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sys,dll: SYMLINK_FLAG_RELATIVE

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This commit is contained in:
Bill Zissimopoulos 2016-09-11 13:18:54 -07:00
parent af2cc10c15
commit f89c91cd10
4 changed files with 28 additions and 17 deletions
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28
src/dll/fsop.c
View File

@ -1141,29 +1141,35 @@ FSP_API NTSTATUS FspFileSystemResolveReparsePoints(FSP_FILE_SYSTEM *FileSystem,
return Result;
}
/* found a reparse point */
/*
* Found a reparse point!
*/
/* if not a symlink return the full reparse point */
if (IO_REPARSE_TAG_SYMLINK != ReparseData->ReparseTag)
/* not a symlink; return the full reparse point! */
goto reparse_data_exit;
ReparseTargetPath = ReparseData->SymbolicLinkReparseBuffer.PathBuffer +
ReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(WCHAR);
ReparseTargetPathLength = ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
if (ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0])
/* absolute symlink; return the full reparse point! */
/* if an absolute (in the NT namespace) symlink return the full reparse point */
if (0 == (ReparseData->SymbolicLinkReparseBuffer.Flags & SYMLINK_FLAG_RELATIVE) &&
ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0])
goto reparse_data_exit;
if (0 == --MaxTries)
return STATUS_REPARSE_POINT_NOT_RESOLVED;
/* relative symlink; replace last path component seen */
if (ReparseTargetPathLength + sizeof(WCHAR) > (TargetPathEnd - lastp) * sizeof(WCHAR))
/* if device relative symlink replace whole path; else replace last path component */
p = ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0] ?
TargetPath : lastp;
if (ReparseTargetPathLength + sizeof(WCHAR) > (TargetPathEnd - p) * sizeof(WCHAR))
return STATUS_REPARSE_POINT_NOT_RESOLVED;
memcpy(lastp, ReparseTargetPath, ReparseTargetPathLength);
lastp[ReparseTargetPathLength / sizeof(WCHAR)] = L'\0';
p = lastp;
memcpy(p, ReparseTargetPath, ReparseTargetPathLength);
p[ReparseTargetPathLength / sizeof(WCHAR)] = L'\0';
}
exit:
@ -1196,8 +1202,8 @@ FSP_API NTSTATUS FspFileSystemCanReplaceReparsePoint(
else if (*(PULONG)CurrentReparseData != *(PULONG)ReplaceReparseData)
return STATUS_IO_REPARSE_TAG_MISMATCH;
else if (!IsReparseTagMicrosoft(*(PULONG)CurrentReparseData) && (
REPARSE_GUID_DATA_BUFFER_HEADER_SIZE > CurrentReparseDataSize ||
REPARSE_GUID_DATA_BUFFER_HEADER_SIZE > ReplaceReparseDataSize ||
(SIZE_T)REPARSE_GUID_DATA_BUFFER_HEADER_SIZE > CurrentReparseDataSize ||
(SIZE_T)REPARSE_GUID_DATA_BUFFER_HEADER_SIZE > ReplaceReparseDataSize ||
*(PUINT32)&((PREPARSE_GUID_DATA_BUFFER)CurrentReparseData)->ReparseGuid.Data1 !=
*(PUINT32)&((PREPARSE_GUID_DATA_BUFFER)ReplaceReparseData)->ReparseGuid.Data1 ||
*(PUINT32)&((PREPARSE_GUID_DATA_BUFFER)CurrentReparseData)->ReparseGuid.Data2 !=

3
src/dll/fuse/fuse_intf.c
View File

@ -2005,7 +2005,8 @@ static NTSTATUS fsp_fuse_intf_SetReparsePoint(FSP_FILE_SYSTEM *FileSystem,
ReparseTargetPathLength = ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
/* is this an absolute path? */
if (ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0])
if (0 == (ReparseData->SymbolicLinkReparseBuffer.Flags & SYMLINK_FLAG_RELATIVE) &&
ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0])
{
/* we do not support absolute paths that point outside this file system */
if (0 == Request->Req.FileSystemControl.TargetOnFileSystem)

11
src/sys/create.c
View File

@ -516,9 +516,8 @@ 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
* without prefixing it with our device name as it is expected to be absolute in the
* NT namespace.
* 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.
*/
if (IO_REPARSE == Response->IoStatus.Information)
@ -550,7 +549,11 @@ NTSTATUS FspFsvolCreateComplete(
if (!NT_SUCCESS(Result))
FSP_RETURN();
RtlZeroMemory(&ReparseTargetPrefix, sizeof ReparseTargetPrefix);
if (0 == (ReparseData->SymbolicLinkReparseBuffer.Flags & SYMLINK_FLAG_RELATIVE))
RtlZeroMemory(&ReparseTargetPrefix, sizeof ReparseTargetPrefix);
else
RtlCopyMemory(&ReparseTargetPrefix, &FsvolDeviceExtension->VolumeName,
sizeof ReparseTargetPrefix);
ReparseTargetPath.Buffer = ReparseData->SymbolicLinkReparseBuffer.PathBuffer +
ReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(WCHAR);

3
src/sys/fsctl.c
View File

@ -145,7 +145,8 @@ static NTSTATUS FspFsvolFileSystemControlReparsePoint(
ReparseTargetPathLength = ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
/* is this an absolute path? determine if target resides on same device as link */
if (ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0])
if (0 == (ReparseData->SymbolicLinkReparseBuffer.Flags & SYMLINK_FLAG_RELATIVE) &&
ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0])
{
UNICODE_STRING TargetObjectName;
PDEVICE_OBJECT TargetDeviceObject;