This challenge is pretty much the same as the previous challenge, except that the buffer comes from an environmental variable.

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char **argv)
{
 volatile int modified;
 char …

This challenge is very similar to the previous one. The main difference is that instead of just validating that the “modified” value was changed, it validates that it was changed to a specific value, 0x61626364, or “dcba” in ASCII.

#include <stdlib.h>
#include …

I’m still working on the Nebula chain of challenges, however, I’ve been stuck on Nebula 11 for a bit now, as well as busy outside work.

In the meantime, I still have other challenges that can be solved while I learn how to do more advanced ones. Protostar is another challenge made by …