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reactos/boot/environ/lib/misc/bootreg.c

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/*
* COPYRIGHT: See COPYING.ARM in the top level directory
* PROJECT: ReactOS UEFI Boot Library
* FILE: boot/environ/lib/misc/bootreg.c
* PURPOSE: Boot Library Boot Registry Wrapper for CMLIB
* PROGRAMMER: Alex Ionescu (alex.ionescu@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include "bl.h"
#include <bcd.h>
/* DEFINITIONS ***************************************************************/
#define BI_FLUSH_HIVE 0x01
#define BI_HIVE_WRITEABLE 0x02
/* DATA STRUCTURES ***********************************************************/
typedef struct _BI_KEY_HIVE
{
PHBASE_BLOCK BaseBlock;
ULONG HiveSize;
PBL_FILE_PATH_DESCRIPTOR FilePath;
CMHIVE Hive;
LONG ReferenceCount;
ULONG Flags;
PCM_KEY_NODE RootNode;
} BI_KEY_HIVE, *PBI_KEY_HIVE;
typedef struct _BI_KEY_OBJECT
{
PBI_KEY_HIVE KeyHive;
PCM_KEY_NODE KeyNode;
HCELL_INDEX KeyCell;
PWCHAR KeyName;
} BI_KEY_OBJECT, *PBI_KEY_OBJECT;
/* GLOBALS *******************************************************************/
BOOLEAN BiHiveHashLibraryInitialized;
ULONGLONG HvSymcryptSeed;
/* FUNCTIONS *****************************************************************/
BOOLEAN
HvIsInPlaceBaseBlockValid (
_In_ PHBASE_BLOCK BaseBlock
)
{
ULONG HiveLength, HeaderSum;
BOOLEAN Valid;
/* Assume failure */
Valid = FALSE;
/* Check for incorrect signature, type, version, or format */
if ((BaseBlock->Signature == 'fger') &&
(BaseBlock->Type == 0) &&
(BaseBlock->Major <= 1) &&
(BaseBlock->Minor <= 5) &&
(BaseBlock->Minor >= 3) &&
(BaseBlock->Format == 1))
{
/* Check for invalid hive size */
HiveLength = BaseBlock->Length;
if (HiveLength)
{
/* Check for misaligned or too large hive size */
if (!(HiveLength & 0xFFF) && HiveLength <= 0x7FFFE000)
{
/* Check for invalid header checksum */
HeaderSum = HvpHiveHeaderChecksum(BaseBlock);
if (HeaderSum == BaseBlock->CheckSum)
{
/* All good */
Valid = TRUE;
}
}
}
}
/* Return validity */
return Valid;
}
PVOID
NTAPI
CmpAllocate (
_In_ SIZE_T Size,
_In_ BOOLEAN Paged,
_In_ ULONG Tag
)
{
UNREFERENCED_PARAMETER(Paged);
UNREFERENCED_PARAMETER(Tag);
/* Call the heap allocator */
return BlMmAllocateHeap(Size);
}
VOID
NTAPI
CmpFree (
_In_ PVOID Ptr,
_In_ ULONG Quota
)
{
UNREFERENCED_PARAMETER(Quota);
/* Call the heap allocator */
BlMmFreeHeap(Ptr);
}
VOID
BiDereferenceHive (
_In_ HANDLE KeyHandle
)
{
PBI_KEY_OBJECT KeyObject;
/* Get the key object */
KeyObject = (PBI_KEY_OBJECT)KeyHandle;
/* Drop a reference on the parent hive */
--KeyObject->KeyHive->ReferenceCount;
