overflow_example.c

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

int main(int argc, char *argv[]) {
	int value = 5;
	char buffer_one[8], buffer_two[8];

	if (argc == 1)
		return (0);

	strcpy(buffer_one, "one"); /* Put "one" into buffer_one. */
	strcpy(buffer_two, "two"); /* Put "two" into buffer_two. */

	printf("[BEFORE] buffer_twщ is at %p and contains \'%s\'\n",             buffer_two, buffer_two);
	printf("[BEFORE] buffer_one is at %p and contains \'%s\'\n",             buffer_one, buffer_one);
	printf("[BEFORE] value is at %p and is % d(0x %08x)\n",            &value, value, value);

	printf("\n[STRCPY] copying %lu bytes into buffer_two\n\n",            strlen(argv[1]));
	strcpy(buffer_two, argv[1]); /* Copy first argument into buffer_two. */

	printf("[AFTER] buffer_two is at %p and contains \'%s\'\n",            buffer_two, buffer_two);
	printf("[AFTER] buffer_one is at %p and contains \'%s\'\n",            buffer_one, buffer_one);
	printf("[AFTER] value is at %p and is % d(0x %08x)\n",            &value, value, value);
}