diff options
| author | Lennart Poettering <lennart@poettering.net> | 2016-11-01 20:25:19 -0600 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2016-11-04 07:40:13 -0600 |
| commit | add005357d535681c7075ced8eec2b6e61b43728 (patch) | |
| tree | b780280f06df0b09c738173602cb90c599597996 /src/core/load-fragment.h | |
| parent | 9156493171cf2d78e1ac1a3746c385b0e281acf1 (diff) | |
core: add new RestrictNamespaces= unit file setting
This new setting permits restricting whether namespaces may be created and
managed by processes started by a unit. It installs a seccomp filter blocking
certain invocations of unshare(), clone() and setns().
RestrictNamespaces=no is the default, and does not restrict namespaces in any
way. RestrictNamespaces=yes takes away the ability to create or manage any kind
of namspace. "RestrictNamespaces=mnt ipc" restricts the creation of namespaces
so that only mount and IPC namespaces may be created/managed, but no other
kind of namespaces.
This setting should be improve security quite a bit as in particular user
namespacing was a major source of CVEs in the kernel in the past, and is
accessible to unprivileged processes. With this setting the entire attack
surface may be removed for system services that do not make use of namespaces.
Diffstat (limited to 'src/core/load-fragment.h')
| -rw-r--r-- | src/core/load-fragment.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/core/load-fragment.h b/src/core/load-fragment.h index c05f205c37..1cff815a50 100644 --- a/src/core/load-fragment.h +++ b/src/core/load-fragment.h @@ -116,6 +116,7 @@ int config_parse_fdname(const char *unit, const char *filename, unsigned line, c int config_parse_sec_fix_0(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); int config_parse_user_group(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); int config_parse_user_group_strv(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); +int config_parse_restrict_namespaces(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); /* gperf prototypes */ const struct ConfigPerfItem* load_fragment_gperf_lookup(const char *key, unsigned length); |