net: ipv6: check route protocol when deleting routes (Closes: #855153)

debian/changelog

@@ -247,6 +247,7 @@ linux (4.9.10-1) UNRELEASED; urgency=medium
   * test-patches: Use the pkg.linux.notools build profile
   * test-patches: Set default number of jobs to number of available processors
   * dccp: Disable auto-loading as mitigation against local exploits
+  * net: ipv6: check route protocol when deleting routes (Closes: #855153)
 
   [ Roger Shimizu ]
   * [armel] ARM: dts: orion5x-lschl: Fix model name

debian/patches/bugfix/all/net-ipv6-check-route-protocol-when-deleting-routes.patch

@@ -0,0 +1,32 @@
+From: Mantas M <grawity@gmail.com>
+Date: Fri, 16 Dec 2016 10:30:59 +0200
+Subject: net: ipv6: check route protocol when deleting routes
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+Origin: https://git.kernel.org/linus/c2ed1880fd61a998e3ce40254a99a2ad000f1a7d
+Bug-Debian: https://bugs.debian.org/855153
+
+The protocol field is checked when deleting IPv4 routes, but ignored for
+IPv6, which causes problems with routing daemons accidentally deleting
+externally set routes (observed by multiple bird6 users).
+
+This can be verified using `ip -6 route del <prefix> proto something`.
+
+Signed-off-by: Mantas Mikulėnas <grawity@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ net/ipv6/route.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/net/ipv6/route.c
++++ b/net/ipv6/route.c
+@@ -2166,6 +2166,8 @@ static int ip6_route_del(struct fib6_con
+ 				continue;
+ 			if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
+ 				continue;
++			if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
++				continue;
+ 			dst_hold(&rt->dst);
+ 			read_unlock_bh(&table->tb6_lock);
+ 

debian/patches/series

@@ -75,6 +75,7 @@ bugfix/all/nbd-use-loff_t-for-blocksize-and-nbd_set_size-args.patch
 bugfix/all/ath9k-fix-null-pointer-dereference.patch
 bugfix/all/nbd-fix-64-bit-division.patch
 bugfix/all/pegasus-use-heap-buffers-for-all-register-access.patch
+bugfix/all/net-ipv6-check-route-protocol-when-deleting-routes.patch
 
 # Miscellaneous features