net: create reusable function for getting ownership info of sysfs inodes

Make net_ns_get_ownership() reusable by networking code outside of core.
This is useful, for example, to allow bridge related sysfs files to be
owned by container root.

Add a function comment since this is a potentially dangerous function to
use given the way that kobject_get_ownership() works by initializing uid
and gid before calling .get_ownership().

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index a71264d..9b5fdc5 100644 (file)
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -10,6 +10,7 @@
 #include <linux/workqueue.h>
 #include <linux/list.h>
 #include <linux/sysctl.h>
+#include <linux/uidgid.h>
 
 #include <net/flow.h>
 #include <net/netns/core.h>
@@ -170,6 +171,8 @@ extern struct net init_net;
 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
                        struct net *old_net);
 
+void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
+
 void net_ns_barrier(void);
 #else /* CONFIG_NET_NS */
 #include <linux/sched.h>
@@ -182,6 +185,13 @@ static inline struct net *copy_net_ns(unsigned long flags,
        return old_net;
 }
 
+static inline void net_ns_get_ownership(const struct net *net,
+                                       kuid_t *uid, kgid_t *gid)
+{
+       *uid = GLOBAL_ROOT_UID;
+       *gid = GLOBAL_ROOT_GID;
+}
+
 static inline void net_ns_barrier(void) {}
 #endif /* CONFIG_NET_NS */
 

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index ada065f..0a95bcf 100644 (file)
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -656,24 +656,6 @@ 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)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index a11e03f..738871a 100644 (file)
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -17,6 +17,7 @@
 #include <linux/user_namespace.h>
 #include <linux/net_namespace.h>
 #include <linux/sched/task.h>
+#include <linux/uidgid.h>
 
 #include <net/sock.h>
 #include <net/netlink.h>
@@ -448,6 +449,33 @@ dec_ucounts:
        return net;
 }
 
+/**
+ * net_ns_get_ownership - get sysfs ownership data for @net
+ * @net: network namespace in question (can be NULL)
+ * @uid: kernel user ID for sysfs objects
+ * @gid: kernel group ID for sysfs objects
+ *
+ * Returns the uid/gid pair of root in the user namespace associated with the
+ * given network namespace.
+ */
+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;
+       }
+}
+EXPORT_SYMBOL_GPL(net_ns_get_ownership);
+
 static void unhash_nsid(struct net *net, struct net *last)
 {
        struct net *tmp;