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reactos/base/system/smss/smsubsys.c

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/*
* PROJECT: ReactOS Windows-Compatible Session Manager
* LICENSE: BSD 2-Clause License
* FILE: base/system/smss/smsubsys.c
* PURPOSE: Main SMSS Code
* PROGRAMMERS: Alex Ionescu
*/
/* INCLUDES *******************************************************************/
#include "smss.h"
#define NDEBUG
#include <debug.h>
/* GLOBALS ********************************************************************/
RTL_CRITICAL_SECTION SmpKnownSubSysLock;
LIST_ENTRY SmpKnownSubSysHead;
HANDLE SmpWindowsSubSysProcess;
HANDLE SmpWindowsSubSysProcessId;
BOOLEAN RegPosixSingleInstance;
WCHAR InitialCommandBuffer[256];
/* FUNCTIONS ******************************************************************/
NTSTATUS
NTAPI
SmpCallCsrCreateProcess(IN PSB_API_MSG SbApiMsg,
IN USHORT MessageLength,
IN HANDLE PortHandle)
{
NTSTATUS Status;
/* Initialize the header and send the message to CSRSS */
SbApiMsg->h.u2.ZeroInit = 0;
SbApiMsg->h.u1.s1.DataLength = MessageLength + 8;
SbApiMsg->h.u1.s1.TotalLength = sizeof(SB_API_MSG);
SbApiMsg->ApiNumber = SbpCreateProcess;
Status = NtRequestWaitReplyPort(PortHandle, &SbApiMsg->h, &SbApiMsg->h);
if (NT_SUCCESS(Status)) Status = SbApiMsg->ReturnValue;
return Status;
}
VOID
NTAPI
SmpDereferenceSubsystem(IN PSMP_SUBSYSTEM SubSystem)
{
/* Acquire the database lock while we (potentially) destroy this subsystem */
RtlEnterCriticalSection(&SmpKnownSubSysLock);
/* Drop the reference and see if it's terminating */
if (!(--SubSystem->ReferenceCount) && (SubSystem->Terminating))
{
/* Close all handles and free it */
if (SubSystem->Event) NtClose(SubSystem->Event);
if (SubSystem->ProcessHandle) NtClose(SubSystem->ProcessHandle);
if (SubSystem->SbApiPort) NtClose(SubSystem->SbApiPort);
RtlFreeHeap(SmpHeap, 0, SubSystem);
}
/* Release the database lock */
RtlLeaveCriticalSection(&SmpKnownSubSysLock);
}
PSMP_SUBSYSTEM
NTAPI
SmpLocateKnownSubSysByCid(IN PCLIENT_ID ClientId)
{
PSMP_SUBSYSTEM Subsystem = NULL;
PLIST_ENTRY NextEntry;
/* Lock the subsystem database */
RtlEnterCriticalSection(&SmpKnownSubSysLock);
/* Loop each subsystem in the database */
NextEntry = SmpKnownSubSysHead.Flink;
while (NextEntry != &SmpKnownSubSysHead)
{
/* Check if this one matches the client ID and is still valid */
Subsystem = CONTAINING_RECORD(NextEntry, SMP_SUBSYSTEM, Entry);
if ((*(PULONGLONG)&Subsystem->ClientId == *(PULONGLONG)ClientId) &&
!(Subsystem->Terminating))
{
/* Add a reference and return it */
Subsystem->ReferenceCount++;
break;
}
/* Reset the current pointer and keep earching */
Subsystem = NULL;
NextEntry = NextEntry->Flink;
}
/* Release the lock and return the subsystem we found */
RtlLeaveCriticalSection(&SmpKnownSubSysLock);
return Subsystem;
}
PSMP_SUBSYSTEM
NTAPI
SmpLocateKnownSubSysByType(IN ULONG MuSessionId,
IN ULONG ImageType)
{
PSMP_SUBSYSTEM Subsystem = NULL;
PLIST_ENTRY NextEntry;
/* Lock the subsystem database */
RtlEnterCriticalSection(&SmpKnownSubSysLock);
/* Loop each subsystem in the database */
NextEntry = SmpKnownSubSysHead.Flink;
while (NextEntry != &SmpKnownSubSysHead)
{
/* Check if this one matches the image and uID, and is still valid */
Subsystem = CONTAINING_RECORD(NextEntry, SMP_SUBSYSTEM, Entry);
if ((Subsystem->ImageType == ImageType) &&
