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veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
man: use same version in public and system ident.
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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<!--
SPDX-License-Identifier: LGPL-2.1-or-later
This is based on crypttab(5).
-->
<refentry id="veritytab" conditional='HAVE_LIBCRYPTSETUP' xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>veritytab</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>veritytab</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>veritytab</refname>
<refpurpose>Configuration for verity block devices</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>/etc/veritytab</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>The <filename>/etc/veritytab</filename> file describes
dm-verity: Remove usage of integrity There is a difference between dm-verity and dm-integrity. Remove usage of integrity from verity documentation in man pages and target files.
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verity protected block devices that are set up during
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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system boot.</para>
<para>Empty lines and lines starting with the <literal>#</literal>
character are ignored. Each of the remaining lines describes one
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verity protected block device. Fields are delimited by
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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white space.</para>
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<para>Each line is in the form<programlisting><replaceable>volume-name</replaceable> <replaceable>data-device</replaceable> <replaceable>hash-device</replaceable> <replaceable>roothash</replaceable> <optional><replaceable>options</replaceable></optional></programlisting>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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The first four fields are mandatory, the remaining one is optional.</para>
<para>The first field contains the name of the resulting verity volume; its block device is set up
below <filename>/dev/mapper/</filename>.</para>
<para>The second field contains a path to the underlying block data device, or a specification of a block device via
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<varname>UUID=</varname> followed by the <replaceable>UUID</replaceable>.</para>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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<para>The third field contains a path to the underlying block hash device, or a specification of a block device via
man: sprinkle some more markup around
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<varname>UUID=</varname> followed by the <replaceable>UUID</replaceable>.</para>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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man: use better-fitting markup
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<para>The fourth field is the <replaceable>roothash</replaceable> in hexadecimal.</para>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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<para>The fifth field, if present, is a comma-delimited list of options. The following options are
recognized:</para>
<variablelist class='fstab-options'>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
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<varlistentry>
<term><option>superblock=<replaceable>BOOL</replaceable></option></term>
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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<listitem><para>Use dm-verity with or without permanent on-disk superblock.</para>
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
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</varlistentry>
<varlistentry>
<term><option>format=<replaceable>NUMBER</replaceable></option></term>
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<listitem><para>Specifies the hash version type. Format type <literal>0</literal> is original Chrome OS version. Format type <literal>1</literal> is
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modern version.</para>
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
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</varlistentry>
<varlistentry>
<term><option>data-block-size=<replaceable>BYTES</replaceable></option></term>
<listitem><para>Used block size for the data device. (Note kernel supports only page-size as maximum
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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here; Multiples of 512 bytes.) </para>
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
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</varlistentry>
<varlistentry>
<term><option>hash-block-size=<replaceable>BYTES</replaceable></option></term>
<listitem><para>Used block size for the hash device. (Note kernel supports only page-size as maximum
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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here; Multiples of 512 bytes.)</para>
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
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</varlistentry>
<varlistentry>
<term><option>data-blocks=<replaceable>BLOCKS</replaceable></option></term>
<listitem><para>Number of blocks of data device used in verification. If not specified, the whole device is
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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used.</para>
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
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</varlistentry>
veritysetup: add support for hash-offset option The verity parameter hash_area_offset allows to locate the superblock in the hash device. It can be used to have a single device which contains both data and hashes. This adds the option hash-offset=BYTES (sixth argument) which is the equivalent of the option --hash-offset in the veritysetup world. See `veritysetup(8)` for more details.
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<varlistentry>
<term><option>hash-offset=<replaceable>BYTES</replaceable></option></term>
<listitem><para>Offset of hash area/superblock on <literal>hash-device</literal>. (Multiples of 512 bytes.)
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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</para>
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for hash-offset option The verity parameter hash_area_offset allows to locate the superblock in the hash device. It can be used to have a single device which contains both data and hashes. This adds the option hash-offset=BYTES (sixth argument) which is the equivalent of the option --hash-offset in the veritysetup world. See `veritysetup(8)` for more details.
