Why is it 8 here,understanding buffer overflow
- by Mask
void function(int a, int b, int c) {
char buffer1[5];
char buffer2[10];
int *ret;
ret = buffer1 + 12;
(*ret) += 8;//why is it 8??
}
void main() {
int x;
x = 0;
function(1,2,3);
x = 1;
printf("%d\n",x);
}
The above demo is from here:
http://insecure.org/stf/smashstack.html
But it's not working here:
D:\test>gcc -Wall -Wextra hw.cpp && a.exe
hw.cpp: In function `void function(int, int, int)':
hw.cpp:6: warning: unused variable 'buffer2'
hw.cpp: At global scope:
hw.cpp:4: warning: unused parameter 'a'
hw.cpp:4: warning: unused parameter 'b'
hw.cpp:4: warning: unused parameter 'c'
1
And I don't understand why it's 8 though the author thinks:
A little math tells us the distance is
8 bytes.
