved frame pointer Return address Stack structure void foobar(char *args) { unsigned int a = 4; unsigned int b = 8; static long c = 1234567890; short buf[4]; strncpy(buf, args, 24); } int main(int argc, char *argv[]) { foobar(argv[1]); return 0; } a) Will variable "a" be overwritten by strncpy and will "b" and "c" also be overwritten? Briefly explain. b) Will saved frame pointer be overwritten? If yes, how many bytes of the saved frame pointer can be overwritten? Briefly explain. c) Will the return address of foobar be overwritten? If yes, how many bytes of it can be
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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![Q5) Consider the following program loaded to a 32-bit x86 architecture. Suppose the stack frame
is with space allocated only for the variables shown, and there is no memory gap between the
local variable and saved frame pointer. Assume the user input is sufficiently long.
Local variables
Saved frame pointer
Return address
Stack structure
void foobar(char *args) {
unsigned int a = 4;
unsigned int b = 8;
static long c = 1234567890;
short buf[4];
strncpy(buf, args, 24);
}
int main(int argc, char *argv[]) {
foobar(argv[1]);
return 0;
}
a) Will variable "a" be overwritten by strncpy and will "b" and "c" also be overwritten? Briefly
explain.
b) Will saved frame pointer be overwritten? If yes, how many bytes of the saved frame pointer can
be overwritten? Briefly explain.
c) Will the return address of foobar be overwritten? If yes, how many bytes of it can be
overwritten? Briefly explain.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F524d2751-fdc5-47ff-8952-3c1c230d3b82%2F043f9a73-09d5-4405-8323-f51f03f169a5%2Fnojwy3c_processed.png&w=3840&q=75)
Transcribed Image Text:Q5) Consider the following program loaded to a 32-bit x86 architecture. Suppose the stack frame
is with space allocated only for the variables shown, and there is no memory gap between the
local variable and saved frame pointer. Assume the user input is sufficiently long.
Local variables
Saved frame pointer
Return address
Stack structure
void foobar(char *args) {
unsigned int a = 4;
unsigned int b = 8;
static long c = 1234567890;
short buf[4];
strncpy(buf, args, 24);
}
int main(int argc, char *argv[]) {
foobar(argv[1]);
return 0;
}
a) Will variable "a" be overwritten by strncpy and will "b" and "c" also be overwritten? Briefly
explain.
b) Will saved frame pointer be overwritten? If yes, how many bytes of the saved frame pointer can
be overwritten? Briefly explain.
c) Will the return address of foobar be overwritten? If yes, how many bytes of it can be
overwritten? Briefly explain.
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