program2.c

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

void target(void) __attribute__ ((section (".attack")));

void target(void) {
        system("/bin/cat secret");
}

void vuln(char *arg) {
        char len = 0;
        char hello[108] = "Hello, ";
        len = strlen(arg);

        if (len > 100) {
                printf("Sorry, name too long !\n");
                exit(1);
        }

        strcat(hello, arg);
        printf("%s.\n",hello);

}

int main(int argc, char **argv) {

        setregid(getegid(), getegid());

        printf("Hint: %p\n", target);

        if (argc != 2) {
                printf("Usage: ./program2 <argument>\n");
                exit(2);
        }

        vuln(argv[1]);

        return 0;

}