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windows: prefer os version from registry

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this value is not modified by compatibility mode
drop reporting service pack numbers. no longer used
This commit is contained in:
Shawn Hoffman
2023-01-17 01:23:44 -08:00
parent 10fd768898
commit dff7f20f9d
7 changed files with 102 additions and 45 deletions
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72
Source/Core/Common/WindowsRegistry.cpp Normal file
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#include "Common/WindowsRegistry.h"
#include <Windows.h>
#include <string>
#include <type_traits>
#include "Common/StringUtil.h"
namespace WindowsRegistry
{
template <typename T>
bool ReadValue(T* value, const std::string& subkey, const std::string& name)
{
DWORD flags = 0;
static_assert(std::is_integral_v<T> && (sizeof(T) == sizeof(u32) || sizeof(T) == sizeof(u64)),
"Unsupported type");
if constexpr (sizeof(T) == sizeof(u32))
flags = RRF_RT_REG_DWORD;
else if constexpr (sizeof(T) == sizeof(u64))
flags = RRF_RT_REG_QWORD;
DWORD value_len = sizeof(*value);
return RegGetValueA(HKEY_LOCAL_MACHINE, subkey.c_str(), name.c_str(), flags, nullptr, value,
&value_len) == ERROR_SUCCESS;
}
template <>
bool ReadValue(std::string* value, const std::string& subkey, const std::string& name)
{
const DWORD flags = RRF_RT_REG_SZ | RRF_NOEXPAND;
DWORD value_len = 0;
auto status = RegGetValueA(HKEY_LOCAL_MACHINE, subkey.c_str(), name.c_str(), flags, nullptr,
nullptr, &value_len);
if (status != ERROR_SUCCESS && status != ERROR_MORE_DATA)
return false;
value->resize(value_len);
status = RegGetValueA(HKEY_LOCAL_MACHINE, subkey.c_str(), name.c_str(), flags, nullptr,
value->data(), &value_len);
if (status != ERROR_SUCCESS)
{
value->clear();
return false;
}
TruncateToCString(value);
return true;
}
OSVERSIONINFOW GetOSVersion()
{
// PEB may have faked data if the binary is launched with "compatibility mode" enabled.
// Try to read real OS version from registry.
const char* subkey = R"(SOFTWARE\Microsoft\Windows NT\CurrentVersion)";
OSVERSIONINFOW info{.dwOSVersionInfoSize = sizeof(info)};
std::string build_str;
if (!ReadValue(&info.dwMajorVersion, subkey, "CurrentMajorVersionNumber") ||
!ReadValue(&info.dwMinorVersion, subkey, "CurrentMinorVersionNumber") ||
!ReadValue(&build_str, subkey, "CurrentBuildNumber") ||
!TryParse(build_str, &info.dwBuildNumber))
{
// Fallback to version from PEB
typedef DWORD(WINAPI * RtlGetVersion_t)(PRTL_OSVERSIONINFOW);
auto RtlGetVersion =
(RtlGetVersion_t)GetProcAddress(GetModuleHandle(TEXT("ntdll")), "RtlGetVersion");
RtlGetVersion(&info);
// Clear fields which would not be filled in by registry query
info.dwPlatformId = 0;
info.szCSDVersion[0] = L'\0';
}
return info;
}
}; // namespace WindowsRegistry