!(Subsystem->Terminating) &&
(Subsystem->MuSessionId == MuSessionId))
{
/* Return it referenced for the caller */
Subsystem->ReferenceCount++;
break;
}
/* Reset the current pointer and keep earching */
Subsystem = NULL;
NextEntry = NextEntry->Flink;
}
/* Release the lock and return the subsystem we found */
RtlLeaveCriticalSection(&SmpKnownSubSysLock);
return Subsystem;
}
NTSTATUS
NTAPI
SmpLoadSubSystem(IN PUNICODE_STRING FileName,
IN PUNICODE_STRING Directory,
IN PUNICODE_STRING CommandLine,
IN ULONG MuSessionId,
OUT PHANDLE ProcessId,
IN ULONG Flags)
{
PSMP_SUBSYSTEM Subsystem, NewSubsystem, KnownSubsystem = NULL;
HANDLE SubSysProcessId;
NTSTATUS Status = STATUS_SUCCESS;
SB_API_MSG SbApiMsg, SbApiMsg2;
RTL_USER_PROCESS_INFORMATION ProcessInformation;
LARGE_INTEGER Timeout;
PVOID State;
PSB_CREATE_PROCESS_MSG CreateProcess = &SbApiMsg.CreateProcess;
PSB_CREATE_SESSION_MSG CreateSession = &SbApiMsg.CreateSession;
/* Make sure this is a found subsystem */
if (Flags & SMP_INVALID_PATH)
{
DPRINT1("SMSS: Unable to find subsystem - %wZ\n", FileName);
return STATUS_OBJECT_NAME_NOT_FOUND;
}
/* Don't use a session if the flag is set */
if (Flags & 0x80) MuSessionId = 0;
/* Lock the subsystems while we do a look up */
RtlEnterCriticalSection(&SmpKnownSubSysLock);
while (TRUE)
{
/* Check if we found a subsystem not yet fully initialized */
Subsystem = SmpLocateKnownSubSysByType(MuSessionId, -1);
if (!Subsystem) break;
RtlLeaveCriticalSection(&SmpKnownSubSysLock);
/* Wait on it to initialize */
NtWaitForSingleObject(Subsystem->Event, FALSE, NULL);
/* Dereference it and try the next one */
RtlEnterCriticalSection(&SmpKnownSubSysLock);
SmpDereferenceSubsystem(Subsystem);
}
/* Check if this is a POSIX subsystem */
if (Flags & SMP_POSIX_FLAG)
{
/* Do we already have it? */
Subsystem = SmpLocateKnownSubSysByType(MuSessionId, IMAGE_SUBSYSTEM_POSIX_CUI);
}
else if (Flags & SMP_OS2_FLAG)
{
/* This is an OS/2 subsystem, do we we already have it? */
Subsystem = SmpLocateKnownSubSysByType(MuSessionId, IMAGE_SUBSYSTEM_OS2_CUI);
}
/* Check if we already have one of the optional subsystems for the session */
if (Subsystem)
{
/* Dereference and return, no work to do */
SmpDereferenceSubsystem(Subsystem);
RtlLeaveCriticalSection(&SmpKnownSubSysLock);
return STATUS_SUCCESS;
}
/* Allocate a new subsystem! */
NewSubsystem = RtlAllocateHeap(SmpHeap, SmBaseTag, sizeof(SMP_SUBSYSTEM));
if (!NewSubsystem)
{
RtlLeaveCriticalSection(&SmpKnownSubSysLock);
return STATUS_NO_MEMORY;
}
/* Initialize its header and reference count */
NewSubsystem->ReferenceCount = 1;
NewSubsystem->MuSessionId = MuSessionId;
NewSubsystem->ImageType = -1;
/* Clear out all the other data for now */
NewSubsystem->Terminating = FALSE;
NewSubsystem->ProcessHandle = NULL;
NewSubsystem->Event = NULL;
NewSubsystem->PortHandle = NULL;
NewSubsystem->SbApiPort = NULL;
/* Create the event we'll be waiting on for initialization */
Status = NtCreateEvent(&NewSubsystem->Event,
EVENT_ALL_ACCESS,
NULL,
NotificationEvent,
FALSE);
if (!NT_SUCCESS(Status))
{
/* This failed, bail out */
RtlFreeHeap(SmpHeap, 0, NewSubsystem);
RtlLeaveCriticalSection(&SmpKnownSubSysLock);
return STATUS_NO_MEMORY;
}
/* Insert the subsystem and release the lock. It can now be found */
InsertTailList(&SmpKnownSubSysHead, &NewSubsystem->Entry);
RtlLeaveCriticalSection(&SmpKnownSubSysLock);
