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secure boot w/ Mender bzImage fails validation #dunfell
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Ballentine, Casey
Hello,
We have an Intel Elkhart Lake device that we are trying to get Secure Boot (via meta-secure-core/meta-efi-secure-boot SELoader) working on using the Dunfell release. This device uses Mender for updates via USB. We have Secure Boot working successfully on a similar device, but that device does not employ Mender. On the HDD image, /boot/bzImage and /boot/bzImage.p7b (the detached digital signature) are present, as are the set of GRUB artifacts in /boot/efi/BOOT/EFI. As a side note, we do not use an initramfs. Grub and grub.cfg validate on boot, but /boot/bzImage does not. I've read that SELoader can't access anything outside of the /efi partition. If that's correct, how do we work around this issue? Thanks for any help, and let me know if you need further information. Best, Casey |
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Leo
Hi Casey, I've recently had to activate secureboot on some uefi target. I was trying to use meta-secure-core/meta-efi-secure-boot aft first, but after digging a bit more into meta-intel, I've discovered that the implementation of meta-intel is cleaner and simpler than in meta-secure-core. If you are not interested about using microsoft certificates and the complicated shim + grub combo and that would plan to provision your own certificate in the firmware (which was what I wanted), I think meta-intel is a beter approach. Meta-intel leverate what they call "comboapp": https://git.yoctoproject.org/meta-intel/tree/classes/uefi-comboapp.bbclass It is a bundle of systemd-boot (a minimal uefi osloader implementation from systemd, previously gummiboot) with the kernel, cmdline and optionally a initramfs, furthermore it provide some clean and simple class to only sign an uefi binary: https://git.yoctoproject.org/meta-intel/tree/classes/uefi-sign.bbclass, if the uefi kernel stub is enough for your use case (which was my case) I do not know if you really need to keep grub, but if you can replace it with systemd boot and this uefi combo app from meta-intel layer (or more simply only use uefi kernel stub with a bundled initramfs), I think it could simplify a lot your boot process thus it will be simpler to implement an OTA solution with Mender. This is something that I will eventually try to achieve in the near future, so I will keep you posted about my progress if you are interested. Hope this will help you. Regards, -- Léo Le sam. 9 avr. 2022 à 16:38, Ballentine, Casey via lists.yoctoproject.org <casey.ballentine=essvote.com@...> a écrit : Hello, -- Léo |
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Ballentine, Casey
Unfortunately, the uefi-comboapp requires systemd-boot, which Mender doesn't currently support with mender-partuuid which our system requires for software updates over USB. Our devices aren't connected to the internet so OTA updates aren't an option for us. I've started a discussion on Mender.io to see if someone there can help us solve this issue, but in the meantime, any thoughts/suggestions are certainly appreciated!
-Casey |
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Leo
Hi Casey, Please have a look at https://git.yoctoproject.org/meta-intel/tree/classes/uefi-sign.bbclass, with this class you can sign a bzimage compiled with the kernel efi stub. Regards -- Léo Le jeu. 21 avr. 2022 à 16:13, Ballentine, Casey via lists.yoctoproject.org <casey.ballentine=essvote.com@...> a écrit : Unfortunately, the uefi-comboapp requires systemd-boot, which Mender doesn't currently support with mender-partuuid which our system requires for software updates over USB. Our devices aren't connected to the internet so OTA updates aren't an option for us. I've started a discussion on Mender.io to see if someone there can help us solve this issue, but in the meantime, any thoughts/suggestions are certainly appreciated! -- Léo |
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Jonas Andersson
Hi
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If OTA updates is not an option maybe RAUC can be an option for you? /Jonas Andersson 21 apr. 2022 kl. 17:54 skrev Leo <sartre.leo@...>:
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