}
VOID
BiFlushHive (
_In_ HANDLE KeyHandle
)
{
/* Not yet implemented */
EfiPrintf(L"NO reg flush\r\n");
return;
}
VOID
BiCloseKey (
_In_ HANDLE KeyHandle
)
{
PBI_KEY_HIVE KeyHive;
PBI_KEY_OBJECT KeyObject;
/* Get the key object and hive */
KeyObject = (PBI_KEY_OBJECT)KeyHandle;
KeyHive = KeyObject->KeyHive;
/* Check if we have a hive, or name, or key node */
if ((KeyHive) || (KeyObject->KeyNode) || (KeyObject->KeyName))
{
/* Drop a reference, see if it's the last one */
BiDereferenceHive(KeyHandle);
if (!KeyHive->ReferenceCount)
{
/* Check if we should flush it */
if (KeyHive->Flags & BI_FLUSH_HIVE)
{
BiFlushHive(KeyHandle);
}
/* Unmap the hive */
MmPapFreePages(KeyHive->BaseBlock, BL_MM_INCLUDE_MAPPED_ALLOCATED);
/* Free the hive and hive path */
BlMmFreeHeap(KeyHive->FilePath);
BlMmFreeHeap(KeyHive);
}
/* Check if a key name is present */
if (KeyObject->KeyName)
{
/* Free it */
BlMmFreeHeap(KeyObject->KeyName);
}
}
/* Free the object */
BlMmFreeHeap(KeyObject);
}
NTSTATUS
BiOpenKey(
_In_ HANDLE ParentHandle,
_In_ PWCHAR KeyName,
_Out_ PHANDLE Handle
)
{
PBI_KEY_OBJECT ParentKey, NewKey;
PBI_KEY_HIVE ParentHive;
NTSTATUS Status;
SIZE_T NameLength, SubNameLength, NameBytes;
PWCHAR NameStart, NameBuffer;
UNICODE_STRING KeyString;
HCELL_INDEX KeyCell;
PHHIVE Hive;
PCM_KEY_NODE ParentNode;
/* Convert from a handle to our key object */
ParentKey = (PBI_KEY_OBJECT)ParentHandle;
/* Extract the hive and node information */
ParentHive = ParentKey->KeyHive;
ParentNode = ParentKey->KeyNode;
Hive = &ParentKey->KeyHive->Hive.Hive;
/* Initialize variables */
KeyCell = HCELL_NIL;
Status = STATUS_SUCCESS;
NameBuffer = NULL;
/* Loop as long as there's still portions of the key name in play */
NameLength = wcslen(KeyName);
while (NameLength)
{
/* Find the first path separator */
NameStart = wcschr(KeyName, OBJ_NAME_PATH_SEPARATOR);
if (NameStart)
{
/* Look only at the key before the separator */
SubNameLength = NameStart - KeyName;
++NameStart;
}
else
{
/* No path separator, this is the final leaf key */
SubNameLength = NameLength;
}
/* Free the name buffer from the previous pass if needed */
if (NameBuffer)
{
BlMmFreeHeap(NameBuffer);
}
/* Allocate a buffer to hold the name of this specific subkey only */
NameBytes = SubNameLength * sizeof(WCHAR);
NameBuffer = BlMmAllocateHeap(NameBytes + sizeof(UNICODE_NULL));
if (!NameBuffer)
{
Status = STATUS_NO_MEMORY;
goto Quickie;
}
/* Copy and null-terminate the name of the subkey */
RtlCopyMemory(NameBuffer, KeyName, NameBytes);
NameBuffer[SubNameLength] = UNICODE_NULL;
/* Convert it into a UNICODE_STRING and try to find it */
