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[NTFS] - Disable write support by default. Enable it via the registry.

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[BOOTDATA] - Add a commented-out section to hivesys.inf which can add the required key to enable NTFS write support.

svn path=/branches/GSoC_2016/NTFS/; revision=74685
This commit is contained in:
Trevor Thompson 2017-05-27 19:32:43 +00:00 • committed by Thomas Faber
parent 7f762aac01
commit 037d88201d
5 changed files with 75 additions and 4 deletions
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2
boot/bootdata/hivesys.inf
View file

@ -1605,6 +1605,8 @@ HKLM,"SYSTEM\CurrentControlSet\Services\Ntfs","Group",0x00000000,"File System"
HKLM,"SYSTEM\CurrentControlSet\Services\Ntfs","ImagePath",0x00020000,"system32\drivers\ntfs.sys"
HKLM,"SYSTEM\CurrentControlSet\Services\Ntfs","Start",0x00010001,0x00000003
HKLM,"SYSTEM\CurrentControlSet\Services\Ntfs","Type",0x00010001,0x00000002
; un-comment the line below to enable EXPERIMENTAL write-support on NTFS volumes:
;HKLM,"SYSTEM\CurrentControlSet\Services\Ntfs","MyDataDoesNotMatterSoEnableExperimentalWriteSupportForEveryNTFSVolume",0x00010001,0x00000001
; Null device driver
HKLM,"SYSTEM\CurrentControlSet\Services\Null","ErrorControl",0x00010001,0x00000000

16
drivers/filesystems/ntfs/create.c
View file

@ -486,6 +486,13 @@ NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
LARGE_INTEGER Zero;
Zero.QuadPart = 0;
if (!NtfsGlobalData->EnableWriteSupport)
{
DPRINT1("NTFS write-support is EXPERIMENTAL and is disabled by default!\n");
NtfsCloseFile(DeviceExt, FileObject);
return STATUS_ACCESS_DENIED;
}
// TODO: check for appropriate access
ExAcquireResourceExclusiveLite(&(Fcb->MainResource), TRUE);
@ -545,7 +552,14 @@ NtfsCreateFile(PDEVICE_OBJECT DeviceObject,
RequestedDisposition == FILE_OPEN_IF ||
RequestedDisposition == FILE_OVERWRITE_IF ||
RequestedDisposition == FILE_SUPERSEDE)
{
{
if (!NtfsGlobalData->EnableWriteSupport)
{
DPRINT1("NTFS write-support is EXPERIMENTAL and is disabled by default!\n");
NtfsCloseFile(DeviceExt, FileObject);
return STATUS_ACCESS_DENIED;
}
// Create the file record on disk
Status = NtfsCreateFileRecord(DeviceExt, FileObject);

20
drivers/filesystems/ntfs/dispatch.c
View file

@ -82,7 +82,15 @@ NtfsDispatch(PNTFS_IRP_CONTEXT IrpContext)
break;
case IRP_MJ_SET_INFORMATION:
Status = NtfsSetInformation(IrpContext);
if (!NtfsGlobalData->EnableWriteSupport)
{
DPRINT1("NTFS write-support is EXPERIMENTAL and is disabled by default!\n");
Status = STATUS_ACCESS_DENIED;
}
else
{
Status = NtfsSetInformation(IrpContext);
}
break;
case IRP_MJ_DIRECTORY_CONTROL:
@ -98,7 +106,15 @@ NtfsDispatch(PNTFS_IRP_CONTEXT IrpContext)
break;
case IRP_MJ_WRITE:
Status = NtfsWrite(IrpContext);
if (!NtfsGlobalData->EnableWriteSupport)
{
DPRINT1("NTFS write-support is EXPERIMENTAL and is disabled by default!\n");
Status = STATUS_ACCESS_DENIED;
}
else
{
Status = NtfsWrite(IrpContext);
}
break;
case IRP_MJ_CLOSE:

40
drivers/filesystems/ntfs/ntfs.c
View file

@ -58,6 +58,8 @@ DriverEntry(PDRIVER_OBJECT DriverObject,
UNICODE_STRING DeviceName = RTL_CONSTANT_STRING(DEVICE_NAME);
NTSTATUS Status;
PDEVICE_OBJECT DeviceObject;
OBJECT_ATTRIBUTES Attributes;
HANDLE DriverKey = NULL;
TRACE_(NTFS, "DriverEntry(%p, '%wZ')\n", DriverObject, RegistryPath);
@ -84,6 +86,42 @@ DriverEntry(PDRIVER_OBJECT DriverObject,
ExInitializeResourceLite(&NtfsGlobalData->Resource);
NtfsGlobalData->EnableWriteSupport = FALSE;
// Read registry to determine if write support should be enabled
InitializeObjectAttributes(&Attributes,
RegistryPath,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
Status = ZwOpenKey(&DriverKey, KEY_READ, &Attributes);
if (NT_SUCCESS(Status))
{
UNICODE_STRING ValueName;
UCHAR Buffer[sizeof(KEY_VALUE_PARTIAL_INFORMATION) + sizeof(ULONG)];
PKEY_VALUE_PARTIAL_INFORMATION Value = (PKEY_VALUE_PARTIAL_INFORMATION)Buffer;
ULONG ValueLength = sizeof(Buffer);
ULONG ResultLength;
RtlInitUnicodeString(&ValueName, L"MyDataDoesNotMatterSoEnableExperimentalWriteSupportForEveryNTFSVolume");
Status = ZwQueryValueKey(DriverKey,
&ValueName,
KeyValuePartialInformation,
Value,
ValueLength,
&ResultLength);
if (NT_SUCCESS(Status) && Value->Data[0] == TRUE)
{
DPRINT1("\tEnabling write support on ALL NTFS volumes!\n");
NtfsGlobalData->EnableWriteSupport = TRUE;
}
ZwClose(DriverKey);
}
/* Keep trace of Driver Object */
NtfsGlobalData->DriverObject = DriverObject;
@ -118,7 +156,7 @@ DriverEntry(PDRIVER_OBJECT DriverObject,
IoRegisterFileSystem(NtfsGlobalData->DeviceObject);
ObReferenceObject(NtfsGlobalData->DeviceObject);
return Status;
return STATUS_SUCCESS;
}

1
drivers/filesystems/ntfs/ntfs.h
View file

@ -151,6 +151,7 @@ typedef struct
FAST_IO_DISPATCH FastIoDispatch;
NPAGED_LOOKASIDE_LIST IrpContextLookasideList;
NPAGED_LOOKASIDE_LIST FcbLookasideList;
BOOLEAN EnableWriteSupport;
} NTFS_GLOBAL_DATA, *PNTFS_GLOBAL_DATA;