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
<?xml version="1.0"?>
<!-- * - nxml - * -->
< !DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
2023-12-25 17:48:33 +03:00
"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.
2020-11-14 17:21:39 +03:00
<!--
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
2021-10-13 22:18:12 +03:00
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.
2020-11-14 17:21:39 +03:00
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.
2020-11-14 17:21:39 +03:00
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
2023-12-23 20:33:12 +03:00
<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.
2020-11-14 17:21:39 +03:00
<para > The third field contains a path to the underlying block hash device, or a specification of a block device via
2023-12-23 20:33:12 +03:00
<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.
2020-11-14 17:21:39 +03:00
2023-12-23 20:26:34 +03:00
<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.
2020-11-14 17:21:39 +03:00
<para > The fifth field, if present, is a comma-delimited list of options. The following options are
recognized:</para>
<variablelist class= 'fstab-options' >
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<varlistentry >
<term > <option > superblock=<replaceable > BOOL</replaceable> </option> </term>
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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>
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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>
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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
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here; Multiples of 512 bytes.) </para>
<xi:include href= "version-info.xml" xpointer= "v254" /> </listitem>
2020-12-23 18:10:15 +03:00
</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
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here; Multiples of 512 bytes.)</para>
<xi:include href= "version-info.xml" xpointer= "v254" /> </listitem>
2020-12-23 18:10:15 +03:00
</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
2023-08-22 19:52:36 +03:00
used.</para>
<xi:include href= "version-info.xml" xpointer= "v254" /> </listitem>
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</varlistentry>
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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.)
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</para>
<xi:include href= "version-info.xml" xpointer= "v254" /> </listitem>
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</varlistentry>
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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>
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<xi:include href= "version-info.xml" xpointer= "v254" /> </listitem>
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</varlistentry>
<varlistentry >
<term > <option > uuid=<replaceable > UUID</replaceable> </option> </term>
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<listitem > <para > Use the provided <replaceable > UUID</replaceable> for format command instead of generating new one. The <replaceable > UUID</replaceable> must be
provided in standard <acronym > UUID</acronym> format, e.g. <literal > 12345678-1234-1234-1234-123456789abc</literal> .</para>
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<xi:include href= "version-info.xml" xpointer= "v254" /> </listitem>
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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>
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<listitem > <para > Defines what to do if a data verity problem is detected (data corruption). Without these
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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
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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
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
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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
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<warning >
<para > Use this option only in very specific cases. This option is available since Linux kernel version 4.5.</para>
</warning>
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<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
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
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<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>
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>
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<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
2023-08-22 19:52:36 +03:00
see <command > veritysetup --help</command> .</para>
<xi:include href= "version-info.xml" xpointer= "v254" /> </listitem>
2020-12-23 18:10:15 +03:00
</varlistentry>
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<varlistentry >
<term > <option > fec-device=<replaceable > PATH</replaceable> </option> </term>
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<listitem > <para > Use forward error correction (<acronym > FEC</acronym> ) to recover from corruption if hash verification fails. Use
2020-12-27 16:55:09 +03:00
encoding data from the specified device. The fec device argument can be block device or file image. For format,
if fec device path doesn't exist, it will be created as file. Note: block sizes for data and hash devices must
2023-08-22 19:52:36 +03:00
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>
2020-12-27 16:55:09 +03:00
</varlistentry>
<varlistentry >
<term > <option > fec-offset=<replaceable > BYTES</replaceable> </option> </term>
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
2023-08-22 19:52:36 +03:00
data. (Aligned on 512 bytes.)</para>
<xi:include href= "version-info.xml" xpointer= "v254" /> </listitem>
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>
2023-08-22 19:52:36 +03:00
<xi:include href= "version-info.xml" xpointer= "v254" />
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 >
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
2023-08-22 19:52:36 +03:00
version 5.4 or more recent.</para>
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>
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
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
2023-08-22 19:52:36 +03:00
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>
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
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.
2020-11-14 17:21:39 +03:00
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>
2022-09-23 15:59:02 +03:00
<para > All other verity protected block devices that contain file systems mounted in the initrd should
use this option.</para>
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>
</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>
2021-10-13 22:18:12 +03:00
<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.
2020-11-14 17:21:39 +03:00
<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>
2023-12-22 21:09:32 +03:00
<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.
2020-11-14 17:21:39 +03:00
</refsect1>
</refentry>