Solved Homework: Question: We are making a cool program to greet our clients. It expects two arguments you can type to a tex…

We are making a cool program to greet our clients. It expects two arguments you can type to a textbox: your name and the length of your name. Simple enough, right? And secure as can be…

Your job is to prove us wrong and trigger a crash providing malicious input that is not filtered by the program.

If you think you found it, you may test your input on this page below, at the Solution field.

#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cassert>

int main(int argc, char* argv[]) {
assert(argc == 3);
char name[64];
int len;
len = atoi(argv[2]);
assert(len < 64);
memcpy(name, argv[1], len);
name[len] = ‘’;
std::cout << “Hello ” << name << “, nice to meet you!” << std::endl;
return 0;

#include #include #include #include <iostream> <cstdlib <cstring> <cassert > Arguments Arguments int main(int argc, char* argv[i) t assert (argc3); char name [64] int len len-atoi (argv[2]); assert(len < 64); memcpy (name, argv[1], len); name[1en]; std::cout <<Hello << name<<, nice to meet yo Run Two arguments required! u! << std: :endl; return e;What 2 arguments can prove us wrong and trigger a crash providing malicious input that is not filtered by the program?

#include #include #include #include

Expert Answer


/cygdrive/c/Users/a958905/Desktop/Test a958905@A958905-LTW7 /cygdrive/c/users/a958905/Desktop/Test $ ./a Arnald x23 Hello, nice to meet you! a958905@A958905-LTW7/cygdrive/c/Users/a958905/Desktop/Test S./a Arnald -5 a958905@A958905-LTW7 /cygdrive/c/Users/a958905/Desktop/Test

If you give negative length, that is not filtere by program, so the line:
name[len] = ‘’;

will crash.. Use second example to test.. Let me know in comments if any concerns.

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