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reactos/drivers/storage/mountmgr/database.c
Victor Perevertkin b8525ce7a5
[MOUNTMGR] Fix ReparseFile concatenation in OnlineMountedVolumes 
- ReparseFile was concatenated with itself, instead of ReparseIndex
- Meanwhile, use RtlAppendUnicodeStringToString for concatenating
  strings instead of raw memory operations
2020-11-08 23:32:25 +03:00

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/*
* ReactOS kernel
* Copyright (C) 2011-2012 ReactOS Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/filesystem/mountmgr/mountmgr.c
* PURPOSE: Mount Manager - remote/local database handler
* PROGRAMMER: Pierre Schweitzer (pierre.schweitzer@reactos.org)
*/
#include "mntmgr.h"
#define NDEBUG
#include <debug.h>
PWSTR DatabasePath = L"\\Registry\\Machine\\System\\MountedDevices";
PWSTR OfflinePath = L"\\Registry\\Machine\\System\\MountedDevices\\Offline";
UNICODE_STRING RemoteDatabase = RTL_CONSTANT_STRING(L"\\System Volume Information\\MountPointManagerRemoteDatabase");
/*
* @implemented
*/
LONG
GetRemoteDatabaseSize(IN HANDLE Database)
{
NTSTATUS Status;
IO_STATUS_BLOCK IoStatusBlock;
FILE_STANDARD_INFORMATION StandardInfo;
/* Just query the size */
Status = ZwQueryInformationFile(Database,
&IoStatusBlock,
&StandardInfo,
sizeof(FILE_STANDARD_INFORMATION),
FileStandardInformation);
if (NT_SUCCESS(Status))
{
return StandardInfo.EndOfFile.LowPart;
}
return 0;
}
/*
* @implemented
*/
NTSTATUS
AddRemoteDatabaseEntry(IN HANDLE Database,
IN PDATABASE_ENTRY Entry)
{
LARGE_INTEGER Size;
IO_STATUS_BLOCK IoStatusBlock;
/* Get size to append data */
Size.QuadPart = GetRemoteDatabaseSize(Database);
return ZwWriteFile(Database, NULL, NULL, NULL,
&IoStatusBlock, Entry,
Entry->EntrySize, &Size, NULL);
}
/*
* @implemented
*/
NTSTATUS
CloseRemoteDatabase(IN HANDLE Database)
{
return ZwClose(Database);
}
/*
* @implemented
*/
NTSTATUS
TruncateRemoteDatabase(IN HANDLE Database,
IN LONG NewSize)
{
NTSTATUS Status;
IO_STATUS_BLOCK IoStatusBlock;
FILE_END_OF_FILE_INFORMATION EndOfFile;
FILE_ALLOCATION_INFORMATION Allocation;
EndOfFile.EndOfFile.QuadPart = NewSize;
Allocation.AllocationSize.QuadPart = NewSize;
/* First set EOF */
Status = ZwSetInformationFile(Database,
&IoStatusBlock,
&EndOfFile,
sizeof(FILE_END_OF_FILE_INFORMATION),
FileEndOfFileInformation);
if (NT_SUCCESS(Status))
{
/* And then, properly set allocation information */
Status = ZwSetInformationFile(Database,
&IoStatusBlock,
&Allocation,
sizeof(FILE_ALLOCATION_INFORMATION),
FileAllocationInformation);
}
return Status;
}
/*
* @implemented
*/
PDATABASE_ENTRY
GetRemoteDatabaseEntry(IN HANDLE Database,
IN LONG StartingOffset)
{
NTSTATUS Status;
ULONG EntrySize;
PDATABASE_ENTRY Entry;
LARGE_INTEGER ByteOffset;
IO_STATUS_BLOCK IoStatusBlock;
/* Get the entry at the given position */
ByteOffset.QuadPart = StartingOffset;
Status = ZwReadFile(Database,
NULL,
NULL,
NULL,
&IoStatusBlock,
&EntrySize,
sizeof(EntrySize),
&ByteOffset,
NULL);
if (!NT_SUCCESS(Status))
{
return NULL;
}
/* If entry doesn't exist, truncate database */
if (!EntrySize)
{
TruncateRemoteDatabase(Database, StartingOffset);
return NULL;
}
/* Allocate the entry */
Entry = AllocatePool(EntrySize);
if (!Entry)
{
return NULL;
}
/* Effectively read the entry */
Status = ZwReadFile(Database,
NULL,
NULL,
NULL,
&IoStatusBlock,
Entry,
EntrySize,
&ByteOffset,
NULL);
/* If it fails or returns inconsistent data, drop it (= truncate) */
if (!NT_SUCCESS(Status) ||
(IoStatusBlock.Information != EntrySize) ||
(EntrySize < sizeof(DATABASE_ENTRY)) )
{
TruncateRemoteDatabase(Database, StartingOffset);
FreePool(Entry);
return NULL;
}
/* Validate entry */
if (MAX(Entry->SymbolicNameOffset + Entry->SymbolicNameLength,
Entry->UniqueIdOffset + Entry->UniqueIdLength) > (LONG)EntrySize)
{
TruncateRemoteDatabase(Database, StartingOffset);
FreePool(Entry);
return NULL;
}
return Entry;
}
/*
* @implemented
*/
NTSTATUS
WriteRemoteDatabaseEntry(IN HANDLE Database,
IN LONG Offset,
IN PDATABASE_ENTRY Entry)
{
NTSTATUS Status;
LARGE_INTEGER ByteOffset;
IO_STATUS_BLOCK IoStatusBlock;
ByteOffset.QuadPart = Offset;
Status = ZwWriteFile(Database,
NULL,
NULL,
NULL,
&IoStatusBlock,
Entry,
Entry->EntrySize,
&ByteOffset,
NULL);
if (NT_SUCCESS(Status))
{
if (IoStatusBlock.Information < Entry->EntrySize)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
}
}
return Status;
}
/*
* @implemented
*/
NTSTATUS
DeleteRemoteDatabaseEntry(IN HANDLE Database,
IN LONG StartingOffset)
{
ULONG EndSize;
PVOID TmpBuffer;
NTSTATUS Status;
ULONG DatabaseSize;
PDATABASE_ENTRY Entry;
IO_STATUS_BLOCK IoStatusBlock;
LARGE_INTEGER EndEntriesOffset;
/* First, get database size */
DatabaseSize = GetRemoteDatabaseSize(Database);
if (!DatabaseSize)
{
return STATUS_INVALID_PARAMETER;
}
/* Then, get the entry to remove */
Entry = GetRemoteDatabaseEntry(Database, StartingOffset);
if (!Entry)
{
return STATUS_INVALID_PARAMETER;
}
/* Validate parameters: ensure we won't get negative size */
if (Entry->EntrySize + StartingOffset > DatabaseSize)
{
/* If we get invalid parameters, truncate the whole database
* starting the wrong entry. We can't rely on the rest
*/
FreePool(Entry);
return TruncateRemoteDatabase(Database, StartingOffset);
}
/* Now, get the size of the remaining entries (those after the one to remove) */
EndSize = DatabaseSize - Entry->EntrySize - StartingOffset;
/* Allocate a buffer big enough to hold them */
TmpBuffer = AllocatePool(EndSize);
if (!TmpBuffer)
{
FreePool(Entry);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Get the offset of the entry right after the one to delete */
EndEntriesOffset.QuadPart = Entry->EntrySize + StartingOffset;
/* We don't need the entry any more */
FreePool(Entry);
/* Read the ending entries */
Status = ZwReadFile(Database, NULL, NULL, NULL, &IoStatusBlock,
TmpBuffer, EndSize, &EndEntriesOffset, NULL);
if (!NT_SUCCESS(Status))
{
FreePool(TmpBuffer);
return Status;
}
/* Ensure nothing went wrong - we don't want to corrupt the DB */
if (IoStatusBlock.Information != EndSize)
{
FreePool(TmpBuffer);
return STATUS_INVALID_PARAMETER;
}
/* Remove the entry */
Status = TruncateRemoteDatabase(Database, StartingOffset + EndSize);
if (!NT_SUCCESS(Status))
{
FreePool(TmpBuffer);
return Status;
}
/* Now, shift the ending entries to erase the entry */
