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reactos/ntoskrnl/config/cmapi.c
George Bișoc fe23a4aaeb
[NTOS:CM] Lock the entire registry down when we unload a hive 
The PR #6649 which fixed an issue with orphaned KCBs leaking in memory which also pointed to unloaded registry hives, it also brought a problem.
In CmpEnumerateOpenSubKeys there is a risk of getting hit by a deadlock as we enumerate the cache table to remove empty cache entries.

Fundamentally CmpEnumerateOpenSubKeys locks down a KCB from cache for exclusive use in order to tear down its contents from memory but it doesn't address the fact a KCB might have already been locked in the same calling thread, leading to a recursion.
This leads to random hangs when unloading a hive during system startup (tipically on a clean install).

The solution here is to simply lock the whole registry when we unload a hive so that we don't have to worry the KCBs are getting tampered by anybody else. This also simplifies the code.
Although locking the entire registry while other apps are doing registry related operations to other hives can cause overhead. If this turns out to be bad then we have to rethink the locking mechanism here.

CORE-19539
2024-06-01 16:17:47 +02:00

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/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/config/cmapi.c
* PURPOSE: Configuration Manager - Internal Registry APIs
* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
* Eric Kohl
* Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
/* INCLUDES ******************************************************************/
#include "ntoskrnl.h"
#define NDEBUG
#include "debug.h"
/* FUNCTIONS *****************************************************************/
BOOLEAN
NTAPI
CmpIsHiveAlreadyLoaded(IN HANDLE KeyHandle,
IN POBJECT_ATTRIBUTES SourceFile,
OUT PCMHIVE *CmHive)
{
NTSTATUS Status;
PCM_KEY_BODY KeyBody;
PCMHIVE Hive;
BOOLEAN Loaded = FALSE;
PAGED_CODE();
/* Sanity check */
CMP_ASSERT_EXCLUSIVE_REGISTRY_LOCK();
/* Reference the handle */
Status = ObReferenceObjectByHandle(KeyHandle,
0,
CmpKeyObjectType,
KernelMode,
(PVOID)&KeyBody,
NULL);
if (!NT_SUCCESS(Status)) return Loaded;
/* Don't touch deleted KCBs */
if (KeyBody->KeyControlBlock->Delete) return Loaded;
Hive = CONTAINING_RECORD(KeyBody->KeyControlBlock->KeyHive, CMHIVE, Hive);
/* Must be the root key */
if (!(KeyBody->KeyControlBlock->Flags & KEY_HIVE_ENTRY) ||
!(Hive->FileUserName.Buffer))
{
/* It isn't */
ObDereferenceObject(KeyBody);
return Loaded;
}
/* Now compare the name of the file */
if (!RtlCompareUnicodeString(&Hive->FileUserName,
SourceFile->ObjectName,
TRUE))
{
/* Same file found */
Loaded = TRUE;
*CmHive = Hive;
/* If the hive is frozen, not sure what to do */
if (Hive->Frozen)
{
/* FIXME: TODO */
UNIMPLEMENTED_DBGBREAK("ERROR: Hive is frozen\n");
}
}
/* Dereference and return result */
ObDereferenceObject(KeyBody);
return Loaded;
}
BOOLEAN
NTAPI
CmpDoFlushAll(IN BOOLEAN ForceFlush)
{
PLIST_ENTRY NextEntry;
PCMHIVE Hive;
NTSTATUS Status;
BOOLEAN Result = TRUE;
/* Make sure that the registry isn't read-only now */
if (CmpNoWrite) return TRUE;
/* Otherwise, acquire the hive list lock and disable force flush */
CmpForceForceFlush = FALSE;
ExAcquirePushLockShared(&CmpHiveListHeadLock);
/* Loop the hive list */
NextEntry = CmpHiveListHead.Flink;
while (NextEntry != &CmpHiveListHead)
{
/* Get the hive */
Hive = CONTAINING_RECORD(NextEntry, CMHIVE, HiveList);
if (!(Hive->Hive.HiveFlags & HIVE_NOLAZYFLUSH))
{
/* Acquire the flusher lock */
CmpLockHiveFlusherExclusive(Hive);
/* Check for illegal state */
if (ForceFlush && Hive->UseCount)
{
/* Registry needs to be locked down */
CMP_ASSERT_EXCLUSIVE_REGISTRY_LOCK();
UNIMPLEMENTED_DBGBREAK("FIXME: Hive is damaged and needs fixup\n");
}
/* Only sync if we are forced to or if it won't cause a hive shrink */
if (ForceFlush || !HvHiveWillShrink(&Hive->Hive))
{
/* Do the sync */
Status = HvSyncHive(&Hive->Hive);
/* If something failed - set the flag and continue looping */
if (!NT_SUCCESS(Status))
Result = FALSE;
}
else
{
/* We won't flush if the hive might shrink */
Result = FALSE;
CmpForceForceFlush = TRUE;
}
/* Release the flusher lock */
CmpUnlockHiveFlusher(Hive);
}
/* Try the next entry */
NextEntry = NextEntry->Flink;
}
/* Release lock and return */
ExReleasePushLock(&CmpHiveListHeadLock);
return Result;
}
NTSTATUS
NTAPI
CmpSetValueKeyNew(IN PHHIVE Hive,
IN PCM_KEY_NODE Parent,
IN PUNICODE_STRING ValueName,
IN ULONG Index,
IN ULONG Type,
IN PVOID Data,
IN ULONG DataSize,
IN ULONG StorageType,
IN ULONG SmallData)
{
PCELL_DATA CellData;
HCELL_INDEX ValueCell;
NTSTATUS Status;
/* Check if we already have a value list */
if (Parent->ValueList.Count)
{
/* Then make sure it's valid and dirty it */
ASSERT(Parent->ValueList.List != HCELL_NIL);
if (!HvMarkCellDirty(Hive, Parent->ValueList.List, FALSE))
{
/* Fail if we're out of space for log changes */
return STATUS_NO_LOG_SPACE;
}
}
/* Allocate a value cell */
ValueCell = HvAllocateCell(Hive,
FIELD_OFFSET(CM_KEY_VALUE, Name) +
CmpNameSize(Hive, ValueName),
StorageType,
HCELL_NIL);
if (ValueCell == HCELL_NIL) return STATUS_INSUFFICIENT_RESOURCES;
/* Get the actual data for it */
CellData = HvGetCell(Hive, ValueCell);
ASSERT(CellData);
/* Now we can release it, make sure it's also dirty */
HvReleaseCell(Hive, ValueCell);
ASSERT(HvIsCellDirty(Hive, ValueCell));
/* Set it up and copy the name */
CellData->u.KeyValue.Signature = CM_KEY_VALUE_SIGNATURE;
_SEH2_TRY
{
/* This can crash since the name is coming from user-mode */
CellData->u.KeyValue.NameLength = CmpCopyName(Hive,
CellData->u.KeyValue.Name,
ValueName);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Fail */
DPRINT1("Invalid user data!\n");
HvFreeCell(Hive, ValueCell);
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
/* Check for compressed name */
if (CellData->u.KeyValue.NameLength < ValueName->Length)
{
/* This is a compressed name */
CellData->u.KeyValue.Flags = VALUE_COMP_NAME;
}
else
{
/* No flags to set */
CellData->u.KeyValue.Flags = 0;
}
/* Check if this is a normal key */
if (DataSize > CM_KEY_VALUE_SMALL)
{
/* Build a data cell for it */
Status = CmpSetValueDataNew(Hive,
Data,
DataSize,
StorageType,
ValueCell,
&CellData->u.KeyValue.Data);
if (!NT_SUCCESS(Status))
{
/* We failed, free the cell */
HvFreeCell(Hive, ValueCell);
return Status;
}
/* Otherwise, set the data length, and make sure the data is dirty */
CellData->u.KeyValue.DataLength = DataSize;
ASSERT(HvIsCellDirty(Hive, CellData->u.KeyValue.Data));
}
else
{
/* This is a small key, set the data directly inside */
CellData->u.KeyValue.DataLength = DataSize + CM_KEY_VALUE_SPECIAL_SIZE;
CellData->u.KeyValue.Data = SmallData;
}
/* Set the type now */
CellData->u.KeyValue.Type = Type;
/* Add this value cell to the child list */
Status = CmpAddValueToList(Hive,
ValueCell,
Index,
StorageType,
&Parent->ValueList);
/* If we failed, free the entire cell, including the data */
if (!NT_SUCCESS(Status))
{
/* Overwrite the status with a known one */
CmpFreeValue(Hive, ValueCell);
Status = STATUS_INSUFFICIENT_RESOURCES;
}
/* Return Status */
return Status;
}
NTSTATUS
NTAPI
CmpSetValueKeyExisting(IN PHHIVE Hive,
IN HCELL_INDEX OldChild,
IN PCM_KEY_VALUE Value,
IN ULONG Type,
IN PVOID Data,
IN ULONG DataSize,
IN ULONG StorageType,
IN ULONG TempData)
{
HCELL_INDEX DataCell, NewCell;
PCELL_DATA CellData;
ULONG Length;
BOOLEAN WasSmall, IsSmall;
/* Registry writes must be blocked */
CMP_ASSERT_FLUSH_LOCK(Hive);
/* Mark the old child cell dirty */
if (!HvMarkCellDirty(Hive, OldChild, FALSE)) return STATUS_NO_LOG_SPACE;
/* See if this is a small or normal key */
WasSmall = CmpIsKeyValueSmall(&Length, Value->DataLength);
/* See if our new data can fit in a small key */
IsSmall = (DataSize <= CM_KEY_VALUE_SMALL) ? TRUE: FALSE;
/* Big keys are unsupported */
ASSERT_VALUE_BIG(Hive, Length);
ASSERT_VALUE_BIG(Hive, DataSize);
/* Mark the old value dirty */
if (!CmpMarkValueDataDirty(Hive, Value)) return STATUS_NO_LOG_SPACE;
/* Check if we have a small key */
if (IsSmall)
{
/* Check if we had a normal key with some data in it */
if (!(WasSmall) && (Length > 0))
{
/* Free the previous data */
