Trying to overflow argc

main.c

#include <stdio.h>

int main(int argc, char **argv)
{
    printf("argc              : %d\n", argc);
    printf("sizeof(argc)      : %zu\n", sizeof(argc));
    printf("argv[argc] == NULL: %s\n", argv[argc] == NULL ? "True" : "False");

    return 0;
}

makefile

CC=gcc
CFLAGS=-Wall -Werror -pedantic -std=c99

all:
	$(CC) $(CFLAGS) main.c -o main

test.py

#!/usr/bin/env python

import subprocess

subprocess.call(["./main"] + ["f"]*(2**32))