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[idd] helper: run interactive process as desktop user

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Explorer file copies were invisible to the Helper because the service
launched its child with a duplicate of the LocalSystem token and changed
only TokenSessionId. The child therefore remained a System-integrity
process. Windows filtered Explorer's file clipboard formats across that
integrity boundary. Basic text and bitmap formats continued to work.

Keep only the SCM service privileged. Obtain the active session user's
primary token with WTSQueryUserToken. For elevated accounts, prefer the
linked limited token. Validate its session and security properties.
Build the user environment and launch the interactive Helper on
WinSta0\Default. Gate Helper activation until the service has rechecked
the active session and registered the clipboard authority.

Use random lifetime, stop, and activation objects owned by the service.
Give the target logon SID synchronization access only. Recheck the
active console session and service state before activation. Make the
lifetime mutex terminate the Helper if the service exits unexpectedly.
Restart it when the active session, IDD host, or authority changes.

Replace the old process-handle mapping transfer with a device-bound
authority protocol on the LGIdd device interface. The service verifies
the exact driver host instance, duplicates only section map rights into
that process, and registers the session, mapping identifier, and handle.
Bind authority lifetime to its WDF file object, revoke it synchronously
on cleanup, and poll the driver host identity while the child is active.

Restrict the device stack to SYSTEM and isolate LGIdd in a unique UMDF
device group. Restrict the shared section to SYSTEM and the target logon
SID. Apply a medium mandatory label that prevents low-integrity readers
and writers. Map it with read/write rights instead of all access.

Give each clipboard mapping a second random authority identifier. Store
it only inside the logon-SID-protected mapping and send it in the
mandatory HELLO. LGIdd matches it against the service-injected mapping.
This authenticates the user Helper without the unsupported UMDF call to
GetNamedPipeClientSessionId. Have the Helper verify that its pipe server
is in session zero.

Extend the pipe endpoint with bounded authentication reads, cancellable
overlapped I/O, periodic authorization checks, and explicit disconnects.
Serialize authority changes with clipboard attach and detach. Prevent
stale cleanup from tearing down a replacement mapping. Disconnect the
user pipe immediately when its owning authority is revoked.

Run clipboard, OLE, display, configuration, and file access in the
user's interactive process. Retain its process token for worker-thread
file operations instead of querying and impersonating the desktop user
from a System process. Store Helper logs in LocalAppData and grant only
the registry rights needed by interactive configuration and UMDF.

Keep immediate, stage-specific Win32 and HRESULT diagnostics throughout
clipboard capture. Probe CF_HDROP while holding the Win32 clipboard and
enumerate the OLE object's advertised file formats. Validate returned
storage and fall back to Shell item paths when direct retrieval fails.
Validate clipboard sequence changes and defer retries during contention
without publishing incomplete clipboard state.

Complete the 1 MiB transfer work with full-sized Windows copy buffers.
Use full-sized FUSE reads and retain the named 64 KiB X11 chunk limit.
Validate the user-writable mapping with CClipboardRing before attaching.

The pipe, mapping, and authority protocols change together. LGIdd.dll,
the INF, and LGIddHelper.exe must be rebuilt and installed as one
matching set.
This commit is contained in:
Geoffrey McRae
2026-08-15 00:11:01 +10:00
parent e40dc19c7e
commit f9ffce528a
35 changed files with 2803 additions and 665 deletions
Download Patch File Download Diff File Expand all files Collapse all files

