]>
Commit | Line | Data |
---|---|---|
ca1092dc LP |
1 | <?xml version="1.0"?> |
2 | <!--*-nxml-*--> | |
3 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" | |
4 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
5 | <!-- SPDX-License-Identifier: LGPL-2.1-or-later --> | |
dfca5587 | 6 | <refentry id="systemd-measure" xmlns:xi="http://www.w3.org/2001/XInclude" conditional='ENABLE_BOOTLOADER'> |
ca1092dc LP |
7 | |
8 | <refentryinfo> | |
9 | <title>systemd-measure</title> | |
10 | <productname>systemd</productname> | |
11 | </refentryinfo> | |
12 | ||
13 | <refmeta> | |
14 | <refentrytitle>systemd-measure</refentrytitle> | |
15 | <manvolnum>1</manvolnum> | |
16 | </refmeta> | |
17 | ||
18 | <refnamediv> | |
19 | <refname>systemd-measure</refname> | |
cdaaa62c | 20 | <refpurpose>Pre-calculate and sign expected TPM2 PCR values for booted unified kernel images</refpurpose> |
ca1092dc LP |
21 | </refnamediv> |
22 | ||
23 | <refsynopsisdiv> | |
24 | <cmdsynopsis> | |
25 | <command>/usr/lib/systemd/systemd-measure <arg choice="opt" rep="repeat">OPTIONS</arg></command> | |
26 | </cmdsynopsis> | |
27 | </refsynopsisdiv> | |
28 | ||
29 | <refsect1> | |
30 | <title>Description</title> | |
31 | ||
32 | <para>Note: this command is experimental for now. While it is likely to become a regular component of | |
33 | systemd, it might still change in behaviour and interface.</para> | |
34 | ||
cdaaa62c | 35 | <para><command>systemd-measure</command> is a tool that may be used to pre-calculate and sign the |
048bcb9d ZJS |
36 | expected TPM2 PCR 11 values that should be seen when a Linux <ulink |
37 | url="https://uapi-group.org/specifications/specs/unified_kernel_image/">Unified Kernel Image | |
38 | (UKI)</ulink> based on | |
ca1092dc | 39 | <citerefentry><refentrytitle>systemd-stub</refentrytitle><manvolnum>7</manvolnum></citerefentry> is |
55c041b4 LP |
40 | booted up. It accepts paths to the ELF kernel image file, initrd image file, devicetree file, kernel |
41 | command line file, | |
2deca517 LP |
42 | <citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry> file, boot |
43 | splash file, and TPM2 PCR PEM public key file that make up the unified kernel image, and determines the | |
44 | PCR values expected to be in place after booting the image. Calculation starts with a zero-initialized | |
048bcb9d ZJS |
45 | PCR 11, and is executed in a fashion compatible with what <filename>systemd-stub</filename> does at boot. |
46 | The result may optionally be signed cryptographically, to allow TPM2 policies that can only be unlocked | |
47 | if a certain set of kernels is booted, for which such a PCR signature can be provided.</para> | |
48 | ||
49 | <para>It usually doesn't make sense to call this tool directly when constructing a UKI. Instead, | |
50 | <citerefentry><refentrytitle>ukify</refentrytitle><manvolnum>1</manvolnum></citerefentry> should be used; | |
51 | it will invoke <command>systemd-measure</command> and take care of embedding the resulting measurements | |
52 | into the UKI.</para> | |
ca1092dc LP |
53 | </refsect1> |
54 | ||
55 | <refsect1> | |
56 | <title>Commands</title> | |
57 | ||
58 | <para>The following commands are understood:</para> | |
59 | ||
60 | <variablelist> | |
61 | <varlistentry> | |
62 | <term><command>status</command></term> | |
63 | ||
64 | <listitem><para>This is the default command if none is specified. This queries the local system's | |
65 | TPM2 PCR 11+12+13 values and displays them. The data is written in a similar format as the | |
66 | <command>calculate</command> command below, and may be used to quickly compare expectation with | |
ec07c3c8 AK |
67 | reality.</para> |
68 | ||
69 | <xi:include href="version-info.xml" xpointer="v252"/></listitem> | |
ca1092dc LP |
70 | </varlistentry> |
71 | ||
72 | <varlistentry> | |
73 | <term><command>calculate</command></term> | |
