linux-kernel - Re: [RFC] bridge: STP timer management range checking

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:	Mon, 1 Sep 2008 09:38:27 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Stephen Hemminger <stephen.hemminger@...tta.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	David Miller <davem@...emloft.net>,
	Dushan Tcholich <dusanc@...il.com>,
	Francois Romieu <romieu@...zoreil.com>,
	Robert Hancock <hancockr@...w.ca>, netdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	bridge@...ts.linux-foundation.org
Subject: Re: [RFC] bridge: STP timer management range checking

> > Seems bogus extra code to me - stops things working that should be
> > allowed too.
> >   
> The timer configuration is propagated in network protocol, so 
> misconfigured Linux box
> could survive but effect other devices on the network that are less 
> robust. Maybe the

That would be irrelevant. CAP_NET_ADMIN lets you make that size mess
anyway.

> small values would cause some other bridge to crash, go infinite loop, ...
> More likely robust devices might ignore our packets (because values out 
> of range), leading to
> routing loops and other disasters.

Spamming tree isn't secure, news at 11.

> The kernel does need to stop administrative settings from taking out a 
> network. 

If you have CAP_NET_ADMIN you can trivially take out the network unless
it is properly switched.

Now you might want your pretty little GUI and/or config tools to warn
people that their configuration is outside 802 specs but that is a
different matter altogether

Alan
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/