netdev - Re: [nl80211] 584f2e43bb: hwsim.ap

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Date:   Mon, 11 Apr 2022 11:27:20 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Lee Jones <lee.jones@...aro.org>,
        kernel test robot <oliver.sang@...el.com>
Cc:     0day robot <lkp@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        stable@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [nl80211]  584f2e43bb: hwsim.ap_country.fail

On Mon, 2022-04-11 at 10:25 +0100, Lee Jones wrote:
> So what exactly happened here?  What does this failure tell us?

Probably nothing.

> Is the LKP test broken or did I overlook something in the kernel
> patch?

I think the test is just randomly fluking out.

> How does LKP make use of NL80211_ATTR_REG_ALPHA2?
> 
> I'm struggling to find any mention of 'hostapd.py' or 'ap_country' in
> LKP [0].  Are these benchmarks bespoke add-ons? 
> 

it's running the tests from hostap:
https://w1.fi/cgit/hostap/tree/tests/hwsim

Anyway, I think we'd better fix the issue like this:

-       [NL80211_ATTR_REG_ALPHA2] = { .type = NLA_STRING, .len = 2 },
+       /* allow 3 for NUL-termination, we used to declare this NLA_STRING */
+       [NL80211_ATTR_REG_ALPHA2] = NLA_POLICY_RANGE(NLA_BINARY, 2, 3),


What do you think?

johannes