Testing Binjitsu with Return to libc

vuln_test.c

/*
 * Compile the binary as root
 * $ chmod +s vuln
 */
#include<stdio.h>
#include<unistd.h>
void c();

void c(char *arg)
{
    char buggy[512];
    printf("Address of a(): %p\n", a);
    printf("uid is:%u\teuid is:%u\n",getuid(),geteuid());
    strcpy(buggy,arg);
    puts(buggy);
}

int main(int argc, char **argv)
{
    c(argv[1]);
    return 0;
}