linux-kernel - Re: [PATCH v3] USB: hub.c: decrease the number of attempts of enumeration scheme

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-next>] [day] [month] [year] [list]

Message-ID: <20200915094531.GA8046@lxhi-065.adit-jv.com>
Date:   Tue, 15 Sep 2020 11:45:31 +0200
From:   Eugeniu Rosca <erosca@...adit-jv.com>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg KH <gregkh@...uxfoundation.org>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <andrew_gabbasov@...tor.com>, Baxter Jim <jim_baxter@...tor.com>,
        "Natsume, Wataru (ADITJ/SWG)" <wnatsume@...adit-jv.com>,
        "Nishiguchi, Naohiro (ADITJ/SWG)" <nnishiguchi@...adit-jv.com>,
        浅野恭史 <yasano@...adit-jv.com>,
        kernel test robot <rong.a.chen@...el.com>,
        yasushi asano <yazzep@...il.com>,
        Martin Mueller <Martin.Mueller5@...bosch.com>,
        Eugeniu Rosca <roscaeugeniu@...il.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>
Subject: Re: [PATCH v3] USB: hub.c: decrease the number of attempts of
 enumeration scheme

Dear Alan,
Dear Greg,

On Fri, Sep 11, 2020 at 11:12:28AM -0400, Alan Stern wrote:

> The thing is, I'm afraid that without these retry loops, some devices
> will stop working.  If that happens, we will not be able to keep this
> patch in place; we will just have to accept that we fail the PET test.
> 
> Alan Stern

Does this mean that Linux community leaves no choice but to ship a
forked kernel (with no chance of alignment to upstream) for
organizations which design embedded devices where USB plays a key
role, hence requires passing the USB-IF Compliance Program [*]?

Is there hope to give users a knob (build-time or run-time) which would
enable the behavior expected and thoroughly described in compliance
docs, particularly chapter "6.7.22 A-UUT Device No Response for
connection timeout" of "USB On-The-Go and Embedded Host Automated
Compliance Plan" [**]?

[*] https://www.usb.org/compliance
[**] https://www.usb.org/sites/default/files/otgeh_compliance_plan_1_2.pdf

-- 
Best regards,
Eugeniu Rosca