net: Update the per network namespace sysctls to be available to the network namespace owner

- Allow anyone with CAP_NET_ADMIN rights in the user namespace of the
  the netowrk namespace to change sysctls.
- Allow anyone the uid of the user namespace root the same
  permissions over the network namespace sysctls as the global root.
- Allow anyone with gid of the user namespace root group the same
  permissions over the network namespace sysctl as the global root group.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 1 deletions

diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index e98f3932bdf..6410436aa49 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -41,11 +41,21 @@ static int is_seen(struct ctl_table_set *set)
 static int net_ctl_permissions(struct ctl_table_header *head,
                                struct ctl_table *table)
 {
+        struct net *net = container_of(head->set, struct net, sysctls);
+        kuid_t root_uid = make_kuid(net->user_ns, 0);
+        kgid_t root_gid = make_kgid(net->user_ns, 0);
+
         /* Allow network administrator to have same access as root. */
-        if (capable(CAP_NET_ADMIN)) {
+        if (ns_capable(net->user_ns, CAP_NET_ADMIN) ||
+            uid_eq(root_uid, current_uid())) {
                 int mode = (table->mode >> 6) & 7;
                 return (mode << 6) | (mode << 3) | mode;
         }
+        /* Allow netns root group to have the same assess as the root group */
+        if (gid_eq(root_gid, current_gid())) {
+                int mode = (table->mode >> 3) & 7;
+                return (mode << 3) | (mode << 3) | mode;
+        }
         return table->mode;
 }