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maliciousgroup/stack-one.c Secret

Created Apr 20, 2021
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/*
* phoenix/stack-one, by https://exploit.education
*
* The aim is to change the contents of the changeme variable to 0x496c5962
*
* Did you hear about the kid napping at the local school?
* It's okay, they woke up.
*
*/
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define BANNER \
"Welcome to " LEVELNAME ", brought to you by https://exploit.education"
int main(int argc, char **argv) {
struct {
char buffer[64];
volatile int changeme;
} locals;
printf("%s\n", BANNER);
if (argc < 2) {
errx(1, "specify an argument, to be copied into the \"buffer\"");
}
locals.changeme = 0;
strcpy(locals.buffer, argv[1]);
if (locals.changeme == 0x496c5962) {
puts("Well done, you have successfully set changeme to the correct value");
} else {
printf("Getting closer! changeme is currently 0x%08x, we want 0x496c5962\n",
locals.changeme);
}
exit(0);
}
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