352
idd/LGIddHelper/CClipboardManager.cpp
View File

@@ -79,12 +79,6 @@ namespace
~ComScope() { if (initialized) CoUninitialize(); }
};
struct ClipboardDataObjectScope
{
IDataObject * object = nullptr;
~ClipboardDataObjectScope() { if (object) object->Release(); }
};
struct ClipboardStorageScope
{
STGMEDIUM medium = {};
@@ -106,7 +100,14 @@ namespace
~ClipboardTaskStringScope() { CoTaskMemFree(value); }
};
bool ClipboardDataObjectHasFileFormats(IDataObject * object,
enum ClipboardFileCandidate : uint32_t
{
CLIPBOARD_FILE_CANDIDATE_NONE = 0,
CLIPBOARD_FILE_CANDIDATE_HDROP = 1U << 0,
CLIPBOARD_FILE_CANDIDATE_SHELL = 1U << 1,
};
uint32_t ClipboardDataObjectFileCandidates(IDataObject * object,
DWORD sequence, HRESULT& enumError)
{
enumError = E_INVALIDARG;
@@ -116,7 +117,7 @@ namespace
"Failed to inspect local clipboard file formats: "
"stage=IDataObject sequence=%lu",
static_cast<unsigned long>(sequence));
return false;
return CLIPBOARD_FILE_CANDIDATE_NONE;
}
ClipboardComScope<IEnumFORMATETC> formats;
@@ -129,15 +130,17 @@ namespace
"Failed to inspect local clipboard file formats: "
"stage=IDataObject::EnumFormatEtc sequence=%lu",
static_cast<unsigned long>(sequence));
return false;
return CLIPBOARD_FILE_CANDIDATE_NONE;
}
HRESULT registrationError = S_OK;
const UINT shellIDList = RegisterClipboardFormatW(CFSTR_SHELLIDLIST);
if (!shellIDList)
{
const DWORD formatError = GetLastError();
DEBUG_ERROR_HR(formatError ? HRESULT_FROM_WIN32(formatError) :
E_UNEXPECTED,
registrationError = formatError ? HRESULT_FROM_WIN32(formatError) :
E_UNEXPECTED;
DEBUG_ERROR_HR(registrationError,
"Failed to inspect local clipboard file formats: "
"stage=RegisterClipboardFormatW(CFSTR_SHELLIDLIST) sequence=%lu",
static_cast<unsigned long>(sequence));
@@ -147,39 +150,44 @@ namespace
if (!fileDescriptor)
{
const DWORD formatError = GetLastError();
DEBUG_ERROR_HR(formatError ? HRESULT_FROM_WIN32(formatError) :
E_UNEXPECTED,
const HRESULT formatHRESULT = formatError ?
HRESULT_FROM_WIN32(formatError) : E_UNEXPECTED;
if (SUCCEEDED(registrationError))
registrationError = formatHRESULT;
DEBUG_ERROR_HR(formatHRESULT,
"Failed to inspect local clipboard file formats: "
"stage=RegisterClipboardFormatW(CFSTR_FILEDESCRIPTORW) sequence=%lu",
static_cast<unsigned long>(sequence));
}
uint32_t candidates = CLIPBOARD_FILE_CANDIDATE_NONE;
for (;;)
{
FORMATETC format = {};
ULONG fetched = 0;
enumError = formats.object->Next(1, &format, &fetched);
const bool files = fetched == 1U &&
(format.cfFormat == CF_HDROP ||
(shellIDList && format.cfFormat == shellIDList) ||
(fileDescriptor && format.cfFormat == fileDescriptor));
CoTaskMemFree(format.ptd);
if (files)
{
enumError = S_OK;
return true;
}
if (enumError == S_FALSE)
{
enumError = S_OK;
return false;
}
if (FAILED(enumError))
{
DEBUG_ERROR_HR(enumError,
"Failed to inspect local clipboard file formats: "
"stage=IEnumFORMATETC::Next sequence=%lu",
static_cast<unsigned long>(sequence));
return false;
CoTaskMemFree(format.ptd);
return candidates;
}
if (fetched == 1U)
{
if (format.cfFormat == CF_HDROP)
candidates |= CLIPBOARD_FILE_CANDIDATE_HDROP;
if ((shellIDList && format.cfFormat == shellIDList) ||
(fileDescriptor && format.cfFormat == fileDescriptor))
candidates |= CLIPBOARD_FILE_CANDIDATE_SHELL;
}
CoTaskMemFree(format.ptd);
if (enumError == S_FALSE)
{
enumError = registrationError;
return candidates;
}
if (!fetched)
{
