From: Herbert Xu <herbert@gondor.apana.org.au>
To: David Miller <davem@davemloft.net>
Cc: eric.dumazet@gmail.com, netdev@vger.kernel.org, roland@purestorage.com
Subject: Re: arp_hash
Date: Mon, 23 Mar 2015 10:08:48 +1100 [thread overview]
Message-ID: <20150322230848.GA8989@gondor.apana.org.au> (raw)
In-Reply-To: <20150322.185850.927485035002538859.davem@davemloft.net>
On Sun, Mar 22, 2015 at 06:58:50PM -0400, David Miller wrote:
>
> But I do not agree with the idea that it is in any way possible to
> stop someone with root access on the physical network from crudding up
> our ARP hash tables.
But you don't need root access to exploit the neighbour hash
table. You just need a sufficiently large (e.g., /16) route
to a network and anybody on the system can then generate traffic
to it.
Granted these days hardly anybody on IPv4 would have such a route
but if you do then the hash table makes you exposed.
And for IPv6 everybody is potentially exposed.
Cheers,
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
next prev parent reply other threads:[~2015-03-22 23:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-22 11:42 arp_hash Herbert Xu
2015-03-22 12:56 ` arp_hash Eric Dumazet
2015-03-22 16:57 ` arp_hash David Miller
2015-03-22 21:21 ` arp_hash Herbert Xu
2015-03-22 21:56 ` arp_hash Herbert Xu
2015-03-22 22:51 ` arp_hash Herbert Xu
2015-03-22 23:22 ` arp_hash Herbert Xu
2015-03-22 23:35 ` arp_hash Herbert Xu
2015-03-23 10:58 ` arp_hash Herbert Xu
2015-03-22 22:58 ` arp_hash David Miller
2015-03-22 23:08 ` Herbert Xu [this message]
2015-03-22 23:50 ` arp_hash David Miller
2015-03-22 23:53 ` arp_hash Herbert Xu
2015-03-22 16:54 ` arp_hash David Miller
2015-03-22 21:34 ` arp_hash Herbert Xu
2015-03-22 22:57 ` arp_hash David Miller
2015-03-22 23:42 ` arp_hash Herbert Xu
2015-03-22 23:53 ` arp_hash David Miller
2015-03-23 11:01 ` arp_hash Herbert Xu
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