UPX and VSE

	Henrik Høyer
	Chief Software Architect
	[hidden email] • (+45) 4029 2092
	Tigervej 27 • 4600 Køge
	www.sPeople.dk • (+45) 7023 7775

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Todor is right. Look at the class VirtualMachineConfiguration. The class method #imageFileOffset points to
the location of the Vm configuration structure. The devs at Digitalk did lookup the location of the C structure
in the EXE file and the VM-DLL also reads this information using a similar way as the class VirtualMachineConfiguration does.
The UPX encoder replaces the orginal EXE stub with it's own code, so the layout of the EXE is now completely
different and the VM will read an invalid VM configuration.
 
Our VM does no longer use the VM config structure in the V.EXE, so the UPX image does start, but only a
text window appears (the standard default runtime app). The reason for this is that the VM tries to read a
binary section named ".vimage". The UPX packer puts all sections from the original EXE into a new section
named "UPX1". The VM does no longer find the ".vimage" section, so an "empty" image is being started.
 
To make compressed images work, the VM must be able to decode the compressed UPX1 section.
 
Kind regards,
 
Andreas
 
Andreas Rosenberg | eMail: [hidden email]
APIS GmbH         | Phone: +49 9482 9415-0
Im Haslet 42      | Fax: +49 9482 9415-55
93086 Wörth/D     | WWW: < http://www.apis.de/ <http://www.apis.de/> >
Germany           | < http://www.fmea.de/ <http://www.fmea.de/> >

   

-----Original Message-----
From: Using Visual Smalltalk for Windows/Enterprise [mailto:[hidden email]]On Behalf Of Todor Todorov
Sent: Donnerstag, 12. April 2012 02:26
To: [hidden email]
Subject: Re: UPX and VSE



If I remember correctly, the VM finds start-up info like configuration parameters and the saved memory space / image (!!!) inside
the EXE file. I am not 100% sure how it access it, but I think it reads the binary data directly from the EXE file. I don't think
it's possible to do what you want with the current implementation.





From: Using Visual Smalltalk for Windows/Enterprise [mailto:[hidden email]] On Behalf Of Henrik Høyer
Sent: 10. april 2012 08:20
To: [hidden email]
Subject: UPX and VSE



Has anybody had any luck using UPX ( http://upx.sourceforge.net/ <http://upx.sourceforge.net/> ) or any other binary packagers to
compress the .exe file produces by VSE?



I am getting a "compiler unable to allocate memory" error from the VM. I am guessing that the VM is reading some configuration
values from the (now compressed) exe file.










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Henrik Høyer


Chief Software Architect


 <mailto:[e-mail]> [hidden email] * (+45) 4029 2092


Tigervej 27 * 4600 Køge


 <http://www.sPeople.dk> www.sPeople.dk * (+45) 7023 7775



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