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net-sysfs: make sure objects belong to container's owner 

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 <tyhicks@canonical.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Torokhov 2018-07-20 21:56:52 +00:00 committed by David S. Miller
parent 3033fced2f
commit b0e37c0d8a
1 changed files with 46 additions and 1 deletions
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47
net/core/net-sysfs.c
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@ -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