RtlInitUnicodeString(&KeyString, NameBuffer);
KeyCell = CmpFindSubKeyByName(Hive, ParentNode, &KeyString);
if (KeyCell == HCELL_NIL)
{
Status = STATUS_OBJECT_NAME_NOT_FOUND;
goto Quickie;
}
/* We found it -- get the key node out of it */
ParentNode = (PCM_KEY_NODE)HvGetCell(Hive, KeyCell);
if (!ParentNode)
{
Status = STATUS_REGISTRY_CORRUPT;
goto Quickie;
}
/* Update the key name to the next remaining path element */
KeyName = NameStart;
if (NameStart)
{
/* Update the length to the remainder of the path */
NameLength += -1 - SubNameLength;
}
else
{
/* There's nothing left, this was the leaf key */
NameLength = 0;
}
}
/* Allocate a key object */
NewKey = BlMmAllocateHeap(sizeof(*NewKey));
if (!NewKey)
{
/* Bail out if we had no memory for it */
Status = STATUS_NO_MEMORY;
goto Quickie;
}
/* Fill out the key object data */
NewKey->KeyNode = ParentNode;
NewKey->KeyHive = ParentHive;
NewKey->KeyName = NameBuffer;
NewKey->KeyCell = KeyCell;
/* Add a reference to the hive */
++ParentHive->ReferenceCount;
/* Return the object back to the caller */
*Handle = NewKey;
Quickie:
/* If we had a name buffer, free it */
if (NameBuffer)
{
BlMmFreeHeap(NameBuffer);
}
/* Return status of the open operation */
return Status;
}
NTSTATUS
BiInitializeAndValidateHive (
_In_ PBI_KEY_HIVE Hive
)
{
ULONG HiveSize;
CM_CHECK_REGISTRY_STATUS CmStatusCode;
NTSTATUS Status;
/* Make sure the hive is at least the size of a base block */
if (Hive->HiveSize < sizeof(HBASE_BLOCK))
{
return STATUS_REGISTRY_CORRUPT;
}
/* Make sure that the base block accurately describes the size of the hive */
HiveSize = Hive->BaseBlock->Length + sizeof(HBASE_BLOCK);
if ((HiveSize < sizeof(HBASE_BLOCK)) || (HiveSize > Hive->HiveSize))
{
return STATUS_REGISTRY_CORRUPT;
}
/* Initialize a flat memory hive */
RtlZeroMemory(&Hive->Hive, sizeof(Hive->Hive));
Status = HvInitialize(&Hive->Hive.Hive,
HINIT_FLAT,
0,
0,
Hive->BaseBlock,
CmpAllocate,
CmpFree,
NULL,
NULL,
NULL,
NULL,
0,
NULL);
if (NT_SUCCESS(Status))
{
/* Cleanup volatile/old data */
CmStatusCode = CmCheckRegistry(Hive->Hive, CM_CHECK_REGISTRY_BOOTLOADER_PURGE_VOLATILES | CM_CHECK_REGISTRY_VALIDATE_HIVE);
if (!CM_CHECK_REGISTRY_SUCCESS(CmStatusCode))
{
return STATUS_REGISTRY_CORRUPT;
}
Status = STATUS_SUCCESS;
}
/* Return the final status */
return Status;
}
NTSTATUS
BiLoadHive (
_In_ PBL_FILE_PATH_DESCRIPTOR FilePath,
_Out_ PHANDLE HiveHandle
)
{
ULONG DeviceId;
PHBASE_BLOCK BaseBlock, NewBaseBlock;
PBI_KEY_OBJECT KeyObject;
PBI_KEY_HIVE BcdHive;
PBL_DEVICE_DESCRIPTOR BcdDevice;
ULONG PathLength, DeviceLength, HiveSize, HiveLength, NewHiveSize;
