netdev - Re: [RFC PATCH] tcp: Replace possible syn attack msg by counters

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, 10 Aug 2011 23:13:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC PATCH] tcp: Replace possible syn attack msg by counters

From: Tom Herbert <therbert@...gle.com>
Date: Wed, 10 Aug 2011 22:38:02 -0700 (PDT)

> Rather than printing the message to the log, use a mib counter to keep
> track of the count of occurences of syn cookies being used or syn
> being dropped when request queue is full.
> 
> Rationale is these messages can fill up /var/log/messages on server
> which is simply under heavy load... I'm not sure how much more useful
> they would be in identifying a server DOS attack (compared to
> counters).
> 
> Signed-off-by: Tom Herbert <therbert@...gle.com>

Print the message once, and also do the counters.

Say something like "Possible SYN flooding, see SNMP counters." or
similar.

Because if people are grepping for that message in their logs, they
will now have a false sense of confidence seeing it not being there
any more.
--
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