[PULL] use LRMI for real-mode calls
Mark Kettenis
mark.kettenis at xs4all.nl
Fri Apr 30 14:47:31 PDT 2010
> From: Adam Jackson <ajax at nwnk.net>
> Date: Fri, 30 Apr 2010 17:37:32 -0400
>
> - backend-x86emu.c looks like it loses the feature of mapping the 1M
> arena wherever the kernel pleases, and instead reverts to mapping it at
> the 0 page. This is a security bug on arches where kernel virtual
> addresses equal user virtual addresses (which includes x86 and amd64).
And for this reason, The OpenBSD kernel will actually refuse to map a
page at virtual address zero. And I believe the same is true on Linux
if you;re using a security conscious distro.
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