Implemented a PoC for disabling kernel lockdown on Ubuntu via a keyboard emulated through USB/IP, CC
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Apparently Ubuntu's backport of the kernel lockdown patch set from 2 years ago had been completely broken until just recently: git.launchpad.net/~ubuntu-kernel
It didn't occur to me to search for another one, but yeah, I would have thought that someone would have tested the most trivial circumvention method before me.
FWIW: This bug did exist also in Fedora, but was fixed without a proper commit message.
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