CmpFreeValueData(Hive, Value->Data, Length);
}
/* Write our data directly */
Value->DataLength = DataSize + CM_KEY_VALUE_SPECIAL_SIZE;
Value->Data = TempData;
Value->Type = Type;
return STATUS_SUCCESS;
}
/* We have a normal key. Was the old cell also normal and had data? */
if (!(WasSmall) && (Length > 0))
{
/* Get the current data cell and actual data inside it */
DataCell = Value->Data;
ASSERT(DataCell != HCELL_NIL);
CellData = HvGetCell(Hive, DataCell);
if (!CellData) return STATUS_INSUFFICIENT_RESOURCES;
/* Immediately release the cell */
HvReleaseCell(Hive, DataCell);
/* Make sure that the data cell actually has a size */
ASSERT(HvGetCellSize(Hive, CellData) > 0);
/* Check if the previous data cell could fit our new data */
if (DataSize <= (ULONG)(HvGetCellSize(Hive, CellData)))
{
/* Re-use it then */
NewCell = DataCell;
}
else
{
/* Otherwise, re-allocate the current data cell */
NewCell = HvReallocateCell(Hive, DataCell, DataSize);
if (NewCell == HCELL_NIL) return STATUS_INSUFFICIENT_RESOURCES;
}
}
else
{
/* This was a small key, or a key with no data, allocate a cell */
NewCell = HvAllocateCell(Hive, DataSize, StorageType, HCELL_NIL);
if (NewCell == HCELL_NIL) return STATUS_INSUFFICIENT_RESOURCES;
}
/* Now get the actual data for our data cell */
CellData = HvGetCell(Hive, NewCell);
ASSERT(CellData);
/* Release it immediately */
HvReleaseCell(Hive, NewCell);
/* Copy our data into the data cell's buffer, and set up the value */
RtlCopyMemory(CellData, Data, DataSize);
Value->Data = NewCell;
Value->DataLength = DataSize;
Value->Type = Type;
/* Return success */
ASSERT(HvIsCellDirty(Hive, NewCell));
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
CmpQueryKeyData(IN PHHIVE Hive,
IN PCM_KEY_NODE Node,
IN KEY_INFORMATION_CLASS KeyInformationClass,
IN OUT PVOID KeyInformation,
IN ULONG Length,
IN OUT PULONG ResultLength)
{
NTSTATUS Status;
ULONG Size, SizeLeft, MinimumSize, Offset;
PKEY_INFORMATION Info = (PKEY_INFORMATION)KeyInformation;
USHORT NameLength;
PVOID ClassData;
/* Check if the value is compressed */
if (Node->Flags & KEY_COMP_NAME)
{
/* Get the compressed name size */
NameLength = CmpCompressedNameSize(Node->Name, Node->NameLength);
}
else
{
/* Get the real size */
NameLength = Node->NameLength;
}
/* Check what kind of information is being requested */
switch (KeyInformationClass)
{
/* Basic information */
case KeyBasicInformation:
/* This is the size we need */
Size = FIELD_OFFSET(KEY_BASIC_INFORMATION, Name) + NameLength;
/* And this is the minimum we can work with */
MinimumSize = FIELD_OFFSET(KEY_BASIC_INFORMATION, Name);
/* Let the caller know and assume success */
*ResultLength = Size;
Status = STATUS_SUCCESS;
/* Check if the bufer we got is too small */
if (Length < MinimumSize)
{
/* Let the caller know and fail */
Status = STATUS_BUFFER_TOO_SMALL;
break;
}
/* Copy the basic information */
Info->KeyBasicInformation.LastWriteTime = Node->LastWriteTime;
Info->KeyBasicInformation.TitleIndex = 0;
Info->KeyBasicInformation.NameLength = NameLength;
/* Only the name is left */
SizeLeft = Length - MinimumSize;
Size = NameLength;
/* Check if we don't have enough space for the name */
if (SizeLeft < Size)
{
/* Truncate the name we'll return, and tell the caller */
Size = SizeLeft;
Status = STATUS_BUFFER_OVERFLOW;
}
/* Check if this is a compressed key */
if (Node->Flags & KEY_COMP_NAME)
{
/* Copy the compressed name */
CmpCopyCompressedName(Info->KeyBasicInformation.Name,
SizeLeft,
Node->Name,
Node->NameLength);
}
else
{
/* Otherwise, copy the raw name */
RtlCopyMemory(Info->KeyBasicInformation.Name,
Node->Name,
Size);
}
break;
/* Node information */
case KeyNodeInformation:
/* Calculate the size we need */
Size = FIELD_OFFSET(KEY_NODE_INFORMATION, Name) +
NameLength +
Node->ClassLength;
/* And the minimum size we can support */
MinimumSize = FIELD_OFFSET(KEY_NODE_INFORMATION, Name);
/* Return the size to the caller and assume succes */
*ResultLength = Size;
Status = STATUS_SUCCESS;
/* Check if the caller's buffer is too small */
if (Length < MinimumSize)
{
/* Let them know, and fail */
Status = STATUS_BUFFER_TOO_SMALL;
break;
}
/* Copy the basic information */
Info->KeyNodeInformation.LastWriteTime = Node->LastWriteTime;
Info->KeyNodeInformation.TitleIndex = 0;
Info->KeyNodeInformation.ClassLength = Node->ClassLength;
Info->KeyNodeInformation.NameLength = NameLength;
/* Now the name is left */
SizeLeft = Length - MinimumSize;
Size = NameLength;
/* Check if the name can fit entirely */
if (SizeLeft < Size)
{
/* It can't, we'll have to truncate. Tell the caller */
Size = SizeLeft;
Status = STATUS_BUFFER_OVERFLOW;
}
/* Check if the key node name is compressed */
if (Node->Flags & KEY_COMP_NAME)
{
/* Copy the compressed name */
CmpCopyCompressedName(Info->KeyNodeInformation.Name,
SizeLeft,
Node->Name,
Node->NameLength);
}
else
{
/* It isn't, so copy the raw name */
RtlCopyMemory(Info->KeyNodeInformation.Name,
Node->Name,
Size);
}
/* Check if the node has a class */
if (Node->ClassLength > 0)
{
/* Set the class offset */
Offset = FIELD_OFFSET(KEY_NODE_INFORMATION, Name) + NameLength;
Offset = ALIGN_UP_BY(Offset, sizeof(ULONG));
Info->KeyNodeInformation.ClassOffset = Offset;
/* Get the class data */
ClassData = HvGetCell(Hive, Node->Class);
if (ClassData == NULL)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
/* Check if we can copy anything */
if (Length > Offset)
{
/* Copy the class data */
RtlCopyMemory((PUCHAR)Info + Offset,
ClassData,
min(Node->ClassLength, Length - Offset));
}
/* Check if the buffer was large enough */
if (Length < Offset + Node->ClassLength)
{
Status = STATUS_BUFFER_OVERFLOW;
}
/* Release the class cell */
HvReleaseCell(Hive, Node->Class);
}
else
{
/* It doesn't, so set offset to -1, not 0! */
Info->KeyNodeInformation.ClassOffset = 0xFFFFFFFF;
}
break;
/* Full information requsted */
case KeyFullInformation:
/* This is the size we need */
Size = FIELD_OFFSET(KEY_FULL_INFORMATION, Class) +
Node->ClassLength;
/* This is what we can work with */
MinimumSize = FIELD_OFFSET(KEY_FULL_INFORMATION, Class);
/* Return it to caller and assume success */
*ResultLength = Size;
Status = STATUS_SUCCESS;
/* Check if the caller's buffer is to small */
if (Length < MinimumSize)
{
/* Let them know and fail */
Status = STATUS_BUFFER_TOO_SMALL;
break;
}
/* Now copy all the basic information */
Info->KeyFullInformation.LastWriteTime = Node->LastWriteTime;
Info->KeyFullInformation.TitleIndex = 0;
Info->KeyFullInformation.ClassLength = Node->ClassLength;
Info->KeyFullInformation.SubKeys = Node->SubKeyCounts[Stable] +
Node->SubKeyCounts[Volatile];
Info->KeyFullInformation.Values = Node->ValueList.Count;
Info->KeyFullInformation.MaxNameLen = Node->MaxNameLen;
Info->KeyFullInformation.MaxClassLen = Node->MaxClassLen;
Info->KeyFullInformation.MaxValueNameLen = Node->MaxValueNameLen;
Info->KeyFullInformation.MaxValueDataLen = Node->MaxValueDataLen;
/* Check if we have a class */
if (Node->ClassLength > 0)
{
/* Set the class offset */
Offset = FIELD_OFFSET(KEY_FULL_INFORMATION, Class);
Info->KeyFullInformation.ClassOffset = Offset;
/* Get the class data */
ClassData = HvGetCell(Hive, Node->Class);
if (ClassData == NULL)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
/* Copy the class data */
ASSERT(Length >= Offset);
RtlCopyMemory(Info->KeyFullInformation.Class,
ClassData,
min(Node->ClassLength, Length - Offset));
/* Check if the buffer was large enough */
if (Length < Offset + Node->ClassLength)
{
Status = STATUS_BUFFER_OVERFLOW;
}
/* Release the class cell */
HvReleaseCell(Hive, Node->Class);
}
else
{
/* We don't have a class, so set offset to -1, not 0! */
Info->KeyFullInformation.ClassOffset = 0xFFFFFFFF;
}
break;
/* Any other class that got sent here is invalid! */
default:
/* Set failure code */
Status = STATUS_INVALID_PARAMETER;
break;
}
/* Return status */
return Status;
}
NTSTATUS
NTAPI
CmSetValueKey(IN PCM_KEY_CONTROL_BLOCK Kcb,
IN PUNICODE_STRING ValueName,
IN ULONG Type,
IN PVOID Data,
IN ULONG DataLength)
{
PHHIVE Hive = NULL;
PCM_KEY_NODE Parent;
PCM_KEY_VALUE Value = NULL;
HCELL_INDEX CurrentChild, Cell;
NTSTATUS Status;
BOOLEAN Found, Result;
ULONG Count, ChildIndex, SmallData, Storage;
