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authorAndrey Vagin <avagin@openvz.org>2016-09-06 10:47:13 +0300
committerEric W. Biederman <ebiederm@xmission.com>2016-09-23 03:59:39 +0300
commitbcac25a58bfc6bd79191ac5d7afb49bea96da8c9 (patch)
tree28a8ae71b2939267deba0807bcbbed28e77470c0 /kernel/utsname.c
parent29b4817d4018df78086157ea3a55c1d9424a7cfc (diff)
downloadlinux-bcac25a58bfc6bd79191ac5d7afb49bea96da8c9.tar.xz
kernel: add a helper to get an owning user namespace for a namespace
Return -EPERM if an owning user namespace is outside of a process current user namespace. v2: In a first version ns_get_owner returned ENOENT for init_user_ns. This special cases was removed from this version. There is nothing outside of init_user_ns, so we can return EPERM. v3: rename ns->get_owner() to ns->owner(). get_* usually means that it grabs a reference. Acked-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Andrei Vagin <avagin@openvz.org> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'kernel/utsname.c')
-rw-r--r--kernel/utsname.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/utsname.c b/kernel/utsname.c
index 831ea7108232..e1211a8a5c18 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -130,10 +130,16 @@ static int utsns_install(struct nsproxy *nsproxy, struct ns_common *new)
return 0;
}
+static struct user_namespace *utsns_owner(struct ns_common *ns)
+{
+ return to_uts_ns(ns)->user_ns;
+}
+
const struct proc_ns_operations utsns_operations = {
.name = "uts",
.type = CLONE_NEWUTS,
.get = utsns_get,
.put = utsns_put,
.install = utsns_install,
+ .owner = utsns_owner,
};