Date: 2017-05-01 11:08 pm (UTC)
From: (Anonymous)
>Not in any novel way. An attacker could disable Secure Boot and install a backdoored bootloader, just as they could with physical access.

I don't think this is actually possible with physical access — a properly configured system will at least require a supervisor password to disable Secure Boot.

>modify your initramfs (because that's not signed even if you're using UEFI Secure Boot)

This is not true if you've rolled your own Platform Keys and sign&boot plain kernel images (with initramfs bundled into them).
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Matthew Garrett

About Matthew

Power management, mobile and firmware developer on Linux. Security developer at Google. Ex-biologist. @mjg59 on Twitter. Content here should not be interpreted as the opinion of my employer.

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