VALUE_SEARCH_RETURN_TYPE SearchResult;
BOOLEAN FirstTry = TRUE, FlusherLocked = FALSE;
HCELL_INDEX ParentCell = HCELL_NIL, ChildCell = HCELL_NIL;
/* Acquire hive and KCB lock */
CmpLockRegistry();
CmpAcquireKcbLockShared(Kcb);
/* Sanity check */
ASSERT(sizeof(ULONG) == CM_KEY_VALUE_SMALL);
/* Don't touch deleted KCBs */
DoAgain:
if (Kcb->Delete)
{
/* Fail */
Status = STATUS_KEY_DELETED;
goto Quickie;
}
/* Don't let anyone mess with symlinks */
if ((Kcb->Flags & KEY_SYM_LINK) &&
((Type != REG_LINK) ||
!(ValueName) ||
!(RtlEqualUnicodeString(&CmSymbolicLinkValueName, ValueName, TRUE))))
{
/* Invalid modification of a symlink key */
Status = STATUS_ACCESS_DENIED;
goto Quickie;
}
/* Check if this is the first attempt */
if (FirstTry)
{
/* Search for the value in the cache */
SearchResult = CmpCompareNewValueDataAgainstKCBCache(Kcb,
ValueName,
Type,
Data,
DataLength);
if (SearchResult == SearchNeedExclusiveLock)
{
/* Try again with the exclusive lock */
CmpConvertKcbSharedToExclusive(Kcb);
goto DoAgain;
}
else if (SearchResult == SearchSuccess)
{
/* We don't actually need to do anything! */
Status = STATUS_SUCCESS;
goto Quickie;
}
/* We need the exclusive KCB lock now */
if (!CmpIsKcbLockedExclusive(Kcb) &&
!CmpTryToConvertKcbSharedToExclusive(Kcb))
{
/* Acquire exclusive lock */
CmpConvertKcbSharedToExclusive(Kcb);
}
/* Cache lookup failed, so don't try it next time */
FirstTry = FALSE;
/* Now grab the flush lock since the key will be modified */
ASSERT(FlusherLocked == FALSE);
CmpLockHiveFlusherShared((PCMHIVE)Kcb->KeyHive);
FlusherLocked = TRUE;
goto DoAgain;
}
else
{
/* Get pointer to key cell */
Hive = Kcb->KeyHive;
Cell = Kcb->KeyCell;
/* Get the parent */
Parent = (PCM_KEY_NODE)HvGetCell(Hive, Cell);
ASSERT(Parent);
ParentCell = Cell;
/* Prepare to scan the key node */
Count = Parent->ValueList.Count;
Found = FALSE;
if (Count > 0)
{
/* Try to find the existing name */
Result = CmpFindNameInList(Hive,
&Parent->ValueList,
ValueName,
&ChildIndex,
&CurrentChild);
if (!Result)
{
/* Fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Quickie;
}
/* Check if we found something */
if (CurrentChild != HCELL_NIL)
{
/* Release existing child */
if (ChildCell != HCELL_NIL)
{
HvReleaseCell(Hive, ChildCell);
ChildCell = HCELL_NIL;
}
/* Get its value */
Value = (PCM_KEY_VALUE)HvGetCell(Hive, CurrentChild);
if (!Value)
{
/* Fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Quickie;
}
/* Remember that we found it */
ChildCell = CurrentChild;
Found = TRUE;
}
}
else
{
/* No child list, we'll need to add it */
ChildIndex = 0;
}
}
/* Should only get here on the second pass */
ASSERT(FirstTry == FALSE);
/* The KCB must be locked exclusive at this point */
CMP_ASSERT_KCB_LOCK(Kcb);
/* Mark the cell dirty */
if (!HvMarkCellDirty(Hive, Cell, FALSE))
{
/* Not enough log space, fail */
Status = STATUS_NO_LOG_SPACE;
goto Quickie;
}
/* Get the storage type */
Storage = HvGetCellType(Cell);
/* Check if this is small data */
SmallData = 0;
if ((DataLength <= CM_KEY_VALUE_SMALL) && (DataLength > 0))
{
/* Need SEH because user data may be invalid */
_SEH2_TRY
{
/* Copy it */
RtlCopyMemory(&SmallData, Data, DataLength);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Return failure code */
Status = _SEH2_GetExceptionCode();
_SEH2_YIELD(goto Quickie);
}
_SEH2_END;
}
/* Check if we didn't find a matching key */
if (!Found)
{
/* Call the internal routine */
Status = CmpSetValueKeyNew(Hive,
Parent,
ValueName,
ChildIndex,
Type,
Data,
DataLength,
Storage,
SmallData);
}
else
{
/* Call the internal routine */
Status = CmpSetValueKeyExisting(Hive,
CurrentChild,
Value,
Type,
Data,
DataLength,
Storage,
SmallData);
}
/* Check for success */
if (NT_SUCCESS(Status))
{
/* Check if the maximum value name length changed */
ASSERT(Parent->MaxValueNameLen == Kcb->KcbMaxValueNameLen);
if (Parent->MaxValueNameLen < ValueName->Length)
{
/* Set the new values */
Parent->MaxValueNameLen = ValueName->Length;
Kcb->KcbMaxValueNameLen = ValueName->Length;
}
/* Check if the maximum data length changed */
ASSERT(Parent->MaxValueDataLen == Kcb->KcbMaxValueDataLen);
if (Parent->MaxValueDataLen < DataLength)
{
/* Update it */
Parent->MaxValueDataLen = DataLength;
Kcb->KcbMaxValueDataLen = Parent->MaxValueDataLen;
}
/* Save the write time */
KeQuerySystemTime(&Parent->LastWriteTime);
Kcb->KcbLastWriteTime = Parent->LastWriteTime;
/* Check if the cell is cached */
if (Found && CMP_IS_CELL_CACHED(Kcb->ValueCache.ValueList))
{
/* Shouldn't happen */
ASSERT(FALSE);
}
else
{
/* Cleanup the value cache */
CmpCleanUpKcbValueCache(Kcb);
/* Sanity checks */
ASSERT(!CMP_IS_CELL_CACHED(Kcb->ValueCache.ValueList));
ASSERT(!(Kcb->ExtFlags & CM_KCB_SYM_LINK_FOUND));
/* Set the value cache */
Kcb->ValueCache.Count = Parent->ValueList.Count;
Kcb->ValueCache.ValueList = Parent->ValueList.List;
}
/* Notify registered callbacks */
CmpReportNotify(Kcb,
Hive,
Kcb->KeyCell,
REG_NOTIFY_CHANGE_LAST_SET);
}
/* Release the cells */
Quickie:
if ((ParentCell != HCELL_NIL) && Hive) HvReleaseCell(Hive, ParentCell);
if ((ChildCell != HCELL_NIL) && Hive) HvReleaseCell(Hive, ChildCell);
/* Release the locks */
if (FlusherLocked) CmpUnlockHiveFlusher((PCMHIVE)Hive);
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return Status;
}
NTSTATUS
NTAPI
CmDeleteValueKey(IN PCM_KEY_CONTROL_BLOCK Kcb,
IN UNICODE_STRING ValueName)
{
NTSTATUS Status = STATUS_OBJECT_NAME_NOT_FOUND;
PHHIVE Hive;
PCM_KEY_NODE Parent;
HCELL_INDEX ChildCell, Cell;
PCHILD_LIST ChildList;
PCM_KEY_VALUE Value = NULL;
ULONG ChildIndex;
BOOLEAN Result;
/* Acquire hive lock */
CmpLockRegistry();
/* Lock KCB exclusively */
CmpAcquireKcbLockExclusive(Kcb);
/* Don't touch deleted keys */
if (Kcb->Delete)
{
/* Undo everything */
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return STATUS_KEY_DELETED;
}
/* Get the hive and the cell index */
Hive = Kcb->KeyHive;
Cell = Kcb->KeyCell;
/* Lock flushes */
CmpLockHiveFlusherShared((PCMHIVE)Hive);
/* Get the parent key node */
Parent = (PCM_KEY_NODE)HvGetCell(Hive, Cell);
ASSERT(Parent);
/* Get the value list and check if it has any entries */
ChildList = &Parent->ValueList;
if (ChildList->Count)
{
/* Try to find this value */
Result = CmpFindNameInList(Hive,
ChildList,
&ValueName,
&ChildIndex,
&ChildCell);
if (!Result)
{
/* Fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Quickie;
}
/* Value not found, return error */
if (ChildCell == HCELL_NIL) goto Quickie;
/* We found the value, mark all relevant cells dirty */
if (!(HvMarkCellDirty(Hive, Cell, FALSE) &&
HvMarkCellDirty(Hive, Parent->ValueList.List, FALSE) &&
HvMarkCellDirty(Hive, ChildCell, FALSE)))
{
/* Not enough log space, fail */
Status = STATUS_NO_LOG_SPACE;
goto Quickie;
}
/* Get the key value */
Value = (PCM_KEY_VALUE)HvGetCell(Hive, ChildCell);
ASSERT(Value);
/* Mark it and all related data as dirty */
if (!CmpMarkValueDataDirty(Hive, Value))
{
/* Not enough log space, fail */
Status = STATUS_NO_LOG_SPACE;
goto Quickie;
}
/* Sanity checks */
ASSERT(HvIsCellDirty(Hive, Parent->ValueList.List));
ASSERT(HvIsCellDirty(Hive, ChildCell));
/* Remove the value from the child list */
Status = CmpRemoveValueFromList(Hive, ChildIndex, ChildList);
if (!NT_SUCCESS(Status))
{
/* Set known error */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Quickie;
}
/* Remove the value and its data itself */
if (!CmpFreeValue(Hive, ChildCell))
{
/* Failed to free the value, fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Quickie;
}
/* Set the last write time */
KeQuerySystemTime(&Parent->LastWriteTime);
Kcb->KcbLastWriteTime = Parent->LastWriteTime;
/* Sanity check */
ASSERT(Parent->MaxValueNameLen == Kcb->KcbMaxValueNameLen);
ASSERT(Parent->MaxValueDataLen == Kcb->KcbMaxValueDataLen);
ASSERT(HvIsCellDirty(Hive, Cell));
/* Check if the value list is empty now */
if (!Parent->ValueList.Count)
{
/* Then clear key node data */
Parent->MaxValueNameLen = 0;
Parent->MaxValueDataLen = 0;
Kcb->KcbMaxValueNameLen = 0;
Kcb->KcbMaxValueDataLen = 0;
}
/* Cleanup the value cache */
CmpCleanUpKcbValueCache(Kcb);
/* Sanity checks */
ASSERT(!CMP_IS_CELL_CACHED(Kcb->ValueCache.ValueList));
ASSERT(!(Kcb->ExtFlags & CM_KCB_SYM_LINK_FOUND));
/* Set the value cache */
Kcb->ValueCache.Count = ChildList->Count;
