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

From: Matthew Garrett
Date: Fri Feb 08 2013 - 14:18:43 EST

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.
¢éì®&Þ~º&¶¬–+-±éÝ¥Šw®žË±Êâmébžìdz¹Þ)í…æèw*jg¬±¨¶‰šŽŠÝj/êäz¹ÞŠà2ŠÞ¨è­Ú&¢)ß«a¶Úþø®G«éh®æj:+v‰¨Šwè†Ù>Wš±êÞiÛaxPjØm¶Ÿÿà -»+ƒùdš_