/* The OS/2 and POSIX subsystems are actually Windows applications! */
if (Flags & (SMP_POSIX_FLAG | SMP_OS2_FLAG))
{
/* Locate the Windows subsystem for this session */
KnownSubsystem = SmpLocateKnownSubSysByType(MuSessionId,
IMAGE_SUBSYSTEM_WINDOWS_GUI);
if (!KnownSubsystem)
{
DPRINT1("SMSS: SmpLoadSubSystem - SmpLocateKnownSubSysByType Failed\n");
goto Quickie2;
}
/* Fill out all the process details and call CSRSS to launch it */
CreateProcess->In.ImageName = FileName;
CreateProcess->In.CurrentDirectory = Directory;
CreateProcess->In.CommandLine = CommandLine;
CreateProcess->In.DllPath = SmpDefaultLibPath.Length ?
&SmpDefaultLibPath : NULL;
CreateProcess->In.Flags = Flags | SMP_DEFERRED_FLAG;
CreateProcess->In.DebugFlags = SmpDebug;
Status = SmpCallCsrCreateProcess(&SbApiMsg,
sizeof(*CreateProcess),
KnownSubsystem->SbApiPort);
if (!NT_SUCCESS(Status))
{
/* Handle failures */
DPRINT1("SMSS: SmpLoadSubSystem - SmpCallCsrCreateProcess Failed with Status %lx\n",
Status);
goto Quickie2;
}
/* Save the process information we'll need for the create session */
ProcessInformation.ProcessHandle = CreateProcess->Out.ProcessHandle;
ProcessInformation.ThreadHandle = CreateProcess->Out.ThreadHandle;
ProcessInformation.ClientId = CreateProcess->Out.ClientId;
ProcessInformation.ImageInformation.SubSystemType = CreateProcess->Out.SubsystemType;
}
else
{
/* This must be CSRSS itself, so just launch it and that's it */
Status = SmpExecuteImage(FileName,
Directory,
CommandLine,
MuSessionId,
Flags | SMP_DEFERRED_FLAG,
&ProcessInformation);
if (!NT_SUCCESS(Status))
{
/* Handle failures */
DPRINT1("SMSS: SmpLoadSubSystem - SmpExecuteImage Failed with Status %lx\n",
Status);
goto Quickie2;
}
}
/* Fill out the handle and client ID in the subsystem structure now */
NewSubsystem->ProcessHandle = ProcessInformation.ProcessHandle;
NewSubsystem->ClientId = ProcessInformation.ClientId;
/* Check if we launched a native image or a subsystem-backed image */
if (ProcessInformation.ImageInformation.SubSystemType == IMAGE_SUBSYSTEM_NATIVE)
{
/* This must be CSRSS itself, since it's a native subsystem image */
SubSysProcessId = ProcessInformation.ClientId.UniqueProcess;
if ((ProcessId) && !(*ProcessId)) *ProcessId = SubSysProcessId;
/* Was this the initial CSRSS on Session 0? */
if (!MuSessionId)
{
/* Then save it in the global variables */
SmpWindowsSubSysProcessId = SubSysProcessId;
SmpWindowsSubSysProcess = ProcessInformation.ProcessHandle;
}
ASSERT(NT_SUCCESS(Status));
}
else
{
/* This is the POSIX or OS/2 subsystem process, copy its information */
RtlCopyMemory(&CreateSession->ProcessInfo,
&ProcessInformation,
sizeof(CreateSession->ProcessInfo));
/* Not sure these field mean what I think they do -- but clear them */
*(PULONGLONG)&CreateSession->ClientId = 0;
CreateSession->MuSessionId = 0;
/* This should find CSRSS because they are POSIX or OS/2 subsystems */
Subsystem = SmpLocateKnownSubSysByType(MuSessionId,
ProcessInformation.ImageInformation.SubSystemType);
if (!Subsystem)
{
/* Odd failure -- but handle it anyway */
Status = STATUS_NO_SUCH_PACKAGE;
DPRINT1("SMSS: SmpLoadSubSystem - SmpLocateKnownSubSysByType Failed with Status %lx for sessionid %lu\n",
Status,
MuSessionId);
goto Quickie;
}
/* Duplicate the parent process handle for the subsystem to have */
Status = NtDuplicateObject(NtCurrentProcess(),
