Re: [PATCH 0/4] MR6866: Draft: ntdll: On macOS x86_64, swap GSBASE between the TEB and macOS TSD when entering/leaving PE code.

[Jinoh Kang (＠iamahuman)]

On Fri Nov 22 15:22:32 2024 +0000, Jinoh Kang wrote:
> > That's handled by making the stack pointer point inside the frame,
>
> which causes `is_inside_syscall` to return FALSE.
> Making SP point inside the frame *before* calling `_thread_set_tsd_base`
> still leads to a time window where `is_inside_syscall()` is FALSE but
> GSBASE is still pointing to TSD.

I'd say, don't use `is_inside_signal_stack()` at all but instead stick to `gs30` for entry/exit of all signal handlers.