NAME
systemd-veritysetup-generator - Unit generator for verity protected block devicesSYNOPSIS
/lib/systemd/system-generators/systemd-veritysetup-generatorDESCRIPTION
systemd-veritysetup-generator is a generator that translates kernel command line options configuring verity protected block devices into native systemd units early at boot and when configuration of the system manager is reloaded. This will create systemd-veritysetup@.service(8) units as necessary. Currently, only two verity devices may be set up with this generator, backing the root and /usr file systems of the OS. systemd-veritysetup-generator implements systemd.generator(7).KERNEL COMMAND LINE
systemd-veritysetup-generator understands the following kernel command line parameters: systemd.verity=, rd.systemd.verity=Takes a boolean argument. Defaults to
"yes". If "no", disables the generator entirely.
rd.systemd.verity= is honored only by the initrd while
systemd.verity= is honored by both the host system and the
initrd.
roothash=
Takes a root hash value for the root file
system. Expects a hash value formatted in hexadecimal characters of the
appropriate length (i.e. most likely 256 bit/64 characters, or longer). If not
specified via systemd.verity_root_data= and
systemd.verity_root_hash=, the hash and data devices to use are
automatically derived from the specified hash value. Specifically, the data
partition device is looked for under a GPT partition UUID derived from the
first 128bit of the root hash, the hash partition device is looked for under a
GPT partition UUID derived from the last 128bit of the root hash. Hence it is
usually sufficient to specify the root hash to boot from a verity protected
root file system, as device paths are automatically determined from it
— as long as the partition table is properly set up.
systemd.verity_root_data=, systemd.verity_root_hash=
These two settings take block device paths as
arguments and may be used to explicitly configure the data partition and hash
partition to use for setting up the verity protection for the root file
system. If not specified, these paths are automatically derived from the
roothash= argument (see above).
systemd.verity_root_options=
Takes a comma-separated list of dm-verity
options. Expects the following options ignore-corruption,
restart-on-corruption, ignore-zero-blocks,
check-at-most-once, panic-on-corruption and
root-hash-signature=
PATH|base64:HEX. See veritysetup(8)
for more details.
usrhash=, systemd.verity_usr_data=,
systemd.verity_usr_hash=, systemd.verity_usr_options=
Equivalent to their counterparts for the root
file system as described above, but apply to the /usr/ file system
instead.
SEE ALSO
systemd(1), systemd-veritysetup@.service(8), veritysetup(8), systemd-fstab-generator(8)systemd 252 |