netdev - Re: possible bridge regression in "bridge: implement [add/del]

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:	Fri, 1 Jul 2011 12:08:33 +0200
From:	David Lamparter <equinox@...c24.net>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	"David S. Miller" <davem@...emloft.net>,
	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: possible bridge regression in "bridge: implement [add/del]_slave
 ops"?

On Thu, Jun 30, 2011 at 10:08:19AM -0700, Stephen Hemminger wrote:
> On Thu, 30 Jun 2011 10:33:23 +0200
> Alexander Stein <alexander.stein@...tec-electronic.com> wrote:
> 
> > * echo $(pgrep rstpd) > /var/run/rstpd.pid
> > * brctl addbr br1
> > * echo 1 > /sys/class/net/br1/bridge/stp_state
> 
> This bogus. You are running both kernel and spanning
> tree daemon at the same time!
> 
> Doing the echo of 1 to stp_state forces kernel spanning
> tree. You want 2 which is what is supposed to be use for user
> mode spanning tree.

I just tested this on my box, you can't echo 2 into that sysfs file (it
reads back as 1).

That you can change this variable at all when an userspace stp
implementation is running is a bug anyway, IMHO. rstpd should do all the
required settings and the kernel should prevent them from being changed
while rstpd has the bridge under its control.


-David

--
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