This has been fixed in the Fall Creators Update (1709 aka RS3): DefSetText now fixes up misaligned strings without bugchecking, effectively restoring the behaviour prior to introduction of internal structure integrity checks in the Anniversary Update (1607 aka RS1).
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Whoa, that's awesome, thanks Genghis!
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As in, explicit call to KeBugCheck on error condition?
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Yep! Crazy right?
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https://blogs.technet.microsoft.com/mmpc/2017/01/13/hardening-windows-10-with-zero-day-exploit-mitigations/ … suggests that they're intentionally bug checking on invalid data to that function because it was an exploit channel. Which _kinda_ makes sense but is still somewhat surprising.
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Adobe did the same with their quick (temporary) patch for CVE-2017-11292, before they had the chance to do proper input validation. That quick patch then broke VMware's SWFs. Not invonceivable that this DefSetText behavior could break stuff too.
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Travis wait, did you just call Windows 10 a person!?

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