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man: Add description for ProtectKernelLogs=

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This commit is contained in:
Kevin Kuehler 2019-11-10 21:27:29 -08:00
parent 97d05f3b70
commit d916e35b9f
1 changed files with 23 additions and 7 deletions
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30
man/systemd.exec.xml
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@ -402,11 +402,11 @@ CapabilityBoundingSet=~CAP_B CAP_C</programlisting>
<varname>SystemCallFilter=</varname>, <varname>SystemCallArchitectures=</varname>,
<varname>RestrictAddressFamilies=</varname>, <varname>RestrictNamespaces=</varname>,
<varname>PrivateDevices=</varname>, <varname>ProtectKernelTunables=</varname>,
<varname>ProtectKernelModules=</varname>, <varname>MemoryDenyWriteExecute=</varname>,
<varname>RestrictRealtime=</varname>, <varname>RestrictSUIDSGID=</varname>,
<varname>DynamicUser=</varname> or <varname>LockPersonality=</varname> are specified. Note that even
if this setting is overridden by them, <command>systemctl show</command> shows the original value of
this setting. Also see <ulink
<varname>ProtectKernelModules=</varname>, <varname>ProtectKernelLogs=</varname>,
<varname>MemoryDenyWriteExecute=</varname>, <varname>RestrictRealtime=</varname>,
<varname>RestrictSUIDSGID=</varname>, <varname>DynamicUser=</varname> or <varname>LockPersonality=</varname>
are specified. Note that even if this setting is overridden by them, <command>systemctl show</command> shows the
original value of this setting. Also see <ulink
url="https://www.kernel.org/doc/html/latest/userspace-api/no_new_privs.html">No New Privileges
Flag</ulink>.</para></listitem>
</varlistentry>
@ -1321,6 +1321,22 @@ BindReadOnlyPaths=/var/lib/systemd</programlisting>
<xi:include href="system-only.xml" xpointer="singular"/></listitem>
</varlistentry>
<varlistentry>
<term><varname>ProtectKernelLogs=</varname></term>
<listitem><para>Takes a boolean argument. If true, access to the kernel log ring buffer will be denied. It is
recommended to turn this on for most services that do not need to read from or write to the kernel log ring
buffer. Enabling this option removes <constant>CAP_SYSLOG</constant> from the capability bounding set for this
unit, and installs a system call filter to block the
<citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>2</manvolnum></citerefentry>
system call (not to be confused with the libc API
<citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>
for userspace logging). The kernel exposes its log buffer to userspace via <filename>/dev/kmsg</filename> and
<filename>/proc/kmsg</filename>. If enabled, these are made inaccessible to all the processes in the unit.</para>
<xi:include href="system-only.xml" xpointer="singular"/></listitem>
</varlistentry>
<varlistentry>
<term><varname>ProtectControlGroups=</varname></term>
@ -1772,8 +1788,8 @@ SystemCallErrorNumber=EPERM</programlisting>
mappings. Specifically these are the options <varname>PrivateTmp=</varname>,
<varname>PrivateDevices=</varname>, <varname>ProtectSystem=</varname>, <varname>ProtectHome=</varname>,
<varname>ProtectKernelTunables=</varname>, <varname>ProtectControlGroups=</varname>,
<varname>ReadOnlyPaths=</varname>, <varname>InaccessiblePaths=</varname> and
<varname>ReadWritePaths=</varname>.</para></listitem>
<varname>ProtectKernelLogs=</varname>, <varname>ReadOnlyPaths=</varname>,
<varname>InaccessiblePaths=</varname> and <varname>ReadWritePaths=</varname>.</para></listitem>
</varlistentry>
<varlistentry>