netdev - [RFC-PATCH] netfilter: payload_len is be16, add size of struct rather than size of pointer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1226078023.11596.17.camel@brick>
Date:	Fri, 07 Nov 2008 09:13:43 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Wensong Zhang <wensong@...uxvirtualserver.org>,
	Julian Anastasov <ja@....bg>
Cc:	David Miller <davem@...emloft.net>,
	linux-netdev <netdev@...r.kernel.org>
Subject: [RFC-PATCH] netfilter: payload_len is be16, add size of struct
 rather than size of pointer

payload_len is a be16 value, not cpu_endian, also the size of a ponter
to a struct ipv6hdr was being added, not the size of the struct itself.

Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
I'm quite supicious of the following code in net/netfilter/ipvs/ip_vs_xmit.c

Line 714:
	iph->payload_len	=	old_iph->payload_len + sizeof(old_iph);

I believe that the payload_len is a big-endian value and this is treating it as
cpu-ordered.  In addition, it is adding the size of a pointer to a struct ipv6hdr
and not the size of the struct itself.

If I'm correct, I'd suggest the following is what _may_ have been intended.

 net/netfilter/ipvs/ip_vs_xmit.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
index 2f36721..425ab14 100644
--- a/net/netfilter/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c
@@ -711,7 +711,8 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 	iph			=	ipv6_hdr(skb);
 	iph->version		=	6;
 	iph->nexthdr		=	IPPROTO_IPV6;
-	iph->payload_len	=	old_iph->payload_len + sizeof(old_iph);
+	iph->payload_len	=	old_iph->payload_len;
+	be16_add_cpu(&iph->payload_len, sizeof(*old_iph));
 	iph->priority		=	old_iph->priority;
 	memset(&iph->flow_lbl, 0, sizeof(iph->flow_lbl));
 	iph->daddr		=	rt->rt6i_dst.addr;
-- 
1.6.0.3.756.gb776d



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html