X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=man%2Fsystemd.exec.xml;h=2f75915c2076d6aa4c31bb65d2020422c99b448e;hp=784b48fff434e628d621c8125cae8369feec6018;hb=bf3f1271e2cc0c22b11c8a805a997578dabe9191;hpb=907afa0682c8d6f00937b11b04be6b8a26a3cd41
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index 784b48fff..2f75915c2 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -103,7 +103,7 @@
directory path. Sets the root
directory for executed processes, with
the
- chroot2
+ chroot2
system call. If this is used, it must
be ensured that the process and all
its auxiliary files are available in
@@ -304,7 +304,7 @@
See
- environ7
+ environ7
for details about environment variables.
@@ -340,9 +340,14 @@
The files listed with this
directive will be read shortly before
- the process is executed. Settings from
- these files override settings made
- with
+ the process is executed (more
+ specifically, after all
+ processes from a previous unit state
+ terminated. This means you can
+ generate these files in one unit
+ state, and read it with this option in
+ the next). Settings from these files
+ override settings made with
Environment=. If
the same variable is set twice from
these files, the files will be read in
@@ -438,12 +443,12 @@
for other processes to release the
terminal.
connects standard output to the
- syslog3
+ syslog3
system syslog
service.
connects it with the kernel log buffer
which is accessible via
- dmesg1.
+ dmesg1.
connects it with the journal which is
accessible via
journalctl1
@@ -563,7 +568,7 @@
,
or
. See
- syslog3
+ syslog3
for details. This option is only
useful when
StandardOutput= or
@@ -585,7 +590,7 @@
,
,
. See
- syslog3
+ syslog3
for details. This option is only
useful when
StandardOutput= or
@@ -682,35 +687,10 @@
User= setting. If
not set, no PAM session will be opened
for the executed processes. See
- pam8
+ pam8
for details.
-
- TCPWrapName=
- If this is a
- socket-activated service, this sets the
- tcpwrap service name to check the
- permission for the current connection
- with. This is only useful in
- conjunction with socket-activated
- services, and stream sockets (TCP) in
- particular. It has no effect on other
- socket types (e.g. datagram/UDP) and
- on processes unrelated to socket-based
- activation. If the tcpwrap
- verification fails, daemon start-up
- will fail and the connection is
- terminated. See
- tcpd8
- for details. Note that this option may
- be used to do access control checks
- only. Shell commands and commands
- described in
- hosts_options5
- are not supported.
-
-
CapabilityBoundingSet=
@@ -718,7 +698,7 @@
capabilities to include in the
capability bounding set for the
executed process. See
- capabilities7
+ capabilities7
for details. Takes a whitespace-separated
list of capability names as read by
cap_from_name3,
@@ -759,7 +739,7 @@
SecureBits=Controls the secure
bits set for the executed process. See
- capabilities7
+ capabilities7
for details. Takes a list of strings:
,
,
@@ -777,14 +757,14 @@
Capabilities=Controls the
- capabilities7
+ capabilities7
set for the executed process. Take a
capability string describing the
effective, permitted and inherited
capability sets as documented in
cap_from_text3.
Note that these capability sets are
- usually influenced by the capabilities
+ usually influenced (and filtered) by the capabilities
attached to the executed file. Due to
that
CapabilityBoundingSet=
@@ -797,8 +777,8 @@
ReadOnlyDirectories=InaccessibleDirectories=
- Sets up a new
- file system namespace for executed
+ Sets up a new file
+ system namespace for executed
processes. These options may be used
to limit access a process might have
to the main file system
@@ -819,16 +799,14 @@
processes inside the namespace. Note
that restricting access with these
options does not extend to submounts
- of a directory. You must list
- submounts separately in these settings
- to ensure the same limited
- access. These options may be specified
+ of a directory that are created later
+ on. These options may be specified
more than once in which case all
directories listed will have limited
access from within the namespace. If
the empty string is assigned to this
- option, the specific list is reset, and
- all prior assignments have no
+ option, the specific list is reset,
+ and all prior assignments have no
effect.Paths in
ReadOnlyDirectories=
@@ -865,7 +843,7 @@
processes via
/tmp or
/var/tmp
- impossible. If this is enabled all
+ impossible. If this is enabled, all
temporary files created by a service
in these directories will be removed
after the service is stopped. Defaults
@@ -954,6 +932,67 @@
accessible).
+
+ ProtectSystem=
+
+ Takes a boolean
+ argument or
+ full. If true,
+ mounts the /usr
+ directory read-only for processes
+ invoked by this unit. If set to
+ full, the
+ /etc directory is mounted
+ read-only, too. This setting ensures
+ that any modification of the vendor
+ supplied operating system (and
+ optionally its configuration) is
+ prohibited for the service. It is
+ recommended to enable this setting for
+ all long-running services, unless they
+ are involved with system updates or
+ need to modify the operating system in
+ other ways. Note however that
+ processes retaining the CAP_SYS_ADMIN
+ capability can undo the effect of this
+ setting. This setting is hence
+ particularly useful for daemons which
+ have this capability removed, for
+ example with
+ CapabilityBoundingSet=. Defaults
+ to off.
