From owner-freebsd-current@FreeBSD.ORG Tue Mar 22 16:30:58 2011 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 27632106566B for ; Tue, 22 Mar 2011 16:30:58 +0000 (UTC) (envelope-from anti_spam256@yahoo.ca) Received: from nm23-vm0.bullet.mail.ne1.yahoo.com (nm23-vm0.bullet.mail.ne1.yahoo.com [98.138.91.57]) by mx1.freebsd.org (Postfix) with SMTP id D731A8FC14 for ; Tue, 22 Mar 2011 16:30:57 +0000 (UTC) Received: from [98.138.90.53] by nm23.bullet.mail.ne1.yahoo.com with NNFMP; 22 Mar 2011 16:17:43 -0000 Received: from [98.138.87.6] by tm6.bullet.mail.ne1.yahoo.com with NNFMP; 22 Mar 2011 16:17:43 -0000 Received: from [127.0.0.1] by omp1006.mail.ne1.yahoo.com with NNFMP; 22 Mar 2011 16:17:43 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 158528.4268.bm@omp1006.mail.ne1.yahoo.com Received: (qmail 34055 invoked by uid 60001); 22 Mar 2011 16:17:43 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.ca; s=s1024; t=1300810663; bh=7y6/f2OEyk2TbtQD3UkKVfSDe/1UbkRLU2WXUSA07sc=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type; b=QqPpIwlZcIqN1L8VmZXGNIZ+1c1eTrsf/VanIIGMyUZHPLFB/pnN8V4V3Ljg315dhCn8BvbcvzKmOUlhK3lT8Q2i2Ehvi86IlihVHR01T65mzJ+wgk4OwL+xxAUHpf2lIrSF9yesXwyPsMGEczeLpckZ5/CuwO8F7Rzj15Lz5O8= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.ca; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type; b=lZG1dSiJlkXvXzoaEdR6w7j6rAfU8G3hyxJ17VYoDikEa3MlwB3wKGCmJpbXayUD9lzIrm5VI35nR1Wuq8M+rRGO5cWAWDykTh7PnXJtjPwSM6YmmisMg/ENVexoAMT960hppk1b8ytVEMtjtAxAluawFJjsKFHZCZnlixLe05o=; Message-ID: <38019.9725.qm@web120706.mail.ne1.yahoo.com> X-YMail-OSG: WQoZlwgVM1n2EH8YtoGAXJu_X5Ekbkhbb99yOhgOzXZ0fh5 tDQlAD1Sd12UlqQCQl0wmZlLpoUaxvrnIe2vddbEmUeA18sxUf.UNgSkB7UN zbVczug_d_y4K1vyS.YLg5rSRk6JcjhjCwuTXIL9NM.ctv3TNagl5s72MU7I Qkk6zayaPwPHbxCwuQUo2aQClYoYeIcm8kga6u8SDuO1CgT.Uj3ckaRSc78F aN98nDLgcxfj4KlZNpBRpbTMGgwswA1EhfVnUydRrWB8dNNpqiloAw1WPPfK e2k_vljFF3BytVXn5kz92DNsvB7d_f3hor6y87p7xAPre9Duf0bYbfktZOsj cxdphNJ5m3bieVC3B9p7nTAwCF9wq Received: from [216.86.107.143] by web120706.mail.ne1.yahoo.com via HTTP; Tue, 22 Mar 2011 09:17:42 PDT X-Mailer: YahooMailClassic/11.4.20 YahooMailWebService/0.8.109.295617 Date: Tue, 22 Mar 2011 09:17:42 -0700 (PDT) From: James Phillips To: freebsd-current@freebsd.org In-Reply-To: <20110322120025.6254F10656D5@hub.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Etienne Robillard Subject: Re: [CFR]RT305xF support, w/o attachment X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Mar 2011 16:30:58 -0000 > Date: Tue, 22 Mar 2011 06:46:12 -0400 > From: Etienne Robillard > Subject: Re: [CFR]RT305xF support, w/o attachment > To: Adrian Chadd > Cc: freebsd-current@freebsd.org > Message-ID: <4D887DF4.6060602@gthcfoundation.org> > Content-Type: text/plain; charset=ISO-8859-1 > > as far my knowledge goes, radiation from multi-frequency > subcarriers in > a multi-path > system such as a wireless network (802.11 a/g/n) or a > "microwave oven" > is something > you definitely want to avoid sitting in while hacking > FreeBSD... > > https://gthc.org/wiki/Advisories/OFDM_20110315 > > I may have done technical errors but i do not drink in the > morning!! :) > > > > > On 22/03/11 06:30 AM, Adrian Chadd wrote: > > So I'm curious - what exactly about OFDM do you have a > problem with? > > > > > > > > > > Adrian I have looked at your "security advisory" and also fail to understand what you are complaining about: "Problem Description The OFDM (Orthogonal Frequency Division Multiplexing) modulation scheme as implemented in the upper 802.11 protocol for Wireless LAN (WLAN) networking is inherently insecure as designed to allow multi-frequency radiation of arbitrary Q-I numbers access in the unregulated ISM band/range." A high-Q signal has a very sharp peak and narrow pass-band. This lets the radio get past the noise floor using less transmitter energy. I am not sure what a Q-I number is. You use the word "arbitrary." Are you claiming that OFDM allows the radios to exceed emission limits? As the other person commented, radio emmisions are regulated, even in the unlicensed spectrum. It would only be a security/safety issue if the radio exceeds legal limits. Your bounty suggests you have little/no evidence these limits are actually exceeded. A priviledge escalation exploit reprogramming a software-implemented radio to exceed radiation limits would be a concern, but it won't "cook" nearby users. The hardware would overheat before that happens. I agree excessive RF exposure should be avoided. I keep my wireless Access Point at its minimum power setting (1/4 power, 802.11g). Regards, James Phillips