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From: Denis Kenzior <denkenz@gmail.com>
To: Johannes Berg <johannes@sipsolutions.net>,
	Tim Kourt <tim.a.kourt@linux.intel.com>
Cc: linux-wireless@vger.kernel.org
Subject: Re: [PATCH] cfg80211: Fix support for flushing old scan results
Date: Tue, 22 May 2018 09:50:44 -0500	[thread overview]
Message-ID: <00d912c8-ecf1-8dea-fc54-c73c73f01afb@gmail.com> (raw)
In-Reply-To: <1526976774.6787.7.camel@sipsolutions.net>

Hi Johannes,

On 05/22/2018 03:12 AM, Johannes Berg wrote:
> Hi Denis,
> 
>> Just FYI, there's definitely something funny with the scanning code:
>>
>> denkenz@iwd-test ~ $ sudo iw dev wlp2s0 scan flush
>> BSS 10:c3:7b:54:74:d4(on wlp2s0)
>> 	last seen: 274.815s [boottime]
>> 	freq: 5765
>> 	beacon interval: 100 TUs
>> 	signal: -35.00 dBm
>> 	last seen: 349 ms ago
>> 	Information elements from Probe Response frame:
>> 	SSID: \x00\x00\x00\x00\x00\x00\x00\x00\x00
> 
> This is already rather strange to start with. Can you provide a sniffer
> capture of this situation?

Will do

> 
> Thing is - the all-zero-bytes there points to using hidden SSID with a
> length of 9 characters, BUT
>   * "myssid" is just 6 characters long - or did you edit that?

Good eyes!  Yes this was edited to protect the innocent neighbors ;)

>   * normally the zeroed-out SSID isn't transmitted in a *probe response*
>     but only in beacons

Exactly.  That's what makes this really weird.

Regards,
-Denis

  reply	other threads:[~2018-05-22 14:50 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11 16:48 [PATCH] cfg80211: Fix support for flushing old scan results Tim Kourt
2018-05-18  8:13 ` Johannes Berg
2018-05-18 16:47   ` Denis Kenzior
2018-05-18 18:54     ` Arend van Spriel
2018-05-18 19:00       ` Denis Kenzior
2018-05-22  7:24         ` Arend van Spriel
2018-05-22 14:48           ` Denis Kenzior
2018-05-22 14:50             ` Johannes Berg
2018-05-22 14:51               ` Johannes Berg
2018-05-22 15:03                 ` Denis Kenzior
2018-05-22  8:12     ` Johannes Berg
2018-05-22 14:50       ` Denis Kenzior [this message]
2018-05-22 20:12     ` Johannes Berg
2018-05-22 20:37       ` Denis Kenzior
2018-05-22 20:40         ` Johannes Berg
2018-05-22 20:49           ` Denis Kenzior
2018-05-22 20:52             ` Johannes Berg
2018-05-22 21:00               ` Denis Kenzior
2018-05-22 21:11                 ` Johannes Berg
2018-05-22 21:25                   ` Denis Kenzior
2018-05-22 21:28                     ` Johannes Berg
2018-05-22 21:45                       ` Denis Kenzior
2018-05-23  7:08                         ` Johannes Berg

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