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</varlistentry>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
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<varlistentry>
<term><option>salt=<replaceable>HEX</replaceable></option></term>
<listitem><para>Salt used for format or verification. Format is a hexadecimal string; 256 bytes long maximum;
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<literal>-</literal> is the special value for empty.</para>
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
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</varlistentry>
<varlistentry>
<term><option>uuid=<replaceable>UUID</replaceable></option></term>
man: fix a few issues in manpage fix: #31482 Signed-off-by: cunshunxia <cunshunxia@tencent.com>
2024-02-29 05:46:25 +03:00
<listitem><para>Use the provided <replaceable>UUID</replaceable> instead of generating new one. The <replaceable>UUID</replaceable> must be
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provided in standard <acronym>UUID</acronym> format, e.g. <literal>12345678-1234-1234-1234-123456789abc</literal>.</para>
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
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</varlistentry>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
<varlistentry>
<term><option>ignore-corruption</option></term>
<term><option>restart-on-corruption</option></term>
<term><option>panic-on-corruption</option></term>
dm-verity: Remove usage of integrity There is a difference between dm-verity and dm-integrity. Remove usage of integrity from verity documentation in man pages and target files.
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<listitem><para>Defines what to do if a data verity problem is detected (data corruption). Without these
man: sprinkle some more markup around
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options kernel fails the <acronym>IO</acronym> operation with <acronym>I/O</acronym> error. With <option>--ignore-corruption</option> option the
man: use better-fitting markup
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corruption is only logged. With <option>--restart-on-corruption</option> or
<option>--panic-on-corruption</option> the kernel is restarted (panicked) immediately.
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
2023-08-22 19:52:36 +03:00
(You have to provide way how to avoid restart loops.)</para>
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
</varlistentry>
<varlistentry>
<term><option>ignore-zero-blocks</option></term>
<listitem><para>Instruct kernel to not verify blocks that are expected to contain zeroes and always directly
man: use <warning> for warnings
2023-12-23 20:40:15 +03:00
return zeroes instead.</para>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
man: use <warning> for warnings
2023-12-23 20:40:15 +03:00
<warning>
<para>Use this option only in very specific cases. This option is available since Linux kernel version 4.5.</para>
</warning>
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
2023-08-22 19:52:36 +03:00
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
</varlistentry>
<varlistentry>
<term><option>check-at-most-once</option></term>
<listitem><para>Instruct kernel to verify blocks only the first time they are read from the data device, rather
man: use <warning> for warnings
2023-12-23 20:40:15 +03:00
than every time.</para>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
man: use <warning> for warnings
2023-12-23 20:40:15 +03:00
<warning>
<para>It provides a reduced level of security because only offline tampering of the data device's content
will be detected, not online tampering. This option is available since Linux kernel version 4.17.</para>
</warning>
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
2023-08-22 19:52:36 +03:00
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
</varlistentry>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
2020-12-23 18:10:15 +03:00
<varlistentry>
<term><option>hash=<replaceable>HASH</replaceable></option></term>
<listitem><para>Hash algorithm for dm-verity. This should be the name of the algorithm, like "sha1". For default
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
2023-08-22 19:52:36 +03:00
see <command>veritysetup --help</command>.</para>
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for superblock and underlying options The verity parameter no_superblock allows to format/open an hash device without the superblock. However, the superblock data must be set to open the data-device. This adds the option superblocks (sixth argument) and all the underlying options which are implied to set the superblock manually if hash device has no superblock: - superblock=BOOL - format=NUMBER (hash version type, 0 for original ChromeOS, 1 for modern) - data-block-size=BYTES (max page-size, multiple of 512) - hash-block-size=BYTES (max page-size, multiple of 512) - data-blocks=BLOCKS (size of data-device in blocks) - salt=HEXSTR (salt used at format, max 256 bytes) - uuid=UUID - hash=STR (algorithm name for dm-verity used at format, default is sha256) See `veritysetup(8)` for more details.
2020-12-23 18:10:15 +03:00
</varlistentry>
veritysetup: add support for fec options The verity fec_* parameters allows to use Forward Error Correction to recover from corruption if hash verification fails. This adds the options fec_device, fec_offset and fec_roots (sixth argument) which are the equivalent of the options --fec-device, --fec-offset and --fec-roots in the veritysetup world. - fec-device=FILE - fec-offset=BYTES - fec-roots=UINT64 See `veritysetup(8)` for more details.
2020-12-27 16:55:09 +03:00
<varlistentry>
<term><option>fec-device=<replaceable>PATH</replaceable></option></term>
man: sprinkle some more markup around
2023-12-23 20:33:12 +03:00
<listitem><para>Use forward error correction (<acronym>FEC</acronym>) to recover from corruption if hash verification fails. Use
man: fix a few issues in manpage fix: #31482 Signed-off-by: cunshunxia <cunshunxia@tencent.com>
2024-02-29 05:46:25 +03:00
encoding data from the specified device. The fec device argument can be block device or file image.
