netdev - Re: [PATCH] ipv4: remove ip_rt

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]

Message-ID: <1273176614.2222.21.camel@edumazet-laptop>
Date:	Thu, 06 May 2010 22:10:14 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [PATCH] ipv4: remove ip_rt_secret timer


> Doing that doesn't solve my aim however, which is to avoid performing rt_genid
> updates when no one is attacking you at all.  I completely agree that we can
> start the gen_id at some random value (by forcing an initial invalidation),
> however.  Beyond that however, if someone is managing to guess our secret value,
> then we need to make our secret value more complex to determine.  Perhaps given
> the reduction in the number of times we need to iterate our gen_id with the
> timer gone, we can use something more heavyweight to determine the the hash
> secret (the cprng perhaps?).

Secrets that dont change are known to be honey pots for hackers.

I just dont see why we want to risk security regressions for something
that proved to work well.

Cache invalidation is just a genid change nowadays, and dont have side
effects.

Considering we do cache invalidation when routes are changed anyway, I
dont get why we should avoid the invalidation once every xxx seconds...

If you believe this cache invalidation has problems, maybe we should
address them and not hide them ?



--
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