Do not hook NtSetContextThread if PreviousMode == KernelMode #32
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…kernel mode *Zw*Get/SetContextThread behaves very differently from *Nt*Get/SetContextThread; e.g. calling ZwSetContextThread will modify a thread's kernel trap frame rather than the user mode CONTEXT structure that the Nt syscall expects. Modifying the KTRAP_FRAME is a good way to kill a thread and probably the rest of the OS with it
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See #29. (3)