Kcb->ValueCache.ValueList = ChildList->List;
/* Notify registered callbacks */
CmpReportNotify(Kcb, Hive, Cell, REG_NOTIFY_CHANGE_LAST_SET);
/* Change default Status to success */
Status = STATUS_SUCCESS;
}
Quickie:
/* Release the parent cell, if any */
if (Parent) HvReleaseCell(Hive, Cell);
/* Check if we had a value */
if (Value)
{
/* Release the child cell */
ASSERT(ChildCell != HCELL_NIL);
HvReleaseCell(Hive, ChildCell);
}
/* Release locks */
CmpUnlockHiveFlusher((PCMHIVE)Hive);
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return Status;
}
NTSTATUS
NTAPI
CmQueryValueKey(IN PCM_KEY_CONTROL_BLOCK Kcb,
IN UNICODE_STRING ValueName,
IN KEY_VALUE_INFORMATION_CLASS KeyValueInformationClass,
IN PVOID KeyValueInformation,
IN ULONG Length,
IN PULONG ResultLength)
{
NTSTATUS Status;
PCM_KEY_VALUE ValueData;
ULONG Index;
BOOLEAN ValueCached = FALSE;
PCM_CACHED_VALUE *CachedValue;
HCELL_INDEX CellToRelease;
VALUE_SEARCH_RETURN_TYPE Result;
PHHIVE Hive;
PAGED_CODE();
/* Acquire hive lock */
CmpLockRegistry();
/* Lock the KCB shared */
CmpAcquireKcbLockShared(Kcb);
/* Don't touch deleted keys */
DoAgain:
if (Kcb->Delete)
{
/* Undo everything */
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return STATUS_KEY_DELETED;
}
/* We don't deal with this yet */
if (Kcb->ExtFlags & CM_KCB_SYM_LINK_FOUND)
{
/* Shouldn't happen */
ASSERT(FALSE);
}
/* Get the hive */
Hive = Kcb->KeyHive;
/* Find the key value */
Result = CmpFindValueByNameFromCache(Kcb,
&ValueName,
&CachedValue,
&Index,
&ValueData,
&ValueCached,
&CellToRelease);
if (Result == SearchNeedExclusiveLock)
{
/* Check if we need an exclusive lock */
ASSERT(CellToRelease == HCELL_NIL);
ASSERT(ValueData == NULL);
/* Try with exclusive KCB lock */
CmpConvertKcbSharedToExclusive(Kcb);
goto DoAgain;
}
if (Result == SearchSuccess)
{
/* Sanity check */
ASSERT(ValueData != NULL);
/* User data, protect against exceptions */
_SEH2_TRY
{
/* Query the information requested */
Result = CmpQueryKeyValueData(Kcb,
CachedValue,
ValueData,
ValueCached,
KeyValueInformationClass,
KeyValueInformation,
Length,
ResultLength,
&Status);
if (Result == SearchNeedExclusiveLock)
{
/* Release the value cell */
if (CellToRelease != HCELL_NIL)
{
HvReleaseCell(Hive, CellToRelease);
CellToRelease = HCELL_NIL;
}
/* Try with exclusive KCB lock */
CmpConvertKcbSharedToExclusive(Kcb);
_SEH2_YIELD(goto DoAgain);
}
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
Status = _SEH2_GetExceptionCode();
}
_SEH2_END;
}
else
{
/* Failed to find the value */
Status = STATUS_OBJECT_NAME_NOT_FOUND;
}
/* If we have a cell to release, do so */
if (CellToRelease != HCELL_NIL) HvReleaseCell(Hive, CellToRelease);
/* Release locks */
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return Status;
}
NTSTATUS
NTAPI
CmEnumerateValueKey(IN PCM_KEY_CONTROL_BLOCK Kcb,
IN ULONG Index,
IN KEY_VALUE_INFORMATION_CLASS KeyValueInformationClass,
IN PVOID KeyValueInformation,
IN ULONG Length,
IN PULONG ResultLength)
{
NTSTATUS Status;
PHHIVE Hive;
PCM_KEY_NODE Parent;
HCELL_INDEX CellToRelease = HCELL_NIL, CellToRelease2 = HCELL_NIL;
VALUE_SEARCH_RETURN_TYPE Result;
BOOLEAN IndexIsCached, ValueIsCached = FALSE;
PCELL_DATA CellData;
PCM_CACHED_VALUE *CachedValue;
PCM_KEY_VALUE ValueData = NULL;
PAGED_CODE();
/* Acquire hive lock */
CmpLockRegistry();
/* Lock the KCB shared */
CmpAcquireKcbLockShared(Kcb);
/* Don't touch deleted keys */
DoAgain:
if (Kcb->Delete)
{
/* Undo everything */
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return STATUS_KEY_DELETED;
}
/* Get the hive and parent */
Hive = Kcb->KeyHive;
Parent = (PCM_KEY_NODE)HvGetCell(Hive, Kcb->KeyCell);
ASSERT(Parent);
/* FIXME: Lack of cache? */
if (Kcb->ValueCache.Count != Parent->ValueList.Count)
{
DPRINT1("HACK: Overriding value cache count\n");
Kcb->ValueCache.Count = Parent->ValueList.Count;
}
/* Make sure the index is valid */
if (Index >= Kcb->ValueCache.Count)
{
/* Release the cell and fail */
HvReleaseCell(Hive, Kcb->KeyCell);
Status = STATUS_NO_MORE_ENTRIES;
goto Quickie;
}
/* We don't deal with this yet */
if (Kcb->ExtFlags & CM_KCB_SYM_LINK_FOUND)
{
/* Shouldn't happen */
ASSERT(FALSE);
}
/* Find the value list */
Result = CmpGetValueListFromCache(Kcb,
&CellData,
&IndexIsCached,
&CellToRelease);
if (Result == SearchNeedExclusiveLock)
{
/* Check if we need an exclusive lock */
ASSERT(CellToRelease == HCELL_NIL);
HvReleaseCell(Hive, Kcb->KeyCell);
/* Try with exclusive KCB lock */
CmpConvertKcbSharedToExclusive(Kcb);
goto DoAgain;
}
else if (Result != SearchSuccess)
{
/* Sanity check */
ASSERT(CellData == NULL);
/* Release the cell and fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Quickie;
}
/* Now get the key value */
Result = CmpGetValueKeyFromCache(Kcb,
CellData,
Index,
&CachedValue,
&ValueData,
IndexIsCached,
&ValueIsCached,
&CellToRelease2);
if (Result == SearchNeedExclusiveLock)
{
/* Cleanup state */
ASSERT(CellToRelease2 == HCELL_NIL);
if (CellToRelease)
{
HvReleaseCell(Hive, CellToRelease);
CellToRelease = HCELL_NIL;
}
HvReleaseCell(Hive, Kcb->KeyCell);
/* Try with exclusive KCB lock */
CmpConvertKcbSharedToExclusive(Kcb);
goto DoAgain;
}
else if (Result != SearchSuccess)
{
/* Sanity check */
ASSERT(ValueData == NULL);
/* Release the cells and fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Quickie;
}
/* User data, need SEH */
_SEH2_TRY
{
/* Query the information requested */
Result = CmpQueryKeyValueData(Kcb,
CachedValue,
ValueData,
ValueIsCached,
KeyValueInformationClass,
KeyValueInformation,
Length,
ResultLength,
&Status);
if (Result == SearchNeedExclusiveLock)
{
/* Cleanup state */
if (CellToRelease2) HvReleaseCell(Hive, CellToRelease2);
HvReleaseCell(Hive, Kcb->KeyCell);
if (CellToRelease) HvReleaseCell(Hive, CellToRelease);
/* Try with exclusive KCB lock */
CmpConvertKcbSharedToExclusive(Kcb);
_SEH2_YIELD(goto DoAgain);
}
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Get exception code */
Status = _SEH2_GetExceptionCode();
}
_SEH2_END;
Quickie:
/* If we have a cell to release, do so */
if (CellToRelease != HCELL_NIL) HvReleaseCell(Hive, CellToRelease);
/* Release the parent cell */
HvReleaseCell(Hive, Kcb->KeyCell);
/* If we have a cell to release, do so */
if (CellToRelease2 != HCELL_NIL) HvReleaseCell(Hive, CellToRelease2);
/* Release locks */
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return Status;
}
static
NTSTATUS
CmpQueryKeyDataFromCache(
_In_ PCM_KEY_CONTROL_BLOCK Kcb,
_Out_ PKEY_CACHED_INFORMATION KeyCachedInfo,
_In_ ULONG Length,
_Out_ PULONG ResultLength)
{
PCM_KEY_NODE Node;
PHHIVE KeyHive;
HCELL_INDEX KeyCell;
USHORT NameLength;
PAGED_CODE();
/* Get the hive and cell index */
KeyHive = Kcb->KeyHash.KeyHive;
KeyCell = Kcb->KeyHash.KeyCell;
#if DBG
/* Get the cell node */
Node = (PCM_KEY_NODE)HvGetCell(KeyHive, KeyCell);
if (Node != NULL)
{
ULONG SubKeyCount;
ASSERT(Node->ValueList.Count == Kcb->ValueCache.Count);
if (!(Kcb->ExtFlags & CM_KCB_INVALID_CACHED_INFO))
{
SubKeyCount = Node->SubKeyCounts[0] + Node->SubKeyCounts[1];
if (Kcb->ExtFlags & CM_KCB_NO_SUBKEY)
{
ASSERT(SubKeyCount == 0);
}
else if (Kcb->ExtFlags & CM_KCB_SUBKEY_ONE)
{
ASSERT(SubKeyCount == 1);
}
else if (Kcb->ExtFlags & CM_KCB_SUBKEY_HINT)
{
ASSERT(SubKeyCount == Kcb->IndexHint->Count);
}
else
{
ASSERT(SubKeyCount == Kcb->SubKeyCount);
}
}
ASSERT(Node->LastWriteTime.QuadPart == Kcb->KcbLastWriteTime.QuadPart);
ASSERT(Node->MaxNameLen == Kcb->KcbMaxNameLen);
ASSERT(Node->MaxValueNameLen == Kcb->KcbMaxValueNameLen);
ASSERT(Node->MaxValueDataLen == Kcb->KcbMaxValueDataLen);
/* Release the cell */
HvReleaseCell(KeyHive, KeyCell);
}
#endif // DBG
/* Make sure we have a name block */
if (Kcb->NameBlock == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Check for compressed name */
if (Kcb->NameBlock->Compressed)
{
/* Calculate the name size */
NameLength = CmpCompressedNameSize(Kcb->NameBlock->NameHash.Name,
Kcb->NameBlock->NameHash.NameLength);
}
else
{
/* Use the stored name size */
NameLength = Kcb->NameBlock->NameHash.NameLength;
}
/* Validate buffer length (we do not copy the name!) */
*ResultLength = sizeof(*KeyCachedInfo);
if (Length < *ResultLength)
{
return STATUS_BUFFER_TOO_SMALL;
}
/* Fill the structure */
