From: [personal profile] mjg59
If the system doesn't attempt to boot from USB then the system can't check whether there's a valid signature on the bootloader.

With secureBoot enabled in the firmware, wouldn't it reject any non-msft-digisig'd media as 'non-bootable'?

No.
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Matthew Garrett

About Matthew

Power management, mobile and firmware developer on Linux. Security developer at Aurora. Ex-biologist. [personal profile] mjg59 on Twitter. Content here should not be interpreted as the opinion of my employer. Also on Mastodon.

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