EndEntriesOffset.QuadPart = StartingOffset;
Status = ZwWriteFile(Database, NULL, NULL, NULL, &IoStatusBlock,
TmpBuffer, EndSize, &EndEntriesOffset, NULL);
FreePool(TmpBuffer);
return Status;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
DeleteFromLocalDatabaseRoutine(IN PWSTR ValueName,
IN ULONG ValueType,
IN PVOID ValueData,
IN ULONG ValueLength,
IN PVOID Context,
IN PVOID EntryContext)
{
PMOUNTDEV_UNIQUE_ID UniqueId = Context;
UNREFERENCED_PARAMETER(ValueType);
UNREFERENCED_PARAMETER(EntryContext);
/* Ensure it matches, and delete */
if ((UniqueId->UniqueIdLength == ValueLength) &&
(RtlCompareMemory(UniqueId->UniqueId, ValueData, ValueLength) ==
ValueLength))
{
RtlDeleteRegistryValue(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
ValueName);
}
return STATUS_SUCCESS;
}
/*
* @implemented
*/
VOID
DeleteFromLocalDatabase(IN PUNICODE_STRING SymbolicLink,
IN PMOUNTDEV_UNIQUE_ID UniqueId)
{
RTL_QUERY_REGISTRY_TABLE QueryTable[2];
RtlZeroMemory(QueryTable, sizeof(QueryTable));
QueryTable[0].QueryRoutine = DeleteFromLocalDatabaseRoutine;
QueryTable[0].Name = SymbolicLink->Buffer;
RtlQueryRegistryValues(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
QueryTable,
UniqueId,
NULL);
}
/*
* @implemented
*/
NTSTATUS
WaitForRemoteDatabaseSemaphore(IN PDEVICE_EXTENSION DeviceExtension)
{
NTSTATUS Status;
LARGE_INTEGER Timeout;
/* Wait for 7 minutes */
Timeout.QuadPart = 0xFA0A1F00;
Status = KeWaitForSingleObject(&(DeviceExtension->RemoteDatabaseLock), Executive, KernelMode, FALSE, &Timeout);
if (Status != STATUS_TIMEOUT)
{
return Status;
}
return STATUS_IO_TIMEOUT;
}
/*
* @implemented
*/
VOID
ReleaseRemoteDatabaseSemaphore(IN PDEVICE_EXTENSION DeviceExtension)
{
KeReleaseSemaphore(&(DeviceExtension->RemoteDatabaseLock), IO_NO_INCREMENT, 1, FALSE);
}
/*
* @implemented
*/
NTSTATUS
NTAPI
QueryUniqueIdQueryRoutine(IN PWSTR ValueName,
IN ULONG ValueType,
IN PVOID ValueData,
IN ULONG ValueLength,
IN PVOID Context,
IN PVOID EntryContext)
{
PMOUNTDEV_UNIQUE_ID IntUniqueId;
PMOUNTDEV_UNIQUE_ID * UniqueId;
UNREFERENCED_PARAMETER(ValueName);
UNREFERENCED_PARAMETER(ValueType);
UNREFERENCED_PARAMETER(EntryContext);
/* Sanity check */
if (ValueLength >= 0x10000)
{
return STATUS_SUCCESS;
}
/* Allocate the Unique ID */
IntUniqueId = AllocatePool(sizeof(UniqueId) + ValueLength);
if (IntUniqueId)
{
/* Copy data & return */
IntUniqueId->UniqueIdLength = (USHORT)ValueLength;
RtlCopyMemory(&(IntUniqueId->UniqueId), ValueData, ValueLength);
UniqueId = Context;
*UniqueId = IntUniqueId;
}
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
QueryUniqueIdFromMaster(IN PDEVICE_EXTENSION DeviceExtension,
IN PUNICODE_STRING SymbolicName,
OUT PMOUNTDEV_UNIQUE_ID * UniqueId)
{
NTSTATUS Status;
PDEVICE_INFORMATION DeviceInformation;
RTL_QUERY_REGISTRY_TABLE QueryTable[2];
/* Query the unique ID */
RtlZeroMemory(QueryTable, sizeof(QueryTable));
QueryTable[0].QueryRoutine = QueryUniqueIdQueryRoutine;
QueryTable[0].Name = SymbolicName->Buffer;
*UniqueId = NULL;
RtlQueryRegistryValues(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
QueryTable,
UniqueId,
NULL);
/* Unique ID found, no need to go farther */
if (*UniqueId)
{
return STATUS_SUCCESS;
}
/* Otherwise, find associate device information */
Status = FindDeviceInfo(DeviceExtension, SymbolicName, FALSE, &DeviceInformation);
if (!NT_SUCCESS(Status))
{
return Status;
}
*UniqueId = AllocatePool(DeviceInformation->UniqueId->UniqueIdLength + sizeof(MOUNTDEV_UNIQUE_ID));
if (!*UniqueId)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Return this unique ID (better than nothing) */
(*UniqueId)->UniqueIdLength = DeviceInformation->UniqueId->UniqueIdLength;
RtlCopyMemory(&((*UniqueId)->UniqueId), &(DeviceInformation->UniqueId->UniqueId), (*UniqueId)->UniqueIdLength);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
WriteUniqueIdToMaster(IN PDEVICE_EXTENSION DeviceExtension,
IN PDATABASE_ENTRY DatabaseEntry)
{
NTSTATUS Status;
PWCHAR SymbolicName;
PLIST_ENTRY NextEntry;
UNICODE_STRING SymbolicString;
PDEVICE_INFORMATION DeviceInformation;
/* Create symbolic name from database entry */
SymbolicName = AllocatePool(DatabaseEntry->SymbolicNameLength + sizeof(WCHAR));
if (!SymbolicName)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(SymbolicName,
(PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->SymbolicNameOffset),
DatabaseEntry->SymbolicNameLength);
SymbolicName[DatabaseEntry->SymbolicNameLength / sizeof(WCHAR)] = UNICODE_NULL;
/* Associate the unique ID with the name from remote database */
Status = RtlWriteRegistryValue(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
SymbolicName,
REG_BINARY,
(PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->UniqueIdOffset),
DatabaseEntry->UniqueIdLength);
FreePool(SymbolicName);
/* Reget symbolic name */
SymbolicString.Length = DatabaseEntry->SymbolicNameLength;
SymbolicString.MaximumLength = DatabaseEntry->SymbolicNameLength;
SymbolicString.Buffer = (PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->SymbolicNameOffset);
/* Find the device using this unique ID */
for (NextEntry = DeviceExtension->DeviceListHead.Flink;
NextEntry != &(DeviceExtension->DeviceListHead);
NextEntry = NextEntry->Flink)
{
DeviceInformation = CONTAINING_RECORD(NextEntry,
DEVICE_INFORMATION,
DeviceListEntry);
if (DeviceInformation->UniqueId->UniqueIdLength != DatabaseEntry->UniqueIdLength)
{
continue;
}
if (RtlCompareMemory((PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->UniqueIdOffset),
DeviceInformation->UniqueId->UniqueId,
DatabaseEntry->UniqueIdLength) == DatabaseEntry->UniqueIdLength)
{
break;
}
}
/* If found, create a mount point */
if (NextEntry != &(DeviceExtension->DeviceListHead))
{
MountMgrCreatePointWorker(DeviceExtension, &SymbolicString, &(DeviceInformation->DeviceName));
}
return Status;
}
/*
* @implemented
*/
VOID
NTAPI
ReconcileThisDatabaseWithMasterWorker(IN PVOID Parameter)
{
ULONG Offset;
NTSTATUS Status;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
PMOUNTDEV_UNIQUE_ID UniqueId;
PDATABASE_ENTRY DatabaseEntry;
HANDLE DatabaseHandle, Handle;
IO_STATUS_BLOCK IoStatusBlock;
OBJECT_ATTRIBUTES ObjectAttributes;
PDEVICE_INFORMATION ListDeviceInfo;
PLIST_ENTRY Entry, EntryInfo, NextEntry;
PASSOCIATED_DEVICE_ENTRY AssociatedDevice;