PWCHAR HiveName, LogName;
BOOLEAN HaveWriteAccess;
NTSTATUS Status;
PVOID LogData;
PHHIVE Hive;
UNICODE_STRING KeyString;
PCM_KEY_NODE RootNode;
HCELL_INDEX CellIndex;
/* Initialize variables */
DeviceId = -1;
BaseBlock = NULL;
BcdHive = NULL;
KeyObject = NULL;
LogData = NULL;
LogName = NULL;
/* Initialize the crypto seed */
if (!BiHiveHashLibraryInitialized)
{
HvSymcryptSeed = 0x82EF4D887A4E55C5;
BiHiveHashLibraryInitialized = TRUE;
}
/* Extract and validate the input path */
BcdDevice = (PBL_DEVICE_DESCRIPTOR)&FilePath->Path;
PathLength = FilePath->Length;
DeviceLength = BcdDevice->Size;
HiveName = (PWCHAR)((ULONG_PTR)BcdDevice + BcdDevice->Size);
if (PathLength <= DeviceLength)
{
/* Doesn't make sense, bail out */
Status = STATUS_INVALID_PARAMETER;
goto Quickie;
}
/* Attempt to open the underlying device for RW access */
HaveWriteAccess = TRUE;
Status = BlpDeviceOpen(BcdDevice,
BL_DEVICE_READ_ACCESS | BL_DEVICE_WRITE_ACCESS,
0,
&DeviceId);
if (!NT_SUCCESS(Status))
{
/* Try for RO access instead */
HaveWriteAccess = FALSE;
Status = BlpDeviceOpen(BcdDevice, BL_DEVICE_READ_ACCESS, 0, &DeviceId);
if (!NT_SUCCESS(Status))
{
/* No access at all -- bail out */
goto Quickie;
}
}
/* Now try to load the hive on disk */
Status = BlImgLoadImageWithProgress2(DeviceId,
BlLoaderRegistry,
HiveName,
(PVOID*)&BaseBlock,
&HiveSize,
0,
FALSE,
NULL,
NULL);
if (!NT_SUCCESS(Status))
{
EfiPrintf(L"Hive read failure: % lx\r\n", Status);
goto Quickie;
}
/* Allocate a hive structure */
BcdHive = BlMmAllocateHeap(sizeof(*BcdHive));
if (!BcdHive)
{
Status = STATUS_NO_MEMORY;
goto Quickie;
}
/* Initialize it */
RtlZeroMemory(BcdHive, sizeof(*BcdHive));
BcdHive->BaseBlock = BaseBlock;
BcdHive->HiveSize = HiveSize;
if (HaveWriteAccess)
{
BcdHive->Flags |= BI_HIVE_WRITEABLE;
}
/* Make sure the hive was at least one bin long */
if (HiveSize < sizeof(*BaseBlock))
{
Status = STATUS_REGISTRY_CORRUPT;
goto Quickie;
}
/* Make sure the hive contents are at least one bin long */
HiveLength = BaseBlock->Length;
if (BaseBlock->Length < sizeof(*BaseBlock))
{
Status = STATUS_REGISTRY_CORRUPT;
goto Quickie;
}
/* Validate the initial bin (the base block) */
if (!HvIsInPlaceBaseBlockValid(BaseBlock))
{
EfiPrintf(L"Recovery not implemented\r\n");
Status = STATUS_REGISTRY_CORRUPT;
goto Quickie;
}
/* Check if there's log recovery that needs to happen */
if (BaseBlock->Sequence1 != BaseBlock->Sequence2)
{
EfiPrintf(L"Log fix not implemented: %lx %lx\r\n");
Status = STATUS_REGISTRY_CORRUPT;
goto Quickie;
}
/*
* Check if the whole hive doesn't fit in the buffer.