KeyCachedInfo->LastWriteTime = Kcb->KcbLastWriteTime;
KeyCachedInfo->TitleIndex = 0;
KeyCachedInfo->NameLength = NameLength;
KeyCachedInfo->Values = Kcb->ValueCache.Count;
KeyCachedInfo->MaxNameLen = Kcb->KcbMaxNameLen;
KeyCachedInfo->MaxValueNameLen = Kcb->KcbMaxValueNameLen;
KeyCachedInfo->MaxValueDataLen = Kcb->KcbMaxValueDataLen;
/* Check the ExtFlags for what we have */
if (Kcb->ExtFlags & CM_KCB_INVALID_CACHED_INFO)
{
/* Cache is not valid, do a full lookup */
DPRINT1("Kcb cache incoherency detected, kcb = %p\n", Kcb);
/* Get the cell node */
Node = (PCM_KEY_NODE)HvGetCell(KeyHive, KeyCell);
if (Node == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Calculate number of subkeys */
KeyCachedInfo->SubKeys = Node->SubKeyCounts[0] + Node->SubKeyCounts[1];
/* Release the cell */
HvReleaseCell(KeyHive, KeyCell);
}
else if (Kcb->ExtFlags & CM_KCB_NO_SUBKEY)
{
/* There are no subkeys */
KeyCachedInfo->SubKeys = 0;
}
else if (Kcb->ExtFlags & CM_KCB_SUBKEY_ONE)
{
/* There is exactly one subley */
KeyCachedInfo->SubKeys = 1;
}
else if (Kcb->ExtFlags & CM_KCB_SUBKEY_HINT)
{
/* Get the number of subkeys from the subkey hint */
KeyCachedInfo->SubKeys = Kcb->IndexHint->Count;
}
else
{
/* No subkey hint, use the key count field */
KeyCachedInfo->SubKeys = Kcb->SubKeyCount;
}
return STATUS_SUCCESS;
}
static
NTSTATUS
CmpQueryFlagsInformation(
_In_ PCM_KEY_CONTROL_BLOCK Kcb,
_Out_ PKEY_USER_FLAGS_INFORMATION KeyFlagsInfo,
_In_ ULONG Length,
_In_ PULONG ResultLength)
{
/* Validate the buffer size */
*ResultLength = sizeof(*KeyFlagsInfo);
if (Length < *ResultLength)
{
return STATUS_BUFFER_TOO_SMALL;
}
/* Copy the user flags */
KeyFlagsInfo->UserFlags = Kcb->KcbUserFlags;
return STATUS_SUCCESS;
}
static
NTSTATUS
CmpQueryNameInformation(
_In_ PCM_KEY_CONTROL_BLOCK Kcb,
_Out_opt_ PKEY_NAME_INFORMATION KeyNameInfo,
_In_ ULONG Length,
_Out_ PULONG ResultLength)
{
ULONG NeededLength;
PCM_KEY_CONTROL_BLOCK CurrentKcb;
NeededLength = 0;
CurrentKcb = Kcb;
/* Count the needed buffer size */
while (CurrentKcb)
{
if (CurrentKcb->NameBlock->Compressed)
NeededLength += CmpCompressedNameSize(CurrentKcb->NameBlock->Name, CurrentKcb->NameBlock->NameLength);
else
NeededLength += CurrentKcb->NameBlock->NameLength;
NeededLength += sizeof(OBJ_NAME_PATH_SEPARATOR);
CurrentKcb = CurrentKcb->ParentKcb;
}
_SEH2_TRY
{
*ResultLength = FIELD_OFFSET(KEY_NAME_INFORMATION, Name) + NeededLength;
if (Length < RTL_SIZEOF_THROUGH_FIELD(KEY_NAME_INFORMATION, NameLength))
_SEH2_YIELD(return STATUS_BUFFER_TOO_SMALL);
if (Length < *ResultLength)
{
KeyNameInfo->NameLength = NeededLength;
_SEH2_YIELD(return STATUS_BUFFER_OVERFLOW);
}
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
/* Do the real copy */
KeyNameInfo->NameLength = 0;
CurrentKcb = Kcb;
_SEH2_TRY
{
while (CurrentKcb)
{
ULONG NameLength;
if (CurrentKcb->NameBlock->Compressed)
{
NameLength = CmpCompressedNameSize(CurrentKcb->NameBlock->Name, CurrentKcb->NameBlock->NameLength);
/* Copy the compressed name */
CmpCopyCompressedName(&KeyNameInfo->Name[(NeededLength - NameLength)/sizeof(WCHAR)],
NameLength,
CurrentKcb->NameBlock->Name,
CurrentKcb->NameBlock->NameLength);
}
else
{
NameLength = CurrentKcb->NameBlock->NameLength;
/* Otherwise, copy the raw name */
RtlCopyMemory(&KeyNameInfo->Name[(NeededLength - NameLength)/sizeof(WCHAR)],
CurrentKcb->NameBlock->Name,
NameLength);
}
NeededLength -= NameLength;
NeededLength -= sizeof(OBJ_NAME_PATH_SEPARATOR);
/* Add path separator */
KeyNameInfo->Name[NeededLength/sizeof(WCHAR)] = OBJ_NAME_PATH_SEPARATOR;
KeyNameInfo->NameLength += NameLength + sizeof(OBJ_NAME_PATH_SEPARATOR);
CurrentKcb = CurrentKcb->ParentKcb;
}
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
/* Make sure we copied everything */
ASSERT(NeededLength == 0);
ASSERT(KeyNameInfo->Name[0] == OBJ_NAME_PATH_SEPARATOR);
/* We're done */
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
CmQueryKey(_In_ PCM_KEY_CONTROL_BLOCK Kcb,
_In_ KEY_INFORMATION_CLASS KeyInformationClass,
_Out_opt_ PVOID KeyInformation,
_In_ ULONG Length,
_Out_ PULONG ResultLength)
{
NTSTATUS Status;
PHHIVE Hive;
PCM_KEY_NODE Parent;
HV_TRACK_CELL_REF CellReferences = {0};
/* Acquire hive lock */
CmpLockRegistry();
/* Lock KCB shared */
CmpAcquireKcbLockShared(Kcb);
/* Don't touch deleted keys */
if (Kcb->Delete)
{
/* Fail */
Status = STATUS_KEY_DELETED;
goto Quickie;
}
/* Data can be user-mode, use SEH */
_SEH2_TRY
{
/* Check what class we got */
switch (KeyInformationClass)
{
/* Typical information */
case KeyFullInformation:
case KeyBasicInformation:
case KeyNodeInformation:
{
/* Get the hive and parent */
Hive = Kcb->KeyHive;
Parent = (PCM_KEY_NODE)HvGetCell(Hive, Kcb->KeyCell);
ASSERT(Parent);
/* Track cell references */
if (!HvTrackCellRef(&CellReferences, Hive, Kcb->KeyCell))
{
/* Not enough memory to track references */
Status = STATUS_INSUFFICIENT_RESOURCES;
}
else
{
/* Call the internal API */
Status = CmpQueryKeyData(Hive,
Parent,
KeyInformationClass,
KeyInformation,
Length,
ResultLength);
}
break;
}
case KeyCachedInformation:
{
/* Call the internal API */
Status = CmpQueryKeyDataFromCache(Kcb,
KeyInformation,
Length,
ResultLength);
break;
}
case KeyFlagsInformation:
{
/* Call the internal API */
Status = CmpQueryFlagsInformation(Kcb,
KeyInformation,
Length,
ResultLength);
break;
}
case KeyNameInformation:
{
/* Call the internal API */
Status = CmpQueryNameInformation(Kcb,
KeyInformation,
Length,
ResultLength);
break;
}
/* Illegal classes */
default:
{
/* Print message and fail */
DPRINT1("Unsupported class: %d!\n", KeyInformationClass);
Status = STATUS_INVALID_INFO_CLASS;
break;
}
}
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Fail with exception code */
Status = _SEH2_GetExceptionCode();
_SEH2_YIELD(goto Quickie);
}
_SEH2_END;
Quickie:
/* Release references */
HvReleaseFreeCellRefArray(&CellReferences);
/* Release locks */
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return Status;
}
NTSTATUS
NTAPI
CmEnumerateKey(IN PCM_KEY_CONTROL_BLOCK Kcb,
IN ULONG Index,
IN KEY_INFORMATION_CLASS KeyInformationClass,
IN PVOID KeyInformation,
IN ULONG Length,
IN PULONG ResultLength)
{
NTSTATUS Status;
PHHIVE Hive;
PCM_KEY_NODE Parent, Child;
HCELL_INDEX ChildCell;
HV_TRACK_CELL_REF CellReferences = {0};
/* Acquire hive lock */
CmpLockRegistry();
/* Lock the KCB shared */
CmpAcquireKcbLockShared(Kcb);
/* Don't touch deleted keys */
if (Kcb->Delete)
{
/* Undo everything */
Status = STATUS_KEY_DELETED;
goto Quickie;
}
/* Get the hive and parent */
Hive = Kcb->KeyHive;
Parent = (PCM_KEY_NODE)HvGetCell(Hive, Kcb->KeyCell);
ASSERT(Parent);
/* Get the child cell */
ChildCell = CmpFindSubKeyByNumber(Hive, Parent, Index);
/* Release the parent cell */
HvReleaseCell(Hive, Kcb->KeyCell);
/* Check if we found the child */
if (ChildCell == HCELL_NIL)
{
/* We didn't, fail */
Status = STATUS_NO_MORE_ENTRIES;
goto Quickie;
}
/* Now get the actual child node */
Child = (PCM_KEY_NODE)HvGetCell(Hive, ChildCell);
ASSERT(Child);
/* Track references */
if (!HvTrackCellRef(&CellReferences, Hive, ChildCell))
{
/* Can't allocate memory for tracking */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Quickie;
}
/* Data can be user-mode, use SEH */
_SEH2_TRY
{
/* Query the data requested */
Status = CmpQueryKeyData(Hive,
Child,
KeyInformationClass,
KeyInformation,
Length,
ResultLength);
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
/* Fail with exception code */
Status = _SEH2_GetExceptionCode();
_SEH2_YIELD(goto Quickie);
}
_SEH2_END;
Quickie:
/* Release references */
HvReleaseFreeCellRefArray(&CellReferences);
/* Release locks */
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return Status;
}
NTSTATUS
NTAPI
CmDeleteKey(IN PCM_KEY_BODY KeyBody)
{
NTSTATUS Status;
PHHIVE Hive;
PCM_KEY_NODE Node, Parent;
HCELL_INDEX Cell, ParentCell;
PCM_KEY_CONTROL_BLOCK Kcb;
/* Acquire hive lock */
CmpLockRegistry();
/* Get the kcb */
Kcb = KeyBody->KeyControlBlock;
/* Don't allow deleting the root */
if (!Kcb->ParentKcb)
{
/* Fail */
CmpUnlockRegistry();
return STATUS_CANNOT_DELETE;
}
/* Lock parent and child */
CmpAcquireTwoKcbLocksExclusiveByKey(Kcb->ConvKey, Kcb->ParentKcb->ConvKey);
/* Check if we're already being deleted */
if (Kcb->Delete)
{