74 | ||
cdaaa62c | 75 | <listitem><para>Pre-calculate the expected values seen in PCR register 11 after boot-up of a unified |
ca1092dc LP |
76 | kernel image consisting of the components specified with <option>--linux=</option>, |
77 | <option>--osrel=</option>, <option>--cmdline=</option>, <option>--initrd=</option>, | |
d5f91cf7 LB |
78 | <option>--splash=</option>, <option>--dtb=</option>, <option>--sbat=</option>, |
79 | <option>--pcrpkey=</option> see below. Only <option>--linux=</option> is mandatory. (Alternatively, | |
80 | specify <option>--current</option> to use the current values of PCR register 11 instead.)</para> | |
ec07c3c8 AK |
81 | |
82 | <xi:include href="version-info.xml" xpointer="v252"/> | |
d5f91cf7 | 83 | </listitem> |
cdaaa62c LP |
84 | </varlistentry> |
85 | ||
86 | <varlistentry> | |
87 | <term><command>sign</command></term> | |
88 | ||
89 | <listitem><para>As with the <command>calculate</command> command, pre-calculate the expected value | |
90 | seen in TPM2 PCR register 11 after boot-up of a unified kernel image. Then, cryptographically sign | |
91 | the resulting values with the private/public key pair (RSA) configured via | |
92 | <option>--private-key=</option> and <option>--public-key=</option>. This will write a JSON object to | |
8b9f0921 | 93 | standard output that contains signatures for all specified PCR banks (see the |
916db27f | 94 | <option>--bank=</option> option below), which may be used to unlock encrypted credentials (see |
cdaaa62c LP |
95 | <citerefentry><refentrytitle>systemd-creds</refentrytitle><manvolnum>1</manvolnum></citerefentry>) or |
96 | LUKS volumes (see | |
8b9f0921 ZJS |
97 | <citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>). |
98 | This allows binding secrets to a set of kernels for which such PCR 11 signatures can be | |
99 | provided.</para> | |
cdaaa62c LP |
100 | |
101 | <para>Note that a TPM2 device must be available for this signing to take place, even though the | |
ec07c3c8 AK |
102 | result is not tied to any TPM2 device or its state.</para> |
103 | ||
104 | <xi:include href="version-info.xml" xpointer="v252"/></listitem> | |
ca1092dc LP |
105 | </varlistentry> |
106 | </variablelist> | |
107 | </refsect1> | |
108 | ||
109 | <refsect1> | |
110 | <title>Options</title> | |
111 | ||
112 | <para>The following options are understood:</para> | |
113 | ||
114 | <variablelist> | |
115 | <varlistentry> | |
8b9f0921 ZJS |
116 | <term><option>--linux=<replaceable>PATH</replaceable></option></term> |
117 | <term><option>--osrel=<replaceable>PATH</replaceable></option></term> | |
118 | <term><option>--cmdline=<replaceable>PATH</replaceable></option></term> | |
119 | <term><option>--initrd=<replaceable>PATH</replaceable></option></term> | |
120 | <term><option>--splash=<replaceable>PATH</replaceable></option></term> | |
121 | <term><option>--dtb=<replaceable>PATH</replaceable></option></term> | |
d5f91cf7 | 122 | <term><option>--sbat=<replaceable>PATH</replaceable></option></term> |
8b9f0921 | 123 | <term><option>--pcrpkey=<replaceable>PATH</replaceable></option></term> |
ca1092dc | 124 | |
cdaaa62c LP |
125 | <listitem><para>When used with the <command>calculate</command> or <command>sign</command> verb, |
126 | configures the files to read the unified kernel image components from. Each option corresponds with | |
127 | the equally named section in the unified kernel PE file. The <option>--linux=</option> switch expects | |
128 | the path to the ELF kernel file that the unified PE kernel will wrap. All switches except | |
aefdc112 AK |
129 | <option>--linux=</option> are optional. Each option may be used at most once.</para> |
130 | ||
131 | <xi:include href="version-info.xml" xpointer="v252"/></listitem> | |
ca1092dc LP |
132 | </varlistentry> |
133 | ||
127b72da LP |
134 | <varlistentry> |
135 | <term><option>--current</option></term> | |