* Note: HiveLength does not include the size of the baseblock itself
*/
if (HiveSize < (HiveLength + sizeof(*BaseBlock)))
{
EfiPrintf(L"Need bigger hive buffer path\r\n");
/* Allocate a slightly bigger buffer */
NewHiveSize = HiveLength + sizeof(*BaseBlock);
Status = MmPapAllocatePagesInRange((PVOID*)&NewBaseBlock,
BlLoaderRegistry,
NewHiveSize >> PAGE_SHIFT,
0,
0,
NULL,
0);
if (!NT_SUCCESS(Status))
{
goto Quickie;
}
/* Copy the current data in there */
RtlCopyMemory(NewBaseBlock, BaseBlock, HiveSize);
/* Free the old data */
MmPapFreePages(BaseBlock, BL_MM_INCLUDE_MAPPED_ALLOCATED);
/* Update our pointers */
BaseBlock = NewBaseBlock;
HiveSize = NewHiveSize;
BcdHive->BaseBlock = BaseBlock;
BcdHive->HiveSize = HiveSize;
}
/* Check if any log stuff needs to happen */
if (LogData)
{
EfiPrintf(L"Log fix not implemented: %lx %lx\r\n");
Status = STATUS_REGISTRY_CORRUPT;
goto Quickie;
}
/* Call Hv to setup the hive library */
Status = BiInitializeAndValidateHive(BcdHive);
if (!NT_SUCCESS(Status))
{
goto Quickie;
}
/* Now get the root node */
Hive = &BcdHive->Hive.Hive;
RootNode = (PCM_KEY_NODE)HvGetCell(Hive, Hive->BaseBlock->RootCell);
if (!RootNode)
{
Status = STATUS_OBJECT_NAME_NOT_FOUND;
goto Quickie;
}
/* Find the Objects subkey under it to see if it's a real BCD hive */
RtlInitUnicodeString(&KeyString, L"Objects");
CellIndex = CmpFindSubKeyByName(Hive, RootNode, &KeyString);
if (CellIndex == HCELL_NIL)
{
EfiPrintf(L"No OBJECTS subkey found!\r\n");
Status = STATUS_OBJECT_NAME_NOT_FOUND;
goto Quickie;
}
/* This is a valid BCD hive, store its root node here */
BcdHive->RootNode = RootNode;
/* Allocate a copy of the file path */
BcdHive->FilePath = BlMmAllocateHeap(FilePath->Length);
if (!BcdHive->FilePath)
{
Status = STATUS_NO_MEMORY;
goto Quickie;
}
/* Make a copy of it */
RtlCopyMemory(BcdHive->FilePath, FilePath, FilePath->Length);
/* Create a key object to describe the rot */
KeyObject = BlMmAllocateHeap(sizeof(*KeyObject));
if (!KeyObject)
{
Status = STATUS_NO_MEMORY;
goto Quickie;
}
/* Fill out the details */
KeyObject->KeyNode = RootNode;
KeyObject->KeyHive = BcdHive;
KeyObject->KeyName = NULL;
KeyObject->KeyCell = Hive->BaseBlock->RootCell;
/* One reference for the key object, plus one lifetime reference */
BcdHive->ReferenceCount = 2;
/* This is the hive handle */
*HiveHandle = KeyObject;
/* We're all good */
Status = STATUS_SUCCESS;
Quickie:
/* If we had a log name, free it */
if (LogName)
{
BlMmFreeHeap(LogName);
}
/* If we had logging data, free it */
if (LogData)
{
MmPapFreePages(LogData, BL_MM_INCLUDE_MAPPED_ALLOCATED);
}
/* Check if this is the failure path */
if (!NT_SUCCESS(Status))
{
/* If we mapped the hive, free it */
if (BaseBlock)
{
MmPapFreePages(BaseBlock, BL_MM_INCLUDE_MAPPED_ALLOCATED);
}
/* If we opened the device, close it */
if (DeviceId != -1)
{
BlDeviceClose(DeviceId);
}
/* Did we create a hive object? */
if (BcdHive)
{
/* Free the file path if we made a copy of it */
if (BcdHive->FilePath)
{
BlMmFreeHeap(BcdHive->FilePath);
}
/* Free the hive itself */
BlMmFreeHeap(BcdHive);
}
