From 5e2afba4ecd7931ea06e6fa116ab28e6943dbd42 Mon Sep 17 00:00:00 2001 From: Paul Guo Date: Mon, 14 Nov 2011 19:00:54 +0800 Subject: netfilter: possible unaligned packet header in ip_route_me_harder This patch tries to fix the following issue in netfilter: In ip_route_me_harder(), we invoke pskb_expand_head() that rellocates new header with additional head room which can break the alignment of the original packet header. In one of my NAT test case, the NIC port for internal hosts is configured with vlan and the port for external hosts is with general configuration. If we ping an external "unknown" hosts from an internal host, an icmp packet will be sent. We find that in icmp_send()->...->ip_route_me_harder()->pskb_expand_head(), hh_len=18 and current headroom (skb_headroom(skb)) of the packet is 16. After calling pskb_expand_head() the packet header becomes to be unaligned and then our system (arch/tile) panics immediately. Signed-off-by: Paul Guo Acked-by: Eric Dumazet Signed-off-by: Pablo Neira Ayuso --- net/ipv4/netfilter.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/ipv4/netfilter.c') diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c index 9899619ab9b8..4f47e064e262 100644 --- a/net/ipv4/netfilter.c +++ b/net/ipv4/netfilter.c @@ -64,7 +64,8 @@ int ip_route_me_harder(struct sk_buff *skb, unsigned addr_type) /* Change in oif may mean change in hh_len. */ hh_len = skb_dst(skb)->dev->hard_header_len; if (skb_headroom(skb) < hh_len && - pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC)) + pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)), + 0, GFP_ATOMIC)) return -1; return 0; -- cgit v1.2.3-59-g8ed1b