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From 128ef85392f68fa32650deab12d6cd2e01ad52cf Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Tue, 10 Nov 2015 16:52:52 +0100
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Subject: [PATCH] core: accept time units for time-based resource limits
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Let's make sure "LimitCPU=30min" can be parsed properly, following the
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usual logic how we parse time values. Similar for LimitRTTIME=.
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While we are at it, extend a bit on the man page section about resource
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limits.
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Fixes: #1772
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Cherry-picked from: a4c1800284e3546bbfab2dc19eb59bcb91c4a2ca
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Related: #1351415
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---
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 man/systemd.exec.xml                  |  86 ++++++++++++++++++++++-------
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 src/core/load-fragment-gperf.gperf.m4 |   4 +-
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 src/core/load-fragment.c              | 101 ++++++++++++++++++++++++++++++++++
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 src/core/load-fragment.h              |   2 +
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 src/test/test-unit-file.c             |  61 ++++++++++++++++++++
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 5 files changed, 231 insertions(+), 23 deletions(-)
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diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
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index 25aea16..cfdcc3d 100644
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--- a/man/systemd.exec.xml
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+++ b/man/systemd.exec.xml
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@@ -559,90 +559,133 @@
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         of various resources for executed processes. See
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         <citerefentry><refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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         for details. Use the string <varname>infinity</varname> to
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-        configure no limit on a specific resource. The multiplicative suffixes
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-        K (=1024), M (=1024*1024) and so on for G, T, P and E may be used for
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-        resource limits measured in bytes (e.g. LimitAS=16G).</para></listitem>
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+        configure no limit on a specific resource. The multiplicative
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+        suffixes K (=1024), M (=1024*1024) and so on for G, T, P and E
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+        may be used for resource limits measured in bytes
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+        (e.g. LimitAS=16G). For the limits referring to time values,
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+        the usual time units ms, s, min, h and so on may be used (see
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+        <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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+        for details). Note that if no time unit is specified for
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+        <varname>LimitCPU=</varname> the default unit of seconds is
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+        implied, while for <varname>LimitRTTIME=</varname> the default
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+        unit of microseconds is implied. Also, note that the effective
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+        granularity of the limits might influence their
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+        enforcement. For example, time limits specified for
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+        <varname>LimitCPU=</varname> will be rounded up implicitly to
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+        multiples of 1s.</para>
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+
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+        <para>Note that most process resource limits configured with
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+        these options are per-process, and processes may fork in order
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+        to acquire a new set of resources that are accounted
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+        independently of the original process, and may thus escape
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+        limits set. Also note that <varname>LimitRSS=</varname> is not
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+        implemented on Linux, and setting it has no effect. Often it
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+        is advisable to prefer the resource controls listed in
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+        <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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+        over these per-process limits, as they apply to services as a
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+        whole, may be altered dynamically at runtime, and are
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+        generally more expressive. For example,
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+        <varname>MemoryLimit=</varname> is a more powerful (and
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+        working) replacement for <varname>LimitRSS=</varname>.</para>
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           <title>Limit directives and their equivalent with ulimit</title>
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-          <tgroup cols='2'>
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+          <tgroup cols='3'>
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             <colspec colname='directive' />
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             <colspec colname='equivalent' />
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+            <colspec colname='unit' />
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               <row>
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                 <entry>Directive</entry>
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                 <entry>ulimit equivalent</entry>
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+                <entry>Unit</entry>
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               </row>
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               <row>
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-                <entry>LimitCPU</entry>
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+                <entry>LimitCPU=</entry>
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                 <entry>ulimit -t</entry>
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+                <entry>Seconds</entry>
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               </row>
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               <row>
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-                <entry>LimitFSIZE</entry>
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+                <entry>LimitFSIZE=</entry>
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                 <entry>ulimit -f</entry>
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+                <entry>Bytes</entry>
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               </row>
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               <row>
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-                <entry>LimitDATA</entry>
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+                <entry>LimitDATA=</entry>
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                 <entry>ulimit -d</entry>
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+                <entry>Bytes</entry>
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               </row>
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               <row>
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-                <entry>LimitSTACK</entry>
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+                <entry>LimitSTACK=</entry>
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                 <entry>ulimit -s</entry>
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+                <entry>Bytes</entry>
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               </row>
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               <row>
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-                <entry>LimitCORE</entry>
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+                <entry>LimitCORE=</entry>