BOOLEAN HardwareErrors, Restart, FailedFinding;
WCHAR FileNameBuffer[0x8], SymbolicNameBuffer[100];
UNICODE_STRING ReparseFile, FileName, SymbolicName, VolumeName;
FILE_REPARSE_POINT_INFORMATION ReparsePointInformation, SavedReparsePointInformation;
PDEVICE_EXTENSION DeviceExtension = ((PRECONCILE_WORK_ITEM_CONTEXT)Parameter)->DeviceExtension;
PDEVICE_INFORMATION DeviceInformation = ((PRECONCILE_WORK_ITEM_CONTEXT)Parameter)->DeviceInformation;
/* We're unloading, do nothing */
if (Unloading)
{
return;
}
/* Lock remote DB */
if (!NT_SUCCESS(WaitForRemoteDatabaseSemaphore(DeviceExtension)))
{
return;
}
/* Recheck for unloading */
if (Unloading)
{
goto ReleaseRDS;
}
/* Find the DB to reconcile */
KeWaitForSingleObject(&DeviceExtension->DeviceLock, Executive, KernelMode, FALSE, NULL);
for (Entry = DeviceExtension->DeviceListHead.Flink;
Entry != &DeviceExtension->DeviceListHead;
Entry = Entry->Flink)
{
ListDeviceInfo = CONTAINING_RECORD(Entry, DEVICE_INFORMATION, DeviceListEntry);
if (ListDeviceInfo == DeviceInformation)
{
break;
}
}
/* If not found, or if removable, bail out */
if (Entry == &DeviceExtension->DeviceListHead || DeviceInformation->Removable)
{
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
goto ReleaseRDS;
}
/* Get our device object */
Status = IoGetDeviceObjectPointer(&ListDeviceInfo->DeviceName, FILE_READ_ATTRIBUTES, &FileObject, &DeviceObject);
if (!NT_SUCCESS(Status))
{
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
goto ReleaseRDS;
}
/* Mark mounted only if not unloading */
if (!(DeviceObject->Flags & DO_UNLOAD_PENDING))
{
InterlockedExchangeAdd(&ListDeviceInfo->MountState, 1);
}
ObDereferenceObject(FileObject);
/* Force default: no DB, and need for reconcile */
DeviceInformation->NeedsReconcile = TRUE;
DeviceInformation->NoDatabase = TRUE;
FailedFinding = FALSE;
/* Remove any associated device that refers to the DB to reconcile */
for (Entry = DeviceExtension->DeviceListHead.Flink;
Entry != &DeviceExtension->DeviceListHead;
Entry = Entry->Flink)
{
ListDeviceInfo = CONTAINING_RECORD(Entry, DEVICE_INFORMATION, DeviceListEntry);
EntryInfo = ListDeviceInfo->AssociatedDevicesHead.Flink;
while (EntryInfo != &ListDeviceInfo->AssociatedDevicesHead)
{
AssociatedDevice = CONTAINING_RECORD(EntryInfo, ASSOCIATED_DEVICE_ENTRY, AssociatedDevicesEntry);
NextEntry = EntryInfo->Flink;
if (AssociatedDevice->DeviceInformation == DeviceInformation)
{
RemoveEntryList(&AssociatedDevice->AssociatedDevicesEntry);
FreePool(AssociatedDevice->String.Buffer);
FreePool(AssociatedDevice);
}
EntryInfo = NextEntry;
}
}
/* Open the remote database */
DatabaseHandle = OpenRemoteDatabase(DeviceInformation, FALSE);
/* Prepare a string with reparse point index */
ReparseFile.Length = 0;
ReparseFile.MaximumLength = DeviceInformation->DeviceName.Length
+ ReparseIndex.Length
+ sizeof(UNICODE_NULL);
ReparseFile.Buffer = AllocatePool(ReparseFile.MaximumLength);
if (!ReparseFile.Buffer)
{
if (DatabaseHandle != 0)
{
CloseRemoteDatabase(DatabaseHandle);
}
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
goto ReleaseRDS;
}
RtlAppendUnicodeStringToString(&ReparseFile, &DeviceInformation->DeviceName);
RtlAppendUnicodeStringToString(&ReparseFile, &ReparseIndex);
ReparseFile.Buffer[ReparseFile.Length / sizeof(WCHAR)] = UNICODE_NULL;
InitializeObjectAttributes(&ObjectAttributes,
&ReparseFile,
OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE,
NULL,
NULL);
/* Open reparse point directory */
HardwareErrors = IoSetThreadHardErrorMode(FALSE);
Status = ZwOpenFile(&Handle,
FILE_GENERIC_READ,
&ObjectAttributes,
&IoStatusBlock,
FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_SYNCHRONOUS_IO_ALERT);
IoSetThreadHardErrorMode(HardwareErrors);
FreePool(ReparseFile.Buffer);
if (!NT_SUCCESS(Status))
{
if (DatabaseHandle != 0)
{
TruncateRemoteDatabase(DatabaseHandle, 0);
CloseRemoteDatabase(DatabaseHandle);
}
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
goto ReleaseRDS;
}
/* Query reparse point information
* We only pay attention to mout point
*/
RtlZeroMemory(FileNameBuffer, sizeof(FileNameBuffer));
FileName.Buffer = FileNameBuffer;
FileName.Length = sizeof(FileNameBuffer);
FileName.MaximumLength = sizeof(FileNameBuffer);
((PULONG)FileNameBuffer)[0] = IO_REPARSE_TAG_MOUNT_POINT;
Status = ZwQueryDirectoryFile(Handle,
NULL,
NULL,
NULL,
&IoStatusBlock,
&ReparsePointInformation,
sizeof(FILE_REPARSE_POINT_INFORMATION),
FileReparsePointInformation,
TRUE,
&FileName,
FALSE);
if (!NT_SUCCESS(Status))
{
ZwClose(Handle);
if (DatabaseHandle != 0)
{
TruncateRemoteDatabase(DatabaseHandle, 0);
CloseRemoteDatabase(DatabaseHandle);
}
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
goto ReleaseRDS;
}
/* If we failed to open the remote DB previously,
* retry this time allowing migration (and thus, creation if required)
*/
if (DatabaseHandle == 0)
{
DatabaseHandle = OpenRemoteDatabase(DeviceInformation, TRUE);
if (DatabaseHandle == 0)
{
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
goto ReleaseRDS;
}
}
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
/* Reset all the references to our DB entries */
Offset = 0;
for (;;)
{
DatabaseEntry = GetRemoteDatabaseEntry(DatabaseHandle, Offset);
if (DatabaseEntry == NULL)
{
break;
}
DatabaseEntry->EntryReferences = 0;
Status = WriteRemoteDatabaseEntry(DatabaseHandle, Offset, DatabaseEntry);
if (!NT_SUCCESS(Status))
{
FreePool(DatabaseEntry);
goto CloseReparse;
}
Offset += DatabaseEntry->EntrySize;
FreePool(DatabaseEntry);
}
/* Init string for QueryVolumeName call */
SymbolicName.MaximumLength = sizeof(SymbolicNameBuffer);
SymbolicName.Length = 0;
SymbolicName.Buffer = SymbolicNameBuffer;
Restart = TRUE;
/* Start looping on reparse points */
for (;;)
{
RtlCopyMemory(&SavedReparsePointInformation, &ReparsePointInformation, sizeof(FILE_REPARSE_POINT_INFORMATION));
Status = ZwQueryDirectoryFile(Handle,
NULL,
NULL,
NULL,
&IoStatusBlock,
&ReparsePointInformation,
sizeof(FILE_REPARSE_POINT_INFORMATION),
FileReparsePointInformation,
TRUE,
Restart ? &FileName : NULL,
Restart);
/* Restart only once */
if (Restart)
{
Restart = FALSE;
}
else
{
/* If we get the same one, we're done, bail out */
if (ReparsePointInformation.FileReference == SavedReparsePointInformation.FileReference &&
ReparsePointInformation.Tag == SavedReparsePointInformation.Tag)