cdaaa62c LP |
136 | <listitem><para>When used with the <command>calculate</command> or <command>sign</command> verb, |
137 | takes the PCR 11 values currently in effect for the system (which should typically reflect the hashes | |
138 | of the currently booted kernel). This can be used in place of <option>--linux=</option> and the other | |
ec07c3c8 AK |
139 | switches listed above.</para> |
140 | ||
141 | <xi:include href="version-info.xml" xpointer="v252"/></listitem> | |
127b72da LP |
142 | </varlistentry> |
143 | ||
ca1092dc | 144 | <varlistentry> |
8b9f0921 | 145 | <term><option>--bank=<replaceable>DIGEST</replaceable></option></term> |
ca1092dc LP |
146 | |
147 | <listitem><para>Controls the PCR banks to pre-calculate the PCR values for – in case | |
cdaaa62c LP |
148 | <command>calculate</command> or <command>sign</command> is invoked –, or the banks to show in the |
149 | <command>status</command> output. May be used more then once to specify multiple banks. If not | |
150 | specified, defaults to the four banks <literal>sha1</literal>, <literal>sha256</literal>, | |
ec07c3c8 AK |
151 | <literal>sha384</literal>, <literal>sha512</literal>.</para> |
152 | ||
153 | <xi:include href="version-info.xml" xpointer="v252"/></listitem> | |
cdaaa62c LP |
154 | </varlistentry> |
155 | ||
156 | <varlistentry> | |
8b9f0921 ZJS |
157 | <term><option>--private-key=<replaceable>PATH</replaceable></option></term> |
158 | <term><option>--public-key=<replaceable>PATH</replaceable></option></term> | |
cdaaa62c LP |
159 | |
160 | <listitem><para>These switches take paths to a pair of PEM encoded RSA key files, for use with | |
2deca517 LP |
161 | the <command>sign</command> command.</para> |
162 | ||
163 | <para>Note the difference between the <option>--pcrpkey=</option> and <option>--public-key=</option> | |
164 | switches. The former selects the data to include in the <literal>.pcrpkey</literal> PE section of the | |
165 | unified kernel image, the latter picks the public key of the key pair used to sign the resulting PCR | |
166 | 11 values. The former is the key that the booted system will likely use to lock disk and credential | |
167 | encryption to, the latter is the key used for unlocking such resources again. Hence, typically the | |
a434e25f LP |
168 | same PEM key should be supplied in both cases.</para> |
169 | ||
170 | <para>If the <option>--public-key=</option> is not specified but <option>--private-key=</option> is | |
ec07c3c8 AK |
171 | specified the public key is automatically derived from the private key.</para> |
172 | ||
173 | <xi:include href="version-info.xml" xpointer="v252"/></listitem> | |
cdaaa62c LP |
174 | </varlistentry> |
175 | ||
176 | <varlistentry> | |
177 | <term><option>--tpm2-device=</option><replaceable>PATH</replaceable></term> | |
178 | ||
179 | <listitem><para>Controls which TPM2 device to use. Expects a device node path referring to the TPM2 | |
180 | chip (e.g. <filename>/dev/tpmrm0</filename>). Alternatively the special value <literal>auto</literal> | |
181 | may be specified, in order to automatically determine the device node of a suitable TPM2 device (of | |
182 | which there must be exactly one). The special value <literal>list</literal> may be used to enumerate | |
ec07c3c8 AK |
183 | all suitable TPM2 devices currently discovered.</para> |
184 | ||
185 | <xi:include href="version-info.xml" xpointer="v252"/></listitem> | |
ca1092dc LP |
186 | </varlistentry> |
187 | ||
6ca00163 LP |
188 | <varlistentry> |
189 | <term><option>--phase=</option><replaceable>PHASE</replaceable></term> | |
190 | ||
0923b425 | 191 | <listitem><para>Controls which boot phases to calculate expected PCR 11 values for. This takes a |
6ca00163 LP |
192 | series of colon-separated strings that encode boot "paths" for entering a specific phase of the boot |
