linux-kernel - Re: spamm of cfg80211: Calling CRDA to update world regulatory domain

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

Message-ID: <4ECFC992.6020706@gmail.com>
Date:	Fri, 25 Nov 2011 09:00:02 -0800
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Andreas Hartmann <andihartmann@...19freenet.de>
CC:	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: spamm of cfg80211: Calling CRDA to update world regulatory domain

On 11/25/2011 06:48 AM, Andreas Hartmann wrote:
> Hi,
>
> Justin P. Mattock schrieb:
>> is there a way to get rid of this annoying spamming of the regulatory?
>>
>>
>> [  338.519037] cfg80211: Calling CRDA to update world regulatory domain
>> [  338.523266] cfg80211: World regulatory domain updated:
>> [  338.523269] cfg80211:     (start_freq - end_freq @ bandwidth),
>> (max_antenna_gain, max_eirp)
>> [  338.523272] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz),
>> (300 mBi, 2000 mBm)
>> [  338.523276] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz),
>> (300 mBi, 2000 mBm)
>> [  338.523279] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz),
>> (300 mBi, 2000 mBm)
>> [  338.523281] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz),
>> (300 mBi, 2000 mBm)
>> [  338.523284] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz),
>> (300 mBi, 2000 mBm)
>
> I can see these messages with compat-wireless-2011-11-22, two. They are
> sent out every 3 or 4 seconds. compat-wireless-2011-10-31 doesn't show
> the problem.
>
>
> Andreas
>

yep! usually if I go to starbucks to do things this message shows 
up(think most public areas I get this a lot).
if I connect to a home router this does not spamm the syslog that 
much(still does, just not as easily).
attached is dmesg of syslog at starbucks, within 10mins I already have 
like 3/4 of this..

http://fpaste.org/xzaz/

looking through the kernel I see mixed areas in of which this is 
triggered..:

net/wireless/reg.c:381

static int call_crda(const char *alpha2)
{
     if (!is_world_regdom((char *) alpha2))
         pr_info("Calling CRDA for country: %c%c\n",
             alpha2[0], alpha2[1]);
     else
         pr_info("Calling CRDA to update world regulatory domain\n");

     /* query internal regulatory database (if it exists) */
     reg_regdb_query(alpha2);

     return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
}

net/mac80211/work.c:498:

static enum work_action __must_check
ieee80211_authenticate(struct ieee80211_work *wk)
{

<----- lots of code --------->

     printk(KERN_DEBUG "%s: authenticate with %pM (try %d)\n",
            sdata->name, wk->filter_ta, wk->probe_auth.tries);

now not sure how this mechanism works, but there are _two_ approaches 
for the regulatory domain:

1) have the kernel use something like alpha2 that automatically 
finds/search _query's_ for the country or something.
or
2) manually add your country to net/wireless/db.txt with the country 
causing alpha1 to be used, which I think causes the kernel to not query 
for CRDA.

NOTE: I only spent a little time reading up on this, and trying it out 
so I might have got this wrong. all of this is on
http://linuxwireless.org/en/developers/Regulatory

Justin P. Mattock

--
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/