{
break;
}
}
/* If querying failed, or if onloading, or if not returning mount points, bail out */
if (!NT_SUCCESS(Status) || Unloading || ReparsePointInformation.Tag != IO_REPARSE_TAG_MOUNT_POINT)
{
break;
}
/* Get the volume name associated to the mount point */
Status = QueryVolumeName(Handle, &ReparsePointInformation, 0, &SymbolicName, &VolumeName);
if (!NT_SUCCESS(Status))
{
continue;
}
/* Browse the DB to find the name */
Offset = 0;
for (;;)
{
UNICODE_STRING DbName;
DatabaseEntry = GetRemoteDatabaseEntry(DatabaseHandle, Offset);
if (DatabaseEntry == NULL)
{
break;
}
DbName.MaximumLength = DatabaseEntry->SymbolicNameLength;
DbName.Length = DbName.MaximumLength;
DbName.Buffer = (PWSTR)((ULONG_PTR)DatabaseEntry + DatabaseEntry->SymbolicNameOffset);
/* Found, we're done! */
if (RtlEqualUnicodeString(&DbName, &SymbolicName, TRUE))
{
break;
}
Offset += DatabaseEntry->EntrySize;
FreePool(DatabaseEntry);
}
/* If we found the mount point.... */
if (DatabaseEntry != NULL)
{
/* If it was referenced, reference it once more and update to remote */
if (DatabaseEntry->EntryReferences)
{
++DatabaseEntry->EntryReferences;
Status = WriteRemoteDatabaseEntry(DatabaseHandle, Offset, DatabaseEntry);
if (!NT_SUCCESS(Status))
{
goto FreeDBEntry;
}
FreePool(DatabaseEntry);
}
else
{
/* Query the Unique ID associated to that mount point in case it changed */
KeWaitForSingleObject(&DeviceExtension->DeviceLock, Executive, KernelMode, FALSE, NULL);
Status = QueryUniqueIdFromMaster(DeviceExtension, &SymbolicName, &UniqueId);
if (!NT_SUCCESS(Status))
{
/* If we failed doing so, reuse the old Unique ID and push it to master */
Status = WriteUniqueIdToMaster(DeviceExtension, DatabaseEntry);
if (!NT_SUCCESS(Status))
{
goto ReleaseDeviceLock;
}
/* And then, reference & write the entry */
++DatabaseEntry->EntryReferences;
Status = WriteRemoteDatabaseEntry(DatabaseHandle, Offset, DatabaseEntry);
if (!NT_SUCCESS(Status))
{
goto ReleaseDeviceLock;
}
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
FreePool(DatabaseEntry);
}
/* If the Unique ID didn't change */
else if (UniqueId->UniqueIdLength == DatabaseEntry->UniqueIdLength &&
RtlCompareMemory(UniqueId->UniqueId,
(PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->UniqueIdOffset),
UniqueId->UniqueIdLength) == UniqueId->UniqueIdLength)
{
/* Reference the entry, and update to remote */
++DatabaseEntry->EntryReferences;
Status = WriteRemoteDatabaseEntry(DatabaseHandle, Offset, DatabaseEntry);
if (!NT_SUCCESS(Status))
{
goto FreeUniqueId;
}
FreePool(UniqueId);
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
FreePool(DatabaseEntry);
}
/* Would, by chance, the Unique ID be present elsewhere? */
else if (IsUniqueIdPresent(DeviceExtension, DatabaseEntry))
{
/* Push the ID to master */
Status = WriteUniqueIdToMaster(DeviceExtension, DatabaseEntry);
if (!NT_SUCCESS(Status))
{
goto FreeUniqueId;
}
/* And then, reference & write the entry */
++DatabaseEntry->EntryReferences;
Status = WriteRemoteDatabaseEntry(DatabaseHandle, Offset, DatabaseEntry);
if (!NT_SUCCESS(Status))
{
goto FreeUniqueId;
}
FreePool(UniqueId);
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
FreePool(DatabaseEntry);
}
else
{
/* OK, at that point, we're facing a totally unknown unique ID
* So, get rid of the old entry, and recreate a new one with
* the know unique ID
*/
Status = DeleteRemoteDatabaseEntry(DatabaseHandle, Offset);
if (!NT_SUCCESS(Status))
{
goto FreeUniqueId;
}
FreePool(DatabaseEntry);
/* Allocate a new entry big enough */
DatabaseEntry = AllocatePool(UniqueId->UniqueIdLength + SymbolicName.Length + sizeof(DATABASE_ENTRY));
if (DatabaseEntry == NULL)
{
goto FreeUniqueId;
}
/* Configure it */
DatabaseEntry->EntrySize = UniqueId->UniqueIdLength + SymbolicName.Length + sizeof(DATABASE_ENTRY);
DatabaseEntry->EntryReferences = 1;
DatabaseEntry->SymbolicNameOffset = sizeof(DATABASE_ENTRY);
DatabaseEntry->SymbolicNameLength = SymbolicName.Length;
DatabaseEntry->UniqueIdOffset = SymbolicName.Length + sizeof(DATABASE_ENTRY);
DatabaseEntry->UniqueIdLength = UniqueId->UniqueIdLength;
RtlCopyMemory((PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->SymbolicNameOffset), SymbolicName.Buffer, DatabaseEntry->SymbolicNameLength);
RtlCopyMemory((PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->UniqueIdOffset), UniqueId->UniqueId, UniqueId->UniqueIdLength);
/* And write it remotely */
Status = AddRemoteDatabaseEntry(DatabaseHandle, DatabaseEntry);
if (!NT_SUCCESS(Status))
{
FreePool(DatabaseEntry);
goto FreeUniqueId;
}
FreePool(UniqueId);
FreePool(DatabaseEntry);
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
}
}
}
else
{
/* We failed finding it remotely
* So, let's allocate a new remote DB entry
*/
KeWaitForSingleObject(&DeviceExtension->DeviceLock, Executive, KernelMode, FALSE, NULL);
/* To be able to do so, we need the device Unique ID, ask master */
Status = QueryUniqueIdFromMaster(DeviceExtension, &SymbolicName, &UniqueId);
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
if (NT_SUCCESS(Status))
{
/* Allocate a new entry big enough */
DatabaseEntry = AllocatePool(UniqueId->UniqueIdLength + SymbolicName.Length + sizeof(DATABASE_ENTRY));
if (DatabaseEntry != NULL)
{
/* Configure it */
DatabaseEntry->EntrySize = UniqueId->UniqueIdLength + SymbolicName.Length + sizeof(DATABASE_ENTRY);
DatabaseEntry->EntryReferences = 1;
DatabaseEntry->SymbolicNameOffset = sizeof(DATABASE_ENTRY);
DatabaseEntry->SymbolicNameLength = SymbolicName.Length;
DatabaseEntry->UniqueIdOffset = SymbolicName.Length + sizeof(DATABASE_ENTRY);
DatabaseEntry->UniqueIdLength = UniqueId->UniqueIdLength;
RtlCopyMemory((PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->SymbolicNameOffset), SymbolicName.Buffer, DatabaseEntry->SymbolicNameLength);
RtlCopyMemory((PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->UniqueIdOffset), UniqueId->UniqueId, UniqueId->UniqueIdLength);
/* And write it remotely */
Status = AddRemoteDatabaseEntry(DatabaseHandle, DatabaseEntry);
FreePool(DatabaseEntry);
FreePool(UniqueId);
if (!NT_SUCCESS(Status))
{
goto FreeVolume;
}
}
else
{
FreePool(UniqueId);
}
}
}
/* Find info about the device associated associated with the mount point */
KeWaitForSingleObject(&DeviceExtension->DeviceLock, Executive, KernelMode, FALSE, NULL);