If fec device path doesn't exist, it will be created as file. Note: block sizes for data and hash devices must
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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match. Also, if the verity data_device is encrypted the fec_device should be too.</para>
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for fec options The verity fec_* parameters allows to use Forward Error Correction to recover from corruption if hash verification fails. This adds the options fec_device, fec_offset and fec_roots (sixth argument) which are the equivalent of the options --fec-device, --fec-offset and --fec-roots in the veritysetup world. - fec-device=FILE - fec-offset=BYTES - fec-roots=UINT64 See `veritysetup(8)` for more details.
2020-12-27 16:55:09 +03:00
</varlistentry>
<varlistentry>
<term><option>fec-offset=<replaceable>BYTES</replaceable></option></term>
man: sprinkle some more markup around
2023-12-23 20:33:12 +03:00
<listitem><para>This is the offset, in bytes, from the start of the <acronym>FEC</acronym> device to the beginning of the encoding
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
2023-08-22 19:52:36 +03:00
data. (Aligned on 512 bytes.)</para>
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
veritysetup: add support for fec options The verity fec_* parameters allows to use Forward Error Correction to recover from corruption if hash verification fails. This adds the options fec_device, fec_offset and fec_roots (sixth argument) which are the equivalent of the options --fec-device, --fec-offset and --fec-roots in the veritysetup world. - fec-device=FILE - fec-offset=BYTES - fec-roots=UINT64 See `veritysetup(8)` for more details.
2020-12-27 16:55:09 +03:00
</varlistentry>
<varlistentry>
<term><option>fec-roots=<replaceable>NUM</replaceable></option></term>
<listitem><para>Number of generator roots. This equals to the number of parity bytes in the encoding data. In
RS(M, N) encoding, the number of roots is M-N. M is 255 and M-N is between 2 and 24 (including).</para>
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
2023-08-22 19:52:36 +03:00
<xi:include href="version-info.xml" xpointer="v254"/>
veritysetup: add support for fec options The verity fec_* parameters allows to use Forward Error Correction to recover from corruption if hash verification fails. This adds the options fec_device, fec_offset and fec_roots (sixth argument) which are the equivalent of the options --fec-device, --fec-offset and --fec-roots in the veritysetup world. - fec-device=FILE - fec-offset=BYTES - fec-roots=UINT64 See `veritysetup(8)` for more details.
2020-12-27 16:55:09 +03:00
</listitem>
</varlistentry>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
<varlistentry>
man: update root-hash-signature option with value This documents two possible values expected by the option root-hash-signature for veritytab and veritysetup-generator.
2021-02-25 21:02:26 +03:00
<term><option>root-hash-signature=<replaceable>PATH</replaceable>|base64:<replaceable>HEX</replaceable></option></term>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
<listitem><para>A base64 string encoding the root hash signature prefixed by <literal>base64:</literal> or a
path to roothash signature file used to verify the root hash (in kernel). This feature requires Linux kernel
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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version 5.4 or more recent.</para>
man: update version information As I noticed a lot of missing information when trying to implement checking for missing info. I reimplemented the version information script to be more robust, and here is the result. Follow up to ec07c3c80b2b1bfa6788500202006ff85f5ae4f4
2023-09-18 18:03:38 +03:00
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
</varlistentry>
<varlistentry>
<term><option>_netdev</option></term>
<listitem><para>Marks this veritysetup device as requiring network. It will be
started after the network is available, similarly to
<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
units marked with <option>_netdev</option>. The service unit to set up this device
will be ordered between <filename>remote-fs-pre.target</filename> and
<filename>remote-veritysetup.target</filename>, instead of
<filename>veritysetup-pre.target</filename> and
<filename>veritysetup.target</filename>.</para>
<para>Hint: if this device is used for a mount point that is specified in
<citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
the <option>_netdev</option> option should also be used for the mount
point. Otherwise, a dependency loop might be created where the mount point
will be pulled in by <filename>local-fs.target</filename>, while the
service to configure the network is usually only started <emphasis>after</emphasis>
the local file system has been mounted.</para>
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
2023-08-22 19:52:36 +03:00
<xi:include href="version-info.xml" xpointer="v248"/>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
</listitem>
</varlistentry>
<varlistentry>
<term><option>noauto</option></term>
<listitem><para>This device will not be added to <filename>veritysetup.target</filename>.
