Test for Total Meltdown vulnerability

totalmeltdowntest.c

// Tests if a Windows 7 or Windows Server 2008 machine is vulnerable
// to the privilege escalation bug "Total Meltdown" described in
//     http://blog.frizk.net/2018/03/total-meltdown.html

#include "stdafx.h"

int main() {
	unsigned long long *p = (unsigned long long*)0xfffff6fb7dbedf68;
	printf("Reading PML4E entry. If this causes a crash, you're safe.\n");
	if (*p & 4)
		printf("Value at address %p is %llx whose third bit is set. You're vulnerable.\n", p, *p);
	else
		printf("Value at address %p is %llx whose third bit is not set. You're safe.\n", p, *p);
	return 0;
}