systemd-veritysetup-generator(8) — Linux manual page


SYSTEMD...ENERATOR(8) systemd-veritysetup-generatorSYSTEMD...ENERATOR(8)

NAME         top

       systemd-veritysetup-generator - Unit generator for verity
       protected block devices

SYNOPSIS         top


DESCRIPTION         top

       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).


       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.

           Added in version 233.

           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 128-bit of the root
           hash, the hash partition device is looked for under a GPT
           partition UUID derived from the last 128-bit 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.

           Added in version 233.

       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

           Added in version 233.

           Takes a comma-separated list of dm-verity options. Expects
           the following options superblock=BOOLEAN, format=NUMBER,
           data-block-size=BYTES, hash-block-size=BYTES,
           data-blocks=BLOCKS, hash-offset=BYTES, salt=HEX, uuid=UUID,
           ignore-corruption, restart-on-corruption, ignore-zero-blocks,
           check-at-most-once, panic-on-corruption, hash=HASH,
           fec-device=PATH, fec-offset=BYTES, fec-roots=NUM and
           root-hash-signature=PATH|base64:HEX. See veritysetup(8) for
           more details.

           Added in version 248.

       usrhash=, systemd.verity_usr_data=, systemd.verity_usr_hash=,
           Equivalent to their counterparts for the root file system as
           described above, but apply to the /usr/ file system instead.

           Added in version 250.

SEE ALSO         top

       systemd(1), systemd-veritysetup@.service(8), veritysetup(8),

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨⟩.  If you have
       a bug report for this manual page, see
       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2023-12-22.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-12-22.)  If you discover any rendering
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       (which is not part of the original manual page), send a mail to

systemd 255                                        SYSTEMD...ENERATOR(8)

Pages that refer to this page: veritytab(5)kernel-command-line(7)systemd.directives(7)systemd.index(7)systemd-fstab-generator(8)systemd-veritysetup@.service(8)