[PATCH] winsup/cygwin: Protect fork() against dll- and exe-updates.

Corinna Vinschen corinna-cygwin@cygwin.com
Fri Aug 7 16:18:00 GMT 2015

On Aug  7 11:01, cyg Simple wrote:
> On 8/3/2015 4:21 PM, Corinna Vinschen wrote:
> > 
> > The HMODULE is only the address of the section so, no, there's no way to
> > do an NtCreateFile with this information alone.  As for the file id, I
> > never tried NtOpenFile w/ FILE_OPEN_BY_FILE_ID.  The usage description
> > in the WDK docs is a bit vague, but it does work.  You just have to have
> > the file id from some earlier call to NtQueryInformationFile.
> > 
> I seem to remember that the file id isn't guaranteed to be constant on
> Windows FS, especially FAT, unless you keep the file open.

FAT doesn't support opening files by file ID.  On NTFS, file IDs are
constant and unique per file as long as it exists.  Se the remarks
secion in



Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat
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