/* Finally, free the root key object if we created one */
if (KeyObject)
{
BlMmFreeHeap(KeyObject);
}
}
/* Return the final status */
return Status;
}
NTSTATUS
BiGetRegistryValue (
_In_ HANDLE KeyHandle,
_In_ PWCHAR ValueName,
_In_ ULONG Type,
_Out_ PVOID* Buffer,
_Out_ PULONG ValueLength
)
{
PCM_KEY_NODE KeyNode;
PHHIVE KeyHive;
UNICODE_STRING ValueString;
PBI_KEY_OBJECT KeyObject;
PCM_KEY_VALUE KeyValue;
PVOID ValueCopy;
ULONG Size;
HCELL_INDEX CellIndex;
PCELL_DATA ValueData;
/* Get the key object, node,and hive */
KeyObject = (PBI_KEY_OBJECT)KeyHandle;
KeyNode = KeyObject->KeyNode;
KeyHive = &KeyObject->KeyHive->Hive.Hive;
/* Find the value cell index in the list of values */
RtlInitUnicodeString(&ValueString, ValueName);
CmpFindNameInList(KeyHive,
&KeyNode->ValueList,
&ValueString,
NULL,
&CellIndex);
if (CellIndex == HCELL_NIL)
{
return STATUS_OBJECT_NAME_NOT_FOUND;
}
/* Get the cell data for it */
KeyValue = (PCM_KEY_VALUE)HvGetCell(KeyHive, CellIndex);
if (!KeyValue)
{
return STATUS_REGISTRY_CORRUPT;
}
/* Make sure the type matches */
if (KeyValue->Type != Type)
{
return STATUS_OBJECT_TYPE_MISMATCH;
}
/* Now get the data cell */
ValueData = CmpValueToData(KeyHive, KeyValue, &Size);
/* Make a copy of it */
ValueCopy = BlMmAllocateHeap(Size);
if (!ValueCopy)
{
return STATUS_NO_MEMORY;
}
/* Copy it in the buffer, and return it and its size */
RtlCopyMemory(ValueCopy, ValueData, Size);
*Buffer = ValueCopy;
*ValueLength = Size;
return STATUS_SUCCESS;
}
NTSTATUS
BiEnumerateSubKeys (
_In_ HANDLE KeyHandle,
_Out_ PWCHAR** SubKeyList,
_Out_ PULONG SubKeyCount
)
{
PCM_KEY_NODE KeyNode, Node;
PBI_KEY_OBJECT KeyObject;
ULONG KeyCount;
ULONG NameLength, NewTotalNameLength, FinalLength, TotalNameLength;
PHHIVE Hive;
PWCHAR KeyName, NameEnd;
HCELL_INDEX CellIndex;
PWCHAR* SubKeys;
NTSTATUS Status;
ULONG i;
/* Get the key object, node, and hive */
KeyObject = (PBI_KEY_OBJECT)KeyHandle;
KeyNode = KeyObject->KeyNode;
Hive = &KeyObject->KeyHive->Hive.Hive;
/* Assume it's empty */
*SubKeyList = 0;
*SubKeyCount = 0;
/* Initialize locals */
KeyCount = 0;
SubKeys = 0;
TotalNameLength = 0;
/* Find the first subkey cell index */
CellIndex = CmpFindSubKeyByNumber(Hive, KeyNode, KeyCount);
while (CellIndex != HCELL_NIL)
{
/* Move to the next one */
KeyCount++;
/* Get the cell data for it */
Node = (PCM_KEY_NODE)HvGetCell(Hive, CellIndex);
if (!Node)
{
return STATUS_REGISTRY_CORRUPT;
}
/* 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;
}
/* Add up the new length, protecting against overflow */
NewTotalNameLength = TotalNameLength + NameLength + sizeof(UNICODE_NULL);
if (NewTotalNameLength < TotalNameLength)
{
Status = STATUS_NAME_TOO_LONG;
goto Quickie;
}
/* We're good, use the new length */
TotalNameLength = NewTotalNameLength;
/* Find the next subkey cell index */
CellIndex = CmpFindSubKeyByNumber(Hive, KeyNode, KeyCount);
}
/* Were there no keys? We're done, if so */
if (!KeyCount)
{
return STATUS_SUCCESS;
}
/* Safely compute the size of the array needed */
Status = RtlULongLongToULong(sizeof(PWCHAR) * KeyCount, &FinalLength);
