I don't think all lockdown features should be enabled on UEFI secure booted systems. On laptops, one can, for example, have OPAL self encrypting drives that are unlocked transparently before the OS (or the bootloader for that matter) have any chance of knowing about it. In this case, the blocking of hibernation is not needed since the resume partition is encrypted. Also in the case of laptops, some power management functionality is needed that can only be accessed through MSR and other unorthodox methods. This makes it so that laptop owners have two choices: either disable secure boot and have a full-featured laptop or enable secure boot and have a crippled laptop. I think a third choice would be a generous offer to laptop users to be able to have the most secure system possible while retaining important laptop functionality.
Power management, mobile and firmware developer on Linux. Security developer at Aurora. Ex-biologist. mjg59 on Twitter. Content here should not be interpreted as the opinion of my employer. Also on Mastodon.
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Re lockdown mode
Date: 2018-11-21 08:52 am (UTC)Also in the case of laptops, some power management functionality is needed that can only be accessed through MSR and other unorthodox methods. This makes it so that laptop owners have two choices: either disable secure boot and have a full-featured laptop or enable secure boot and have a crippled laptop. I think a third choice would be a generous offer to laptop users to be able to have the most secure system possible while retaining important laptop functionality.