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-prev] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 5 Aug 2013 15:22:13 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Nestor Lopez Casado <nlopezcasad@...itech.com>,
	Andrew de los Reyes <adlr@...omium.org>,
	joseph.salisbury@...onical.com,
	linux-input <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] HID: hid-logitech-dj, querying_devices was never
 set

On Fri, 2 Aug 2013, Benjamin Tissoires wrote:

> > Could you please elaborate? (and put an elaborate description to revert
> > commit log perhaps?)
> 
> Sure, so here is the revert commit log:
> 
> --
> 
> Commit "HID: hid-logitech-dj, querying_devices was never set" activate
> a flag which guarantees that we do not ask the receiver for too many
> enumeration. When the flag is set, each following enumeration call is
> discarded (the usb request is not forwarded to the receiver). The flag
> is then released when the driver receive a pairing information event,
> which normally follows the enumeration request.
> However, the USB3 bug makes the driver think the enumeration request
> has been forwarded to the receiver. However, it is actually not the
> case because the USB stack returns -EPIPE. So, when a new unknown
> device appears, the workaround consisting in asking for a new
> enumeration is not working anymore: this new enumeration is discarded
> because of the flag, which is never reset.
> 
> A solution could be to trigger a timeout before releasing it, but for
> now, let's just revert the patch.
> 
> --

Thanks Benjamin.

I'd like to have a bit more clarification about the USB3 bug, as this 
whole issue is not completely clear to me.

To be more specific -- when exactly do we receive -EPIPE, why do we 
receive it and why do we not handle it properly?

Thanks again,

-- 
Jiri Kosina
SUSE Labs
--
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/

Powered by blists - more mailing lists