netdev - RE: [v4 PATCH 1/2] NETFILTER module xt_hmark, new target for HASH based fwmark

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

Date:	Fri, 25 Nov 2011 15:36:20 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Hans Schillstrom <hans@...illstrom.com>, kaber@...sh.net,
	pablo@...filter.org, jengelh@...ozas.de,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	hans.schillstrom@...csson.com
Subject: RE: [v4 PATCH 1/2] NETFILTER module xt_hmark, new target for HASH
 based fwmark

Le vendredi 25 novembre 2011 à 14:19 +0000, David Laight a écrit :
> > +	addr1 = (__force u32) ip6->saddr.s6_addr32[3];
> > +	addr2 = (__force u32) ip6->daddr.s6_addr32[3];
> ...
> > +	ports.v32 = * (__force u32 *) (skb->data + nhoff);
> 
> Is this code even vaguely portable??

Yes it is.

> I suspect the 'ports' bit has serious endianness problems.

We dont care of endianness here, and we document it with the (__force
u32) cast.



> I'm also not sure whether linux guarantees the alignment
> of skb->data here.


It is guaranteed in whole linux stack.


--
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