X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=man%2Fsystemd.exec.xml;h=e82e1f59f0ec87d6fa4c56849175558c6177aef8;hb=e9642be2cce7f5e90406980092a6f71f504a16af;hp=f4caccdd23ada352ab2f8c36c50c888a252aa7cc;hpb=82adf6af7c72b852449346835f33184a841b4796;p=elogind.git

diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index f4caccdd2..e82e1f59f 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -248,7 +248,7 @@
                                 <listitem><para>Controls the CPU
                                 affinity of the executed
                                 processes. Takes a space-separated
-                                list of CPU indexes. This option may
+                                list of CPU indices. This option may
                                 be specified more than once in which
                                 case the specificed CPU affinity masks
                                 are merged. If the empty string is
@@ -472,9 +472,9 @@
                         <varlistentry>
                                 <term><varname>StandardError=</varname></term>
                                 <listitem><para>Controls where file
-                                descriptor 2 (STDERR) of the executed
-                                processes is connected to. The
-                                available options are identical to
+                                descriptor 2 (standard error) of the
+                                executed processes is connected to.
+                                The available options are identical to
                                 those of
                                 <varname>StandardOutput=</varname>,
                                 with one exception: if set to
@@ -491,8 +491,8 @@
                         <varlistentry>
                                 <term><varname>TTYPath=</varname></term>
                                 <listitem><para>Sets the terminal
-                                device node to use if standard input,
-                                output or stderr are connected to a
+                                device node to use if standard input, output,
+                                or error are connected to a
                                 TTY (see above). Defaults to
                                 <filename>/dev/console</filename>.</para></listitem>
                         </varlistentry>
@@ -1001,7 +1001,7 @@
                                 list of system call
                                 names. If this setting is used, all
                                 system calls executed by the unit
-                                process except for the listed ones
+                                processes except for the listed ones
                                 will result in immediate process
                                 termination with the
                                 <constant>SIGSYS</constant> signal
@@ -1029,7 +1029,83 @@
                                 merged. If the empty string is
                                 assigned, the filter is reset, all
                                 prior assignments will have no
-                                effect.</para></listitem>
+                                effect.</para>
+
+                                <para>If you specify both types of
+                                this option (i.e. whitelisting and
+                                blacklisting), the first encountered
+                                will take precedence and will dictate
+                                the default action (termination or
+                                approval of a system call). Then the
+                                next occurrences of this option will
+                                add or delete the listed system calls
+                                from the set of the filtered system
+                                calls, depending of its type and the
+                                default action. (For example, if you have started
+                                with a whitelisting of
+                                <function>read</function> and
+                                <function>write</function>, and right
+                                after it add a blacklisting of
+                                <function>write</function>, then
+                                <function>write</function> will be
+                                removed from the set.)
+                                </para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>SystemCallErrorNumber=</varname></term>
+
+                                <listitem><para>Takes an
+                                <literal>errno</literal> error number
+                                name to return when the system call
+                                filter configured with
+                                <varname>SystemCallFilter=</varname>
+                                is triggered, instead of terminating
+                                the process immediately. Takes an
+                                error name such as
+                                <literal>EPERM</literal>,
+                                <literal>EACCES</literal> or
+                                <literal>EUCLEAN</literal>. When this
+                                setting is not used, or when the empty
+                                string is assigned, the process will be
+                                terminated immediately when the filter
+                                is triggered.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>SystemCallArchitectures=</varname></term>
+
+                                <listitem><para>Takes a space
+                                separated list of architecture
+                                identifiers to include in the system
+                                call filter. The known architecture
+                                identifiers are
+                                <literal>x86</literal>,
+                                <literal>x86-64</literal>,
+                                <literal>x32</literal>,
+                                <literal>arm</literal> as well as the
+                                special identifier
+                                <literal>native</literal>. Only system
+                                calls of the specified architectures
+                                will be permitted to processes of this
+                                unit. This is an effective way to
+                                disable compatibility with non-native
+                                architectures for processes, for
+                                example to prohibit execution of
+                                32-bit x86 binaries on 64-bit x86-64
+                                systems. The special
+                                <literal>native</literal> identifier
+                                implicitly maps to the native
+                                architecture of the system (or more
+                                strictly: to the architecture the
+                                system manager is compiled for). Note
+                                that setting this option to a
+                                non-empty list implies that
+                                <literal>native</literal> is included
+                                too. By default, this option is set to
+                                the empty list, i.e. no architecture
+                                system call filtering is
+                                applied.</para></listitem>
                         </varlistentry>
 
                 </variablelist>