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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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73
src/dll/fsop.c
View File

@ -1060,21 +1060,21 @@ FSP_API NTSTATUS FspFileSystemResolveReparsePoints(FSP_FILE_SYSTEM *FileSystem,
PIO_STATUS_BLOCK PIoStatus, PVOID Buffer, PSIZE_T PSize)
{
WCHAR c, *p, *lastp;
PWSTR TargetPath, TargetPathEnd, TargetLink;
PWSTR TargetPath, TargetPathEnd, ReparseTargetPath;
union
{
REPARSE_DATA_BUFFER V;
UINT8 B[FSP_FSCTL_TRANSACT_RSP_BUFFER_SIZEMAX];
} ReparseDataBuf;
PREPARSE_DATA_BUFFER ReparseData = &ReparseDataBuf.V;
SIZE_T Size, MaxTries = 32;
SIZE_T Size, ReparseTargetPathLength, MaxTries = 32;
NTSTATUS Result;
TargetPath = Buffer;
TargetPathEnd = TargetPath + *PSize / sizeof(WCHAR);
Size = (lstrlenW(FileName) + 1) * sizeof(WCHAR);
if (Size > *PSize)
return STATUS_OBJECT_NAME_INVALID;
return STATUS_REPARSE_POINT_NOT_RESOLVED;
memcpy(TargetPath, FileName, Size);
p = TargetPath + ReparsePointIndex;
@ -1143,59 +1143,44 @@ FSP_API NTSTATUS FspFileSystemResolveReparsePoints(FSP_FILE_SYSTEM *FileSystem,
/* found a 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! */
goto reparse_data_exit;
if (0 == --MaxTries)
return STATUS_REPARSE_POINT_NOT_RESOLVED;
if (IO_REPARSE_TAG_SYMLINK == ReparseData->ReparseTag)
{
TargetLink = ReparseData->SymbolicLinkReparseBuffer.PathBuffer +
ReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(WCHAR);
Size = ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
}
else
{
/* not a symlink; return the full reparse point! */
if (Size > *PSize)
return STATUS_IO_REPARSE_DATA_INVALID;
memcpy(Buffer, ReparseData, Size);
goto no_symlink_exit;
}
if (Size > 4 * sizeof(WCHAR) &&
'\\' == TargetLink[0] &&
'?' == TargetLink[1] &&
'?' == TargetLink[2] &&
'\\' == TargetLink[3])
{
/* absolute symlink; replace whole path */
if (Size > *PSize)
return STATUS_OBJECT_NAME_INVALID;
memcpy(TargetPath, TargetLink, Size);
p = TargetPath + Size / sizeof(WCHAR);
/* absolute symlinks on Windows are in NT namespace; send to FSD for further processing */
goto exit;
}
else
{
/* relative symlink; replace last path component seen */
if (Size + sizeof(WCHAR) > (TargetPathEnd - lastp) * sizeof(WCHAR))
return STATUS_OBJECT_NAME_INVALID;
memcpy(lastp, TargetLink, Size);
lastp[Size / sizeof(WCHAR)] = L'\0';
p = lastp;
}
/* relative symlink; replace last path component seen */
if (ReparseTargetPathLength + sizeof(WCHAR) > (TargetPathEnd - lastp) * sizeof(WCHAR))
return STATUS_REPARSE_POINT_NOT_RESOLVED;
memcpy(lastp, ReparseTargetPath, ReparseTargetPathLength);
lastp[ReparseTargetPathLength / sizeof(WCHAR)] = L'\0';
p = lastp;
}
exit:
*PSize = (PUINT8)p - (PUINT8)TargetPath;
PIoStatus->Status = STATUS_REPARSE;
PIoStatus->Information = 0/*IO_REPARSE*/;
return STATUS_REPARSE;
no_symlink_exit:
reparse_data_exit:
if (Size > *PSize)
return IO_REPARSE_TAG_SYMLINK != ReparseData->ReparseTag ?
STATUS_IO_REPARSE_DATA_INVALID : STATUS_REPARSE_POINT_NOT_RESOLVED;
*PSize = Size;
memcpy(Buffer, ReparseData, Size);
PIoStatus->Status = STATUS_REPARSE;
PIoStatus->Information = ReparseData->ReparseTag;
return STATUS_REPARSE;

19
src/dll/fuse/fuse_intf.c
View File

@ -2005,27 +2005,20 @@ static NTSTATUS fsp_fuse_intf_SetReparsePoint(FSP_FILE_SYSTEM *FileSystem,
ReparseTargetPathLength = ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
/* is this an absolute path? */
if (ReparseTargetPathLength > 4 * sizeof(WCHAR) &&
'\\' == ReparseTargetPath[0] &&
'?' == ReparseTargetPath[1] &&
'?' == ReparseTargetPath[2] &&
'\\' == ReparseTargetPath[3])
if (ReparseTargetPathLength >= sizeof(WCHAR) && L'\\' == ReparseTargetPath[0])
{
/* we do not support absolute paths that point outside this file system */
if (!Request->Req.FileSystemControl.TargetOnFileSystem)
if (0 == Request->Req.FileSystemControl.TargetOnFileSystem)
return STATUS_ACCESS_DENIED;
}
/* the first path component is assumed to be the device name; skip it! */
ReparseTargetPath += 4;
ReparseTargetPathLength -= 4 * sizeof(WCHAR);
while (0 < ReparseTargetPathLength && L'\\' != *ReparseTargetPath)
ReparseTargetPathLength--, ReparseTargetPath++;
ReparseTargetPath += Request->Req.FileSystemControl.TargetOnFileSystem / sizeof(WCHAR);
ReparseTargetPathLength -= Request->Req.FileSystemControl.TargetOnFileSystem;
}
}
else
{
ReparseTargetPath = (PVOID)(ReparseData->GenericReparseBuffer.DataBuffer + 8);
ReparseTargetPathLength = ReparseData->ReparseDataLength - sizeof(UINT64);
ReparseTargetPathLength = ReparseData->ReparseDataLength - 8;
}
memcpy(TargetPath, ReparseTargetPath, ReparseTargetPathLength);