@@ -188,11 +196,40 @@ namespace
"Failed to inspect local clipboard file formats: "
"stage=IEnumFORMATETC::Next sequence=%lu fetched=0",
static_cast<unsigned long>(sequence));
return false;
return candidates;
}
}
}
int CountClipboardFormatsLogged(const char * stage, DWORD sequence)
{
SetLastError(ERROR_SUCCESS);
const int count = CountClipboardFormats();
if (count)
return count;
const DWORD error = GetLastError();
if (error)
DEBUG_ERROR_HR(HRESULT_FROM_WIN32(error),
"Failed to count clipboard formats: stage=%s sequence=%lu",
stage, static_cast<unsigned long>(sequence));
return 0;
}
void FreeClipboardDrop(HGLOBAL memory, DWORD sequence)
{
SetLastError(ERROR_SUCCESS);
const HGLOBAL result = GlobalFree(memory);
if (!result)
return;
const DWORD error = GetLastError();
DEBUG_ERROR_HR(error ? HRESULT_FROM_WIN32(error) : E_UNEXPECTED,
"Failed to capture local clipboard files: "
"stage=GlobalFree(DROPFILES) sequence=%lu",
static_cast<unsigned long>(sequence));
}
HRESULT ClipboardFileHRESULT(KVMFRClipboardFileError error)
{
switch (error)
@@ -3281,32 +3318,24 @@ void CClipboardManager::HandleFileDataObject(UIWork& work)
m_ownedSequence = GetClipboardSequenceNumber();
}
bool CClipboardManager::OpenClipboardRetry(DWORD * error,
const char * stage, bool useWindow) const
HRESULT CClipboardManager::OpenClipboardRetry(const char * stage) const
{
HRESULT result = CLIPBRD_E_CANT_OPEN;
for (unsigned int attempt = 0; attempt != 8; ++attempt)
{
if (OpenClipboard(useWindow ? m_hwnd : nullptr))
{
if (error)
*error = ERROR_SUCCESS;
return true;
}
if (OpenClipboard(m_hwnd))
return S_OK;
const DWORD openError = GetLastError();
DEBUG_ERROR_HR(openError ? HRESULT_FROM_WIN32(openError) :
CLIPBRD_E_CANT_OPEN,
result = openError ? HRESULT_FROM_WIN32(openError) :
CLIPBRD_E_CANT_OPEN;
DEBUG_ERROR_HR(result,
"OpenClipboard failed: stage=%s attempt=%u",
stage ? stage : "unspecified", attempt + 1U);
stage, attempt + 1U);
if (attempt + 1U == 8U)
{
if (error)
*error = openError;
SetLastError(openError);
return false;
}
return result;
Sleep(5U << (std::min)(attempt, 5U));
}
return false;
return result;
}
bool CClipboardManager::IsOurClipboard()
@@ -3323,7 +3352,8 @@ bool CClipboardManager::IsOurClipboard()
}
if (!m_formatOrigin || !m_remoteGeneration ||
!IsClipboardFormatAvailable(m_formatOrigin) || !OpenClipboardRetry())
!IsClipboardFormatAvailable(m_formatOrigin) ||
FAILED(OpenClipboardRetry("IsOurClipboard")))
return false;
bool ours = false;
@@ -3383,26 +3413,10 @@ CClipboardManager::CaptureClipboardFiles(DWORD sequence, int rawFormatCount,
return nullptr;
}
CClipboardUserImpersonation user(error);
if (!user.Active())
{
const DWORD userError = user.Error();
oleError = userError ? HRESULT_FROM_WIN32(userError) :
ClipboardFileHRESULT(error);
DEBUG_ERROR_HR(oleError,
"Failed to capture local clipboard files: "
"stage=impersonate-interactive-user sequence=%lu rawFormats=%d "
"fileError=%u", static_cast<unsigned long>(sequence),
rawFormatCount, static_cast<unsigned int>(error));
return nullptr;
}
// Acquire the clipboard before probing CF_HDROP. Explorer can still hold
// the clipboard when WM_CLIPBOARDUPDATE is delivered, in which case an
// unlocked IsClipboardFormatAvailable probe can observe no formats.
DWORD openError = ERROR_SUCCESS;
if (!OpenClipboardRetry(&openError, "CaptureClipboardFiles(CF_HDROP)",
false))
if (FAILED(OpenClipboardRetry("CaptureClipboardFiles(CF_HDROP)")))