Status = FindDeviceInfo(DeviceExtension, &SymbolicName, FALSE, &ListDeviceInfo);
if (!NT_SUCCESS(Status))
{
FailedFinding = TRUE;
FreePool(VolumeName.Buffer);
}
else
{
/* Associate the device with the currrent DB */
AssociatedDevice = AllocatePool(sizeof(ASSOCIATED_DEVICE_ENTRY));
if (AssociatedDevice == NULL)
{
FreePool(VolumeName.Buffer);
}
else
{
AssociatedDevice->DeviceInformation = DeviceInformation;
AssociatedDevice->String.Length = VolumeName.Length;
AssociatedDevice->String.MaximumLength = VolumeName.MaximumLength;
AssociatedDevice->String.Buffer = VolumeName.Buffer;
InsertTailList(&ListDeviceInfo->AssociatedDevicesHead, &AssociatedDevice->AssociatedDevicesEntry);
}
/* If we don't have to skip notifications, notify */
if (!ListDeviceInfo->SkipNotifications)
{
PostOnlineNotification(DeviceExtension, &ListDeviceInfo->SymbolicName);
}
}
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
}
/* We don't need mount points any longer */
ZwClose(Handle);
/* Look for the DB again */
KeWaitForSingleObject(&DeviceExtension->DeviceLock, Executive, KernelMode, FALSE, NULL);
for (Entry = DeviceExtension->DeviceListHead.Flink;
Entry != &DeviceExtension->DeviceListHead;
Entry = Entry->Flink)
{
ListDeviceInfo = CONTAINING_RECORD(Entry, DEVICE_INFORMATION, DeviceListEntry);
if (ListDeviceInfo == DeviceInformation)
{
break;
}
}
if (Entry == &DeviceExtension->DeviceListHead)
{
ListDeviceInfo = NULL;
}
/* Start the pruning loop */
Offset = 0;
for (;;)
{
/* Get the entry */
DatabaseEntry = GetRemoteDatabaseEntry(DatabaseHandle, Offset);
if (DatabaseEntry == NULL)
{
break;
}
/* It's not referenced anylonger? Prune it */
if (DatabaseEntry->EntryReferences == 0)
{
Status = DeleteRemoteDatabaseEntry(DatabaseHandle, Offset);
if (!NT_SUCCESS(Status))
{
FreePool(DatabaseEntry);
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
goto CloseRDB;
}
}
/* Update the Unique IDs to reflect the changes we might have done previously */
else
{
if (ListDeviceInfo != NULL)
{
UpdateReplicatedUniqueIds(ListDeviceInfo, DatabaseEntry);
}
Offset += DatabaseEntry->EntrySize;
}
FreePool(DatabaseEntry);
}
/* We do have a DB now :-) */
if (ListDeviceInfo != NULL && !FailedFinding)
{
DeviceInformation->NoDatabase = FALSE;
}
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
goto CloseRDB;
FreeUniqueId:
FreePool(UniqueId);
ReleaseDeviceLock:
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
FreeDBEntry:
FreePool(DatabaseEntry);
FreeVolume:
FreePool(VolumeName.Buffer);
CloseReparse:
ZwClose(Handle);
CloseRDB:
CloseRemoteDatabase(DatabaseHandle);
ReleaseRDS:
ReleaseRemoteDatabaseSemaphore(DeviceExtension);
return;
}
/*
* @implemented
*/
VOID
NTAPI
WorkerThread(IN PDEVICE_OBJECT DeviceObject,
IN PVOID Context)
{
ULONG i;
KEVENT Event;
KIRQL OldIrql;
NTSTATUS Status;
HANDLE SafeEvent;
PLIST_ENTRY Entry;
LARGE_INTEGER Timeout;
PRECONCILE_WORK_ITEM WorkItem;
PDEVICE_EXTENSION DeviceExtension;
OBJECT_ATTRIBUTES ObjectAttributes;
UNREFERENCED_PARAMETER(DeviceObject);
InitializeObjectAttributes(&ObjectAttributes,
&SafeVolumes,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Timeout.QuadPart = -10000000LL; /* Wait for 1 second */
/* Wait as long as possible for clearance from autochk
* We will write remote databases only if it is safe
* to access volumes.
* First, given we start before SMSS, wait for the
* event creation.
*/
i = 0;
do
{
/* If we started to shutdown, stop waiting forever and jump to last attempt */
if (Unloading)
{
i = 999;
}
else
{
/* Attempt to open the event */
Status = ZwOpenEvent(&SafeEvent, EVENT_ALL_ACCESS, &ObjectAttributes);
if (NT_SUCCESS(Status))
{
break;
}
/* Wait a bit to give SMSS a chance to create the event */
KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, &Timeout);
}
++i;
}
while (i < 1000);
/* We managed to open the event, wait until autochk signals it */
if (i < 1000)
{
do
{
Status = ZwWaitForSingleObject(SafeEvent, FALSE, &Timeout);
}
while (Status == STATUS_TIMEOUT && !Unloading);
ZwClose(SafeEvent);
}
DeviceExtension = Context;
InterlockedExchange(&(DeviceExtension->WorkerThreadStatus), 1);
/* Acquire workers lock */
KeWaitForSingleObject(&(DeviceExtension->WorkerSemaphore), Executive, KernelMode, FALSE, NULL);
KeAcquireSpinLock(&(DeviceExtension->WorkerLock), &OldIrql);
/* Ensure there are workers */
while (!IsListEmpty(&(DeviceExtension->WorkerQueueListHead)))
{
/* Unqueue a worker */
Entry = RemoveHeadList(&(DeviceExtension->WorkerQueueListHead));
WorkItem = CONTAINING_RECORD(Entry,
RECONCILE_WORK_ITEM,
WorkerQueueListEntry);
KeReleaseSpinLock(&(DeviceExtension->WorkerLock), OldIrql);
/* Call it */
WorkItem->WorkerRoutine(WorkItem->Context);
IoFreeWorkItem(WorkItem->WorkItem);
FreePool(WorkItem);
if (InterlockedDecrement(&(DeviceExtension->WorkerReferences)) < 0)
{
return;
}
KeWaitForSingleObject(&(DeviceExtension->WorkerSemaphore), Executive, KernelMode, FALSE, NULL);
KeAcquireSpinLock(&(DeviceExtension->WorkerLock), &OldIrql);
}
KeReleaseSpinLock(&(DeviceExtension->WorkerLock), OldIrql);
InterlockedDecrement(&(DeviceExtension->WorkerReferences));
/* Reset event */
KeSetEvent(&UnloadEvent, IO_NO_INCREMENT, FALSE);
}
/*
* @implemented
*/
NTSTATUS
QueueWorkItem(IN PDEVICE_EXTENSION DeviceExtension,
IN PRECONCILE_WORK_ITEM WorkItem,
IN PVOID Context)
{
KIRQL OldIrql;
WorkItem->Context = Context;
/* When called, lock is already acquired */
/* If noone (-1 as references), start to work */
if (InterlockedIncrement(&(DeviceExtension->WorkerReferences)) == 0)
{
IoQueueWorkItem(WorkItem->WorkItem, WorkerThread, DelayedWorkQueue, DeviceExtension);
}
/* Otherwise queue worker for delayed execution */
KeAcquireSpinLock(&(DeviceExtension->WorkerLock), &OldIrql);
InsertTailList(&(DeviceExtension->WorkerQueueListHead),
&(WorkItem->WorkerQueueListEntry));
KeReleaseSpinLock(&(DeviceExtension->WorkerLock), OldIrql);
KeReleaseSemaphore(&(DeviceExtension->WorkerSemaphore), IO_NO_INCREMENT, 1, FALSE);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
QueryVolumeName(IN HANDLE RootDirectory,
IN PFILE_REPARSE_POINT_INFORMATION ReparsePointInformation,
IN PUNICODE_STRING FileName OPTIONAL,
OUT PUNICODE_STRING SymbolicName,
OUT PUNICODE_STRING VolumeName)
{
HANDLE Handle;
NTSTATUS Status;
ULONG NeededLength;
IO_STATUS_BLOCK IoStatusBlock;
OBJECT_ATTRIBUTES ObjectAttributes;
