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sys,dll: reparse point testing

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This commit is contained in:
Bill Zissimopoulos
2016-09-10 23:00:55 -07:00
parent 0d25e73364
commit af2cc10c15
8 changed files with 171 additions and 112 deletions
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92
src/sys/create.c
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@ -486,8 +486,8 @@ NTSTATUS FspFsvolCreateComplete(
FSP_FILE_DESC *FileDesc = FspIopRequestContext(Request, RequestFileDesc);
FSP_FILE_NODE *FileNode = FileDesc->FileNode;
FSP_FILE_NODE *OpenedFileNode;
UNICODE_STRING ReparseFileName;
PREPARSE_DATA_BUFFER ReparseData;
UNICODE_STRING ReparseTargetPrefix, ReparseTargetPath;
if (FspFsctlTransactCreateKind == Request->Kind)
{
@ -505,32 +505,74 @@ NTSTATUS FspFsvolCreateComplete(
if (IO_REMOUNT == Response->IoStatus.Information)
{
Irp->IoStatus.Information = IO_REMOUNT;
Result = STATUS_REPARSE;
FSP_RETURN();
FSP_RETURN(Result = STATUS_REPARSE);
}
else if (IO_REPARSE == Response->IoStatus.Information)
else
if (IO_REPARSE == Response->IoStatus.Information ||
IO_REPARSE_TAG_SYMLINK == Response->IoStatus.Information)
{
ReparseFileName.Buffer =
(PVOID)(Response->Buffer + Response->Rsp.Create.Reparse.FileName.Offset);
ReparseFileName.Length = ReparseFileName.MaximumLength =
Response->Rsp.Create.Reparse.FileName.Size;
/*
* IO_REPARSE means that the user-mode file system has returned a device-relative
* path. Prefix it with our device name and send it to the IO Manager.
*
* IO_REPARSE_TAG_SYMLINK means that the user-mode file system has returned a full
* symbolic link reparse buffer. In this case send the target path to the IO Manager
* without prefixing it with our device name as it is expected to be absolute in the
* NT namespace.
*/
if ((PUINT8)ReparseFileName.Buffer + ReparseFileName.Length >
(PUINT8)Response + Response->Size ||
0 == ReparseFileName.Length)
FSP_RETURN(Result = STATUS_REPARSE_POINT_NOT_RESOLVED);
if (ReparseFileName.Length > FileObject->FileName.MaximumLength)
if (IO_REPARSE == Response->IoStatus.Information)
{
PVOID Buffer = FspAllocExternal(ReparseFileName.Length);
RtlCopyMemory(&ReparseTargetPrefix, &FsvolDeviceExtension->VolumeName,
sizeof ReparseTargetPrefix);
ReparseTargetPath.Length = ReparseTargetPath.MaximumLength =
Response->Rsp.Create.Reparse.FileName.Size;
ReparseTargetPath.Buffer =
(PVOID)(Response->Buffer + Response->Rsp.Create.Reparse.FileName.Offset);
if ((PUINT8)ReparseTargetPath.Buffer + ReparseTargetPath.Length >
(PUINT8)Response + Response->Size || 0 == ReparseTargetPath.Length)
FSP_RETURN(Result = STATUS_REPARSE_POINT_NOT_RESOLVED);
}
else
{
ASSERT(IO_REPARSE_TAG_SYMLINK == Response->IoStatus.Information);
ReparseData = (PVOID)(Response->Buffer + Response->Rsp.Create.Reparse.Data.Offset);
if ((PUINT8)ReparseData + Response->Rsp.Create.Reparse.Data.Size >
(PUINT8)Response + Response->Size)
FSP_RETURN(Result = STATUS_IO_REPARSE_DATA_INVALID);
Result = FsRtlValidateReparsePointBuffer(Response->Rsp.Create.Reparse.Data.Size,
ReparseData);
if (!NT_SUCCESS(Result))
FSP_RETURN();
RtlZeroMemory(&ReparseTargetPrefix, sizeof ReparseTargetPrefix);
ReparseTargetPath.Buffer = ReparseData->SymbolicLinkReparseBuffer.PathBuffer +
ReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(WCHAR);
ReparseTargetPath.Length = ReparseTargetPath.MaximumLength =
ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
}
if (ReparseTargetPrefix.Length + ReparseTargetPath.Length >
FileObject->FileName.MaximumLength)
{
PVOID Buffer = FspAllocExternal(
ReparseTargetPrefix.Length + ReparseTargetPath.Length);
if (0 == Buffer)
FSP_RETURN(Result = STATUS_INSUFFICIENT_RESOURCES);
FspFreeExternal(FileObject->FileName.Buffer);
FileObject->FileName.MaximumLength = ReparseFileName.Length;
FileObject->FileName.MaximumLength =
ReparseTargetPrefix.Length + ReparseTargetPath.Length;
FileObject->FileName.Buffer = Buffer;
}
FileObject->FileName.Length = 0;
RtlCopyUnicodeString(&FileObject->FileName, &ReparseFileName);
RtlAppendUnicodeStringToString(&FileObject->FileName, &ReparseTargetPrefix);
RtlAppendUnicodeStringToString(&FileObject->FileName, &ReparseTargetPath);
/*
* The RelatedFileObject does not need to be changed according to:
@ -548,8 +590,7 @@ NTSTATUS FspFsvolCreateComplete(
*/
Irp->IoStatus.Information = IO_REPARSE;
Result = STATUS_REPARSE;
FSP_RETURN();
FSP_RETURN(Result = STATUS_REPARSE);
}
else
{
@ -557,10 +598,7 @@ NTSTATUS FspFsvolCreateComplete(
if ((PUINT8)ReparseData + Response->Rsp.Create.Reparse.Data.Size >
(PUINT8)Response + Response->Size)
{
Result = STATUS_IO_REPARSE_DATA_INVALID;
FSP_RETURN();
}
FSP_RETURN(Result = STATUS_IO_REPARSE_DATA_INVALID);
Result = FsRtlValidateReparsePointBuffer(Response->Rsp.Create.Reparse.Data.Size,
ReparseData);
@ -571,17 +609,13 @@ NTSTATUS FspFsvolCreateComplete(
Irp->Tail.Overlay.AuxiliaryBuffer = FspAllocNonPagedExternal(
Response->Rsp.Create.Reparse.Data.Size);
if (0 == Irp->Tail.Overlay.AuxiliaryBuffer)
{
Result = STATUS_INSUFFICIENT_RESOURCES;
FSP_RETURN();
}
FSP_RETURN(Result = STATUS_INSUFFICIENT_RESOURCES);
RtlCopyMemory(Irp->Tail.Overlay.AuxiliaryBuffer, ReparseData,
Response->Rsp.Create.Reparse.Data.Size);
Irp->IoStatus.Information = ReparseData->ReparseTag;
Result = STATUS_REPARSE;
FSP_RETURN();
FSP_RETURN(Result = STATUS_REPARSE);
}
}