- rel 2; fixes CVE-2017-6074 (local root)

diff --git a/kernel-small_fixes.patch b/kernel-small_fixes.patch
index 19cf3c8744f075a2d0774b4b99b385b962dd7c8b..3ac8a0bb6f5863a1b0df259a7772e02a99fae9d7 100644 (file)
--- a/kernel-small_fixes.patch
+++ b/kernel-small_fixes.patch
@@ -73,3 +73,50 @@ index 098ce9b179ee..fcf8d0aa66ec 100644
 -- 
 2.11.0
 
+From 5edabca9d4cff7f1f2b68f0bac55ef99d9798ba4 Mon Sep 17 00:00:00 2001
+From: Andrey Konovalov <andreyknvl@google.com>
+Date: Thu, 16 Feb 2017 17:22:46 +0100
+Subject: dccp: fix freeing skb too early for IPV6_RECVPKTINFO
+
+In the current DCCP implementation an skb for a DCCP_PKT_REQUEST packet
+is forcibly freed via __kfree_skb in dccp_rcv_state_process if
+dccp_v6_conn_request successfully returns.
+
+However, if IPV6_RECVPKTINFO is set on a socket, the address of the skb
+is saved to ireq->pktopts and the ref count for skb is incremented in
+dccp_v6_conn_request, so skb is still in use. Nevertheless, it gets freed
+in dccp_rcv_state_process.
+
+Fix by calling consume_skb instead of doing goto discard and therefore
+calling __kfree_skb.
+
+Similar fixes for TCP:
+
+fb7e2399ec17f1004c0e0ccfd17439f8759ede01 [TCP]: skb is unexpectedly freed.
+0aea76d35c9651d55bbaf746e7914e5f9ae5a25d tcp: SYN packets are now
+simply consumed
+
+Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
+Acked-by: Eric Dumazet <edumazet@google.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ net/dccp/input.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/net/dccp/input.c b/net/dccp/input.c
+index ba34718..8fedc2d 100644
+--- a/net/dccp/input.c
++++ b/net/dccp/input.c
+@@ -606,7 +606,8 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
+                       if (inet_csk(sk)->icsk_af_ops->conn_request(sk,
+                                                                   skb) < 0)
+                               return 1;
+-                      goto discard;
++                      consume_skb(skb);
++                      return 0;
+               }
+               if (dh->dccph_type == DCCP_PKT_RESET)
+                       goto discard;
+-- 
+cgit v0.12
+

diff --git a/kernel.spec b/kernel.spec
index 6c1f6bd572ad21e0c2c98a968e79cff05bdcc42e..e379f516d51add95368048ef86acfef12d58d529 100644 (file)
--- a/kernel.spec
+++ b/kernel.spec
@@ -70,7 +70,7 @@
 %define                have_pcmcia     0
 %endif
 
-%define                rel             1
+%define                rel             2
 %define                basever         4.4
 %define                postver         .50