amd64:
$ uname -a
Linux amd64-secureboot-testing 6.6.0-13-generic #13-Ubuntu SMP PREEMPT_DYNAMIC Tue Nov 21 15:42:23 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
$ sudo dmesg | grep locked
[ 0.000000] Kernel is locked down from EFI Secure Boot mode; see man kernel_lockdown.7
$ sudo dmesg | grep secure
[ 0.000000] secureboot: Secure boot enabled
arm64:
$ uname -a
Linux arm64-secureboot-testing 6.6.0-13-generic #13-Ubuntu SMP PREEMPT_DYNAMIC Tue Nov 21 16:11:51 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux
$ sudo dmesg | grep locked
[ 0.000000] Kernel is locked down from EFI Secure Boot mode; see man kernel_lockdown.7
$ sudo dmesg | grep secure
[ 0.000000] secureboot: Secure boot enabled
amd64: t-testing 6.6.0-13-generic #13-Ubuntu SMP PREEMPT_DYNAMIC Tue Nov 21 15:42:23 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
$ uname -a
Linux amd64-secureboo
$ sudo dmesg | grep locked
[ 0.000000] Kernel is locked down from EFI Secure Boot mode; see man kernel_lockdown.7
$ sudo dmesg | grep secure
[ 0.000000] secureboot: Secure boot enabled
$ cat /sys/kernel/ security/ lockdown
none [integrity] confidentiality
arm64: t-testing 6.6.0-13-generic #13-Ubuntu SMP PREEMPT_DYNAMIC Tue Nov 21 16:11:51 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux
$ uname -a
Linux arm64-secureboo
$ sudo dmesg | grep locked
[ 0.000000] Kernel is locked down from EFI Secure Boot mode; see man kernel_lockdown.7
$ sudo dmesg | grep secure
[ 0.000000] secureboot: Secure boot enabled
$ cat /sys/kernel/ security/ lockdown
none [integrity] confidentiality