From: Dmitry Torokhov <[email protected]> When creating various objects in /sys/class/net/... make sure that they belong to container's owner instead of global root (if they belong to a container/namespace).
Co-Developed-by: Tyler Hicks <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]> Signed-off-by: Tyler Hicks <[email protected]> --- net/core/net-sysfs.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 46 insertions(+), 1 deletion(-) diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index 405c41ecb20b..ada065fc685e 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -656,6 +656,24 @@ static const struct attribute_group wireless_group = { #define net_class_groups NULL #endif /* CONFIG_SYSFS */ +static void net_ns_get_ownership(const struct net *net, + kuid_t *uid, kgid_t *gid) +{ + if (net) { + kuid_t ns_root_uid = make_kuid(net->user_ns, 0); + kgid_t ns_root_gid = make_kgid(net->user_ns, 0); + + if (uid_valid(ns_root_uid)) + *uid = ns_root_uid; + + if (gid_valid(ns_root_gid)) + *gid = ns_root_gid; + } else { + *uid = GLOBAL_ROOT_UID; + *gid = GLOBAL_ROOT_GID; + } +} + #ifdef CONFIG_SYSFS #define to_rx_queue_attr(_attr) \ container_of(_attr, struct rx_queue_attribute, attr) @@ -905,11 +923,20 @@ static const void *rx_queue_namespace(struct kobject *kobj) return ns; } +static void rx_queue_get_ownership(struct kobject *kobj, + kuid_t *uid, kgid_t *gid) +{ + const struct net *net = rx_queue_namespace(kobj); + + net_ns_get_ownership(net, uid, gid); +} + static struct kobj_type rx_queue_ktype __ro_after_init = { .sysfs_ops = &rx_queue_sysfs_ops, .release = rx_queue_release, .default_attrs = rx_queue_default_attrs, - .namespace = rx_queue_namespace + .namespace = rx_queue_namespace, + .get_ownership = rx_queue_get_ownership, }; static int rx_queue_add_kobject(struct net_device *dev, int index) @@ -1431,11 +1458,20 @@ static const void *netdev_queue_namespace(struct kobject *kobj) return ns; } +static void netdev_queue_get_ownership(struct kobject *kobj, + kuid_t *uid, kgid_t *gid) +{ + const struct net *net = netdev_queue_namespace(kobj); + + net_ns_get_ownership(net, uid, gid); +} + static struct kobj_type netdev_queue_ktype __ro_after_init = { .sysfs_ops = &netdev_queue_sysfs_ops, .release = netdev_queue_release, .default_attrs = netdev_queue_default_attrs, .namespace = netdev_queue_namespace, + .get_ownership = netdev_queue_get_ownership, }; static int netdev_queue_add_kobject(struct net_device *dev, int index) @@ -1625,6 +1661,14 @@ static const void *net_namespace(struct device *d) return dev_net(dev); } +static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid) +{ + struct net_device *dev = to_net_dev(d); + const struct net *net = dev_net(dev); + + net_ns_get_ownership(net, uid, gid); +} + static struct class net_class __ro_after_init = { .name = "net", .dev_release = netdev_release, @@ -1632,6 +1676,7 @@ static struct class net_class __ro_after_init = { .dev_uevent = netdev_uevent, .ns_type = &net_ns_type_operations, .namespace = net_namespace, + .get_ownership = net_get_ownership, }; #ifdef CONFIG_OF_NET -- 2.7.4
