[PATCH 6/9] net-sysfs: make sure objects belong to container's owner

[Tyler Hicks]

From: Dmitry Torokhov <dmitry.torokhov at gmail.com>

BugLink: https://launchpad.net/bugs/1784501

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 at canonical.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov at gmail.com>
Signed-off-by: Tyler Hicks <tyhicks at canonical.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit b0e37c0d8a6abed0cd1b611314a7ebf50b0a8ed4)
Signed-off-by: Tyler Hicks <tyhicks at 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 adbcd10d7f5f..e753f88dbec5 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -679,6 +679,24 @@ 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)
@@ -928,11 +946,20 @@ 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)
@@ -1341,11 +1368,20 @@ 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)
@@ -1535,6 +1571,14 @@ 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,
@@ -1542,6 +1586,7 @@ 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