/* Don't do it twice */
Status = STATUS_SUCCESS;
goto Quickie;
}
/* Get the hive and node */
Hive = Kcb->KeyHive;
Cell = Kcb->KeyCell;
/* Lock flushes */
CmpLockHiveFlusherShared((PCMHIVE)Hive);
/* Get the key node */
Node = (PCM_KEY_NODE)HvGetCell(Hive, Cell);
ASSERT(Node);
/* Sanity check */
ASSERT(Node->Flags == Kcb->Flags);
/* Check if we don't have any children */
if (!(Node->SubKeyCounts[Stable] + Node->SubKeyCounts[Volatile]) &&
!(Node->Flags & KEY_NO_DELETE))
{
/* Send notification to registered callbacks */
CmpReportNotify(Kcb, Hive, Cell, REG_NOTIFY_CHANGE_NAME);
/* Get the parent and free the cell */
ParentCell = Node->Parent;
Status = CmpFreeKeyByCell(Hive, Cell, TRUE);
if (NT_SUCCESS(Status))
{
/* Flush any notifications */
CmpFlushNotifiesOnKeyBodyList(Kcb, FALSE);
/* Clean up information we have on the subkey */
CmpCleanUpSubKeyInfo(Kcb->ParentKcb);
/* Get the parent node */
Parent = (PCM_KEY_NODE)HvGetCell(Hive, ParentCell);
if (Parent)
{
/* Update the maximum name length */
Kcb->ParentKcb->KcbMaxNameLen = (USHORT)Parent->MaxNameLen;
/* Make sure we're dirty */
ASSERT(HvIsCellDirty(Hive, ParentCell));
/* Update the write time */
KeQuerySystemTime(&Parent->LastWriteTime);
Kcb->ParentKcb->KcbLastWriteTime = Parent->LastWriteTime;
/* Release the cell */
HvReleaseCell(Hive, ParentCell);
}
/* Set the KCB in delete mode and remove it */
Kcb->Delete = TRUE;
CmpRemoveKeyControlBlock(Kcb);
/* Clear the cell */
Kcb->KeyCell = HCELL_NIL;
}
}
else
{
/* Fail */
Status = STATUS_CANNOT_DELETE;
}
/* Release the cell */
HvReleaseCell(Hive, Cell);
/* Release flush lock */
CmpUnlockHiveFlusher((PCMHIVE)Hive);
/* Release the KCB locks */
Quickie:
CmpReleaseTwoKcbLockByKey(Kcb->ConvKey, Kcb->ParentKcb->ConvKey);
/* Release hive lock */
CmpUnlockRegistry();
return Status;
}
NTSTATUS
NTAPI
CmFlushKey(IN PCM_KEY_CONTROL_BLOCK Kcb,
IN BOOLEAN ExclusiveLock)
{
PCMHIVE CmHive;
#if DBG
CM_CHECK_REGISTRY_STATUS CheckStatus;
#endif
NTSTATUS Status = STATUS_SUCCESS;
PHHIVE Hive;
/* Ignore flushes until we're ready */
if (CmpNoWrite) return STATUS_SUCCESS;
/* Get the hives */
Hive = Kcb->KeyHive;
CmHive = (PCMHIVE)Hive;
/* Check if this is the master hive */
if (CmHive == CmiVolatileHive)
{
/* Flush all the hives instead */
CmpDoFlushAll(FALSE);
}
else
{
#if DBG
/* Make sure the registry hive we're going to flush is OK */
CheckStatus = CmCheckRegistry(CmHive, CM_CHECK_REGISTRY_DONT_PURGE_VOLATILES | CM_CHECK_REGISTRY_VALIDATE_HIVE);
ASSERT(CM_CHECK_REGISTRY_SUCCESS(CheckStatus));
#endif
/* Don't touch the hive */
CmpLockHiveFlusherExclusive(CmHive);
ASSERT(CmHive->ViewLock);
KeAcquireGuardedMutex(CmHive->ViewLock);
CmHive->ViewLockOwner = KeGetCurrentThread();
/* Will the hive shrink? */
if (HvHiveWillShrink(Hive))
{
/* I don't believe the current Hv does shrinking */
ASSERT(FALSE);
// CMP_ASSERT_EXCLUSIVE_REGISTRY_LOCK_OR_LOADING(CmHive);
}
else
{
/* Now we can release views */
ASSERT(CmHive->ViewLock);
// CMP_ASSERT_VIEW_LOCK_OWNED(CmHive);
ASSERT((CmpSpecialBootCondition == TRUE) ||
(CmHive->HiveIsLoading == TRUE) ||
(CmHive->ViewLockOwner == KeGetCurrentThread()) ||
(CmpTestRegistryLockExclusive() == TRUE));
CmHive->ViewLockOwner = NULL;
KeReleaseGuardedMutex(CmHive->ViewLock);
}
/* Flush only this hive */
if (!HvSyncHive(Hive))
{
/* Fail */
Status = STATUS_REGISTRY_IO_FAILED;
}
/* Release the flush lock */
CmpUnlockHiveFlusher(CmHive);
}
/* Return the status */
return Status;
}
NTSTATUS
NTAPI
CmLoadKey(IN POBJECT_ATTRIBUTES TargetKey,
IN POBJECT_ATTRIBUTES SourceFile,
IN ULONG Flags,
IN PCM_KEY_BODY KeyBody)
{
SECURITY_QUALITY_OF_SERVICE ServiceQos;
SECURITY_CLIENT_CONTEXT ClientSecurityContext;
HANDLE KeyHandle;
BOOLEAN Allocate = TRUE;
PCMHIVE CmHive, LoadedHive;
NTSTATUS Status;
CM_PARSE_CONTEXT ParseContext;
/* Check if we have a trust key */
if (KeyBody)
{
/* Fail */
DPRINT("Trusted classes not yet supported\n");
}
/* Build a service QoS for a security context */
ServiceQos.Length = sizeof(SECURITY_QUALITY_OF_SERVICE);
ServiceQos.ImpersonationLevel = SecurityImpersonation;
ServiceQos.ContextTrackingMode = SECURITY_DYNAMIC_TRACKING;
ServiceQos.EffectiveOnly = TRUE;
Status = SeCreateClientSecurity(PsGetCurrentThread(),
&ServiceQos,
FALSE,
&ClientSecurityContext);
if (!NT_SUCCESS(Status))
{
/* Fail */
DPRINT1("Security context failed\n");
return Status;
}
/* Open the target key */
RtlZeroMemory(&ParseContext, sizeof(ParseContext));
ParseContext.CreateOperation = FALSE;
Status = ObOpenObjectByName(TargetKey,
CmpKeyObjectType,
KernelMode,
NULL,
KEY_READ,
&ParseContext,
&KeyHandle);
if (!NT_SUCCESS(Status)) KeyHandle = NULL;
/* Open the hive */
Status = CmpCmdHiveOpen(SourceFile,
&ClientSecurityContext,
&Allocate,
&CmHive,
CM_CHECK_REGISTRY_PURGE_VOLATILES);
/* Get rid of the security context */
SeDeleteClientSecurity(&ClientSecurityContext);
/* See if we failed */
if (!NT_SUCCESS(Status))
{
/* See if the target already existed */
if (KeyHandle)
{
/* Lock the registry */
CmpLockRegistryExclusive();
/* Check if we are already loaded */
if (CmpIsHiveAlreadyLoaded(KeyHandle, SourceFile, &LoadedHive))
{
/* That's okay then */
ASSERT(LoadedHive);
Status = STATUS_SUCCESS;
}
/* Release the registry */
CmpUnlockRegistry();
}
/* Close the key handle if we had one */
if (KeyHandle) ZwClose(KeyHandle);
return Status;
}
/* Lock the registry shared */
CmpLockRegistry();
/* Lock loading */
ExAcquirePushLockExclusive(&CmpLoadHiveLock);
/* Lock the hive to this thread */
CmHive->Hive.HiveFlags |= HIVE_IS_UNLOADING;
CmHive->CreatorOwner = KeGetCurrentThread();
/* Set flag */
if (Flags & REG_NO_LAZY_FLUSH) CmHive->Hive.HiveFlags |= HIVE_NOLAZYFLUSH;
/* Link the hive */
Status = CmpLinkHiveToMaster(TargetKey->ObjectName,
TargetKey->RootDirectory,
CmHive,
Allocate,
TargetKey->SecurityDescriptor);
if (NT_SUCCESS(Status))
{
/* Add to HiveList key */
CmpAddToHiveFileList(CmHive);
/* Sync the hive if necessary */
if (Allocate)
{
/* Sync it under the flusher lock */
CmpLockHiveFlusherExclusive(CmHive);
HvSyncHive(&CmHive->Hive);
CmpUnlockHiveFlusher(CmHive);
}
/* Release the hive */
CmHive->Hive.HiveFlags &= ~HIVE_IS_UNLOADING;
CmHive->CreatorOwner = NULL;
}
else
{
DPRINT1("CmpLinkHiveToMaster failed, Status %lx\n", Status);
/* We're touching this hive, set the loading flag */
CmHive->HiveIsLoading = TRUE;
/* Close associated file handles */
CmpCloseHiveFiles(CmHive);
/* Cleanup its resources */
CmpDestroyHive(CmHive);
}
/* Allow loads */
ExReleasePushLock(&CmpLoadHiveLock);
/* Is this first profile load? */
if (!CmpProfileLoaded && !CmpWasSetupBoot)
{
/* User is now logged on, set quotas */
CmpProfileLoaded = TRUE;
CmpSetGlobalQuotaAllowed();
}
/* Unlock the registry */
CmpUnlockRegistry();
/* Close handle and return */
if (KeyHandle) ZwClose(KeyHandle);
return Status;
}
static
BOOLEAN
NTAPI
CmpUnlinkHiveFromMaster(IN PCMHIVE CmHive,
IN HCELL_INDEX Cell)
{
PCELL_DATA CellData;
HCELL_INDEX LinkCell;
NTSTATUS Status;
DPRINT("CmpUnlinkHiveFromMaster()\n");
/* Get the cell data */
CellData = HvGetCell(&CmHive->Hive, Cell);
if (CellData == NULL)
return FALSE;
/* Get the link cell and release the current cell */
LinkCell = CellData->u.KeyNode.Parent;
HvReleaseCell(&CmHive->Hive, Cell);
/* Remove the link cell from the master hive */
CmpLockHiveFlusherExclusive(CmiVolatileHive);
Status = CmpFreeKeyByCell((PHHIVE)CmiVolatileHive,
LinkCell,
TRUE);
CmpUnlockHiveFlusher(CmiVolatileHive);
if (!NT_SUCCESS(Status))
{
DPRINT1("CmpFreeKeyByCell() failed (Status 0x%08lx)\n", Status);
return FALSE;
}
/* Remove the hive from the list */
ExAcquirePushLockExclusive(&CmpHiveListHeadLock);
RemoveEntryList(&CmHive->HiveList);
ExReleasePushLock(&CmpHiveListHeadLock);
return TRUE;
}
NTSTATUS
NTAPI
CmUnloadKey(
_In_ PCM_KEY_CONTROL_BLOCK Kcb,
_In_ ULONG Flags)
{
PHHIVE Hive;
PCMHIVE CmHive;
HCELL_INDEX Cell;
DPRINT("CmUnloadKey(%p, %lx)\n", Kcb, Flags);
/* Ensure the registry is locked exclusively for the calling thread */
CMP_ASSERT_EXCLUSIVE_REGISTRY_LOCK();
/* Get the hive */
Hive = Kcb->KeyHive;
Cell = Kcb->KeyCell;
CmHive = (PCMHIVE)Hive;
/* Fail if the key is not a hive root key */
if (Cell != Hive->BaseBlock->RootCell)
{
DPRINT1("Key is not a hive root key!\n");
return STATUS_INVALID_PARAMETER;
