[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

--- Comment #2 from Andrew Wesie <awesie at gmail.com> ---
Confirmed the issue. It is a known limitation that is annoying to handle
correctly in Wine.

When a DLL is mapped in to memory, its data section should be mapped as
PAGE_WRITECOPY and this memory should be reported as "Shared" by
QueryWorkingSetEx. Once a page is modified, that page should become mapped as
PAGE_READWRITE and reported as not shared.

Wine does not handle this correctly. Wine maps PROT_WRITECOPY as a private
mapping (instead of a shared mapping) and does not update the mapping
protection to PROT_READWRITE.

Provided we do not want to modify the Linux kernel, the correct way to handle
this is probably to map the memory read only, then handle the fault by mapping
it as PAGE_READWRITE. Unfortunately, this may harm start-up performance due to
the extra page faults.

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