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-prev] [thread-next>] [day] [month] [year] [list]
Date:	Wed, 21 May 2014 16:18:41 -0400 (EDT)
From:	David Miller <>
Subject: Re: Revert 462fb2af9788a82a534f8184abfde31574e1cfa0 (bridge :
 Sanitize skb before it enters the IP stack)

From: Bart De Schuymer <>
Date: Wed, 21 May 2014 20:51:14 +0200

> David Newall schreef op 21/05/2014 9:49:
>>> An alternative would be to make sure that the data pointed to by IPCB
>>> and BR_INPUT_SKB_CB don't overlap. If this were the case, we could
>>> indeed just revert the commit that was referred to.
>> They are identical spaces, but you imply a good point: the cb area is
>> possibly being used, simultaneously, for two, incompatible
>> purposes. Yet
>> another argument for divorcing bridge of ip logic.
> There's no reason why they should overlap in the cb: it's 48 bytes
> big, so big enough to hold both struct br_input_skb_cb and struct
> inet_skb_parm. The original problem was introduced when
> BR_INPUT_SKB_CB was introduced (around Feb 27, 2010), so fixing
> BR_INPUT_SKB_CB seems most appropriate to me.

So you are suggesting the patch below will fix everything?

> As for your other remark: as I've said before, if you don't like
> bridge-netfilter then don't compile it into your kernel.

That's never a good argument, please stop making it.

%99.999999999 of users get their kernels from distributions and
they are all going to enable basically every feature available.

We never should have added bridging netfilter to the tree in the
first place, I wish I had better judgment back then.

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 06811d7..2300def 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -18,6 +18,7 @@
 #include <linux/netpoll.h>
 #include <linux/u64_stats_sync.h>
 #include <net/route.h>
+#include <net/ip.h>
 #include <linux/if_vlan.h>
 #define BR_HASH_BITS 8
@@ -297,6 +298,7 @@ struct net_bridge
 struct br_input_skb_cb {
+	struct inet_skb_parm ip;
 	struct net_device *brdev;
 	int igmp;
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists