[Bug 48407] OllyDbg 2.x segfaults the process after attaching to it

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48407

--- Comment #1 from Jacek Caban <jacek at codeweavers.com> ---
Created attachment 66185
  --> https://bugs.winehq.org/attachment.cgi?id=66185
hack

The problem is that OllyDbg tries to set PAGE_GUARD protection on whole ntdll
code. This can't work with current design because we need to be able to execute
signals to handle it and signal handlers themselves are protected. The
unrecoverable page fault happens in this case on return from mprotect to ntdll.

The attached hack works around the problem. I didn't look why it worked before
(my guess is that the problematic protection change is part of the initial
breakpoint exception and before the patch, simulated breakpoint was not
considered as this "special iniial" one; that would match the difference the
patch made for VS). The path forward is to move ntdll to PE lib + native lib
hybrid. I imagine that page guard related signal handling will not reach PE
part in this case.

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