PFILE_NAME_INFORMATION FileNameInfo;
PREPARSE_DATA_BUFFER ReparseDataBuffer;
UNREFERENCED_PARAMETER(ReparsePointInformation);
if (!FileName)
{
InitializeObjectAttributes(&ObjectAttributes,
NULL,
OBJ_KERNEL_HANDLE,
RootDirectory,
NULL);
}
else
{
InitializeObjectAttributes(&ObjectAttributes,
FileName,
OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE,
NULL,
NULL);
}
/* Open volume */
Status = ZwOpenFile(&Handle,
SYNCHRONIZE | FILE_READ_ATTRIBUTES,
&ObjectAttributes,
&IoStatusBlock,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
(FileName) ? FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT :
FILE_OPEN_BY_FILE_ID | FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT);
if (!NT_SUCCESS(Status))
{
return Status;
}
/* Get the reparse point data */
ReparseDataBuffer = AllocatePool(MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
if (!ReparseDataBuffer)
{
ZwClose(Handle);
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ZwFsControlFile(Handle,
0,
NULL,
NULL,
&IoStatusBlock,
FSCTL_GET_REPARSE_POINT,
NULL,
0,
ReparseDataBuffer,
MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
if (!NT_SUCCESS(Status))
{
FreePool(ReparseDataBuffer);
ZwClose(Handle);
return Status;
}
/* Check that name can fit in buffer */
if (ReparseDataBuffer->MountPointReparseBuffer.SubstituteNameLength + sizeof(UNICODE_NULL) > SymbolicName->MaximumLength)
{
FreePool(ReparseDataBuffer);
ZwClose(Handle);
return STATUS_BUFFER_TOO_SMALL;
}
/* Copy symbolic name */
SymbolicName->Length = ReparseDataBuffer->MountPointReparseBuffer.SubstituteNameLength;
RtlCopyMemory(SymbolicName->Buffer,
(PWSTR)((ULONG_PTR)ReparseDataBuffer->MountPointReparseBuffer.PathBuffer +
ReparseDataBuffer->MountPointReparseBuffer.SubstituteNameOffset),
ReparseDataBuffer->MountPointReparseBuffer.SubstituteNameLength);
FreePool(ReparseDataBuffer);
/* Name has to \ terminated */
if (SymbolicName->Buffer[SymbolicName->Length / sizeof(WCHAR) - 1] != L'\\')
{
ZwClose(Handle);
return STATUS_INVALID_PARAMETER;
}
/* So that we can delete it, and match mountmgr requirements */
SymbolicName->Length -= sizeof(WCHAR);
SymbolicName->Buffer[SymbolicName->Length / sizeof(WCHAR)] = UNICODE_NULL;
/* Also ensure it's really a volume name... */
if (!MOUNTMGR_IS_VOLUME_NAME(SymbolicName))
{
ZwClose(Handle);
return STATUS_INVALID_PARAMETER;
}
/* Now prepare to really get the name */
FileNameInfo = AllocatePool(sizeof(FILE_NAME_INFORMATION) + 2 * sizeof(WCHAR));
if (!FileNameInfo)
{
ZwClose(Handle);
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = ZwQueryInformationFile(Handle,
&IoStatusBlock,
FileNameInfo,
sizeof(FILE_NAME_INFORMATION) + 2 * sizeof(WCHAR),
FileNameInformation);
if (Status == STATUS_BUFFER_OVERFLOW)
{
/* As expected... Reallocate with proper size */
NeededLength = FileNameInfo->FileNameLength;
FreePool(FileNameInfo);
FileNameInfo = AllocatePool(sizeof(FILE_NAME_INFORMATION) + NeededLength);
if (!FileNameInfo)
{
ZwClose(Handle);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* And query name */
Status = ZwQueryInformationFile(Handle,
&IoStatusBlock,
FileNameInfo,
sizeof(FILE_NAME_INFORMATION) + NeededLength,
FileNameInformation);
}
ZwClose(Handle);
if (!NT_SUCCESS(Status))
{
return Status;
}
/* Return the volume name */
VolumeName->Length = (USHORT)FileNameInfo->FileNameLength;
VolumeName->MaximumLength = (USHORT)FileNameInfo->FileNameLength + sizeof(WCHAR);
VolumeName->Buffer = AllocatePool(VolumeName->MaximumLength);
if (!VolumeName->Buffer)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(VolumeName->Buffer, FileNameInfo->FileName, FileNameInfo->FileNameLength);
VolumeName->Buffer[FileNameInfo->FileNameLength / sizeof(WCHAR)] = UNICODE_NULL;
FreePool(FileNameInfo);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
VOID
OnlineMountedVolumes(IN PDEVICE_EXTENSION DeviceExtension,
IN PDEVICE_INFORMATION DeviceInformation)
{
HANDLE Handle;
NTSTATUS Status;
BOOLEAN RestartScan;
IO_STATUS_BLOCK IoStatusBlock;
OBJECT_ATTRIBUTES ObjectAttributes;
PDEVICE_INFORMATION VolumeDeviceInformation;
WCHAR FileNameBuffer[0x8], SymbolicNameBuffer[0x64];
UNICODE_STRING ReparseFile, FileName, SymbolicName, VolumeName;
FILE_REPARSE_POINT_INFORMATION ReparsePointInformation, SavedReparsePointInformation;
/* Removable devices don't have remote database on them */
if (DeviceInformation->Removable)
{
return;
}
/* Prepare a string with reparse point index */
ReparseFile.Length = 0;
ReparseFile.MaximumLength = DeviceInformation->DeviceName.Length
+ ReparseIndex.Length
+ sizeof(UNICODE_NULL);
ReparseFile.Buffer = AllocatePool(ReparseFile.MaximumLength);
if (!ReparseFile.Buffer)
{
return;
}
RtlAppendUnicodeStringToString(&ReparseFile, &DeviceInformation->DeviceName);
RtlAppendUnicodeStringToString(&ReparseFile, &ReparseIndex);
ReparseFile.Buffer[ReparseFile.Length / sizeof(WCHAR)] = UNICODE_NULL;
InitializeObjectAttributes(&ObjectAttributes,
&ReparseFile,
OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE,
NULL,
NULL);
/* Open reparse point */
Status = ZwOpenFile(&Handle,
FILE_GENERIC_READ,
&ObjectAttributes,
&IoStatusBlock,
FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_SYNCHRONOUS_IO_ALERT | FILE_OPEN_REPARSE_POINT);
FreePool(ReparseFile.Buffer);
if (!NT_SUCCESS(Status))
{
DeviceInformation->NoDatabase = FALSE;
return;
}
/* Query reparse point information
* We only pay attention to mout point
*/
RtlZeroMemory(FileNameBuffer, sizeof(FileNameBuffer));
FileName.Buffer = FileNameBuffer;
FileName.Length = sizeof(FileNameBuffer);
FileName.MaximumLength = sizeof(FileNameBuffer);
((PULONG)FileNameBuffer)[0] = IO_REPARSE_TAG_MOUNT_POINT;
Status = ZwQueryDirectoryFile(Handle,
NULL,
NULL,
NULL,
&IoStatusBlock,
&ReparsePointInformation,
sizeof(FILE_REPARSE_POINT_INFORMATION),
FileReparsePointInformation,
TRUE,
&FileName,
FALSE);
if (!NT_SUCCESS(Status))
{
ZwClose(Handle);
return;
}
RestartScan = TRUE;
/* Query mount points */
while (TRUE)
{
SymbolicName.Length = 0;
SymbolicName.MaximumLength = sizeof(SymbolicNameBuffer);
SymbolicName.Buffer = SymbolicNameBuffer;
RtlCopyMemory(&SavedReparsePointInformation, &ReparsePointInformation, sizeof(FILE_REPARSE_POINT_INFORMATION));
Status = ZwQueryDirectoryFile(Handle,
NULL,
NULL,
NULL,
&IoStatusBlock,
&ReparsePointInformation,