193 | process. Each of the specified strings is measured by the | |
194 | <filename>systemd-pcrphase-initrd.service</filename> and | |
195 | <citerefentry><refentrytitle>systemd-pcrphase.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
196 | into PCR 11 during different milestones of the boot process. This switch may be specified multiple | |
197 | times to calculate PCR values for multiple boot phases at once. If not used defaults to | |
198 | <literal>enter-initrd</literal>, <literal>enter-initrd:leave-initrd</literal>, | |
047273e6 LP |
199 | <literal>enter-initrd:leave-initrd:sysinit</literal>, |
200 | <literal>enter-initrd:leave-initrd:sysinit:ready</literal>, i.e. calculates expected PCR values for | |
201 | the boot phase in the initrd, during early boot, during later boot, and during system runtime, but | |
202 | excluding the phases before the initrd or when shutting down. This setting is honoured both by | |
203 | <command>calculate</command> and <command>sign</command>. When used with the latter it's particularly | |
204 | useful for generating PCR signatures that can only be used for unlocking resources during specific | |
205 | parts of the boot process.</para> | |
6ca00163 LP |
206 | |
207 | <para>For further details about PCR boot phases, see | |
ec07c3c8 AK |
208 | <citerefentry><refentrytitle>systemd-pcrphase.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para> |
209 | ||
210 | <xi:include href="version-info.xml" xpointer="v252"/></listitem> | |
6ca00163 LP |
211 | </varlistentry> |
212 | ||
a5c690a8 LP |
213 | <varlistentry> |
214 | <term><option>--append=</option><replaceable>PATH</replaceable></term> | |
215 | ||
216 | <listitem><para>When generating a PCR JSON signature (via the <command>sign</command> command), | |
217 | combine it with a previously generated PCR JSON signature, and output it as one. The specified path | |
218 | must refer to a regular file that contains a valid JSON PCR signature object. The specified file is | |
219 | not modified. It will be read first, then the newly generated signature appended to it, and the | |
220 | resulting object is written to standard output. Use this to generate a single JSON object consisting | |
221 | from signatures made with a number of signing keys (for example, to have one key per boot phase). The | |
222 | command will suppress duplicates: if a specific signature is already included in a JSON signature | |
ec07c3c8 AK |
223 | object it is not added a second time.</para> |
224 | ||
225 | <xi:include href="version-info.xml" xpointer="v253"/></listitem> | |
a5c690a8 LP |
226 | </varlistentry> |
227 | ||
c06b6d46 LP |
228 | <xi:include href="standard-options.xml" xpointer="json" /> |
229 | <xi:include href="standard-options.xml" xpointer="no-pager" /> | |
ca1092dc LP |
230 | <xi:include href="standard-options.xml" xpointer="help" /> |
231 | <xi:include href="standard-options.xml" xpointer="version" /> | |
232 | </variablelist> | |
233 | </refsect1> | |
234 | ||
235 | <refsect1> | |
236 | <title>Examples</title> | |
237 | ||
238 | <example> | |
239 | <title>Generate a unified kernel image, and calculate the expected TPM PCR 11 value</title> | |
240 | ||
048bcb9d ZJS |
241 | <programlisting>$ ukify --output=vmlinux.efi \ |
242 | --os-release=@os-release.txt \ | |
243 | --cmdline=@cmdline.txt \ | |
244 | --splash=splash.bmp \ | |
245 | --devicetree=devicetree.dtb \ | |
e069c57f JJ |
246 | --measure \ |
247 | vmlinux initrd.cpio | |
ca1092dc LP |
248 | 11:sha1=d775a7b4482450ac77e03ee19bda90bd792d6ec7 |
249 | 11:sha256=bc6170f9ce28eb051ab465cd62be8cf63985276766cf9faf527ffefb66f45651 | |
048bcb9d ZJS |
250 | 11:sha384=1cf67dff4757e61e5...7f49ad720be02fd07263e1f93061243aec599d1ee4b4 |
251 | 11:sha512=8e79acd3ddbbc8282...0c3e8ec0c714821032038f525f744960bcd082d937da | |
ca1092dc | 252 | </programlisting> |
048bcb9d ZJS |
253 | |