{
oleError = CLIPBRD_E_CANT_OPEN;
retryStage = "OpenClipboard";
@@ -3415,7 +3429,8 @@ CClipboardManager::CaptureClipboardFiles(DWORD sequence, int rawFormatCount,
int openedRawFormatCount = 0;
if (GetClipboardSequenceNumber() == sequence)
{
openedRawFormatCount = CountClipboardFormats();
openedRawFormatCount = CountClipboardFormatsLogged(
"CaptureClipboardFiles(CF_HDROP)", sequence);
win32Candidate = IsClipboardFormatAvailable(CF_HDROP) != FALSE;
if (win32Candidate)
{
@@ -3463,14 +3478,19 @@ CClipboardManager::CaptureClipboardFiles(DWORD sequence, int rawFormatCount,
static_cast<unsigned long>(GetClipboardSequenceNumber()));
}
if (!CloseClipboard())
const BOOL closed = CloseClipboard();
if (!closed)
{
const DWORD closeError = GetLastError();
DEBUG_ERROR_HR(closeError ? HRESULT_FROM_WIN32(closeError) :
CLIPBRD_E_CANT_CLOSE,
oleError = closeError ? HRESULT_FROM_WIN32(closeError) :
CLIPBRD_E_CANT_CLOSE;
error = closeError == ERROR_ACCESS_DENIED ?
KVMFR_CLIPBOARD_FILE_ERROR_ACCESS : KVMFR_CLIPBOARD_FILE_ERROR_IO;
DEBUG_ERROR_HR(oleError,
"Failed to capture local clipboard files: stage=CloseClipboard "
"sequence=%lu rawFormats=%d",
static_cast<unsigned long>(sequence), rawFormatCount);
return nullptr;
}
if (files)
return files;
@@ -3488,7 +3508,7 @@ CClipboardManager::CaptureClipboardFiles(DWORD sequence, int rawFormatCount,
return nullptr;
}
ClipboardDataObjectScope object;
ClipboardComScope<IDataObject> object;
oleError = OleGetClipboard(&object.object);
if (FAILED(oleError) || !object.object)
{
@@ -3503,66 +3523,94 @@ CClipboardManager::CaptureClipboardFiles(DWORD sequence, int rawFormatCount,
return nullptr;
}
FORMATETC format = {
static_cast<CLIPFORMAT>(CF_HDROP),
nullptr,
DVASPECT_CONTENT,
-1,
TYMED_HGLOBAL,
};
ClipboardStorageScope storage;
const HRESULT hdropError = object.object->GetData(
&format, &storage.medium);
if (FAILED(hdropError))
HRESULT candidateError = S_OK;
const uint32_t candidates = ClipboardDataObjectFileCandidates(
object.object, sequence, candidateError);
const bool optimistic = FAILED(candidateError);
if (!optimistic && !win32Candidate &&
candidates == CLIPBOARD_FILE_CANDIDATE_NONE)
{
DEBUG_ERROR_HR(hdropError,
"Failed to capture local clipboard files: "
"stage=IDataObject::GetData(CF_HDROP) sequence=%lu rawFormats=%d",
static_cast<unsigned long>(sequence), rawFormatCount);
}
if (hdropError == CLIPBRD_E_CANT_OPEN)
{
oleError = hdropError;
retryStage = "IDataObject::GetData(CF_HDROP)";
error = KVMFR_CLIPBOARD_FILE_ERROR_NONE;
oleError = S_FALSE;
return nullptr;
}
if (SUCCEEDED(hdropError))
HRESULT hdropError = S_FALSE;
bool hdropAttempted = false;
if (optimistic || win32Candidate ||
(candidates & CLIPBOARD_FILE_CANDIDATE_HDROP))
{
storage.acquired = true;
if (storage.medium.tymed == TYMED_HGLOBAL && storage.medium.hGlobal)
hdropAttempted = true;
FORMATETC format = {
static_cast<CLIPFORMAT>(CF_HDROP),
nullptr,
DVASPECT_CONTENT,
-1,
TYMED_HGLOBAL,
};
ClipboardStorageScope storage;
hdropError = object.object->GetData(&format, &storage.medium);
if (FAILED(hdropError))
{
std::shared_ptr<CLocalClipboardFiles> files =
CLocalClipboardFiles::Capture(
static_cast<HDROP>(storage.medium.hGlobal), error);
if (files)
{
viaOLE = true;
oleError = S_OK;
return files;
}
oleError = ClipboardFileHRESULT(error);
DEBUG_ERROR_HR(oleError,
DEBUG_ERROR_HR(hdropError,
"Failed to capture local clipboard files: "
