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![Hermès Bélusca-Maïto](/assets/img/avatar_default.png)
- When we are in LiveCD mode (more generally, when hives are shared), load the system hives as volatile. - Ignore hive write operations when everything operates in read-only mode and just return success instead. - Just return success on hive file I/O if no file is associated with a given hive. This happens when e.g. a CM hive has a primary but no log.
183 lines
5.4 KiB
C
183 lines
5.4 KiB
C
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: ntoskrnl/config/cmwraprs.c
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* PURPOSE: Configuration Manager - Wrappers for Hive Operations
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* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include "ntoskrnl.h"
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#define NDEBUG
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#include "debug.h"
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/* FUNCTIONS *****************************************************************/
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NTSTATUS
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NTAPI
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CmpCreateEvent(IN EVENT_TYPE EventType,
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OUT PHANDLE EventHandle,
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OUT PKEVENT *Event)
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{
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NTSTATUS Status;
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OBJECT_ATTRIBUTES ObjectAttributes;
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/* Create the event */
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InitializeObjectAttributes(&ObjectAttributes,
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NULL,
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OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
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NULL,
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NULL);
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Status = ZwCreateEvent(EventHandle,
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EVENT_ALL_ACCESS,
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&ObjectAttributes,
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EventType,
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FALSE);
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if (!NT_SUCCESS(Status)) return Status;
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/* Get a pointer to the object itself */
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Status = ObReferenceObjectByHandle(*EventHandle,
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EVENT_ALL_ACCESS,
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NULL,
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KernelMode,
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(PVOID*)Event,
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NULL);
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if (!NT_SUCCESS(Status)) ZwClose(*EventHandle);
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/* Return status */
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return Status;
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}
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PVOID
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NTAPI
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CmpAllocate(IN SIZE_T Size,
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IN BOOLEAN Paged,
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IN ULONG Tag)
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{
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return ExAllocatePoolWithTag(Paged ? PagedPool : NonPagedPool,
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Size,
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Tag);
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}
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VOID
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NTAPI
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CmpFree(IN PVOID Ptr,
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IN ULONG Quota)
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{
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ExFreePool(Ptr);
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}
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BOOLEAN
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NTAPI
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CmpFileRead(IN PHHIVE RegistryHive,
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IN ULONG FileType,
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IN PULONG FileOffset,
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OUT PVOID Buffer,
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IN SIZE_T BufferLength)
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{
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PCMHIVE CmHive = (PCMHIVE)RegistryHive;
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HANDLE HiveHandle = CmHive->FileHandles[FileType];
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LARGE_INTEGER _FileOffset;
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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/* Just return success if no file is associated with this hive */
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if (HiveHandle == NULL)
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return TRUE;
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_FileOffset.QuadPart = *FileOffset;
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Status = ZwReadFile(HiveHandle, NULL, NULL, NULL, &IoStatusBlock,
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Buffer, (ULONG)BufferLength, &_FileOffset, NULL);
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return NT_SUCCESS(Status) ? TRUE : FALSE;
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}
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BOOLEAN
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NTAPI
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CmpFileWrite(IN PHHIVE RegistryHive,
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IN ULONG FileType,
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IN PULONG FileOffset,
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IN PVOID Buffer,
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IN SIZE_T BufferLength)
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{
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PCMHIVE CmHive = (PCMHIVE)RegistryHive;
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HANDLE HiveHandle = CmHive->FileHandles[FileType];
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LARGE_INTEGER _FileOffset;
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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/* Just return success if no file is associated with this hive */
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if (HiveHandle == NULL)
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return TRUE;
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/* Don't do anything if we're not supposed to */
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if (CmpNoWrite)
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return TRUE;
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_FileOffset.QuadPart = *FileOffset;
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Status = ZwWriteFile(HiveHandle, NULL, NULL, NULL, &IoStatusBlock,
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Buffer, (ULONG)BufferLength, &_FileOffset, NULL);
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return NT_SUCCESS(Status) ? TRUE : FALSE;
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}
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BOOLEAN
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NTAPI
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CmpFileSetSize(IN PHHIVE RegistryHive,
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IN ULONG FileType,
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IN ULONG FileSize,
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IN ULONG OldFileSize)
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{
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PCMHIVE CmHive = (PCMHIVE)RegistryHive;
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HANDLE HiveHandle = CmHive->FileHandles[FileType];
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FILE_END_OF_FILE_INFORMATION EndOfFileInfo;
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FILE_ALLOCATION_INFORMATION FileAllocationInfo;
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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/* Just return success if no file is associated with this hive */
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if (HiveHandle == NULL)
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return TRUE;
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EndOfFileInfo.EndOfFile.QuadPart = FileSize;
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Status = ZwSetInformationFile(HiveHandle,
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&IoStatusBlock,
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&EndOfFileInfo,
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sizeof(FILE_END_OF_FILE_INFORMATION),
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FileEndOfFileInformation);
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if (!NT_SUCCESS(Status)) return FALSE;
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FileAllocationInfo.AllocationSize.QuadPart = FileSize;
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Status = ZwSetInformationFile(HiveHandle,
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&IoStatusBlock,
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&FileAllocationInfo,
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sizeof(FILE_ALLOCATION_INFORMATION),
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FileAllocationInformation);
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if (!NT_SUCCESS(Status)) return FALSE;
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return TRUE;
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}
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BOOLEAN
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NTAPI
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CmpFileFlush(IN PHHIVE RegistryHive,
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IN ULONG FileType,
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IN OUT PLARGE_INTEGER FileOffset,
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IN ULONG Length)
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{
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PCMHIVE CmHive = (PCMHIVE)RegistryHive;
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HANDLE HiveHandle = CmHive->FileHandles[FileType];
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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/* Just return success if no file is associated with this hive */
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if (HiveHandle == NULL)
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return TRUE;
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/* Don't do anything if we're not supposed to */
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if (CmpNoWrite)
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return TRUE;
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Status = ZwFlushBuffersFile(HiveHandle, &IoStatusBlock);
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return NT_SUCCESS(Status) ? TRUE : FALSE;
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}
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