netdev - Re: Question with secure_ipv4_port

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] [day] [month] [year] [list]

Date:	Sun, 22 Apr 2012 23:38:38 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	bhutchings@...arflare.com
Cc:	netdev@...r.kernel.org
Subject: Re: Question with secure_ipv4_port_ephemeral() implementation

Ben Hutchings wrote:
> All this randomisation is concerned with preventing spoofing attacks by
> attackers that can't see any packets routed to the spoofed address.  If
> they can see the return packets then this is all in vain, which is why
> we generally want cryptography at the transport or application level.
> But if they can't then the port offset remains secret - right?
> 
> (Port randomisation is not very useful on it own due to the small number
> space, but see
> <http://en.wikipedia.org/wiki/DNS_cache_poisoning#Prevention_and_mitigation>.)

Thank you. So, this change (which looked to me a regression) is not a regression.
--
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