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systemd/units/systemd-udevd.service.in

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license: LGPL-2.1+ -> LGPL-2.1-or-later
2020-11-09 12:23:58 +08:00
# SPDX-License-Identifier: LGPL-2.1-or-later
Add SPDX license headers to unit files
2017-11-19 00:35:03 +08:00
#
units: introduce new Documentation= field and make use of it everywhere This should help making the boot process a bit easier to explore and understand for the administrator. The simple idea is that "systemctl status" now shows a link to documentation alongside the other status and decriptionary information of a service. This patch adds the necessary fields to all our shipped units if we have proper documentation for them.
2012-05-21 21:12:18 +08:00
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
add systemd service files
2010-06-25 07:31:57 +08:00
[Unit]
units: uppercase the description https://github.com/systemd/systemd/pull/15982#pullrequestreview-422536495
2020-06-02 20:14:20 +08:00
Description=Rule-based Manager for Device Events and Files
man: properly document .socket units in man page
2012-06-27 07:06:35 +08:00
Documentation=man:systemd-udevd.service(8) man:udev(7)
units: order all udev services before sysinit.target, too Not that it would matter much, but let's make things a bit more systematic: early boot services shall order themselves before sysinit.target, and nothing else.
2013-03-26 04:22:52 +08:00
DefaultDependencies=no
units: order service(s) before udevd, not udev-trigger (coldplug) Since hotplugs happen as soon as udevd is started, there is not much sense in giving udev-trigger an After= dependency on any service. The device could be hotplugged before coldplug starts. This is intended to avoid the race window where we create the hwdb with the wrong selinux context (then fix it up afterwards). https://github.com/systemd/systemd/issues/3458#issuecomment-322444107
2017-08-15 21:22:44 +08:00
After=systemd-sysusers.service systemd-hwdb-update.service
static-nodes: move creation of static nodes from udevd to tmpfiles As of kmod v14, it is possible to export the static node information from /lib/modules/`uname -r`/modules.devname in tmpfiles.d(5) format. Use this functionality to let systemd-tmpfilesd create the static device nodes at boot, and drop the functionality from systemd-udevd. As an effect of this we can move from systemd-udevd to systemd-tmpfiles-setup-dev: * the conditional CAP_MKNOD (replaced by checking if /sys is mounted rw) * ordering before local-fs-pre.target (see 89d09e1b5c65a2d97840f682e0932c8bb499f166)
2013-06-15 04:56:39 +08:00
Before=sysinit.target
ConditionPathIsReadWrite=/sys
add systemd service files
2010-06-25 07:31:57 +08:00
[Service]
units: add ProtectClock=yes Add `ProtectClock=yes` to systemd units. Since it implies certain `DeviceAllow=` rules, make sure that the units have `DeviceAllow=` rules so they are still able to access other devices. Exclude timesyncd and timedated.
2020-04-03 02:18:11 +08:00
DeviceAllow=block-* rwm
DeviceAllow=char-* rwm
add systemd service files
2010-06-25 07:31:57 +08:00
Type=notify
unit: update comment about OOM score Follow-up for 6b2229c6c60d0486f5eb9ed3088f9c780d7c0233.
2020-11-20 16:16:44 +08:00
# Note that udev will reset the value internally for its workers
systemd: add OOMScoreAdjust=-1000
2011-04-14 20:44:21 +08:00
OOMScoreAdjust=-1000
units: Rename systemd-udev.service to systemd-udevd.service This naming convention is more inline with other systemd daemon unit names (systemd-logind.service, systemd-localed.service etc) The companion .socket units have also been renamed, however the -trigger and -settle units keep their current name as these are not directly related to daemon process itself.
2012-07-03 03:35:14 +08:00
Sockets=systemd-udevd-control.socket systemd-udevd-kernel.socket
units: automatically respawn the core services
2012-06-28 18:13:52 +08:00
Restart=always
units: don't enforce a holdoff time for journald, logind, udevd These services should be restarted as quickly as possible if they fail, and the extra safety net of the holdoff time is not necessary.
2012-07-18 08:31:52 +08:00
RestartSec=0
udev: install udevd as /usr/lib/systemd/systemd-udevd
2012-04-17 05:32:22 +08:00
ExecStart=@rootlibexecdir@/systemd-udevd
units: drop full paths for utilities in $PATH This makes things a bit simpler and the build a bit faster, because we don't have to rewrite files to do the trivial substitution. @rootbindir@ is always in our internal $PATH that we use for non-absolute paths, so there should be no functional change.
