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Subject[PATCH net-next v3 6/8] net-sysfs: make sure objects belong to container's owner
Date
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

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>
---
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
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