[coreboot - Bug #440] superiotool tells you to run it as root and stops even when ran as root

[Nicholas Chin]

Issue #440 has been updated by Nicholas Chin.

I found this comment on this GitHub issue, which might explain the strange behaviour we are seeing: https://github.com/zamaudio/intelmetool/issues/20#issuecomment-751562837
> I got this error too, and tracked the issue down.
>
> iopl() returns an error EPERM (Operation not permitted) - even when invoked as root - if the kernel is in "lockdown mode". One of the things that lockdown mode does is disables userspace access to privileged I/O.
>
> You can check if you are in lockdown mode as follows:
>
> $ cat /sys/kernel/security/lockdown

none [integrity] confidentiality
> Modern Linux distributions - such as Debian, in my case - will automatically enter lockdown mode (integrity) when the kernel is booted with EFI Secure Boot enabled. To fix the issue I simply disabled Secure Boot and restarted my machine.

Could you check if your system is in lockdown mode and if you have secure boot enabled?

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Bug #440: superiotool tells you to run it as root and stops even when ran as root
https://ticket.coreboot.org/issues/440#change-1484

* Author: J Nky
* Status: Response Needed
* Priority: Normal
* Target version: none
* Start date: 2022-11-24
* Affected versions: 4.15
* Affected OS: ubuntu 22.10
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On ubuntu 22.10:

**sudo superiotool**
iopl: Function not implemented
Superiotool must be run as root.

superiotool tells you to run it as root and stops even when ran as root