[Bug 47198] League of Legends 9.10+ crashes after champion select (anticheat, access of 64-bit TEB from WoW64 via %gs register)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=47198

--- Comment #114 from David Torok <dt at zeroitlab.com> ---
(In reply to Zebediah Figura from comment #113)
> (In reply to neyl from comment #112)
> > With Wine 7.1 released we now have a lot of PE modules and WoW64 thunks.
> > What is missing to get this bug properly fixed?
> 
> Without changing the %cs segment, we still need:
> 
> * the ability to change %gs in the wine syscall thunk, which we can only
> safely do once all modules have been converted to PE. I'm going to go ahead
> and repurpose/narrow this bug report for this specific issue;
> 
> * the ability to execute 64-bit syscalls in a 32-bit process, which we can
> only safely do once all modules have WoW64 thunks written and the last parts
> of WoW64 support are in place. I've split this off into bug 52483;
> 
> * the ability to catch direct x86_64 SYSCALL instructions (bug 48291).

Well, this was a while back but as I remember I don't believe syscalls were
executed after the far jump that changes %cs. Between the 2 far jump %cs
changes only the 64 bit TEB->PEB access happened. So as far as I understand,
there is no need to be able to "directly execute" 64 bit syscalls from a 32 bit
process. The normal "syscall path" for this application follows wine's own
syscall thunks. (Therefore also eliminating the need to solve bug 48291)

The only one left I think is changing %gs.

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