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Handle WOW64 registry virtualization

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Pat Hartl 2026-03-30 19:07:36 -05:00
parent 2d1bdf1446
commit 01d155b1eb
1 changed files with 40 additions and 2 deletions
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42
LANCommander.Interposer/dll/src/registry.cpp
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@ -88,6 +88,44 @@ static std::wstring ToUpper(std::wstring s)
return s;
}
// Translate WOW64 UAC registry virtualization paths back to their canonical locations.
// HKEY_CURRENT_USER\SOFTWARE\CLASSES\VIRTUALSTORE\MACHINE\<X> -> HKEY_LOCAL_MACHINE\<X>
// HKEY_USERS\<SID>\SOFTWARE\CLASSES\VIRTUALSTORE\MACHINE\<X> -> HKEY_LOCAL_MACHINE\<X>
// Input must already be uppercased (as returned by ToUpper / BuildPath).
static std::wstring NormalizeVirtualStore(std::wstring path)
{
// HKEY_CURRENT_USER variant
{
static const wchar_t kPrefix[] =
L"HKEY_CURRENT_USER\\SOFTWARE\\CLASSES\\VIRTUALSTORE\\MACHINE\\";
const size_t kPrefixLen = ARRAYSIZE(kPrefix) - 1;
if (path.size() > kPrefixLen && path.compare(0, kPrefixLen, kPrefix) == 0)
return L"HKEY_LOCAL_MACHINE\\" + path.substr(kPrefixLen);
}
// HKEY_USERS\<SID>\... variant
{
static const wchar_t kHU[] = L"HKEY_USERS\\";
static const wchar_t kVSM[] = L"\\SOFTWARE\\CLASSES\\VIRTUALSTORE\\MACHINE\\";
const size_t kHULen = ARRAYSIZE(kHU) - 1;
const size_t kVSMLen = ARRAYSIZE(kVSM) - 1;
if (path.size() > kHULen + kVSMLen &&
path.compare(0, kHULen, kHU) == 0)
{
size_t sidEnd = path.find(L'\\', kHULen);
if (sidEnd != std::wstring::npos &&
path.size() > sidEnd + kVSMLen &&
path.compare(sidEnd, kVSMLen, kVSM) == 0)
{
return L"HKEY_LOCAL_MACHINE\\" + path.substr(sidEnd + kVSMLen);
}
}
}
return path;
}
// Returns the full uppercase path from base hKey + optional subkey.
// Returns "" if hKey is an unrecognised real OS handle.
static std::wstring BuildPath(HKEY hKey, LPCWSTR lpSubKey)
@ -126,7 +164,7 @@ static std::wstring BuildPath(HKEY hKey, LPCWSTR lpSubKey)
base += lpSubKey;
}
return ToUpper(base);
return NormalizeVirtualStore(ToUpper(base));
}
// Ask the OS for the full path of any open HKEY via NtQueryKey, then convert
@ -204,7 +242,7 @@ static std::wstring GetAnyPathFull(HKEY h)
}
if (const wchar_t* name = PredefinedName(h))
return ToUpper(name);
return GetKeyPathViaSystem(h);
return NormalizeVirtualStore(GetKeyPathViaSystem(h));
}
// True if upperPath exactly matches, or is an ancestor/descendant of any stored key.