diff options
| author | Ronny Chevalier <chevalier.ronny@gmail.com> | 2016-01-30 17:26:39 +0100 |
|---|---|---|
| committer | Ronny Chevalier <chevalier.ronny@gmail.com> | 2016-02-28 14:44:26 +0100 |
| commit | 19c0b0b9a5039b842cf9e6c3e7ece75fb8725602 (patch) | |
| tree | 0414f22ec6d435c0d23457280b067e4b897d8186 /man | |
| parent | 06fb28b16eb4b6170c2e2c0cf1f673730309509b (diff) | |
core: set NoNewPrivileges for seccomp if we don't have CAP_SYS_ADMIN
The manpage of seccomp specify that using seccomp with
SECCOMP_SET_MODE_FILTER will return EACCES if the caller do not have
CAP_SYS_ADMIN set, or if the no_new_privileges bit is not set. Hence,
without NoNewPrivilege set, it is impossible to use a SystemCall*
directive with a User directive set in system mode.
Now, NoNewPrivileges is set if we are in user mode, or if we are in
system mode and we don't have CAP_SYS_ADMIN, and SystemCall*
directives are used.
Diffstat (limited to 'man')
| -rw-r--r-- | man/systemd.exec.xml | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml index c1f47e84e6..3e1a2cb224 100644 --- a/man/systemd.exec.xml +++ b/man/systemd.exec.xml @@ -1155,7 +1155,9 @@ 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 running in - user mode and this option is used, + user mode, or in system mode, but without the + <constant>CAP_SYS_ADMIN</constant> capabiblity (e.g. setting + <varname>User=nobody</varname>), <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 @@ -1214,8 +1216,10 @@ systems. The special <constant>native</constant> identifier implicitly maps to the native architecture of the system (or more strictly: to the architecture the system manager is - compiled for). If running in user mode and this option is - used, <varname>NoNewPrivileges=yes</varname> is implied. Note + compiled for). If running in user mode, or in system mode, + but without the <constant>CAP_SYS_ADMIN</constant> + capabiblity (e.g. setting <varname>User=nobody</varname>), + <varname>NoNewPrivileges=yes</varname> is implied. Note that setting this option to a non-empty list implies that <constant>native</constant> is included too. By default, this option is set to the empty list, i.e. no architecture system @@ -1244,8 +1248,10 @@ <function>socketpair()</function> (which creates connected AF_UNIX sockets only) are unaffected. Note that this option has no effect on 32-bit x86 and is ignored (but works - correctly on x86-64). If running in user mode and this option - is used, <varname>NoNewPrivileges=yes</varname> is implied. By + correctly on x86-64). If running in user mode, or in system + mode, but without the <constant>CAP_SYS_ADMIN</constant> + capabiblity (e.g. setting <varname>User=nobody</varname>), + <varname>NoNewPrivileges=yes</varname> is implied. By default, no restriction applies, all address families are accessible to processes. If assigned the empty string, any previous list changes are undone.</para> |