[Patch] Fixing the PROCESS_DUP_HANDLE security hole.

[Pierre A. Humblet]

"Pierre A. Humblet" wrote:
>
> When running try_spawn with the snapshot, during the sleep period
> ps reports
> 
>       690     443     690        232    0 11054 10:32:21 <defunct>
>       464     690     690        464    0 11054 10:32:21 /c/WINNT/system32/notepad

FWIW, I was thinking about this during lunch.
The basic issue is that the pipe to the parent is not closed in the spawned
Windows process. One way out is to make the pipe non-inheritable and
duplicate it either in the parent (fork and spawn, except detach)
or in the child (exec). Now that subproc_ready is back, it doesn't matter
that an exec'ed Windows process does not duplicate the pipe.

Pierre