if (!NT_SUCCESS(Status))
{
goto Quickie;
}
/* Safely add that to the name length */
Status = RtlULongAdd(TotalNameLength, FinalLength, &FinalLength);
if (!NT_SUCCESS(Status))
{
goto Quickie;
}
/* Allocate an array big enough for the names and pointers */
SubKeys = BlMmAllocateHeap(FinalLength);
if (!SubKeys)
{
Status = STATUS_NO_MEMORY;
goto Quickie;
}
/* Go over each key again */
NameEnd = (PWCHAR)&SubKeys[KeyCount];
for (i = 0; i < KeyCount; i++)
{
/* Get the cell index for this subkey */
CellIndex = CmpFindSubKeyByNumber(Hive, KeyNode, i);
if (CellIndex == HCELL_NIL)
{
break;
}
/* Get the cell data for it */
Node = (PCM_KEY_NODE)HvGetCell(Hive, CellIndex);
if (!Node)
{
Status = STATUS_REGISTRY_CORRUPT;
goto Quickie;
}
/* Check if the value is compressed */
KeyName = Node->Name;
if (Node->Flags & KEY_COMP_NAME)
{
/* Get the compressed name size */
NameLength = CmpCompressedNameSize(KeyName, Node->NameLength);
CmpCopyCompressedName(NameEnd, NameLength, KeyName, Node->NameLength);
}
else
{
/* Get the real size */
NameLength = Node->NameLength;
RtlCopyMemory(NameEnd, KeyName, NameLength);
}
/* Move the name buffer to the next spot, and NULL-terminate */
SubKeys[i] = NameEnd;
NameEnd += (NameLength / sizeof(WCHAR));
*NameEnd = UNICODE_NULL;
/* Keep going */
NameEnd++;
}
/* Check if the subkeys were empty */
if (i == 0)
{
/* They disappeared in the middle of enumeration */
Status = STATUS_OBJECT_NAME_NOT_FOUND;
goto Quickie;
}
/* Return the count and the array of names */
*SubKeyList = SubKeys;
*SubKeyCount = i;
SubKeys = NULL;
Status = STATUS_SUCCESS;
Quickie:
/* On the failure path, free the subkeys if any exist */
if (SubKeys)
{
BlMmFreeHeap(SubKeys);
}
/* All done, return the result */
return Status;
}
NTSTATUS
BiDeleteKey (
_In_ HANDLE KeyHandle
)
{
NTSTATUS Status;
PBI_KEY_OBJECT KeyObject;
PHHIVE Hive;
ULONG SubKeyCount, i;
PWCHAR* SubKeyList;
HANDLE SubKeyHandle;
/* Get the key object and hive */
KeyObject = (PBI_KEY_OBJECT)KeyHandle;
Hive = &KeyObject->KeyHive->Hive.Hive;
/* Make sure the hive is writeable */
if (!(KeyObject->KeyHive->Flags & BI_HIVE_WRITEABLE))
{
return STATUS_MEDIA_WRITE_PROTECTED;
}
/* Enumerate all of the subkeys */
Status = BiEnumerateSubKeys(KeyHandle, &SubKeyList, &SubKeyCount);
if ((NT_SUCCESS(Status)) && (SubKeyCount > 0))
{
/* Loop through each one */
for (i = 0; i < SubKeyCount; i++)
{
/* Open a handle to it */
Status = BiOpenKey(KeyHandle, SubKeyList[i], &SubKeyHandle);
if (NT_SUCCESS(Status))
{
/* Recursively call us to delete it */
Status = BiDeleteKey(SubKeyHandle);
if (Status != STATUS_SUCCESS)
{
/* Close the key on failure */
BiCloseKey(SubKeyHandle);
}
}
}
}
/* Check if we had a list of subkeys */
if (SubKeyList)
{
/* Free it */
BlMmFreeHeap(SubKeyList);
}
/* Delete this key cell */
Status = CmpFreeKeyByCell(Hive, KeyObject->KeyCell, TRUE);
if (NT_SUCCESS(Status))
{
/* Mark the hive as requiring a flush */
KeyObject->KeyHive->Flags |= BI_FLUSH_HIVE;
BiCloseKey(KeyHandle);
}
/* All done */
return Status;
}
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