}
/* Fail if we try to unload the master hive */
if (CmHive == CmiVolatileHive)
{
DPRINT1("Do not try to unload the master hive!\n");
return STATUS_INVALID_PARAMETER;
}
/* Mark this hive as being unloaded */
Hive->HiveFlags |= HIVE_IS_UNLOADING;
/* Search for any opened keys in this hive, and take an appropriate action */
if (Kcb->RefCount > 1)
{
if (Flags != REG_FORCE_UNLOAD)
{
if (CmpEnumerateOpenSubKeys(Kcb, TRUE, FALSE) != 0)
{
/* There are open subkeys but we don't force hive unloading, fail */
Hive->HiveFlags &= ~HIVE_IS_UNLOADING;
return STATUS_CANNOT_DELETE;
}
}
else
{
if (CmpEnumerateOpenSubKeys(Kcb, TRUE, TRUE) != 0)
{
/* There are open subkeys that we cannot force to unload, fail */
Hive->HiveFlags &= ~HIVE_IS_UNLOADING;
return STATUS_CANNOT_DELETE;
}
}
}
/* Set the loading flag */
CmHive->HiveIsLoading = TRUE;
/* Flush the hive */
CmFlushKey(Kcb, TRUE);
/* Unlink the hive from the master hive */
if (!CmpUnlinkHiveFromMaster(CmHive, Cell))
{
DPRINT("CmpUnlinkHiveFromMaster() failed!\n");
/* Remove the unloading flag */
Hive->HiveFlags &= ~HIVE_IS_UNLOADING;
/* Reset the loading flag */
CmHive->HiveIsLoading = FALSE;
/* Return failure */
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Flush any notifications if we force hive unloading */
if (Flags == REG_FORCE_UNLOAD)
CmpFlushNotifiesOnKeyBodyList(Kcb, TRUE); // Lock is already held
/* Clean up information we have on the subkey */
CmpCleanUpSubKeyInfo(Kcb->ParentKcb);
/* Set the KCB in delete mode and remove it */
Kcb->Delete = TRUE;
CmpRemoveKeyControlBlock(Kcb);
/* Release the hive loading lock */
ExReleasePushLockExclusive(&CmpLoadHiveLock);
/* Release hive lock */
CmpUnlockRegistry();
/* Close file handles */
CmpCloseHiveFiles(CmHive);
/* Remove the hive from the hive file list */
CmpRemoveFromHiveFileList(CmHive);
/**
** NOTE:
** The following code is mostly equivalent to what we "call" CmpDestroyHive()
**/
/* Destroy the security descriptor cache */
CmpDestroySecurityCache(CmHive);
/* Destroy the view list */
CmpDestroyHiveViewList(CmHive);
/* Delete the flusher lock */
ExDeleteResourceLite(CmHive->FlusherLock);
ExFreePoolWithTag(CmHive->FlusherLock, TAG_CMHIVE);
/* Delete the view lock */
ExFreePoolWithTag(CmHive->ViewLock, TAG_CMHIVE);
/* Free the hive storage */
HvFree(Hive);
/* Free the hive */
CmpFree(CmHive, TAG_CM);
return STATUS_SUCCESS;
}
ULONG
NTAPI
CmpEnumerateOpenSubKeys(
_In_ PCM_KEY_CONTROL_BLOCK RootKcb,
_In_ BOOLEAN RemoveEmptyCacheEntries,
_In_ BOOLEAN DereferenceOpenedEntries)
{
PCM_KEY_HASH Entry;
PCM_KEY_CONTROL_BLOCK CachedKcb;
PCM_KEY_CONTROL_BLOCK ParentKcb;
ULONG ParentKeyCount;
ULONG i, j;
ULONG SubKeys = 0;
DPRINT("CmpEnumerateOpenSubKeys() called\n");
/* Ensure the registry is locked exclusively for the calling thread */
CMP_ASSERT_EXCLUSIVE_REGISTRY_LOCK();
/* The root key is the only referenced key. There are no referenced sub keys. */
if (RootKcb->RefCount == 1)
{
DPRINT("Open sub keys: 0\n");
return 0;
}
/* Enumerate all hash lists */
for (i = 0; i < CmpHashTableSize; i++)
{
/* Get the first cache entry */
Entry = CmpCacheTable[i].Entry;
/* Enumerate all cache entries */
while (Entry)
{
/* Get the KCB of the current cache entry */
CachedKcb = CONTAINING_RECORD(Entry, CM_KEY_CONTROL_BLOCK, KeyHash);
/* Check keys only that are subkeys to our root key */
if (CachedKcb->TotalLevels > RootKcb->TotalLevels)
{
/* Calculate the number of parent keys to the root key */
ParentKeyCount = CachedKcb->TotalLevels - RootKcb->TotalLevels;
/* Find a parent key that could be the root key */
ParentKcb = CachedKcb;
for (j = 0; j < ParentKeyCount; j++)
{
ParentKcb = ParentKcb->ParentKcb;
}
/* Check whether the parent is the root key */
if (ParentKcb == RootKcb)
{
DPRINT("Found a sub key, RefCount = %u\n", CachedKcb->RefCount);
if (CachedKcb->RefCount > 0)
{
DPRINT("Found a sub key pointing to '%.*s', RefCount = %u\n",
CachedKcb->NameBlock->NameLength, CachedKcb->NameBlock->Name,
CachedKcb->RefCount);
/* If we dereference opened KCBs, don't touch read-only keys */
if (DereferenceOpenedEntries &&
!(CachedKcb->ExtFlags & CM_KCB_READ_ONLY_KEY))
{
/* Flush any notifications */
CmpFlushNotifiesOnKeyBodyList(CachedKcb, TRUE); // Lock is already held
/* Clean up information we have on the subkey */
CmpCleanUpSubKeyInfo(CachedKcb->ParentKcb);
/* Get and cache the next cache entry */
// Entry = Entry->NextHash;
Entry = CachedKcb->NextHash;
/* Set the KCB in delete mode and remove it */
CachedKcb->Delete = TRUE;
CmpRemoveKeyControlBlock(CachedKcb);
/* Clear the cell */
CachedKcb->KeyCell = HCELL_NIL;
/* Restart with the next cache entry */
continue;
}
/* Else, the key cannot be dereferenced, and we count it as in use */
/* Count the current hash entry if it is in use */
SubKeys++;
}
else if ((CachedKcb->RefCount == 0) && RemoveEmptyCacheEntries)
{
/* Remove the current key from the delayed close list */
CmpRemoveFromDelayedClose(CachedKcb);
/* Remove the current cache entry */
CmpCleanUpKcbCacheWithLock(CachedKcb, TRUE);
/* Restart, because the hash list has changed */
Entry = CmpCacheTable[i].Entry;
continue;
}
}
}
/* Get the next cache entry */
Entry = Entry->NextHash;
}
}
if (SubKeys > 0)
DPRINT1("Open sub keys: %u\n", SubKeys);
return SubKeys;
}
static
NTSTATUS
CmpDeepCopyKeyInternal(IN PHHIVE SourceHive,
IN HCELL_INDEX SrcKeyCell,
IN PHHIVE DestinationHive,
IN HCELL_INDEX Parent,
IN HSTORAGE_TYPE StorageType,
OUT PHCELL_INDEX DestKeyCell OPTIONAL)
{
NTSTATUS Status;
PCM_KEY_NODE SrcNode;
PCM_KEY_NODE DestNode = NULL;
HCELL_INDEX NewKeyCell = HCELL_NIL;
HCELL_INDEX NewClassCell = HCELL_NIL, NewSecCell = HCELL_NIL;
HCELL_INDEX SubKey, NewSubKey;
ULONG Index, SubKeyCount;
PAGED_CODE();
DPRINT("CmpDeepCopyKeyInternal(0x%08X, 0x%08X, 0x%08X, 0x%08X, 0x%08X, 0x%08X)\n",
SourceHive,
SrcKeyCell,
DestinationHive,
Parent,
StorageType,
DestKeyCell);
/* Get the source cell node */
SrcNode = (PCM_KEY_NODE)HvGetCell(SourceHive, SrcKeyCell);
ASSERT(SrcNode);
/* Sanity check */
ASSERT(SrcNode->Signature == CM_KEY_NODE_SIGNATURE);
/* Create a simple copy of the source key */
NewKeyCell = CmpCopyCell(SourceHive,
SrcKeyCell,
DestinationHive,
StorageType);
if (NewKeyCell == HCELL_NIL)
{
/* Not enough storage space */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Cleanup;
}
/* Get the destination cell node */
DestNode = (PCM_KEY_NODE)HvGetCell(DestinationHive, NewKeyCell);
ASSERT(DestNode);
/* Set the parent and copy the flags */
DestNode->Parent = Parent;
DestNode->Flags = (SrcNode->Flags & KEY_COMP_NAME); // Keep only the single permanent flag
if (Parent == HCELL_NIL)
{
/* This is the new root node */
DestNode->Flags |= KEY_HIVE_ENTRY | KEY_NO_DELETE;
}
/* Copy the class cell */
if (SrcNode->ClassLength > 0)
{
NewClassCell = CmpCopyCell(SourceHive,
SrcNode->Class,
DestinationHive,
StorageType);
if (NewClassCell == HCELL_NIL)
{
/* Not enough storage space */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Cleanup;
}
DestNode->Class = NewClassCell;
DestNode->ClassLength = SrcNode->ClassLength;
}
else
{
DestNode->Class = HCELL_NIL;
DestNode->ClassLength = 0;
}
/* Copy the security cell (FIXME: HACKish poor-man version) */
if (SrcNode->Security != HCELL_NIL)
{
NewSecCell = CmpCopyCell(SourceHive,
SrcNode->Security,
DestinationHive,
StorageType);
if (NewSecCell == HCELL_NIL)
{
/* Not enough storage space */
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Cleanup;
}
}
DestNode->Security = NewSecCell;
/* Copy the value list */
Status = CmpCopyKeyValueList(SourceHive,
&SrcNode->ValueList,
DestinationHive,
&DestNode->ValueList,
StorageType);
if (!NT_SUCCESS(Status))
goto Cleanup;
/* Clear the invalid subkey index */
DestNode->SubKeyCounts[Stable] = DestNode->SubKeyCounts[Volatile] = 0;
DestNode->SubKeyLists[Stable] = DestNode->SubKeyLists[Volatile] = HCELL_NIL;
/* Calculate the total number of subkeys */
SubKeyCount = SrcNode->SubKeyCounts[Stable] + SrcNode->SubKeyCounts[Volatile];
/* Loop through all the subkeys */
for (Index = 0; Index < SubKeyCount; Index++)
{
/* Get the subkey */
SubKey = CmpFindSubKeyByNumber(SourceHive, SrcNode, Index);
ASSERT(SubKey != HCELL_NIL);
/* Call the function recursively for the subkey */
//
// FIXME: Danger!! Kernel stack exhaustion!!