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                 <entry>ulimit -c</entry>
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+                <entry>Bytes</entry>
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               </row>
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               <row>
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-                <entry>LimitRSS</entry>
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+                <entry>LimitRSS=</entry>
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                 <entry>ulimit -m</entry>
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+                <entry>Bytes</entry>
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               </row>
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               <row>
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-                <entry>LimitNOFILE</entry>
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+                <entry>LimitNOFILE=</entry>
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                 <entry>ulimit -n</entry>
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+                <entry>Number of File Descriptors</entry>
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               </row>
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               <row>
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-                <entry>LimitAS</entry>
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+                <entry>LimitAS=</entry>
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                 <entry>ulimit -v</entry>
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+                <entry>Bytes</entry>
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               </row>
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               <row>
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-                <entry>LimitNPROC</entry>
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+                <entry>LimitNPROC=</entry>
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                 <entry>ulimit -u</entry>
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+                <entry>Number of Processes</entry>
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               </row>
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               <row>
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-                <entry>LimitMEMLOCK</entry>
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+                <entry>LimitMEMLOCK=</entry>
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                 <entry>ulimit -l</entry>
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+                <entry>Bytes</entry>
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               </row>
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               <row>
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-                <entry>LimitLOCKS</entry>
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+                <entry>LimitLOCKS=</entry>
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                 <entry>ulimit -x</entry>
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+                <entry>Number of Locks</entry>
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               </row>
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               <row>
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-                <entry>LimitSIGPENDING</entry>
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+                <entry>LimitSIGPENDING=</entry>
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                 <entry>ulimit -i</entry>
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+                <entry>Number of Queued Signals</entry>
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               </row>
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               <row>
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-                <entry>LimitMSGQUEUE</entry>
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+                <entry>LimitMSGQUEUE=</entry>
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                 <entry>ulimit -q</entry>
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+                <entry>Bytes</entry>
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               </row>
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               <row>
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-                <entry>LimitNICE</entry>
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+                <entry>LimitNICE=</entry>
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                 <entry>ulimit -e</entry>
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+                <entry>Nice Level</entry>
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               </row>
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               <row>
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-                <entry>LimitRTPRIO</entry>
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+                <entry>LimitRTPRIO=</entry>
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                 <entry>ulimit -r</entry>
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+                <entry>Realtime Priority</entry>
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               </row>
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               <row>
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-                <entry>LimitRTTIME</entry>
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+                <entry>LimitRTTIME=</entry>
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                 <entry>No equivalent</entry>
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+                <entry>Microseconds</entry>
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               </row>
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           </tgroup>
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-        
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+        </listitem>
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       </varlistentry>
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       <varlistentry>
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@@ -1266,6 +1309,7 @@
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         <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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         <citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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         <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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+        <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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         <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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         <citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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         <citerefentry project='man-pages'><refentrytitle>exec</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
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index c3461a0..ce1397c 100644
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--- a/src/core/load-fragment-gperf.gperf.m4
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+++ b/src/core/load-fragment-gperf.gperf.m4
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@@ -58,7 +58,7 @@ $1.RestrictAddressFamilies,      config_parse_address_families,      0,
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 $1.SystemCallArchitectures,      config_parse_warn_compat,           DISABLED_CONFIGURATION,        0
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 $1.SystemCallErrorNumber,        config_parse_warn_compat,           DISABLED_CONFIGURATION,        0
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 $1.RestrictAddressFamilies,      config_parse_warn_compat,           DISABLED_CONFIGURATION,        0')
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-$1.LimitCPU,                     config_parse_limit,                 RLIMIT_CPU,                    offsetof($1, exec_context.rlimit)
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+$1.LimitCPU,                     config_parse_sec_limit,             RLIMIT_CPU,                    offsetof($1, exec_context.rlimit)
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 $1.LimitFSIZE,                   config_parse_bytes_limit,           RLIMIT_FSIZE,                  offsetof($1, exec_context.rlimit)
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 $1.LimitDATA,                    config_parse_bytes_limit,           RLIMIT_DATA,                   offsetof($1, exec_context.rlimit)
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 $1.LimitSTACK,                   config_parse_bytes_limit,           RLIMIT_STACK,                  offsetof($1, exec_context.rlimit)
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@@ -73,7 +73,7 @@ $1.LimitSIGPENDING,              config_parse_limit,                 RLIMIT_SIGP
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 $1.LimitMSGQUEUE,                config_parse_bytes_limit,           RLIMIT_MSGQUEUE,               offsetof($1, exec_context.rlimit)
