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

NAME | SYNOPSIS | DESCRIPTION | KERNEL COMMAND LINE | SEE ALSO | COLOPHON

SYSTEMD-VERITYSETUP-GENERATOR(8)ritysetup-generatorITYSETUP-GENERATOR(8)

NAME         top

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

SYNOPSIS         top

       /usr/lib/systemd/system-generators/systemd-veritysetup-generator

DESCRIPTION         top

       systemd-veritysetup-generator is a generator that translates
       kernel command line options configuring integrity-protected block
       devices (verity) 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 a single verity device may be set up with this
       generator, backing the root file system of the OS.

       systemd-veritysetup-generator implements systemd.generator(7).

KERNEL COMMAND LINE         top

       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 initial RAM disk (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 an integrity 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 integrity 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. See veritysetup(8) for more details.

SEE ALSO         top

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

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have
       a bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2021-08-27.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-08-27.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

systemd 249                             SYSTEMD-VERITYSETUP-GENERATOR(8)

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