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/shared/seccomp-util.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/shared/seccomp-util.h')
| -rw-r--r-- | src/shared/seccomp-util.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/shared/seccomp-util.h b/src/shared/seccomp-util.h index f0b9f455ab..438a6671bc 100644 --- a/src/shared/seccomp-util.h +++ b/src/shared/seccomp-util.h @@ -66,3 +66,5 @@ const SyscallFilterSet *syscall_filter_set_find(const char *name); int seccomp_add_syscall_filter_set(scmp_filter_ctx seccomp, const SyscallFilterSet *set, uint32_t action); int seccomp_load_filter_set(uint32_t default_action, const SyscallFilterSet *set, uint32_t action); + +int seccomp_restrict_namespaces(unsigned long retain); |