sizeof(FILE_REPARSE_POINT_INFORMATION),
FileReparsePointInformation,
TRUE,
(RestartScan) ? &FileName : NULL,
RestartScan);
if (!RestartScan)
{
if (ReparsePointInformation.FileReference == SavedReparsePointInformation.FileReference &&
ReparsePointInformation.Tag == SavedReparsePointInformation.Tag)
{
break;
}
}
else
{
RestartScan = FALSE;
}
if (!NT_SUCCESS(Status) || ReparsePointInformation.Tag != IO_REPARSE_TAG_MOUNT_POINT)
{
break;
}
/* Get the volume name associated to the mount point */
Status = QueryVolumeName(Handle,
&ReparsePointInformation,
NULL, &SymbolicName,
&VolumeName);
if (!NT_SUCCESS(Status))
{
continue;
}
FreePool(VolumeName.Buffer);
/* Get its information */
Status = FindDeviceInfo(DeviceExtension, &SymbolicName,
FALSE, &VolumeDeviceInformation);
if (!NT_SUCCESS(Status))
{
DeviceInformation->NoDatabase = TRUE;
continue;
}
/* If notification are enabled, mark it online */
if (!DeviceInformation->SkipNotifications)
{
PostOnlineNotification(DeviceExtension, &VolumeDeviceInformation->SymbolicName);
}
}
ZwClose(Handle);
}
/*
* @implemented
*/
VOID
ReconcileThisDatabaseWithMaster(IN PDEVICE_EXTENSION DeviceExtension,
IN PDEVICE_INFORMATION DeviceInformation)
{
PRECONCILE_WORK_ITEM WorkItem;
/* Removable devices don't have remote database */
if (DeviceInformation->Removable)
{
return;
}
/* Allocate a work item */
WorkItem = AllocatePool(sizeof(RECONCILE_WORK_ITEM));
if (!WorkItem)
{
return;
}
WorkItem->WorkItem = IoAllocateWorkItem(DeviceExtension->DeviceObject);
if (!WorkItem->WorkItem)
{
FreePool(WorkItem);
return;
}
/* And queue it */
WorkItem->WorkerRoutine = ReconcileThisDatabaseWithMasterWorker;
WorkItem->DeviceExtension = DeviceExtension;
WorkItem->DeviceInformation = DeviceInformation;
QueueWorkItem(DeviceExtension, WorkItem, &(WorkItem->DeviceExtension));
/* If there's no automount, and automatic letters
* all volumes to find those online and notify there presence
*/
if (DeviceExtension->WorkerThreadStatus == 0 &&
DeviceExtension->AutomaticDriveLetter == 1 &&
DeviceExtension->NoAutoMount == FALSE)
{
OnlineMountedVolumes(DeviceExtension, DeviceInformation);
}
}
/*
* @implemented
*/
VOID
ReconcileAllDatabasesWithMaster(IN PDEVICE_EXTENSION DeviceExtension)
{
PLIST_ENTRY NextEntry;
PDEVICE_INFORMATION DeviceInformation;
/* Browse all the devices */
for (NextEntry = DeviceExtension->DeviceListHead.Flink;
NextEntry != &(DeviceExtension->DeviceListHead);
NextEntry = NextEntry->Flink)
{
DeviceInformation = CONTAINING_RECORD(NextEntry,
DEVICE_INFORMATION,
DeviceListEntry);
/* If it's not removable, then, it might have a database to sync */
if (!DeviceInformation->Removable)
{
ReconcileThisDatabaseWithMaster(DeviceExtension, DeviceInformation);
}
}
}
/*
* @implemented
*/
VOID
NTAPI
CreateRemoteDatabaseWorker(IN PDEVICE_OBJECT DeviceObject,
IN PVOID Context)
{
NTSTATUS Status;
HANDLE Database = 0;
UNICODE_STRING DatabaseName;
PMIGRATE_WORK_ITEM WorkItem;
IO_STATUS_BLOCK IoStatusBlock;
OBJECT_ATTRIBUTES ObjectAttributes;
PDEVICE_INFORMATION DeviceInformation;
UNREFERENCED_PARAMETER(DeviceObject);
/* Extract context */
WorkItem = Context;
DeviceInformation = WorkItem->DeviceInformation;
/* Reconstruct appropriate string */
DatabaseName.Length = 0;
DatabaseName.MaximumLength = DeviceInformation->DeviceName.Length
+ RemoteDatabase.Length
+ sizeof(UNICODE_NULL);
DatabaseName.Buffer = AllocatePool(DatabaseName.MaximumLength);
if (DatabaseName.Buffer == NULL)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Cleanup;
}
/* Create the required folder (in which the database will be stored
* \System Volume Information at root of the volume
*/
Status = RtlCreateSystemVolumeInformationFolder(&(DeviceInformation->DeviceName));
if (!NT_SUCCESS(Status))
{
goto Cleanup;
}
/* Finish initiating strings */
RtlAppendUnicodeStringToString(&DatabaseName, &DeviceInformation->DeviceName);
RtlAppendUnicodeStringToString(&DatabaseName, &RemoteDatabase);
DatabaseName.Buffer[DatabaseName.Length / sizeof(WCHAR)] = UNICODE_NULL;
/* Create database */
InitializeObjectAttributes(&ObjectAttributes,
&DatabaseName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
Status = IoCreateFile(&Database,
SYNCHRONIZE | READ_CONTROL | FILE_WRITE_ATTRIBUTES |
FILE_READ_ATTRIBUTES | FILE_WRITE_EA | FILE_READ_EA |
FILE_APPEND_DATA | FILE_WRITE_DATA | FILE_READ_DATA,
&ObjectAttributes,
&IoStatusBlock,
NULL,
FILE_ATTRIBUTE_NORMAL | FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN,
0,
FILE_CREATE,
FILE_NON_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_ALERT,
NULL,
0,
CreateFileTypeNone,
NULL,
IO_STOP_ON_SYMLINK | IO_NO_PARAMETER_CHECKING);
if (!NT_SUCCESS(Status))
{
if (Status == STATUS_STOPPED_ON_SYMLINK)
{
DPRINT1("Attempt to exploit CVE-2015-1769. See CORE-10216\n");
}
Database = 0;
goto Cleanup;
}
Cleanup:
if (DatabaseName.Buffer)
{
FreePool(DatabaseName.Buffer);
}
if (NT_SUCCESS(Status))
{
DeviceInformation->Migrated = 1;
}
else if (Database != 0)
{
ZwClose(Database);
}
IoFreeWorkItem(WorkItem->WorkItem);
WorkItem->WorkItem = NULL;
WorkItem->Status = Status;
WorkItem->Database = Database;
KeSetEvent(WorkItem->Event, 0, FALSE);
}
/*
* @implemented
*/
NTSTATUS
CreateRemoteDatabase(IN PDEVICE_INFORMATION DeviceInformation,
IN OUT PHANDLE Database)
{
KEVENT Event;
NTSTATUS Status;
PMIGRATE_WORK_ITEM WorkItem;
KeInitializeEvent(&Event, NotificationEvent, FALSE);
/* Allocate a work item dedicated to migration */
WorkItem = AllocatePool(sizeof(MIGRATE_WORK_ITEM));
if (!WorkItem)
{
*Database = 0;
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlZeroMemory(WorkItem, sizeof(MIGRATE_WORK_ITEM));
WorkItem->Event = &Event;
WorkItem->DeviceInformation = DeviceInformation;
WorkItem->WorkItem = IoAllocateWorkItem(DeviceInformation->DeviceExtension->DeviceObject);
if (!WorkItem->WorkItem)
{
FreePool(WorkItem);
*Database = 0;
return STATUS_INSUFFICIENT_RESOURCES;
}
/* And queue it */
IoQueueWorkItem(WorkItem->WorkItem,
CreateRemoteDatabaseWorker,
DelayedWorkQueue,
WorkItem);
KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
Status = WorkItem->Status;
*Database = (NT_SUCCESS(Status) ? WorkItem->Database : 0);
FreePool(WorkItem);
return Status;
}
/*
* @implemented
*/
HANDLE
OpenRemoteDatabase(IN PDEVICE_INFORMATION DeviceInformation,
IN BOOLEAN MigrateDatabase)
{
HANDLE Database;
NTSTATUS Status;
