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sys,dll: symbolic link testing

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This commit is contained in:
Bill Zissimopoulos
2016-09-11 17:04:01 -07:00
parent 997476f015
commit bd0acf2289
4 changed files with 98 additions and 71 deletions
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38
src/sys/create.c
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@ -485,7 +485,7 @@ NTSTATUS FspFsvolCreateComplete(
FSP_FILE_NODE *FileNode = FileDesc->FileNode;
FSP_FILE_NODE *OpenedFileNode;
PREPARSE_DATA_BUFFER ReparseData;
UNICODE_STRING ReparseTargetPrefix, ReparseTargetPath;
UNICODE_STRING ReparseTargetPrefix0, ReparseTargetPrefix1, ReparseTargetPath;
if (FspFsctlTransactCreateKind == Request->Kind)
{
@ -514,14 +514,15 @@ NTSTATUS FspFsvolCreateComplete(
* 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,
* and prefix it with our device name depending on SYMLINK_FLAG_RELATIVE.
* symbolic link reparse buffer. In this case send the target path to the IO Manager.
*/
if (IO_REPARSE == Response->IoStatus.Information)
{
RtlCopyMemory(&ReparseTargetPrefix, &FsvolDeviceExtension->VolumeName,
sizeof ReparseTargetPrefix);
RtlCopyMemory(&ReparseTargetPrefix0, &FsvolDeviceExtension->VolumeName,
sizeof ReparseTargetPrefix0);
RtlCopyMemory(&ReparseTargetPrefix1, &FsvolDeviceExtension->VolumePrefix,
sizeof ReparseTargetPrefix1);
ReparseTargetPath.Length = ReparseTargetPath.MaximumLength =
Response->Rsp.Create.Reparse.FileName.Size;
@ -529,7 +530,9 @@ NTSTATUS FspFsvolCreateComplete(
(PVOID)(Response->Buffer + Response->Rsp.Create.Reparse.FileName.Offset);
if ((PUINT8)ReparseTargetPath.Buffer + ReparseTargetPath.Length >
(PUINT8)Response + Response->Size || 0 == ReparseTargetPath.Length)
(PUINT8)Response + Response->Size ||
sizeof(WCHAR) > ReparseTargetPath.Length ||
L'\\' != ReparseTargetPath.Buffer[0])
FSP_RETURN(Result = STATUS_REPARSE_POINT_NOT_RESOLVED);
}
else
@ -540,18 +543,18 @@ NTSTATUS FspFsvolCreateComplete(
if ((PUINT8)ReparseData + Response->Rsp.Create.Reparse.Data.Size >
(PUINT8)Response + Response->Size)
FSP_RETURN(Result = STATUS_IO_REPARSE_DATA_INVALID);
FSP_RETURN(Result = STATUS_REPARSE_POINT_NOT_RESOLVED);
Result = FsRtlValidateReparsePointBuffer(Response->Rsp.Create.Reparse.Data.Size,
ReparseData);
if (!NT_SUCCESS(Result))
FSP_RETURN();
FSP_RETURN(Result = STATUS_REPARSE_POINT_NOT_RESOLVED);
if (0 == (ReparseData->SymbolicLinkReparseBuffer.Flags & SYMLINK_FLAG_RELATIVE))
RtlZeroMemory(&ReparseTargetPrefix, sizeof ReparseTargetPrefix);
else
RtlCopyMemory(&ReparseTargetPrefix, &FsvolDeviceExtension->VolumeName,
sizeof ReparseTargetPrefix);
if (FlagOn(ReparseData->SymbolicLinkReparseBuffer.Flags, SYMLINK_FLAG_RELATIVE))
FSP_RETURN(Result = STATUS_REPARSE_POINT_NOT_RESOLVED);
RtlZeroMemory(&ReparseTargetPrefix0, sizeof ReparseTargetPrefix0);
RtlZeroMemory(&ReparseTargetPrefix1, sizeof ReparseTargetPrefix1);
ReparseTargetPath.Buffer = ReparseData->SymbolicLinkReparseBuffer.PathBuffer +
ReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(WCHAR);
@ -559,20 +562,21 @@ NTSTATUS FspFsvolCreateComplete(
ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
}
if (ReparseTargetPrefix.Length + ReparseTargetPath.Length >
if (ReparseTargetPrefix0.Length + ReparseTargetPrefix1.Length + ReparseTargetPath.Length >
FileObject->FileName.MaximumLength)
{
PVOID Buffer = FspAllocExternal(
ReparseTargetPrefix.Length + ReparseTargetPath.Length);
ReparseTargetPrefix0.Length + ReparseTargetPrefix1.Length + ReparseTargetPath.Length);
if (0 == Buffer)
FSP_RETURN(Result = STATUS_INSUFFICIENT_RESOURCES);
FspFreeExternal(FileObject->FileName.Buffer);
FileObject->FileName.MaximumLength =
ReparseTargetPrefix.Length + ReparseTargetPath.Length;
ReparseTargetPrefix0.Length + ReparseTargetPrefix1.Length + ReparseTargetPath.Length;
FileObject->FileName.Buffer = Buffer;
}
FileObject->FileName.Length = 0;
RtlAppendUnicodeStringToString(&FileObject->FileName, &ReparseTargetPrefix);
RtlAppendUnicodeStringToString(&FileObject->FileName, &ReparseTargetPrefix0);
RtlAppendUnicodeStringToString(&FileObject->FileName, &ReparseTargetPrefix1);
RtlAppendUnicodeStringToString(&FileObject->FileName, &ReparseTargetPath);
/*