linux-kernel - Re: netconsole: tulip: possible remote DoS? due to kernel freeze on heavy RX traffic after Order-1 allocation failure

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] [day] [month] [year] [list]

Date:	Fri, 6 Nov 2009 06:49:54 +0100
From:	Tobias Diedrich <ranma@...edrich.de>
To:	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org
Subject: Re: netconsole: tulip: possible remote DoS? due to kernel freeze
	on heavy RX traffic after Order-1 allocation failure

Tobias Diedrich wrote:
> Matt Mackall wrote:
> > Running out of order-1 buffers hasn't been a problem for most people
> > lately though - is there anything interesting about your workload? Lots
> > of threads? NFS? Long network processing latencies?

BTW I think that the allocator bug in 2.6.31 is responsible for me
seeing these allocation failures, since I never had problems with
older kernels.
http://lkml.org/lkml/2009/10/22/128

However since I can reproduce it even on 2.6.30 (and presumably even
older kernels) with enough memory pressure and it causes the kernel
to hang with netconsole enabled (see my other followup, it seems to be
fine without netconsole) I think this should be fixed to not
hang the kernel.

-- 
Tobias						PGP: http://8ef7ddba.uguu.de
--
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/