decnet: Disable auto-loading as mitigation against local exploits

svn path=/dists/trunk/linux-2.6/; revision=16571

debian/changelog

@@ -12,9 +12,9 @@ linux-2.6 (2.6.36-1~experimental.2) UNRELEASED; urgency=low
     has stalled and is a source of security bugs.
   * Disable Econet protocol.  It is unmaintained upstream, probably broken,
     and of historical interest only.
-  * af_802154,rds: Disable auto-loading as mitigation against local exploits.
-    These protocol modules are not widely used and can be explicitly loaded
-    or aliased on systems where they are wanted.
+  * af_802154,decnet,rds: Disable auto-loading as mitigation against local
+    exploits.  These protocol modules are not widely used and can be
+    explicitly loaded or aliased on systems where they are wanted.
 
  -- maximilian attems <max@stro.at>  Wed, 31 Oct 2010 13:23:11 +0200
 

debian/patches/debian/decnet-Disable-auto-loading-as-mitigation-against-lo.patch

@@ -0,0 +1,37 @@
+From 0061a6e7c7e5fef1d257cb2c2d9180f655ea5c1a Mon Sep 17 00:00:00 2001
+From: Ben Hutchings <ben@decadent.org.uk>
+Date: Sat, 20 Nov 2010 02:24:55 +0000
+Subject: [PATCH] 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>
+---
+ net/decnet/af_decnet.c |    2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
+index 7a58c87..ed9e2b0 100644
+--- a/net/decnet/af_decnet.c
++++ b/net/decnet/af_decnet.c
+@@ -2358,7 +2358,7 @@ void dn_unregister_sysctl(void);
+ 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 char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
+ 
+-- 
+1.7.2.3
+

debian/patches/series/1~experimental.2

@@ -1,2 +1,3 @@
 + debian/af_802154-Disable-auto-loading-as-mitigation-against.patch
 + debian/rds-Disable-auto-loading-as-mitigation-against-local.patch
++ debian/decnet-Disable-auto-loading-as-mitigation-against-lo.patch