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RE: Bug: C-prog from Win dies in fork; gdb.exe also won't run
Corinna Vinschen wrote on 12 March 2008 16:23:
> On Mar 12 16:13, Dave Korn wrote:
> > Brian Dessent wrote on 12 March 2008 15:59:
> > > Dave Korn wrote:
> > > > Now, who supposes you could work around the restriction by writing
> > > >
> > > > * (WORD *) 0x004000dc = POSIX_CUI;
> > > >
> > > > just before calling NtSetInformation?
> > >
> > > How are you going to fool the executive by poking around in the PE
> > > header from userspace long after the process has initialized? The
> > > executive fundamentally knows which subsystem any given process is
> > > running in because it created it and manages the low level process
> > > table.
> > This is not just any code - this is MS code.
> > Given that, it's therefore going to have been done as quickly and
> > cheaply as possible, so why should we assume they wouldn't they just
> > check the value in the PE header at the start of
> > NtSetInformationProcess?
> Is that just an assumption or do you know that this would work?
It's neither. It's a question, which I raise on the basis of an educated
guess about what is possible. I don't have Vista or I'd already have
reversed the ker^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H^H written a test program to
see if it works or not.
Can't think of a witty .sigline today....
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