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Split the hardened UKI cmdline off the shared etc/kernel/cmdline.tmpl
so we can carry workarounds without poking the stock linux build.
Daily-driving linux-hardened on this hardware has reliably hung on
resume from S3: black screen, blinking caps-lock + power LED, only
the power button helps. The kernel journal stops at 'PM: suspend
entry (deep)' with nothing after, so the freeze is below the level
where logs can flush — characteristic of a hard hang inside a device
driver's suspend/resume callback rather than a userspace bug.
linux-hardened defaults init_on_free=1, which zeroes pages on free.
On Intel + iwlwifi/i915/nvme stacks this routinely surfaces latent
UAFs as suspend hangs that are invisible on stock linux. Drop that
knob to 0 for the hardened cmdline as the working hypothesis.
Add nmi_watchdog=panic, softlockup_panic=1, panic=10 so if the next
attempt still wedges, a stuck CPU self-panics and auto-reboots
within ~10s, giving us a 'journalctl -b -1 -k' trace to look at
instead of having to force-power-off blindly.
Stock linux is untouched.
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Keeping the fallback after all — leaves the door open to dropping the
stock 'linux' package entirely once linux-hardened is proven as a
daily driver. Without hardened-fallback, that future single-kernel
config would have zero autodetect recovery path.
This reverts commit c0c9183.
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Stock linux-fallback already covers the 'autodetect missed a module'
recovery scenario, regardless of which kernel you tried to boot.
hardened being opt-in means a hardened-default failure naturally
falls back to stock — no need for hardened-fallback as a second
safety net. Saves ESP space and mkinitcpio regen time on each
linux-hardened update.
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Installs linux-hardened + linux-hardened-headers alongside the stock
linux kernel. Stock kernel remains the default; linux-hardened is opt-in
via efibootmgr --bootnext after the EFI entry is registered (one-time
host-side step, documented in the preset).
After first 'just pkg-apply', mkinitcpio auto-builds
/boot/EFI/Linux/arch-linux-hardened.efi from the new preset (sharing
etc/kernel/cmdline.tmpl with the stock UKI — same LUKS root, no
kernel-specific cmdline knobs).
Host-side EFI entry registration:
sudo efibootmgr --create --disk /dev/nvme0n1 --part 1 \
--label 'Arch Hardened' --loader '\\EFI\\Linux\\arch-linux-hardened.efi'
Roll back any time by removing both packages and the preset file; the
stock kernel and its UKI are untouched.
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sommerfeld