This means that it will not be automatically enabled on boot, unless something else pulls
it in. In particular, if the device is used for a mount point, it'll be enabled
automatically during boot, unless the mount point itself is also disabled with
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
2023-08-22 19:52:36 +03:00
<option>noauto</option>.</para>
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
</varlistentry>
<varlistentry>
<term><option>nofail</option></term>
<listitem><para>This device will not be a hard dependency of
<filename>veritysetup.target</filename>. It'll still be pulled in and started, but the system
will not wait for the device to show up and be enabled, and boot will not fail if this is
unsuccessful. Note that other units that depend on the enabled device may still fail. In
particular, if the device is used for a mount point, the mount point itself also needs to
have the <option>nofail</option> option, or the boot will fail if the device is not enabled
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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successfully.</para>
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
</varlistentry>
<varlistentry>
<term><option>x-initrd.attach</option></term>
tree-wide: use the term "initrd" at most places we so far used "initramfs" In most cases we refernced the concept as "initrd". Let's convert most remaining uses of "initramfs" to "initrd" too, to stay internally consistent. This leaves "initramfs" only where it's relevant to explain historical concepts or where "initramfs" is part of the API (i.e. in /run/initramfs). Follow-up for: b66a6e1a5838b874b789820c090dd6850cf10513
2022-09-23 15:59:02 +03:00
<listitem><para>Setup this verity protected block device in the initrd, similarly to
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
2020-11-14 17:21:39 +03:00
<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
units marked with <option>x-initrd.mount</option>.</para>
<para>Although it's not necessary to mark the mount entry for the root file system with
<option>x-initrd.mount</option>, <option>x-initrd.attach</option> is still recommended with
dm-verity: Remove usage of integrity There is a difference between dm-verity and dm-integrity. Remove usage of integrity from verity documentation in man pages and target files.
2021-10-13 22:18:12 +03:00
the verity protected block device containing the root file system as otherwise systemd
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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will attempt to detach the device during the regular system shutdown while it's still in
use. With this option the device will still be detached but later after the root file
system is unmounted.</para>
tree-wide: use the term "initrd" at most places we so far used "initramfs" In most cases we refernced the concept as "initrd". Let's convert most remaining uses of "initramfs" to "initrd" too, to stay internally consistent. This leaves "initramfs" only where it's relevant to explain historical concepts or where "initramfs" is part of the API (i.e. in /run/initramfs). Follow-up for: b66a6e1a5838b874b789820c090dd6850cf10513
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<para>All other verity protected block devices that contain file systems mounted in the initrd should
use this option.</para>
man: add version info This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
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<xi:include href="version-info.xml" xpointer="v248"/>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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</listitem>
</varlistentry>
</variablelist>
<para>At early boot and when the system manager configuration is
reloaded, this file is translated into native systemd units by
<citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
</refsect1>
<refsect1>
<title>Examples</title>
<example>
<title>/etc/veritytab example</title>
dm-verity: Remove usage of integrity There is a difference between dm-verity and dm-integrity. Remove usage of integrity from verity documentation in man pages and target files.
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<para>Set up two verity protected block devices. One using device blocks, another using files.</para>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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<programlisting>usr PARTUUID=783e45ae-7aa3-484a-beef-a80ff9c19cbb PARTUUID=21dc1dfe-4c33-8b48-98a9-918a22eb3e37 36e3f740ad502e2c25e2a23d9c7c17bf0fdad2300b7580842d4b7ec1fb0fa263 auto
data /etc/data /etc/hash a5ee4b42f70ae1f46a08a7c92c2e0a20672ad2f514792730f5d49d7606ab8fdf auto
</programlisting>
</example>
</refsect1>
<refsect1>
<title>See Also</title>
man: use <simplelist> for 'See also' sections This is just a slight markup improvement; there should be no difference in rendering.
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<para><simplelist type="inline">
<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>systemd-veritysetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>systemd-veritysetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
<member><citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
<member><citerefentry project='die-net'><refentrytitle>veritysetup</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
</simplelist></para>
veritysetup-generator: add support for veritytab This adds the support for veritytab. The veritytab file contains at most five fields, the first four are mandatory, the last one is optional: - The first field contains the name of the resulting verity volume; its block device is set up /dev/mapper/</filename>. - The second field contains a path to the underlying block data device, or a specification of a block device via UUID= followed by the UUID. - The third field contains a path to the underlying block hash device, or a specification of a block device via UUID= followed by the UUID. - The fourth field is the roothash in hexadecimal. - The fifth field, if present, is a comma-delimited list of options. The following options are recognized only: ignore-corruption, restart-on-corruption, panic-on-corruption, ignore-zero-blocks, check-at-most-once and root-hash-signature. The others options will be implemented later. Also, this adds support for the new kernel verity command line boolean option "veritytab" which enables the read for veritytab, and the new environment variable SYSTEMD_VERITYTAB which sets the path to the file veritytab to read.
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</refsect1>
</refentry>
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