netdev - Re: Linux kernel patch: elide fib_validate_source() completely when possible

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:	Wed, 22 Jan 2014 18:53:05 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	ja@....bg, gregory.hoggarth@...iedtelesis.co.nz,
	netdev@...r.kernel.org
Subject: Re: Linux kernel patch: elide fib_validate_source() completely
 when possible - bad side effect?

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Thu, 23 Jan 2014 03:02:24 +0100

> On Wed, Jan 22, 2014 at 11:04:52PM +0200, Julian Anastasov wrote:
>> 	I don't remember someone mentioning about such
>> side-effect, I guess it is overlooked. IMHO, it is not a good
>> reason to restore the old behavior. Lets see other opinions.
> 
> A routing lookup to check for broadcast is much too expansive, I agree. But
> can't we just check skb->pkt_type == PACKET_BROADCAST?

We can't universally know what a broadcast is, because the prefix of
every network is a local piece of information.

We might not have the route necessary to know the source address is
a broadcast if the packet came through more than 1 hop already.
--
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