ProcessInformation.ProcessHandle,
Subsystem->ProcessHandle,
&CreateSession->ProcessInfo.ProcessHandle,
PROCESS_ALL_ACCESS,
0,
0);
if (!NT_SUCCESS(Status))
{
/* Fail since this is critical */
DPRINT1("SMSS: SmpLoadSubSystem - NtDuplicateObject Failed with Status %lx for sessionid %lu\n",
Status,
MuSessionId);
goto Quickie;
}
/* Duplicate the initial thread handle for the subsystem to have */
Status = NtDuplicateObject(NtCurrentProcess(),
ProcessInformation.ThreadHandle,
Subsystem->ProcessHandle,
&CreateSession->ProcessInfo.ThreadHandle,
THREAD_ALL_ACCESS,
0,
0);
if (!NT_SUCCESS(Status))
{
/* Fail since this is critical */
DPRINT1("SMSS: SmpLoadSubSystem - NtDuplicateObject Failed with Status %lx for sessionid %lu\n",
Status,
MuSessionId);
goto Quickie;
}
/* Allocate an internal Session ID for this subsystem */
MuSessionId = SmpAllocateSessionId(Subsystem, 0);
CreateSession->SessionId = MuSessionId;
/* Send the create session message to the subsystem */
SbApiMsg2.ReturnValue = STATUS_SUCCESS;
SbApiMsg2.h.u2.ZeroInit = 0;
SbApiMsg2.h.u1.s1.DataLength = sizeof(SB_CREATE_SESSION_MSG) + 8;
SbApiMsg2.h.u1.s1.TotalLength = sizeof(SB_API_MSG);
Status = NtRequestWaitReplyPort(Subsystem->SbApiPort,
&SbApiMsg2.h,
&SbApiMsg2.h);
if (NT_SUCCESS(Status)) Status = SbApiMsg2.ReturnValue;
if (!NT_SUCCESS(Status))
{
/* Delete the session and handle failure if the LPC call failed */
SmpDeleteSession(CreateSession->SessionId);
DPRINT1("SMSS: SmpLoadSubSystem - NtRequestWaitReplyPort Failed with Status %lx for sessionid %lu\n",
Status,
CreateSession->SessionId);
goto Quickie;
}
}
/* Okay, everything looks good to go, initialize this subsystem now! */
Status = NtResumeThread(ProcessInformation.ThreadHandle, NULL);
if (!NT_SUCCESS(Status))
{
/* That didn't work -- back out of everything */
DPRINT1("SMSS: SmpLoadSubSystem - NtResumeThread failed Status %lx\n", Status);
goto Quickie;
}
/* Check if this was the subsystem for a different session */
if (MuSessionId)
{
/* Wait up to 60 seconds for it to initialize */
Timeout.QuadPart = -600000000;
Status = NtWaitForSingleObject(NewSubsystem->Event, FALSE, &Timeout);
/* Timeout is done -- does this session still exist? */
if (!SmpCheckDuplicateMuSessionId(MuSessionId))
{
/* Nope, it died. Cleanup should've ocurred in a different path. */
DPRINT1("SMSS: SmpLoadSubSystem - session deleted\n");
return STATUS_DELETE_PENDING;
}
/* Check if we timed our or there was another error with the wait */
if (Status != STATUS_WAIT_0)
{
/* Something is wrong with the subsystem, so back out of everything */
DPRINT1("SMSS: SmpLoadSubSystem - Timeout waiting for subsystem connect with Status %lx for sessionid %lu\n",
Status,
MuSessionId);
goto Quickie;
}
}
else
{
/* This a session 0 subsystem, just wait for it to initialize */
NtWaitForSingleObject(NewSubsystem->Event, FALSE, NULL);
}
/* Subsystem is created, resumed, and initialized. Close handles and exit */
NtClose(ProcessInformation.ThreadHandle);
Status = STATUS_SUCCESS;
goto Quickie2;
Quickie:
/* This is the failure path. First check if we need to detach from session */
if ((AttachedSessionId == -1) || (Flags & (SMP_POSIX_FLAG | SMP_OS2_FLAG)))
{
/* We were not attached, or did not launch subsystems that required it */
DPRINT1("SMSS: Did not detach from Session Space: SessionId=%x Flags=%x Status=%x\n",
AttachedSessionId,
