Messages in this thread | | | Date | Tue, 14 Jul 2020 17:47:28 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH -v2.1] x86/msr: Filter MSR writes |
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On Tue, Jul 14, 2020 at 01:19:55PM +0100, Chris Down wrote: > That is, even with pr_err_ratelimited, we still end up logging on basically > every single write, even though it's from the same TGID writing to the same > MSRs, and end up becoming >80% of kmsg. > > Of course, one can boot with `allow_writes=1` to avoid these messages at
Yes, use that.
From a quick scan over that "tool" you pointed me at, it pokes at some MSRs from userspace which the kernel *also* writes to and this is exactly what should not be allowed.
As to the "MSR hack", please describe what the issue is exactly so that we can get the proper people involved. If anything, this needs to be fixed in the kernel properly. If people are waiting for a year for a BIOS fix, I'd say there's a very slim chance for that to ever happen...
Thx.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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