Re: Windows10 Creators Update

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

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On Jul 17 10:09, Corinna Vinschen wrote:
> On Jul 16 11:10, Achim Gratz wrote:
> > Achim Gratz writes:
> > > I've finally got that update installed on my Windows10 box and sure
> > > enough I immediately got fork problems (on 32bit only).  Since this
> > > update the WoW64 DLLs get mapped below 0x70000000:
> > 
> > …and on each reboot these end up somewhere else, sometimes even above
> > 0x7000000 as intended.
> 
> It seems the Windows team raised the size of the ASLR pool on 32 bit, at
> least on wow64.
> 
> > > In all likelyhood that means we can't really support 32bit on Windows 10
> > > anymore unless there's a way to stabilize the addresses used by these
> > > DLL and then teaching rebaselst to rebase from a lower starting point.
> > 
> > Or we will have to ask our users to reboot more often.  :-(
> 
> Sounds like a plan.
> 
> On Wow64 we have the upper 2 Gigs address space for us, but I vaguely
> recall that there was a problem moving the DLLs into this area.  That's
> why we only have heap and mmap there these days.  Maybe we should
> reconsider...
> 
> But, then again, what's the lowest address for the wow64 DLLs you
> observed?  And what about native 32 bit (no wow64 DLLs)?

On native 32 bit:

6B1E0000-6B1E1000 r--p 00000000 5A70:6C49 2814749767187753    /cygdrive/c/Windows/System32/winrnr.dll

> We can't stabilize the address for the Windows DLLs, but we
> can obviously adapt to it by changing rebase.


Corinna

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

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