a crazy idea?

Date: 2017-12-19 09:52 pm (UTC)
From: (Anonymous)
I just had a crazy idea. What if grub did a signature validation (with say a PKI key) against the kernel and initramfs (either with the signature appended or specified as a separate file), and then, on validation, measured certificate into the PR instead of the file itself (on signature validation failure it grubs behaviour would only be defined as not measuring in the certificate)?
your security is still dependant on the hash being collision resistant (if I understand correctly), but what your measuring in becomes less variable.
(I just took a glance at the referenced Appendix A and it seems to be about the same idea)
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Matthew Garrett

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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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