[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 #25 from Richard Yao <ryao at gentoo.org> ---
> The problem is that there is no way to properly implement this on Linux
> since there is no way to simply map the memory of a different process if you
> are not inside the kernel. Since wine is no kernel module it can only use
> memory of different processes, when they explicitly create it as shared
> memory block. Sadly you can not declare a memory block as shared after it
> was allocated, so this does not help implementing this command.

It occurred to me that there is a simpler way of doing this on Linux. You just
open /proc/$PID/mem, do lseek to the region that you want (after doing page
alignment) and then call mmap (also after doing page alignment). The downside
is that this requires root privileges, but on the bright side, you don't need
to write a kernel module.

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