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sys: FspFsvolFileSystemControlReparsePoint: improve computation of TargetOnFileSystem field when MUP is being used

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This commit is contained in:
Bill Zissimopoulos
2016-09-12 15:11:45 -07:00
parent 30f2807e2b
commit be8c29114a
3 changed files with 59 additions and 17 deletions
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53
src/sys/fsctl.c
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@ -150,19 +150,62 @@ static NTSTATUS FspFsvolFileSystemControlReparsePoint(
{
UNICODE_STRING TargetObjectName;
PDEVICE_OBJECT TargetDeviceObject;
PFILE_OBJECT TargetFileObject;
ULONG TargetFileNameIndex;
ULONG32 TargetProviderId;
FSRTL_MUP_PROVIDER_INFO_LEVEL_1 ProviderInfo;
ULONG ProviderInfoSize;
TargetObjectName.Length = TargetObjectName.MaximumLength = ReparseTargetPathLength;
TargetObjectName.Buffer = ReparseTargetPath;
Result = FspGetDeviceObjectByName(&TargetObjectName, FILE_READ_DATA,
&TargetFileNameIndex, &TargetDeviceObject);
Result = FspGetDeviceObjectPointer(&TargetObjectName, FILE_READ_DATA,
&TargetFileNameIndex, &TargetFileObject, &TargetDeviceObject);
if (!NT_SUCCESS(Result))
goto target_check_exit;
TargetOnFileSystem = IoGetRelatedDeviceObject(FileObject) == TargetDeviceObject ?
(UINT16)TargetFileNameIndex : 0;
ObDereferenceObject(TargetDeviceObject);
if (TargetFileNameIndex < ReparseTargetPathLength &&
IoGetRelatedDeviceObject(FileObject) == TargetDeviceObject)
{
if (0 == FsvolDeviceExtension->VolumePrefix.Length)
TargetOnFileSystem = (UINT16)TargetFileNameIndex;
else
{
ProviderInfoSize = sizeof ProviderInfo;
Result = FsRtlMupGetProviderInfoFromFileObject(TargetFileObject, 1,
&ProviderInfo, &ProviderInfoSize);
if (NT_SUCCESS(Result))
{
TargetProviderId = ProviderInfo.ProviderId;
ProviderInfoSize = sizeof ProviderInfo;
Result = FsRtlMupGetProviderInfoFromFileObject(FileObject, 1,
&ProviderInfo, &ProviderInfoSize);
if (!NT_SUCCESS(Result))
goto target_check_exit;
if (ProviderInfo.ProviderId == TargetProviderId)
TargetOnFileSystem = (UINT16)TargetFileNameIndex;
}
else
{
TargetObjectName.Length = TargetObjectName.MaximumLength =
FsvolDeviceExtension->VolumePrefix.Length;
TargetObjectName.Buffer = ReparseTargetPath +
TargetFileNameIndex / sizeof(WCHAR);
TargetFileNameIndex += FsvolDeviceExtension->VolumePrefix.Length;
if (TargetFileNameIndex < ReparseTargetPathLength &&
RtlEqualUnicodeString(&FsvolDeviceExtension->VolumePrefix,
&TargetObjectName,
FSP_VOLUME_PREFIX_CASE_INS))
TargetOnFileSystem = (UINT16)TargetFileNameIndex;
}
}
}
ObDereferenceObject(TargetFileObject);
target_check_exit:
;