BOOLEAN PreviousMode;
IO_STATUS_BLOCK IoStatusBlock;
OBJECT_ATTRIBUTES ObjectAttributes;
UNICODE_STRING DeviceRemoteDatabase;
Database = 0;
/* Get database name */
DeviceRemoteDatabase.Length = 0;
DeviceRemoteDatabase.MaximumLength = DeviceInformation->DeviceName.Length
+ RemoteDatabase.Length
+ sizeof(UNICODE_NULL);
DeviceRemoteDatabase.Buffer = AllocatePool(DeviceRemoteDatabase.MaximumLength);
if (!DeviceRemoteDatabase.Buffer)
{
return 0;
}
RtlAppendUnicodeStringToString(&DeviceRemoteDatabase, &DeviceInformation->DeviceName);
RtlAppendUnicodeStringToString(&DeviceRemoteDatabase, &RemoteDatabase);
DeviceRemoteDatabase.Buffer[DeviceRemoteDatabase.Length / sizeof(WCHAR)] = UNICODE_NULL;
/* Open database */
InitializeObjectAttributes(&ObjectAttributes,
&DeviceRemoteDatabase,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
/* Disable hard errors */
PreviousMode = IoSetThreadHardErrorMode(FALSE);
Status = IoCreateFile(&Database,
SYNCHRONIZE | READ_CONTROL | FILE_WRITE_ATTRIBUTES |
FILE_READ_ATTRIBUTES | FILE_WRITE_EA | FILE_READ_EA |
FILE_APPEND_DATA | FILE_WRITE_DATA | FILE_READ_DATA,
&ObjectAttributes,
&IoStatusBlock,
NULL,
FILE_ATTRIBUTE_NORMAL | FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN,
0,
(!MigrateDatabase || DeviceInformation->Migrated == 0) ? FILE_OPEN_IF : FILE_OPEN,
FILE_NON_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_ALERT,
NULL,
0,
CreateFileTypeNone,
NULL,
IO_STOP_ON_SYMLINK | IO_NO_PARAMETER_CHECKING);
if (Status == STATUS_STOPPED_ON_SYMLINK)
{
DPRINT1("Attempt to exploit CVE-2015-1769. See CORE-10216\n");
}
/* If base it to be migrated and was opened successfully, go ahead */
if (MigrateDatabase && NT_SUCCESS(Status))
{
CreateRemoteDatabase(DeviceInformation, &Database);
}
IoSetThreadHardErrorMode(PreviousMode);
FreePool(DeviceRemoteDatabase.Buffer);
return Database;
}
/*
* @implemented
*/
VOID
ChangeRemoteDatabaseUniqueId(IN PDEVICE_INFORMATION DeviceInformation,
IN PMOUNTDEV_UNIQUE_ID OldUniqueId,
IN PMOUNTDEV_UNIQUE_ID NewUniqueId)
{
LONG Offset = 0;
HANDLE Database;
PDATABASE_ENTRY Entry, NewEntry;
NTSTATUS Status = STATUS_SUCCESS;
/* Open the remote database */
Database = OpenRemoteDatabase(DeviceInformation, FALSE);
if (!Database)
{
return;
}
/* Get all the entries */
do
{
Entry = GetRemoteDatabaseEntry(Database, Offset);
if (!Entry)
{
break;
}
/* Not the correct entry, skip it */
if (Entry->UniqueIdLength != OldUniqueId->UniqueIdLength)
{
Offset += Entry->EntrySize;
FreePool(Entry);
continue;
}
/* Not the correct entry, skip it */
if (RtlCompareMemory(OldUniqueId->UniqueId,
(PVOID)((ULONG_PTR)Entry + Entry->UniqueIdOffset),
Entry->UniqueIdLength) != Entry->UniqueIdLength)
{
Offset += Entry->EntrySize;
FreePool(Entry);
continue;
}
/* Here, we have the correct entry */
NewEntry = AllocatePool(Entry->EntrySize + NewUniqueId->UniqueIdLength - OldUniqueId->UniqueIdLength);
if (!NewEntry)
{
Offset += Entry->EntrySize;
FreePool(Entry);
continue;
}
/* Recreate the entry from the previous one */
NewEntry->EntrySize = Entry->EntrySize + NewUniqueId->UniqueIdLength - OldUniqueId->UniqueIdLength;
NewEntry->EntryReferences = Entry->EntryReferences;
NewEntry->SymbolicNameOffset = sizeof(DATABASE_ENTRY);
NewEntry->SymbolicNameLength = Entry->SymbolicNameLength;
NewEntry->UniqueIdOffset = Entry->SymbolicNameLength + sizeof(DATABASE_ENTRY);
NewEntry->UniqueIdLength = NewUniqueId->UniqueIdLength;
RtlCopyMemory((PVOID)((ULONG_PTR)NewEntry + NewEntry->SymbolicNameOffset),
(PVOID)((ULONG_PTR)Entry + Entry->SymbolicNameOffset),
NewEntry->SymbolicNameLength);
RtlCopyMemory((PVOID)((ULONG_PTR)NewEntry + NewEntry->UniqueIdOffset),
NewUniqueId->UniqueId, NewEntry->UniqueIdLength);
/* Delete old entry */
Status = DeleteRemoteDatabaseEntry(Database, Offset);
if (!NT_SUCCESS(Status))
{
FreePool(Entry);
FreePool(NewEntry);
break;
}
/* And replace with new one */
Status = AddRemoteDatabaseEntry(Database, NewEntry);
FreePool(Entry);
FreePool(NewEntry);
} while (NT_SUCCESS(Status));
CloseRemoteDatabase(Database);
return;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
DeleteDriveLetterRoutine(IN PWSTR ValueName,
IN ULONG ValueType,
IN PVOID ValueData,
IN ULONG ValueLength,
IN PVOID Context,
IN PVOID EntryContext)
{
PMOUNTDEV_UNIQUE_ID UniqueId;
UNICODE_STRING RegistryEntry;
UNREFERENCED_PARAMETER(EntryContext);
if (ValueType != REG_BINARY)
{
return STATUS_SUCCESS;
}
UniqueId = Context;
/* First ensure we have the correct data */
if (UniqueId->UniqueIdLength != ValueLength)
{
return STATUS_SUCCESS;
}
if (RtlCompareMemory(UniqueId->UniqueId, ValueData, ValueLength) != ValueLength)
{
return STATUS_SUCCESS;
}
RtlInitUnicodeString(&RegistryEntry, ValueName);
/* Then, it's a drive letter, erase it */
if (IsDriveLetter(&RegistryEntry))
{
RtlDeleteRegistryValue(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
ValueName);
}
return STATUS_SUCCESS;
}
/*
* @implemented
*/
VOID
DeleteRegistryDriveLetter(IN PMOUNTDEV_UNIQUE_ID UniqueId)
{
RTL_QUERY_REGISTRY_TABLE QueryTable[2];
RtlZeroMemory(QueryTable, sizeof(QueryTable));
QueryTable[0].QueryRoutine = DeleteDriveLetterRoutine;
RtlQueryRegistryValues(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
QueryTable,
UniqueId,
NULL);
}
/*
* @implemented
*/
NTSTATUS
NTAPI
DeleteNoDriveLetterEntryRoutine(IN PWSTR ValueName,
IN ULONG ValueType,
IN PVOID ValueData,
IN ULONG ValueLength,
IN PVOID Context,
IN PVOID EntryContext)
{
PMOUNTDEV_UNIQUE_ID UniqueId = Context;
UNREFERENCED_PARAMETER(EntryContext);
/* Ensure we have correct input */
if (ValueName[0] != L'#' || ValueType != REG_BINARY ||
UniqueId->UniqueIdLength != ValueLength)
{
return STATUS_SUCCESS;
}
/* And then, if unique ID matching, delete entry */
if (RtlCompareMemory(UniqueId->UniqueId, ValueData, ValueLength) != ValueLength)
{
RtlDeleteRegistryValue(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
ValueName);
}
return STATUS_SUCCESS;
}
/*
* @implemented
*/
VOID
DeleteNoDriveLetterEntry(IN PMOUNTDEV_UNIQUE_ID UniqueId)
{
RTL_QUERY_REGISTRY_TABLE QueryTable[2];
RtlZeroMemory(QueryTable, sizeof(QueryTable));
QueryTable[0].QueryRoutine = DeleteNoDriveLetterEntryRoutine;
RtlQueryRegistryValues(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
QueryTable,
UniqueId,
NULL);
}
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