"stage=CLocalClipboardFiles::Capture(CF_HDROP/ole) sequence=%lu "
"rawFormats=%d fileError=%u",
static_cast<unsigned long>(sequence), rawFormatCount,
static_cast<unsigned int>(error));
return nullptr;
"stage=IDataObject::GetData(CF_HDROP) sequence=%lu rawFormats=%d",
static_cast<unsigned long>(sequence), rawFormatCount);
if (hdropError == CLIPBRD_E_CANT_OPEN)
{
oleError = hdropError;
retryStage = "IDataObject::GetData(CF_HDROP)";
return nullptr;
}
}
else
{
storage.acquired = true;
if (storage.medium.tymed != TYMED_HGLOBAL ||
!storage.medium.hGlobal)
{
oleError = DV_E_TYMED;
error = KVMFR_CLIPBOARD_FILE_ERROR_INVALID;
DEBUG_ERROR_HR(oleError,
"Failed to capture local clipboard files: "
"stage=IDataObject::GetData(CF_HDROP)/STGMEDIUM sequence=%lu "
"rawFormats=%d tymed=0x%08lx hasHGlobal=%u",
static_cast<unsigned long>(sequence), rawFormatCount,
static_cast<unsigned long>(storage.medium.tymed),
storage.medium.hGlobal ? 1U : 0U);
return nullptr;
}
files = CLocalClipboardFiles::Capture(
static_cast<HDROP>(storage.medium.hGlobal), error);
if (!files)
{
oleError = ClipboardFileHRESULT(error);
DEBUG_ERROR_HR(oleError,
"Failed to capture local clipboard files: "
"stage=CLocalClipboardFiles::Capture(CF_HDROP/ole) sequence=%lu "
"rawFormats=%d fileError=%u",
static_cast<unsigned long>(sequence), rawFormatCount,
static_cast<unsigned int>(error));
return nullptr;
}
viaOLE = true;
oleError = S_OK;
return files;
}
}
if (SUCCEEDED(hdropError))
if (!optimistic &&
!(candidates & CLIPBOARD_FILE_CANDIDATE_SHELL))
{
oleError = DV_E_TYMED;
error = KVMFR_CLIPBOARD_FILE_ERROR_INVALID;
DEBUG_ERROR_HR(oleError,
"Failed to capture local clipboard files: "
"stage=IDataObject::GetData(CF_HDROP)/STGMEDIUM sequence=%lu "
"rawFormats=%d tymed=0x%08lx hasHGlobal=%u",
static_cast<unsigned long>(sequence), rawFormatCount,
static_cast<unsigned long>(storage.medium.tymed),
storage.medium.hGlobal ? 1U : 0U);
if (hdropAttempted)
oleError = hdropError;
else
{
error = KVMFR_CLIPBOARD_FILE_ERROR_NONE;
oleError = S_FALSE;
}
return nullptr;
}
@@ -3589,17 +3637,6 @@ CClipboardManager::CaptureClipboardFiles(DWORD sequence, int rawFormatCount,
oleError = FAILED(shellError) ? shellError : E_UNEXPECTED;
if (oleError == CLIPBRD_E_CANT_OPEN)
retryStage = "SHCreateShellItemArrayFromDataObject";
HRESULT enumError = S_OK;
const bool fileCandidate = win32Candidate ||
hdropError != DV_E_FORMATETC ||
ClipboardDataObjectHasFileFormats(object.object, sequence, enumError);
if (!fileCandidate && SUCCEEDED(enumError) &&
oleError != CLIPBRD_E_CANT_OPEN)
{
error = KVMFR_CLIPBOARD_FILE_ERROR_NONE;
oleError = S_FALSE;
return nullptr;
}
return nullptr;
}
@@ -3707,16 +3744,7 @@ CClipboardManager::CaptureClipboardFiles(DWORD sequence, int rawFormatCount,
DEBUG_ERROR_HR(oleError,
"Failed to capture local clipboard files: stage=GlobalLock(DROPFILES) "
"sequence=%lu", static_cast<unsigned long>(sequence));
SetLastError(ERROR_SUCCESS);
HGLOBAL freeResult = GlobalFree(drop);
if (freeResult)
{
const DWORD freeError = GetLastError();
DEBUG_ERROR_HR(freeError ? HRESULT_FROM_WIN32(freeError) : E_UNEXPECTED,
"Failed to capture local clipboard files: "
"stage=GlobalFree(DROPFILES) sequence=%lu",
static_cast<unsigned long>(sequence));
}
FreeClipboardDrop(drop, sequence);
return nullptr;
}
header->pFiles = sizeof(*header);
@@ -3733,10 +3761,15 @@ CClipboardManager::CaptureClipboardFiles(DWORD sequence, int rawFormatCount,
