[Bug 37355] Multiple software protection schemes need ntoskrnl ' MmMapLockedPagesSpecifyCache' implementation (Tages Protection v5.x, BattleEye's 'bedaisy.sys')

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=37355

--- Comment #31 from Zebediah Figura <z.figura12 at gmail.com> ---
(In reply to Richard Yao from comment #30)
> You also need to handle multiple adjacent allocations and do reference
> counting. You basically get to reimplement the kernel's memory management,
> which is plenty of effort to get right. The kernel does all of this for us,
> so why reimplement it? We'd never have an implementation that is both fast
> and correct either due to the need to stop all of the processes' threads to
> copy things in a way that would match what it would normally see. The fact
> that we need to copy at all would slow this down.

I don't think this is as difficult as you make it out to be. It's not like we
don't already do memory management anyway (see e.g. server/mapping.c).

It seems to me that we'd obviously want to avoid any need for root access (or
kernel patching) if possible.

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