This was a pain to track down, Microsoft forgot to check the return code from win32k!GetWOWClass. Sigh.
pic.twitter.com/DSjnRYdgQJ
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Fits in a tweet though! main(){PVOID N[]={0,0};CreateDesktop(0,0,0,0,0,0);GetProcAddress(LoadLibrary("WIN32U"), "NtUserGetWOWClass")(0, N);}
Null pointer dereference, which MS used to care about but hasn't since they disabled NTVDM.
Useful for me to know, I do a fair bit of testing against shared environments where this kind of thing is a problem for the client.
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