const DWORD unlockError = unlocked ? ERROR_SUCCESS : GetLastError();
if (!unlocked && unlockError != ERROR_SUCCESS)
{
DEBUG_ERROR_HR(HRESULT_FROM_WIN32(unlockError),
oleError = HRESULT_FROM_WIN32(unlockError);
error = unlockError == ERROR_ACCESS_DENIED ?
KVMFR_CLIPBOARD_FILE_ERROR_ACCESS : KVMFR_CLIPBOARD_FILE_ERROR_IO;
DEBUG_ERROR_HR(oleError,
"Failed to capture local clipboard files: "
"stage=GlobalUnlock(DROPFILES) sequence=%lu",
static_cast<unsigned long>(sequence));
FreeClipboardDrop(drop, sequence);
return nullptr;
}
files = CLocalClipboardFiles::Capture(static_cast<HDROP>(drop), error);
@@ -3749,16 +3782,7 @@ CClipboardManager::CaptureClipboardFiles(DWORD sequence, int rawFormatCount,
"fileError=%u", static_cast<unsigned long>(sequence),
static_cast<unsigned int>(error));
}
SetLastError(ERROR_SUCCESS);
HGLOBAL freeResult = GlobalFree(drop);
if (freeResult)
{
const DWORD freeError = GetLastError();
DEBUG_ERROR_HR(freeError ? HRESULT_FROM_WIN32(freeError) : E_UNEXPECTED,
"Failed to capture local clipboard files: "
"stage=GlobalFree(DROPFILES) sequence=%lu",
static_cast<unsigned long>(sequence));
}
FreeClipboardDrop(drop, sequence);
if (!files)
return nullptr;
viaOLE = true;
@@ -3829,7 +3853,8 @@ void CClipboardManager::PublishLocalClipboard()
const DWORD before = GetClipboardSequenceNumber();
uint32_t formats = EnumerateFormats();
const uint32_t recognizedFormats = formats;
const int rawFormatCount = CountClipboardFormats();
const int rawFormatCount = CountClipboardFormatsLogged(
"PublishLocalClipboard", before);
const DWORD after = GetClipboardSequenceNumber();
if (before != after)
{
@@ -4132,11 +4157,8 @@ bool CClipboardManager::ApplyRemoteOffer(uint32_t formats,
m_oleClipboard->Release();
m_oleClipboard = nullptr;
}
if (!OpenClipboardRetry())
{
DEBUG_WARN_HR(GetLastError(), "Failed to open the clipboard");
if (FAILED(OpenClipboardRetry("ApplyRemoteOffer")))
return false;
}
m_applyingRemote = true;
const bool emptied = EmptyClipboard() != FALSE;
@@ -4200,7 +4222,8 @@ bool CClipboardManager::ApplyRemoteOffer(uint32_t formats,
if (!error)
error = ERROR_INVALID_DATA;
SetLastError(error);
DEBUG_WARN_HR(error, "Failed to replace the clipboard");
DEBUG_WARN_HR(HRESULT_FROM_WIN32(error),
"Failed to replace the clipboard");
return false;
}
m_ownedSequence = GetClipboardSequenceNumber();
@@ -4217,7 +4240,8 @@ void CClipboardManager::ClearOwnedClipboard()
m_oleClipboard->Release();
m_oleClipboard = nullptr;
}
if (m_hwnd && GetClipboardOwner() == m_hwnd && OpenClipboardRetry())
if (m_hwnd && GetClipboardOwner() == m_hwnd &&
SUCCEEDED(OpenClipboardRetry("ClearOwnedClipboard")))
{
m_applyingRemote = true;
EmptyClipboard();
@@ -4271,8 +4295,14 @@ std::shared_ptr<CClipboardSpool> CClipboardManager::CaptureFormat(
SetLastError(ERROR_RETRY);
return nullptr;
}
if (!OpenClipboardRetry())
const HRESULT openResult = OpenClipboardRetry("CaptureFormat");
if (FAILED(openResult))
{
const DWORD openError = HRESULT_FACILITY(openResult) == FACILITY_WIN32 ?
static_cast<DWORD>(HRESULT_CODE(openResult)) : ERROR_BUSY;
SetLastError(openError);
return nullptr;
}
if (GetClipboardSequenceNumber() != sequence)
{
@@ -4576,7 +4606,7 @@ void CClipboardManager::RenderFormat(UINT windowsFormat, uint64_t deadline)
void CClipboardManager::RenderAllFormats()
{
if (!OpenClipboardRetry())
if (FAILED(OpenClipboardRetry("RenderAllFormats")))
return;
if (GetClipboardOwner() != m_hwnd)
{