Flags | SMP_DEFERRED_FLAG,
Status);
}
else
{
/* Get the privilege we need for detachment */
Status = SmpAcquirePrivilege(SE_LOAD_DRIVER_PRIVILEGE, &State);
if (!NT_SUCCESS(Status))
{
/* We can't detach without it */
DPRINT1("SMSS: Did not detach from Session Space: SessionId=%x Flags=%x Status=%x\n",
AttachedSessionId,
Flags | SMP_DEFERRED_FLAG,
Status);
}
else
{
/* Now detach from the session */
Status = NtSetSystemInformation(SystemSessionDetach,
&AttachedSessionId,
sizeof(AttachedSessionId));
if (!NT_SUCCESS(Status))
{
/* Failed to detach. Note the DPRINT1 has a typo in Windows */
DPRINT1("SMSS: SmpStartCsr, Couldn't Detach from Session Space. Status=%x\n", Status);
ASSERT(NT_SUCCESS(Status));
}
else
{
/* Detachment worked, reset our attached session ID */
AttachedSessionId = -1;
}
/* And release the privilege we acquired */
SmpReleasePrivilege(State);
}
}
/* Since this is the failure path, terminate the subsystem process */
NtTerminateProcess(ProcessInformation.ProcessHandle, Status);
NtClose(ProcessInformation.ThreadHandle);
Quickie2:
/* This is the cleanup path -- first dereference our subsystems */
RtlEnterCriticalSection(&SmpKnownSubSysLock);
if (Subsystem) SmpDereferenceSubsystem(Subsystem);
if (KnownSubsystem) SmpDereferenceSubsystem(KnownSubsystem);
/* In the failure case, destroy the new subsystem we just created */
if (!NT_SUCCESS(Status))
{
RemoveEntryList(&NewSubsystem->Entry);
NtSetEvent(NewSubsystem->Event, 0);
SmpDereferenceSubsystem(NewSubsystem);
}
/* Finally, we're all done! */
RtlLeaveCriticalSection(&SmpKnownSubSysLock);
return Status;
}
NTSTATUS
NTAPI
SmpLoadSubSystemsForMuSession(IN PULONG MuSessionId,
OUT PHANDLE ProcessId,
IN PUNICODE_STRING InitialCommand)
{
NTSTATUS Status = STATUS_SUCCESS, Status2;
PSMP_REGISTRY_VALUE RegEntry;
UNICODE_STRING DestinationString, NtPath;
PLIST_ENTRY NextEntry;
LARGE_INTEGER Timeout;
PVOID State;
/* Write a few last registry keys with the boot partition information */
SmpTranslateSystemPartitionInformation();
/* Process "SetupExecute" values */
NextEntry = SmpSetupExecuteList.Flink;
while (NextEntry != &SmpSetupExecuteList)
{
/* Execute each one and move on */
RegEntry = CONTAINING_RECORD(NextEntry, SMP_REGISTRY_VALUE, Entry);
SmpExecuteCommand(&RegEntry->Name, 0, NULL, 0);
NextEntry = NextEntry->Flink;
}
/* Now process the subsystems */
NextEntry = SmpSubSystemList.Flink;
while (NextEntry != &SmpSubSystemList)
{
/* Get the entry and check if this is the special Win32k entry */
RegEntry = CONTAINING_RECORD(NextEntry, SMP_REGISTRY_VALUE, Entry);
if (_wcsicmp(RegEntry->Name.Buffer, L"Kmode") == 0)
{
/* Translate it */
if (!RtlDosPathNameToNtPathName_U(RegEntry->Value.Buffer,
&NtPath,
NULL,
NULL))
{
Status = STATUS_OBJECT_PATH_SYNTAX_BAD;
DPRINT1("Failed: %lx\n", Status);
}
else
{
/* Get the driver privilege */
Status = SmpAcquirePrivilege(SE_LOAD_DRIVER_PRIVILEGE, &State);
if (NT_SUCCESS(Status))
{
/* Create the new session */
ASSERT(AttachedSessionId == -1);
Status = NtSetSystemInformation(SystemSessionCreate,
MuSessionId,
sizeof(*MuSessionId));
if (!NT_SUCCESS(Status))
{
DPRINT1("SMSS: Session space creation failed\n");
SmpReleasePrivilege(State);
RtlFreeHeap(RtlGetProcessHeap(), 0, NtPath.Buffer);
return Status;
}
AttachedSessionId = *MuSessionId;
/*
* Start Win32k.sys on this session. Use a hardcoded value
* instead of the Kmode one...