254 | <para><citerefentry><refentrytitle>ukify</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
255 | internally calls <command>systemd-measure</command>. The output with hashes is from | |
256 | <command>systemd-measure</command>.</para> | |
ca1092dc | 257 | </example> |
cdaaa62c LP |
258 | |
259 | <example> | |
048bcb9d | 260 | <title>Generate a private/public key pair, a unified kernel image, and a TPM PCR 11 signature for |
2deca517 | 261 | it, and embed the signature and the public key in the image</title> |
cdaaa62c | 262 | |
048bcb9d ZJS |
263 | <programlisting>$ openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out tpm2-pcr-private.pem |
264 | ..+.+++++++++......+.........+......+.......+....+.....+.+...+.......... | |
265 | $ openssl rsa -pubout -in tpm2-pcr-private.pem -out tpm2-pcr-public.pem | |
cdaaa62c LP |
266 | # systemd-measure sign \ |
267 | --linux=vmlinux \ | |
268 | --osrel=os-release.txt \ | |
269 | --cmdline=cmdline.txt \ | |
270 | --initrd=initrd.cpio \ | |
271 | --splash=splash.bmp \ | |
272 | --dtb=devicetree.dtb \ | |
2deca517 | 273 | --pcrpkey=tpm2-pcr-public.pem \ |
cdaaa62c LP |
274 | --bank=sha1 \ |
275 | --bank=sha256 \ | |
276 | --private-key=tpm2-pcr-private.pem \ | |
7a17e41d | 277 | --public-key=tpm2-pcr-public.pem >tpm2-pcr-signature.json |
048bcb9d ZJS |
278 | # ukify --output=vmlinuz.efi \ |
279 | --os-release=@os-release.txt \ | |
280 | --cmdline=@cmdline.txt \ | |
281 | --splash=splash.bmp \ | |
282 | --devicetree=devicetree.dtb \ | |
283 | --pcr-private-key=tpm2-pcr-private.pem \ | |
284 | --pcr-public-key=tpm2-pcr-public.pem \ | |
285 | --pcr-banks=sha1,sha256 \ | |
e069c57f | 286 | vmlinux initrd.cpio</programlisting> |
cdaaa62c LP |
287 | |
288 | <para>Later on, enroll the signed PCR policy on a LUKS volume:</para> | |
289 | ||
048bcb9d ZJS |
290 | <programlisting># systemd-cryptenroll --tpm2-device=auto \ |
291 | --tpm2-public-key=tpm2-pcr-public.pem \ | |
292 | --tpm2-signature=tpm2-pcr-signature.json \ | |
293 | /dev/sda5</programlisting> | |
cdaaa62c LP |
294 | |
295 | <para>And then unlock the device with the signature:</para> | |
296 | ||
fb8d67cd | 297 | <programlisting># systemd-cryptsetup attach \ |
048bcb9d ZJS |
298 | volume5 /dev/sda5 - \ |
299 | tpm2-device=auto,tpm2-signature=/path/to/tpm2-pcr-signature.json</programlisting> | |
2deca517 | 300 | |
048bcb9d | 301 | <para>Note that when the generated unified kernel image <filename>vmlinux.efi</filename> is booted, the |
2deca517 LP |
302 | signature and public key files will be placed at locations <command>systemd-cryptenroll</command> and |
303 | <command>systemd-cryptsetup</command> will look for anyway, and thus these paths do not actually need to | |
304 | be specified.</para> | |
cdaaa62c | 305 | </example> |
7eb51b8e LP |
306 | |
307 | <example> | |
308 | <title>Introduce a second public key, signing the same kernel PCR measurements, but only for the initrd boot phase</title> | |
309 | ||
310 | <para>This example extends the previous one, but we now introduce a second signing key that is only | |
311 | used to sign PCR policies restricted to the initrd boot phase. This can be used to lock down root | |
312 | volumes in a way that they can only be unlocked before the transition to the host system. Thus we have | |
313 | two classes of secrets or credentials: one that can be unlocked during the entire runtime, and the | |
314 | other that can only be used in the initrd.</para> | |
315 | ||
048bcb9d ZJS |
316 | <programlisting>$ openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out tpm2-pcr-private.pem |
317 | .+........+.+........+.......+...+...+........+....+......+..+.......... | |
318 | $ openssl rsa -pubout -in tpm2-pcr-private.pem -out tpm2-pcr-public.pem | |
319 | $ openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out tpm2-pcr-initrd-private.pem | |
