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Merge pull request #218 from cedws/MSRKernelNote

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Add note about MSR writes in kernel >=5.9
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Francesco Palmarini 2020-10-06 09:17:30 +02:00 committed by GitHub
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@ -39,6 +39,12 @@ Some time ago a feature called [Kernel Lockdown](https://lwn.net/Articles/706637
The LSM can be disabled this way: Check the contents of the file `/sys/kernel/security/lsm` (example contents: `capability,lockdown,yama`). Take the contents of the file, remove `lockdown` and add the rest as a kernel parameter, like this: `lsm=capability,yama`. Reboot and Kernel Lockdown will be disabled!
As of Linux 5.9, kernel messages will be logged whenever the script writes to MSR registers. These aren't a problem for now, but there's some indication that future kernels may restrict MSR writes from userspace by default. This is being tracked by issue #215. The messages will look something like:
```
[ 324.833543] msr: Write to unrecognized MSR 0x1a2 by python3
Please report to x86@kernel.org
```
Note that some kernels (e.g. [linux-hardened](https://www.archlinux.org/packages/extra/x86_64/linux-hardened/)) will prevent from writing to `/dev/mem` too. Specifically, you need a kernel with `CONFIG_DEVMEM` and `CONFIG_X86_MSR` set.
### Thermald