diff options
| author | Lennart Poettering <lennart@poettering.net> | 2012-07-17 04:17:53 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2012-07-17 04:17:53 +0200 |
| commit | 8351ceaea9480d9c2979aa2ff0f4982cfdfef58d (patch) | |
| tree | fc1f94e5a17679960774da386a54d145255e4ef1 /man | |
| parent | cd96b3b86abb4a88cac2722bdfb6e5d4413f6831 (diff) | |
execute: support syscall filtering using seccomp filters
Diffstat (limited to 'man')
| -rw-r--r-- | man/systemd.exec.xml | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml index c04db12e3b..6e55d8dfcf 100644 --- a/man/systemd.exec.xml +++ b/man/systemd.exec.xml @@ -1091,6 +1091,54 @@ shell pipelines.</para></listitem> </varlistentry> + <varlistentry> + <term><varname>NoNewPrivileges=</varname></term> + + <listitem><para>Takes a boolean + argument. If true ensures that the + service process and all its children + can never gain new privileges. This + option is more powerful than the respective + secure bits flags (see above), as it + also prohibits UID changes of any + kind. This is the simplest, most + effective way to ensure that a process + and its children can never elevate + privileges again.</para></listitem> + </varlistentry> + + <varlistentry> + <term><varname>SystemCallFilter=</varname></term> + + <listitem><para>Takes a space + separated list of system call + names. If this setting is used all + system calls executed by the unit + process except for the listed ones + will result in immediate process + termination with the SIGSYS signal + (whitelisting). If the first character + of the list is <literal>~</literal> + the effect is inverted: only the + listed system calls will result in + immediate process termination + (blacklisting). If this option is used + <varname>NoNewPrivileges=yes</varname> + is implied. This feature makes use of + the Secure Computing Mode 2 interfaces + of the kernel ('seccomp filtering') + and is useful for enforcing a minimal + sandboxing environment. Note that the + <function>execve</function>, + <function>rt_sigreturn</function>, + <function>sigreturn</function>, + <function>exit_group</function>, + <function>exit</function> system calls + are implicitly whitelisted and don't + need to be listed + explicitly.</para></listitem> + </varlistentry> + </variablelist> </refsect1> |