decnet: Disable auto-loading as mitigation against local exploits

Recent review has revealed several bugs in obscure protocol
implementations that can be exploited by local users for denial of
service or privilege escalation.  We can mitigate the effect of any
remaining vulnerabilities in such protocols by preventing unprivileged
users from loading the modules, so that they are only exploitable on
systems where the administrator has chosen to load the protocol.

The 'decnet' protocol is unmaintained and of mostly historical
interest, and the user-space support package 'dnet-common' loads the
module explicitly.  Therefore disable auto-loading.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Gbp-Pq: Topic debian
Gbp-Pq: Name decnet-Disable-auto-loading-as-mitigation-against-lo.patch

diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 518cea17b81139a3f4a907e6e2aff14b00fdd6b9..770b030898e9aaf55617b8a2a7dfa1233127911d 100644 (file)
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -2358,7 +2358,7 @@ static const struct proto_ops dn_proto_ops = {
 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
 MODULE_AUTHOR("Linux DECnet Project Team");
 MODULE_LICENSE("GPL");
-MODULE_ALIAS_NETPROTO(PF_DECnet);
+/* MODULE_ALIAS_NETPROTO(PF_DECnet); */
 
 static const char banner[] __initconst = KERN_INFO
 "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";