Event And Packet Separation
There are two patterns I see pretty often:
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Фото: Глеб Щелкунов / Коммерсантъ
What is striking about this implementation is that it does not involve CR0.WP. The implementation elegantly sidesteps this by exploiting the fact that it is under no obligation to access memory via the pointer it receives from userspace. Since the kernel is in complete control of virtual memory, it can simply remap the physical frame into its own virtual address space, with arbitrary permissions, and operate on it as it wishes.
Some of the largest US banks are considering suing their financial regulator, arguing that a new raft of licenses for crypto, payment and fintech could put American consumers and the wider financial system at risk.