SYSTEMD-VERITYSETUP-GENERsystemd-veritysetup-gSYSTEMD-VERITYSETUP-GENERATOR(8)
NAME
systemd-veritysetup-generator - Unit generator for verity protected
block devices
SYNOPSIS
/lib/systemd/system-generators/systemd-veritysetup-generator
DESCRIPTION
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 SYSTEMD-VERITYSETUP-GENERATOR(8)
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