2019-12-18 16:14:57 +08:00
ExecReload=udevadm control --reload --timeout 0
units: set KillMode=mixed for our daemons that fork worker processes The daemons should really have the time to kill the workers first, before systemd does it, hence use KillMode=mixed for these daemons. https://bugs.freedesktop.org/show_bug.cgi?id=90051
2015-04-24 22:12:28 +08:00
KillMode=mixed
udev: bump TasksMax to inifinity (#3593) udevd already limits its number of workers/children: the max number is actually twice the number of CPUs the system is using. (The limit can also be raised with udev.children-max= kernel command line option BTW). On some servers, this limit can easily exceed the maximum number of tasks that systemd put on all services, which is 512 by default. Since udevd has already its limitation logic, simply disable the static limitation done by TasksMax.
2016-06-24 04:31:01 +08:00
TasksMax=infinity
units: switch udev service to use PrivateMounts=yes Given that PrivateMounts=yes is the "successor" to MountFlags=slave in unit files, let's make use of it for udevd.
2018-06-01 17:24:40 +08:00
PrivateMounts=yes
units: add ProtectClock=yes Add `ProtectClock=yes` to systemd units. Since it implies certain `DeviceAllow=` rules, make sure that the units have `DeviceAllow=` rules so they are still able to access other devices. Exclude timesyncd and timedated.
2020-04-03 02:18:11 +08:00
ProtectClock=yes
units: enable ProtectHostname=yes
2019-02-19 06:30:12 +08:00
ProtectHostname=yes
units: further lock down our long-running services Let's make this an excercise in dogfooding: let's turn on more security features for all our long-running services. Specifically: - Turn on RestrictRealtime=yes for all of them - Turn on ProtectKernelTunables=yes and ProtectControlGroups=yes for most of them - Turn on RestrictAddressFamilies= for all of them, but different sets of address families for each Also, always order settings in the unit files, that the various sandboxing features are close together. Add a couple of missing, older settings for a numbre of unit files. Note that this change turns off AF_INET/AF_INET6 from udevd, thus effectively turning of networking from udev rule commands. Since this might break stuff (that is already broken I'd argue) this is documented in NEWS.
2016-08-26 19:23:27 +08:00
MemoryDenyWriteExecute=yes
units: systemd-udevd: add AF_INET and AF_INET6 to RestrictAddressFamilies= (#4296) The udev builtin command `net_setup_link` requires AF_INET and AF_INET6. Fixes #4293.
2016-10-06 21:40:53 +08:00
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
units: turn on RestrictSUIDSGID= in most of our long-running daemons
2019-03-21 02:52:20 +08:00
RestrictRealtime=yes
RestrictSUIDSGID=yes
units: switch from system call blacklist to whitelist This is generally the safer approach, and is what container managers (including nspawn) do, hence let's move to this too for our own services. This is particularly useful as this this means the new @system-service system call filter group will get serious real-life testing quickly. This also switches from firing SIGSYS on unexpected syscalls to returning EPERM. This would have probably been a better default anyway, but it's hard to change that these days. When whitelisting system calls SIGSYS is highly problematic as system calls that are newly introduced to Linux become minefields for services otherwise. Note that this enables a system call filter for udev for the first time, and will block @clock, @mount and @swap from it. Some downstream distributions might want to revert this locally if they want to permit unsafe operations on udev rules, but in general this shiuld be mostly safe, as we already set MountFlags=shared for udevd, hence at least @mount won't change anything.
2018-04-19 17:04:17 +08:00
SystemCallFilter=@system-service @module @raw-io
SystemCallErrorNumber=EPERM
units: set SystemCallArchitectures=native on all our long-running services
2017-02-09 05:32:37 +08:00
SystemCallArchitectures=native
units: set LockPersonality= for all our long-running services (#6819) Let's lock things down. Also, using it is the only way how to properly test this to the fullest extent.
2017-09-15 01:45:40 +08:00
LockPersonality=yes
units: prohibit all IP traffic on all our long-running services (#6921) Let's lock things down further.
2017-10-04 20:16:28 +08:00
IPAddressDeny=any
meson: allow WatchdogSec= in services to be configured As discussed on systemd-devel [1], in Fedora we get lots of abrt reports about the watchdog firing [2], but 100% of them seem to be caused by resource starvation in the machine, and never actual deadlocks in the services being monitored. Killing the services not only does not improve anything, but it makes the resource starvation worse, because the service needs cycles to restart, and coredump processing is also fairly expensive. This adds a configuration option to allow the value to be changed. If the setting is not set, there is no change. My plan is to set it to some ridiculusly high value, maybe 1h, to catch cases where a service is actually hanging. [1] https://lists.freedesktop.org/archives/systemd-devel/2019-October/043618.html [2] https://bugzilla.redhat.com/show_bug.cgi?id=1300212
2019-10-25 18:17:24 +08:00
@SERVICE_WATCHDOG@
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