Daan De Meyer
9a8a4428bb
veritysetup: make root-hash-signature=auto optional
...
systemd-gpt-auto-generator always passes root-hash-signature=auto for
the root and /usr partitions. The data device doesn't have the
ID_DISSECT_PART_ROOTHASH_SIG udev property if the image has no signature
partition. In that case, systemd-veritysetup fails, and the system can't
boot from a verity image that isn't signed. If a signature exists but
neither the kernel nor userspace validates it, we activate the device
without the signature.
The image builder controls whether the image has a signature partition.
Whether the boot requires a signature thus depends on the image
contents. The failure gives no protection, because an image with a
signature that doesn't validate boots. Anyone can avoid the failure by
adding a signature partition with any well-formed signature. Whether a
signature is required must come from the host.
systemd-gpt-auto-generator enables root-hash-signature-required= if
systemd.image_policy= requires a signature. With that option, activation
fails if the signature is missing or invalid.
Let's activate the device without a signature if the property is
missing and root-hash-signature-required= isn't enabled.
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..
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