//
Status = CmpDeepCopyKeyInternal(SourceHive,
SubKey,
DestinationHive,
NewKeyCell,
StorageType,
&NewSubKey);
if (!NT_SUCCESS(Status))
goto Cleanup;
/* Add the copy of the subkey to the new key */
if (!CmpAddSubKey(DestinationHive,
NewKeyCell,
NewSubKey))
{
/* Cleanup allocated cell */
HvFreeCell(DestinationHive, NewSubKey);
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Cleanup;
}
}
/* Set success */
Status = STATUS_SUCCESS;
Cleanup:
/* Release the cells */
if (DestNode) HvReleaseCell(DestinationHive, NewKeyCell);
if (SrcNode) HvReleaseCell(SourceHive, SrcKeyCell);
/* Cleanup allocated cells in case of failure */
if (!NT_SUCCESS(Status))
{
if (NewSecCell != HCELL_NIL)
HvFreeCell(DestinationHive, NewSecCell);
if (NewClassCell != HCELL_NIL)
HvFreeCell(DestinationHive, NewClassCell);
if (NewKeyCell != HCELL_NIL)
HvFreeCell(DestinationHive, NewKeyCell);
NewKeyCell = HCELL_NIL;
}
/* Set the cell index if requested and return status */
if (DestKeyCell) *DestKeyCell = NewKeyCell;
return Status;
}
NTSTATUS
NTAPI
CmpDeepCopyKey(IN PHHIVE SourceHive,
IN HCELL_INDEX SrcKeyCell,
IN PHHIVE DestinationHive,
IN HSTORAGE_TYPE StorageType,
OUT PHCELL_INDEX DestKeyCell OPTIONAL)
{
/* Call the internal function */
return CmpDeepCopyKeyInternal(SourceHive,
SrcKeyCell,
DestinationHive,
HCELL_NIL,
StorageType,
DestKeyCell);
}
NTSTATUS
NTAPI
CmSaveKey(IN PCM_KEY_CONTROL_BLOCK Kcb,
IN HANDLE FileHandle,
IN ULONG Flags)
{
#if DBG
CM_CHECK_REGISTRY_STATUS CheckStatus;
PCMHIVE HiveToValidate = NULL;
#endif
NTSTATUS Status = STATUS_SUCCESS;
PCMHIVE KeyHive = NULL;
PAGED_CODE();
DPRINT("CmSaveKey(0x%08X, 0x%08X, %lu)\n", Kcb, FileHandle, Flags);
/* Lock the registry and KCB */
CmpLockRegistry();
CmpAcquireKcbLockShared(Kcb);
#if DBG
/* Get the hive for validation */
HiveToValidate = (PCMHIVE)Kcb->KeyHive;
#endif
if (Kcb->Delete)
{
/* The source key has been deleted, do nothing */
Status = STATUS_KEY_DELETED;
goto Cleanup;
}
if (Kcb->KeyHive == &CmiVolatileHive->Hive)
{
/* Keys that are directly in the master hive can't be saved */
Status = STATUS_ACCESS_DENIED;
goto Cleanup;
}
#if DBG
/* Make sure this control block has a sane hive */
CheckStatus = CmCheckRegistry(HiveToValidate, CM_CHECK_REGISTRY_DONT_PURGE_VOLATILES | CM_CHECK_REGISTRY_VALIDATE_HIVE);
ASSERT(CM_CHECK_REGISTRY_SUCCESS(CheckStatus));
#endif
/* Create a new hive that will hold the key */
Status = CmpInitializeHive(&KeyHive,
HINIT_CREATE,
HIVE_VOLATILE,
HFILE_TYPE_PRIMARY,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
CM_CHECK_REGISTRY_DONT_PURGE_VOLATILES);
if (!NT_SUCCESS(Status)) goto Cleanup;
/* Copy the key recursively into the new hive */
Status = CmpDeepCopyKey(Kcb->KeyHive,
Kcb->KeyCell,
&KeyHive->Hive,
Stable,
&KeyHive->Hive.BaseBlock->RootCell);
if (!NT_SUCCESS(Status)) goto Cleanup;
/* Set the primary handle of the hive */
KeyHive->FileHandles[HFILE_TYPE_PRIMARY] = FileHandle;
/* Dump the hive into the file */
HvWriteHive(&KeyHive->Hive);
Cleanup:
/* Free the hive */
if (KeyHive) CmpDestroyHive(KeyHive);
#if DBG
if (NT_SUCCESS(Status))
{
/* Before we say goodbye, make sure the hive is still OK */
CheckStatus = CmCheckRegistry(HiveToValidate, CM_CHECK_REGISTRY_DONT_PURGE_VOLATILES | CM_CHECK_REGISTRY_VALIDATE_HIVE);
ASSERT(CM_CHECK_REGISTRY_SUCCESS(CheckStatus));
}
#endif
/* Release the locks */
CmpReleaseKcbLock(Kcb);
CmpUnlockRegistry();
return Status;
}
NTSTATUS
NTAPI
CmSaveMergedKeys(IN PCM_KEY_CONTROL_BLOCK HighKcb,
IN PCM_KEY_CONTROL_BLOCK LowKcb,
IN HANDLE FileHandle)
{
#if DBG
CM_CHECK_REGISTRY_STATUS CheckStatus;
PCMHIVE LowHiveToValidate = NULL;
PCMHIVE HighHiveToValidate = NULL;
#endif
PCMHIVE KeyHive = NULL;
NTSTATUS Status = STATUS_SUCCESS;
PAGED_CODE();
DPRINT("CmSaveKey(%p, %p, %p)\n", HighKcb, LowKcb, FileHandle);
/* Lock the registry and the KCBs */
CmpLockRegistry();
CmpAcquireKcbLockShared(HighKcb);
CmpAcquireKcbLockShared(LowKcb);
#if DBG
/* Get the high and low hives for validation */
HighHiveToValidate = (PCMHIVE)HighKcb->KeyHive;
LowHiveToValidate = (PCMHIVE)LowKcb->KeyHive;
#endif
if (LowKcb->Delete || HighKcb->Delete)
{
/* The source key has been deleted, do nothing */
Status = STATUS_KEY_DELETED;
goto done;
}
#if DBG
/* Make sure that both the high and low precedence hives are OK */
CheckStatus = CmCheckRegistry(HighHiveToValidate, CM_CHECK_REGISTRY_DONT_PURGE_VOLATILES | CM_CHECK_REGISTRY_VALIDATE_HIVE);
ASSERT(CM_CHECK_REGISTRY_SUCCESS(CheckStatus));
CheckStatus = CmCheckRegistry(LowHiveToValidate, CM_CHECK_REGISTRY_DONT_PURGE_VOLATILES | CM_CHECK_REGISTRY_VALIDATE_HIVE);
ASSERT(CM_CHECK_REGISTRY_SUCCESS(CheckStatus));
#endif
/* Create a new hive that will hold the key */
Status = CmpInitializeHive(&KeyHive,
HINIT_CREATE,
HIVE_VOLATILE,
HFILE_TYPE_PRIMARY,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
CM_CHECK_REGISTRY_DONT_PURGE_VOLATILES);
if (!NT_SUCCESS(Status))
goto done;
/* Copy the low precedence key recursively into the new hive */
Status = CmpDeepCopyKey(LowKcb->KeyHive,
LowKcb->KeyCell,
&KeyHive->Hive,
Stable,
&KeyHive->Hive.BaseBlock->RootCell);
if (!NT_SUCCESS(Status))
goto done;
/* Copy the high precedence key recursively into the new hive */
Status = CmpDeepCopyKey(HighKcb->KeyHive,
HighKcb->KeyCell,
&KeyHive->Hive,
Stable,
&KeyHive->Hive.BaseBlock->RootCell);
if (!NT_SUCCESS(Status))
goto done;
/* Set the primary handle of the hive */
KeyHive->FileHandles[HFILE_TYPE_PRIMARY] = FileHandle;
/* Dump the hive into the file */
HvWriteHive(&KeyHive->Hive);
done:
/* Free the hive */
if (KeyHive)
CmpDestroyHive(KeyHive);
#if DBG
if (NT_SUCCESS(Status))
{
/* Check those hives again before we say goodbye */
CheckStatus = CmCheckRegistry(HighHiveToValidate, CM_CHECK_REGISTRY_DONT_PURGE_VOLATILES | CM_CHECK_REGISTRY_VALIDATE_HIVE);
ASSERT(CM_CHECK_REGISTRY_SUCCESS(CheckStatus));
CheckStatus = CmCheckRegistry(LowHiveToValidate, CM_CHECK_REGISTRY_DONT_PURGE_VOLATILES | CM_CHECK_REGISTRY_VALIDATE_HIVE);
ASSERT(CM_CHECK_REGISTRY_SUCCESS(CheckStatus));
}
#endif
/* Release the locks */
CmpReleaseKcbLock(LowKcb);
CmpReleaseKcbLock(HighKcb);
CmpUnlockRegistry();
return Status;
}
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