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 $1.LimitNICE,                    config_parse_limit,                 RLIMIT_NICE,                   offsetof($1, exec_context.rlimit)
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 $1.LimitRTPRIO,                  config_parse_limit,                 RLIMIT_RTPRIO,                 offsetof($1, exec_context.rlimit)
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-$1.LimitRTTIME,                  config_parse_limit,                 RLIMIT_RTTIME,                 offsetof($1, exec_context.rlimit)
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+$1.LimitRTTIME,                  config_parse_usec_limit,            RLIMIT_RTTIME,                 offsetof($1, exec_context.rlimit)
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 $1.ReadWriteDirectories,         config_parse_namespace_path_strv,   0,                             offsetof($1, exec_context.read_write_dirs)
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 $1.ReadOnlyDirectories,          config_parse_namespace_path_strv,   0,                             offsetof($1, exec_context.read_only_dirs)
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 $1.InaccessibleDirectories,      config_parse_namespace_path_strv,   0,                             offsetof($1, exec_context.inaccessible_dirs)
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diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
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index dbb45b2..8afe9d7 100644
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--- a/src/core/load-fragment.c
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+++ b/src/core/load-fragment.c
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@@ -1162,6 +1162,107 @@ int config_parse_bytes_limit(const char *unit,
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         return 0;
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 }
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+int config_parse_sec_limit(
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+                const char *unit,
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+                const char *filename,
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+                unsigned line,
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+                const char *section,
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+                unsigned section_line,
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+                const char *lvalue,
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+                int ltype,
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+                const char *rvalue,
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+                void *data,
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+                void *userdata) {
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+
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+        struct rlimit **rl = data;
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+        rlim_t seconds;
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+        int r;
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+
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+        assert(filename);
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+        assert(lvalue);
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+        assert(rvalue);
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+        assert(data);
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+
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+        rl += ltype;
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+
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+        if (streq(rvalue, "infinity"))
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+                seconds = RLIM_INFINITY;
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+        else {
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+                usec_t t;
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+
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+                r = parse_sec(rvalue, &t);
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+                if (r < 0) {
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+                        log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue);
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+                        return 0;
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+                }
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+
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+                if (t == USEC_INFINITY)
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+                        seconds = RLIM_INFINITY;
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+                else
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+                        seconds = (rlim_t) (DIV_ROUND_UP(t, USEC_PER_SEC));
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+        }
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+
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+        if (!*rl) {
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+                *rl = new(struct rlimit, 1);
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+                if (!*rl)
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+                        return log_oom();
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+        }
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+
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+        (*rl)->rlim_cur = (*rl)->rlim_max = seconds;
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+        return 0;
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+}
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+
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+
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+int config_parse_usec_limit(
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+                const char *unit,
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+                const char *filename,
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+                unsigned line,
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+                const char *section,
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+                unsigned section_line,
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+                const char *lvalue,
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+                int ltype,
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+                const char *rvalue,
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+                void *data,
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+                void *userdata) {
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+
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+        struct rlimit **rl = data;
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+        rlim_t useconds;
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+        int r;
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+
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+        assert(filename);
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+        assert(lvalue);
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+        assert(rvalue);
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+        assert(data);
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+
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+        rl += ltype;
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+
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+        if (streq(rvalue, "infinity"))
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+                useconds = RLIM_INFINITY;
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+        else {
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+                usec_t t;
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+
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+                r = parse_time(rvalue, &t, 1);
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+                if (r < 0) {
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+                        log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue);
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+                        return 0;
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+                }
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+
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+                if (t == USEC_INFINITY)
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+                        useconds = RLIM_INFINITY;
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+                else
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+                        useconds = (rlim_t) t;
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+        }
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+
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+        if (!*rl) {
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+                *rl = new(struct rlimit, 1);
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+                if (!*rl)