*/
RtlInitUnicodeString(&DestinationString,
L"\\SystemRoot\\System32\\win32k.sys");
Status = NtSetSystemInformation(SystemExtendServiceTableInformation,
&DestinationString,
sizeof(DestinationString));
RtlFreeHeap(RtlGetProcessHeap(), 0, NtPath.Buffer);
SmpReleasePrivilege(State);
if (!NT_SUCCESS(Status))
{
DPRINT1("SMSS: Load of WIN32K failed.\n");
return Status;
}
}
}
}
/* Next entry */
NextEntry = NextEntry->Flink;
}
/* Now parse the required subsystem list */
NextEntry = SmpSubSystemsToLoad.Flink;
while (NextEntry != &SmpSubSystemsToLoad)
{
/* Get each entry and check if it's the internal debug or not */
RegEntry = CONTAINING_RECORD(NextEntry, SMP_REGISTRY_VALUE, Entry);
if (_wcsicmp(RegEntry->Name.Buffer, L"Debug") == 0)
{
/* Load the internal debug system */
Status = SmpExecuteCommand(&RegEntry->Value,
*MuSessionId,
ProcessId,
SMP_DEBUG_FLAG | SMP_SUBSYSTEM_FLAG);
}
else
{
/* Load the required subsystem */
Status = SmpExecuteCommand(&RegEntry->Value,
*MuSessionId,
ProcessId,
SMP_SUBSYSTEM_FLAG);
}
if (!NT_SUCCESS(Status))
{
DbgPrint("SMSS: Subsystem execute failed (%wZ)\n", &RegEntry->Value);
return Status;
}
/* Move to the next entry */
NextEntry = NextEntry->Flink;
}
/* Process the "Execute" list now */
NextEntry = SmpExecuteList.Blink;
if (NextEntry != &SmpExecuteList)
{
/* Get the custom initial command */
RegEntry = CONTAINING_RECORD(NextEntry, SMP_REGISTRY_VALUE, Entry);
/* Write the initial command and wait for 5 seconds (why??!) */
*InitialCommand = RegEntry->Name;
Timeout.QuadPart = -50000000;
NtDelayExecution(FALSE, &Timeout);
}
else
{
/* Use the default Winlogon initial command */
RtlInitUnicodeString(InitialCommand, L"winlogon.exe");
InitialCommandBuffer[0] = UNICODE_NULL;
/* Check if there's a debugger for Winlogon */
Status2 = LdrQueryImageFileExecutionOptions(InitialCommand,
L"Debugger",
REG_SZ,
InitialCommandBuffer,
sizeof(InitialCommandBuffer) -
InitialCommand->Length,
NULL);
if ((NT_SUCCESS(Status2)) && (InitialCommandBuffer[0]))
{
/* Put the debugger string with the Winlogon string */
wcscat(InitialCommandBuffer, L" ");
wcscat(InitialCommandBuffer, InitialCommand->Buffer);
RtlInitUnicodeString(InitialCommand, InitialCommandBuffer);
}
}
/* Finally check if there was a custom initial command */
NextEntry = SmpExecuteList.Flink;
while (NextEntry != &SmpExecuteList)
{
/* Execute each one */
RegEntry = CONTAINING_RECORD(NextEntry, SMP_REGISTRY_VALUE, Entry);
SmpExecuteCommand(&RegEntry->Name, *MuSessionId, NULL, 0);
NextEntry = NextEntry->Flink;
}
/* Return status */
return Status;
}
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