From f19f813537c7aea1c20749c914e756b54a9c3cf5 Mon Sep 17 00:00:00 2001
From: Igor Pavlov <87184205+ip7z@users.noreply.github.com>
Date: Mon, 27 Dec 2021 00:00:00 +0000
Subject: '21.07'

---
 CPP/Windows/MemoryLock.cpp | 112 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 CPP/Windows/MemoryLock.cpp

(limited to 'CPP/Windows/MemoryLock.cpp')

diff --git a/CPP/Windows/MemoryLock.cpp b/CPP/Windows/MemoryLock.cpp
new file mode 100644
index 0000000..fdfbeb9
--- /dev/null
+++ b/CPP/Windows/MemoryLock.cpp
@@ -0,0 +1,112 @@
+// Windows/MemoryLock.cpp
+
+#include "StdAfx.h"
+
+#include "../../C/CpuArch.h"
+
+#include "MemoryLock.h"
+
+namespace NWindows {
+namespace NSecurity {
+
+#ifndef UNDER_CE
+
+#ifdef _UNICODE
+#define MY_FUNC_SELECT(f) :: f
+#else
+#define MY_FUNC_SELECT(f) my_ ## f
+extern "C" {
+typedef BOOL (WINAPI * Func_OpenProcessToken)(HANDLE ProcessHandle, DWORD DesiredAccess, PHANDLE TokenHandle);
+typedef BOOL (WINAPI * Func_LookupPrivilegeValue)(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid);
+typedef BOOL (WINAPI * Func_AdjustTokenPrivileges)(HANDLE TokenHandle, BOOL DisableAllPrivileges,
+    PTOKEN_PRIVILEGES NewState, DWORD BufferLength, PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength);
+}
+#define GET_PROC_ADDR(fff, name) Func_ ## fff  my_ ## fff  = (Func_ ## fff)GetProcAddress(hModule, name)
+#endif
+
+bool EnablePrivilege(LPCTSTR privilegeName, bool enable)
+{
+  bool res = false;
+
+  #ifndef _UNICODE
+
+  HMODULE hModule = ::LoadLibrary(TEXT("Advapi32.dll"));
+  if (hModule == NULL)
+    return false;
+  
+  GET_PROC_ADDR(OpenProcessToken, "OpenProcessToken");
+  GET_PROC_ADDR(LookupPrivilegeValue, "LookupPrivilegeValueA");
+  GET_PROC_ADDR(AdjustTokenPrivileges, "AdjustTokenPrivileges");
+  
+  if (my_OpenProcessToken &&
+      my_AdjustTokenPrivileges &&
+      my_LookupPrivilegeValue)
+  
+  #endif
+
+  {
+    HANDLE token;
+    if (MY_FUNC_SELECT(OpenProcessToken)(::GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &token))
+    {
+      TOKEN_PRIVILEGES tp;
+      if (MY_FUNC_SELECT(LookupPrivilegeValue)(NULL, privilegeName, &(tp.Privileges[0].Luid)))
+      {
+        tp.PrivilegeCount = 1;
+        tp.Privileges[0].Attributes = (enable ? SE_PRIVILEGE_ENABLED : 0);
+        if (MY_FUNC_SELECT(AdjustTokenPrivileges)(token, FALSE, &tp, 0, NULL, NULL))
+          res = (GetLastError() == ERROR_SUCCESS);
+      }
+      ::CloseHandle(token);
+    }
+  }
+    
+  #ifndef _UNICODE
+
+  ::FreeLibrary(hModule);
+  
+  #endif
+
+  return res;
+}
+
+
+
+typedef void (WINAPI * Func_RtlGetVersion) (OSVERSIONINFOEXW *);
+
+/*
+  We suppose that Window 10 works incorrectly with "Large Pages" at:
+    - Windows 10 1703 (15063) : incorrect allocating after VirtualFree()
+    - Windows 10 1709 (16299) : incorrect allocating after VirtualFree()
+    - Windows 10 1809 (17763) : the failures for blocks of 1 GiB and larger,
+                                if CPU doesn't support 1 GB pages.
+  Windows 10 1903 (18362) probably works correctly.
+*/
+
+unsigned Get_LargePages_RiskLevel()
+{
+  OSVERSIONINFOEXW vi;
+  HMODULE ntdll = ::GetModuleHandleW(L"ntdll.dll");
+  if (!ntdll)
+    return 0;
+  Func_RtlGetVersion func = (Func_RtlGetVersion)(void *)GetProcAddress(ntdll, "RtlGetVersion");
+  if (!func)
+    return 0;
+  func(&vi);
+  if (vi.dwPlatformId != VER_PLATFORM_WIN32_NT)
+    return 0;
+  if (vi.dwMajorVersion + vi.dwMinorVersion != 10)
+    return 0;
+  if (vi.dwBuildNumber <= 16299)
+    return 1;
+
+  #ifdef MY_CPU_X86_OR_AMD64
+  if (vi.dwBuildNumber < 18362 && !CPU_IsSupported_PageGB())
+    return 1;
+  #endif
+
+  return 0;
+}
+
+#endif
+
+}}
-- 
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