[Bug 48665] Legends of Runeterra crashes at launch with wine-staging 5.2 (regression)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48665

Andrew Wesie <awesie at gmail.com> changed:

           What    |Removed                     |Added
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  Attachment #66571|0                           |1
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--- Comment #9 from Andrew Wesie <awesie at gmail.com> ---
Created attachment 67095
  --> https://bugs.winehq.org/attachment.cgi?id=67095
Alternative fix using soft dirty PTEs

After adding the previous patch to wine-staging, it became clear that it is
unlikely to be a path forward due to the limitations of using mmap+sigsegv to
implement WRITECOPY. In the future, it may be possible to use userfaultfd but
not currently.

This alternative patches tries to achieve the same effects that this bug
requires. It is not perfect, e.g. there are some unfixable race conditions and
performance overhead, but it shouldn't break anything unlike the previous
attempt.

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