Recent User32 <=> windowClass assembly findings
bunglehead at gmail.com
Sun Dec 20 09:16:17 CST 2009
Hopefully my first attempt to implement class redirection wasn't committed
cause it's definitely incomplete.
After some testing I've got new info here (to be added to patch comments
1) not statically linked sxs module is loaded not only on window
on GetClassInfo() (GetClassInfoEx() is to be tested but I think it's
This is a case only on vista+ systems, xp doesn't attempt to load
2) "versioned" attribute in windowClass element affects redirection
when set to "no" user32 doesn't try to load assembly at all.
Second problem requires a FindActCtxSectionString() to actually fill key
with undocumented format, I did some dumping basing on length value
similar way it's done for dll redirection test (with a dword pointer)
fields are actually obvious - such as classname and module name.
First problem stops me cause I don't know what way to prefer here.
Any advices are welcome.
P.S. Maybe it helps - native returned class data in case of vista+ and
contains pointers to winproc as "FFFFxxxx" format, high word is
I don't know what is supposed to mean, builtin classes without
redirection don't show
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