Christopher Faylor wrote: > > On Mon, May 31, 2004 at 06:46:11PM -0400, Pierre A. Humblet wrote: > >This patch prevents NtCreateFile from creating files with special > >names such as NUL. > >Because this needs to be checked very often, I tried to code it > >efficiently with a binary search (it can perhaps be reused elsewhere). > > > >The new function is_special_name() overlaps with special_name(), > >although there are small differences (it was designed from tests > >on XP Home Ed). Perhaps these two can be merged one day. > > Haven't we already done a "GetFileAttributes" on the path by the time > it reaches the NtCreateFile? If so, couldn't we just avoid trying to > create a file which has "bad" attributes?
Chris, Yes, we have done a "GetFileAttributes". I just checked the values. For AUX, CON, COMx, LPTx, NUL and PRN, the attribute is 0x20, FILE_ATTRIBUTE_ARCHIVE For conin$, conout$ and clock$ it is FFFFFFFF So we could filter on those values and only test for special names if necessary. Is that what you meant? Pierre
