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man: document new rootfs support for pcrlock policies

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Lennart Poettering 2023-11-21 22:07:59 +01:00
parent c048d1d28d
commit 452486cdf6
1 changed files with 28 additions and 0 deletions
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man/systemd-pcrlock.xml
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@ -155,6 +155,19 @@
<para>If the new prediction matches the old this command terminates quickly and executes no further
operation. (Unless <option>--force</option> is specified, see below.)</para>
<para>Starting with v256, a copy of the <filename>/var/lib/systemd/pcrlock.json</filename> policy
file is encoded in a credential (see
<citerefentry><refentrytitle>systemd-creds</refentrytitle><manvolnum>1</manvolnum></citerefentry> for
details) and written to the EFI System Partition or XBOOTLDR partition, in the
<filename>/loader/credentials/</filename> subdirectory. There it is picked up at boot by
<citerefentry><refentrytitle>systemd-stub</refentrytitle><manvolnum>7</manvolnum></citerefentry> and
passed to the invoked initrd, where it can be used to unlock the root file system (which typically
contains <filename>/var/</filename>, which is where the primary copy of the policy is located, which
hence cannot be used to unlock the root file system). The credential file is named after the boot
entry token of the installation (see
<citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>), which
is configurable via the <option>--entry-token=</option> switch, see below.</para>
<xi:include href="version-info.xml" xpointer="v255"/>
</listitem>
</varlistentry>
@ -531,6 +544,18 @@
<xi:include href="version-info.xml" xpointer="v255"/></listitem>
</varlistentry>
<varlistentry>
<term><option>--entry-token=</option></term>
<listitem><para>Sets the boot entry token to use for the file name for the pcrlock policy credential
in the EFI System Partition or XBOOTLDR partition. See the
<citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> option of
the same regarding expected values. This switch has an effect on the
<command>make-policy</command> command only.</para>
<xi:include href="version-info.xml" xpointer="v256"/></listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="json" />
<xi:include href="standard-options.xml" xpointer="no-pager" />
<xi:include href="standard-options.xml" xpointer="help" />
@ -553,6 +578,9 @@
<member><citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>systemd-repart</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>systemd-pcrmachine.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>systemd-creds</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>systemd-stub</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
</simplelist></para>
</refsect1>