320 | ..+.......++........+........+......+........+....+.....+.+..+.......... | |
321 | $ openssl rsa -pubout -in tpm2-pcr-initrd-private.pem -out tpm2-pcr-initrd-public.pem | |
322 | # ukify --output vmlinux-1.2.3.efi \ | |
323 | --os-release=@os-release.txt \ | |
324 | --cmdline=@cmdline.txt \ | |
7eb51b8e | 325 | --splash=splash.bmp \ |
048bcb9d ZJS |
326 | --devicetree=devicetree.dtb \ |
327 | --pcr-private-key=tpm2-pcr-private.pem \ | |
328 | --pcr-public-key=tpm2-pcr-public.pem \ | |
329 | --phases=enter-initrd,enter-initrd:leave-initrd,enter-initrd:leave-initrd:sysinit,enter-initrd:leave-initrd:sysinit:ready \ | |
330 | --pcr-banks=sha1,sha256 \ | |
331 | --pcr-private-key=tpm2-pcr-initrd-private.pem \ | |
332 | --pcr-public-key=tpm2-pcr-initrd-public.pem \ | |
333 | --phases=enter-initrd \ | |
334 | vmlinux-1.2.3 initrd.cpio \ | |
335 | --uname=1.2.3 | |
336 | + /usr/lib/systemd/systemd-measure sign --linux=vmlinux-1.2.3 \ | |
337 | --osrel=os-release.txt --cmdline=cmdline.txt --dtb=devicetree.dtb \ | |
338 | --splash=splash.bmp --initrd=initrd.cpio --bank=sha1 --bank=sha256 \ | |
339 | --private-key=tpm2-pcr-private.pem --public-key=tpm2-pcr-public.pem \ | |
340 | --phase=enter-initrd --phase=enter-initrd:leave-initrd \ | |
341 | --phase=enter-initrd:leave-initrd:sysinit \ | |
342 | --phase=enter-initrd:leave-initrd:sysinit:ready | |
343 | + /usr/lib/systemd/systemd-measure sign --linux=vmlinux-1.2.3 \ | |
344 | --osrel=os-release.txt --cmdline=cmdline.txt --dtb=devicetree.dtb \ | |
345 | --splash=splash.bmp --initrd=initrd.cpio --bank=sha1 --bank=sha256 \ | |
346 | --private-key=tpm2-pcr-initrd-private.pem \ | |
347 | --public-key=tpm2-pcr-initrd-public.pem \ | |
348 | --phase=enter-initrd | |
349 | Wrote unsigned vmlinux-1.2.3.efi | |
350 | </programlisting> | |
351 | ||
352 | <para><command>ukify</command> prints out both invocations of <command>systemd-measure</command> as | |
353 | informative output (the lines starting with <literal>+</literal>); this allows us to see how | |
354 | <command>systemd-measure</command> is called. It then merges the output of both invocations into the | |
355 | <literal>.pcrsig</literal> section. <command>systemd-measure</command> may also do this merge itself | |
356 | using the <option>--append=</option> option.</para> | |
357 | ||
358 | <para>Note that in this example the <literal>.pcrpkey</literal> PE section contains the key specified | |
359 | by the first <option>--pcr-private-key=</option> option, covering all boot phases. The | |
360 | <literal>.pcrpkey</literal> section is used in the default policies of | |
361 | <command>systemd-cryptenroll</command> and <command>systemd-creds</command>. To use the stricter policy | |
362 | bound to <filename>tpm-pcr-initrd-public.pem</filename>, specify <option>--tpm2-public-key=</option> on | |
363 | the command line of those tools.</para> | |
7eb51b8e | 364 | </example> |
ca1092dc LP |
365 | </refsect1> |
366 | ||
367 | <refsect1> | |
368 | <title>Exit status</title> | |
369 | ||
370 | <para>On success, 0 is returned, a non-zero failure code otherwise.</para> | |
371 | </refsect1> | |
372 | ||
373 | <refsect1> | |
374 | <title>See Also</title> | |
375 | <para> | |
376 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
377 | <citerefentry><refentrytitle>systemd-stub</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
e069c57f | 378 | <citerefentry><refentrytitle>ukify</refentrytitle><manvolnum>1</manvolnum></citerefentry>, |
cdaaa62c | 379 | <citerefentry><refentrytitle>systemd-creds</refentrytitle><manvolnum>1</manvolnum></citerefentry>, |
708d7524 | 380 | <citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
9e60dc0d | 381 | <citerefentry><refentrytitle>systemd-pcrphase.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> |
ca1092dc LP |
382 | </para> |
383 | </refsect1> | |
384 | ||
385 | </refentry> |