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+                        return log_oom();
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+        }
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+
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+        (*rl)->rlim_cur = (*rl)->rlim_max = useconds;
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+        return 0;
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+}
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+
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 #ifdef HAVE_SYSV_COMPAT
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 int config_parse_sysv_priority(const char *unit,
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                                const char *filename,
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diff --git a/src/core/load-fragment.h b/src/core/load-fragment.h
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index 2d509d0..359794d 100644
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--- a/src/core/load-fragment.h
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+++ b/src/core/load-fragment.h
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@@ -57,6 +57,8 @@ int config_parse_exec_secure_bits(const char *unit, const char *filename, unsign
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 int config_parse_bounding_set(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_limit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_bytes_limit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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+int config_parse_sec_limit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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+int config_parse_usec_limit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_sysv_priority(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_kill_signal(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_exec_mount_flags(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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diff --git a/src/test/test-unit-file.c b/src/test/test-unit-file.c
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index 5500983..d151737 100644
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--- a/src/test/test-unit-file.c
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+++ b/src/test/test-unit-file.c
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@@ -545,6 +545,66 @@ static void test_install_printf(void) {
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         expect(i4, "%U", "0");
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 }
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+
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+static void test_config_parse_rlimit(void) {
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+        struct rlimit * rl[_RLIMIT_MAX] = {};
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+
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+        assert_se(config_parse_limit(NULL, "fake", 1, "section", 1, "LimitNOFILE", RLIMIT_NOFILE, "55", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_NOFILE]);
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+        assert_se(rl[RLIMIT_NOFILE]->rlim_cur == 55);
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+        assert_se(rl[RLIMIT_NOFILE]->rlim_cur == rl[RLIMIT_NOFILE]->rlim_max);
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+
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+        assert_se(config_parse_limit(NULL, "fake", 1, "section", 1, "LimitNOFILE", RLIMIT_NOFILE, "infinity", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_NOFILE]);
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+        assert_se(rl[RLIMIT_NOFILE]->rlim_cur == RLIM_INFINITY);
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+        assert_se(rl[RLIMIT_NOFILE]->rlim_cur == rl[RLIMIT_NOFILE]->rlim_max);
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+
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+        rl[RLIMIT_NOFILE] = free(rl[RLIMIT_NOFILE]);
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+        assert_se(config_parse_sec_limit(NULL, "fake", 1, "section", 1, "LimitCPU", RLIMIT_CPU, "56", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_CPU]);
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+        assert_se(rl[RLIMIT_CPU]->rlim_cur == 56);
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+        assert_se(rl[RLIMIT_CPU]->rlim_cur == rl[RLIMIT_CPU]->rlim_max);
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+
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+        assert_se(config_parse_sec_limit(NULL, "fake", 1, "section", 1, "LimitCPU", RLIMIT_CPU, "57s", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_CPU]);
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+        assert_se(rl[RLIMIT_CPU]->rlim_cur == 57);
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+        assert_se(rl[RLIMIT_CPU]->rlim_cur == rl[RLIMIT_CPU]->rlim_max);
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+
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+        assert_se(config_parse_sec_limit(NULL, "fake", 1, "section", 1, "LimitCPU", RLIMIT_CPU, "infinity", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_CPU]);
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+        assert_se(rl[RLIMIT_CPU]->rlim_cur == RLIM_INFINITY);
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+        assert_se(rl[RLIMIT_CPU]->rlim_cur == rl[RLIMIT_CPU]->rlim_max);
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+
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+        assert_se(config_parse_sec_limit(NULL, "fake", 1, "section", 1, "LimitCPU", RLIMIT_CPU, "1234ms", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_CPU]);
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+        assert_se(rl[RLIMIT_CPU]->rlim_cur == 2);
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+        assert_se(rl[RLIMIT_CPU]->rlim_cur == rl[RLIMIT_CPU]->rlim_max);
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+
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+        rl[RLIMIT_CPU] = free(rl[RLIMIT_CPU]);
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+
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+        assert_se(config_parse_usec_limit(NULL, "fake", 1, "section", 1, "LimitRTTIME", RLIMIT_RTTIME, "58", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_RTTIME]);
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+        assert_se(rl[RLIMIT_RTTIME]->rlim_cur == 58);
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+        assert_se(rl[RLIMIT_RTTIME]->rlim_cur == rl[RLIMIT_RTTIME]->rlim_max);
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+
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+        assert_se(config_parse_usec_limit(NULL, "fake", 1, "section", 1, "LimitRTTIME", RLIMIT_RTTIME, "59s", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_RTTIME]);
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+        assert_se(rl[RLIMIT_RTTIME]->rlim_cur == 59 * USEC_PER_SEC);
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+        assert_se(rl[RLIMIT_RTTIME]->rlim_cur == rl[RLIMIT_RTTIME]->rlim_max);
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+
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+        assert_se(config_parse_usec_limit(NULL, "fake", 1, "section", 1, "LimitRTTIME", RLIMIT_RTTIME, "infinity", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_RTTIME]);
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+        assert_se(rl[RLIMIT_RTTIME]->rlim_cur == RLIM_INFINITY);
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+        assert_se(rl[RLIMIT_RTTIME]->rlim_cur == rl[RLIMIT_RTTIME]->rlim_max);
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+
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+        assert_se(config_parse_usec_limit(NULL, "fake", 1, "section", 1, "LimitRTTIME", RLIMIT_RTTIME, "2345ms", rl, NULL) >= 0);
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+        assert_se(rl[RLIMIT_RTTIME]);
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+        assert_se(rl[RLIMIT_RTTIME]->rlim_cur == 2345 * USEC_PER_MSEC);
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+        assert_se(rl[RLIMIT_RTTIME]->rlim_cur == rl[RLIMIT_RTTIME]->rlim_max);
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+
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+        rl[RLIMIT_RTTIME] = free(rl[RLIMIT_RTTIME]);
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+}
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+
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 int main(int argc, char *argv[]) {
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         int r;
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@@ -553,6 +613,7 @@ int main(int argc, char *argv[]) {
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         r = test_unit_file_get_set();
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         test_config_parse_exec();
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+        test_config_parse_rlimit();
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         test_load_env_file_1();
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         test_load_env_file_2();
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         test_load_env_file_3();