Re: [PATCH] x86: Lock down MSR writing in secure boot

[Matthew Garrett]

On Fri, 2013-02-08 at 11:12 -0800, Kees Cook wrote:
> Writing to MSRs should not be allowed unless CAP_COMPROMISE_KERNEL is
> set since it could lead to execution of arbitrary code in kernel mode.

Willing to buy this, but do you have a description of one potential
approach? We should probably also figure out what's writing to MSRs at
the moment (anything other than energy_perf_bias?) and decide what the
best thing to do there is.
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