This is a note to let you know that I've just added the patch titled
netfilter: nfnetlink_log: fix maximum packet length logged to userspace
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
netfilter-nfnetlink_log-fix-maximum-packet-length-logged-to-userspace.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c1e7dc91eed0ed1a51c9b814d648db18bf8fc6e9 Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@xxxxxxxxx>
Date: Thu, 23 Oct 2014 10:36:07 +0200
Subject: netfilter: nfnetlink_log: fix maximum packet length logged to userspace
From: Florian Westphal <fw@xxxxxxxxx>
commit c1e7dc91eed0ed1a51c9b814d648db18bf8fc6e9 upstream.
don't try to queue payloads > 0xffff - NLA_HDRLEN, it does not work.
The nla length includes the size of the nla struct, so anything larger
results in u16 integer overflow.
This patch is similar to
9cefbbc9c8f9abe (netfilter: nfnetlink_queue: cleanup copy_range usage).
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/netfilter/nfnetlink_log.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -45,7 +45,8 @@
#define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
#define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
#define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
-#define NFULNL_COPY_RANGE_MAX 0xFFFF /* max packet size is limited by 16-bit struct nfattr nfa_len field */
+/* max packet size is limited by 16-bit struct nfattr nfa_len field */
+#define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN)
#define PRINTR(x, args...) do { if (net_ratelimit()) \
printk(x, ## args); } while (0);
@@ -255,6 +256,8 @@ nfulnl_set_mode(struct nfulnl_instance *
case NFULNL_COPY_PACKET:
inst->copy_mode = mode;
+ if (range == 0)
+ range = NFULNL_COPY_RANGE_MAX;
inst->copy_range = min_t(unsigned int,
range, NFULNL_COPY_RANGE_MAX);
break;
@@ -682,8 +685,7 @@ nfulnl_log_packet(struct net *net,
break;
case NFULNL_COPY_PACKET:
- if (inst->copy_range == 0
- || inst->copy_range > skb->len)
+ if (inst->copy_range > skb->len)
data_len = skb->len;
else
data_len = inst->copy_range;
Patches currently in stable-queue which might be from fw@xxxxxxxxx are
queue-3.14/netfilter-nf_log-account-for-size-of-nlmsg_done-attribute.patch
queue-3.14/netfilter-nf_log-release-skbuff-on-nlmsg-put-failure.patch
queue-3.14/netfilter-nfnetlink_log-fix-maximum-packet-length-logged-to-userspace.patch
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