+
+
+
+ ProtectHome=
+
+ Takes a boolean
+ argument or
+ read-only. If true,
+ the directories
+ /home and
+ /run/user are
+ made inaccessible and empty for
+ processes invoked by this unit. If set
+ to read-only, the
+ two directores are made read-only
+ instead. It is recommended to enable
+ this setting for all long-running
+ services (in particular network-facing
+ ones), to ensure they cannot get access
+ to private user data, unless the
+ services actually require access to
+ the user's private data. Note however
+ that processes retaining the
+ CAP_SYS_ADMIN capability can undo the
+ effect of this setting. This setting
+ is hence particularly useful for
+ daemons which have this capability
+ removed, for example with
+ CapabilityBoundingSet=. Defaults
+ to off.
+
+
MountFlags=
@@ -962,13 +1001,45 @@
,
or
, which
- control whether the file system
- namespace set up for this unit's
- processes will receive or propagate
- new mounts. See
+ control whether mounts in the file
+ system namespace set up for this
+ unit's processes will receive or
+ propagate mounts or unmounts. See
mount2
- for details. Default to
- .
+ for details. Defaults to
+ . Use
+ to ensure that
+ mounts and unmounts are propagated
+ from the host to the container and
+ vice versa. Use
+ to run processes so that none of their
+ mounts and unmounts will propagate to
+ the host. Use
+ to also ensure that no mounts and
+ unmounts from the host will propagate
+ into the unit processes'
+ namespace. Note that
+ means that file
+ systems mounted on the host might stay
+ mounted continously in the unit's
+ namespace, and thus keep the device
+ busy. Note that the file system
+ namespace related options
+ (PrivateTmp=,
+ PrivateDevices=,
+ ReadOnlySystem=,
+ ProtectedHome=,
+ ReadOnlyDirectories=,
+ InaccessibleDirectories=
+ and
+ ReadWriteDirectories=)
+ require that mount and unmount
+ propagation from the unit's file
+ system namespace is disabled, and
+ hence downgrade
+ to
+ .
+
@@ -1012,7 +1083,7 @@
AppArmorProfile=
- Take a profile name as argument.
+ Takes a profile name as argument.
The process executed by the unit will switch to
this profile when started. Profiles must already
be loaded in the kernel, or the unit will fail.
@@ -1194,22 +1265,22 @@
(which creates connected AF_UNIX
sockets only) are unaffected. Note
that this option has no effect on
- 32bit x86 and is ignored (but works
+ 32-bit x86 and is ignored (but works
correctly on x86-64). If running in user
mode and this option is used,
NoNewPrivileges=yes
- is implied. By default no
+ is implied. By default, no
restriction applies, all address
families are accessible to
processes. If assigned the empty
- string any previous list changes are
+ string, any previous list changes are
undone.Use this option to limit
exposure of processes to remote
systems, in particular via exotic
network protocols. Note that in most
- cases the local
+ cases, the local
AF_UNIX address
family should be included in the
configured whitelist as it is
@@ -1229,8 +1300,8 @@
processes. Takes one of
x86 and
x86-64. This is
- useful when running 32bit services on
- a 64bit host system. If not specified
+ useful when running 32-bit services on
+ a 64-bit host system. If not specified,
the personality is left unmodified and
thus reflects the personality of the
host system's
@@ -1242,14 +1313,14 @@
RuntimeDirectoryMode=Takes a list of
- directory names. If set one or more
+ directory names. If set, one or more
directories by the specified names
will be created below
/run (for system
services) or below
$XDG_RUNTIME_DIR
(for user services) when the unit is
- started and removed when the unit is
+ started, and removed when the unit is
stopped. The directories will have the
access mode specified in
RuntimeDirectoryMode=,
@@ -1265,7 +1336,7 @@
/, i.e. must refer
to simple directories to create or
remove. This is particularly useful
- for unpriviliges daemons that cannot
+ for unprivileged daemons that cannot
create runtime directories in
/run due to lack
of privileges, and to make sure the
@@ -1401,7 +1472,7 @@
or
StandardError=tty).
See
- termcap5.
+ termcap5.
@@ -1417,7 +1488,7 @@
systemd.setenv= (see
systemd1). Additional
variables may also be set through PAM,
- c.f. pam_env8.
+ cf. pam_env8.
@@ -1435,7 +1506,7 @@
systemd.resource-control5,
systemd.directives7,
tmpfiles.d5,
- exec3
+ exec3