net: Don't export sysctls to unprivileged users

[karo-tx-linux.git] / net / ipv4 / ip_fragment.c

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 448e68546827431098c980bafc4a63967764942f..1cf6a768cd53d7a0effdca659dff243689cb9bf6 100644 (file)
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -802,6 +802,10 @@ static int __net_init ip4_frags_ns_ctl_register(struct net *net)
                table[0].data = &net->ipv4.frags.high_thresh;
                table[1].data = &net->ipv4.frags.low_thresh;
                table[2].data = &net->ipv4.frags.timeout;
+
+               /* Don't export sysctls to unprivileged users */
+               if (net->user_ns != &init_user_ns)
+                       table[0].procname = NULL;
        }
 
        hdr = register_net_sysctl(net, "net/ipv4", table);