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[83.28.84.190]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47aa0f214d2sm14522801f8f.33.2026.07.05.01.59.41 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Sun, 05 Jul 2026 01:59:42 -0700 (PDT) Date: Sun, 5 Jul 2026 10:59:38 +0200 From: Michal Pecio To: Greg Kroah-Hartman Cc: Michel =?UTF-8?B?RMOkbnplcg==?= , Mathias Nyman , linux-usb@vger.kernel.org Subject: Re: 7.1 regression bisected to "usb: core: Fix SuperSpeed root hub wMaxPacketSize" Message-ID: <20260705105938.797e87ac.michal.pecio@gmail.com> In-Reply-To: <2026070255-rerun-unstable-a90a@gregkh> References: <577c7ba6-c638-4e73-acac-fbf6c4fb4ccc@linux.intel.com> <20260702105152.415afeaa.michal.pecio@gmail.com> <80bdd3da-33c0-44b4-a1af-6aca44c1acd6@mailbox.org> <2026070255-rerun-unstable-a90a@gregkh> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Thu, 2 Jul 2026 14:22:25 +0200, Greg Kroah-Hartman wrote: > On Thu, Jul 02, 2026 at 02:20:05PM +0200, Michel D=C3=A4nzer wrote: > > That reminded me that I'm using (an older upstream version of) > > usbguard. Unfortunately its GUI notifications when it blocks a USB > > device aren't working reliably currently. > >=20 > > Manually firing up its settings app revealed that it was indeed > > blocking the USB3 hub. Overriding it to be allowed fixed the issue > > with the bisected commit. > >=20 > > Looks like a false alert after all, sorry for the noise, and thanks > > for the help. =20 >=20 > Thanks for letting us know, and this isn't the first time that > usbguard has caused a problem recently. Did we change something that > broke it's functionality? A few weeks ago we corrected a small inconsistency in USB 3.0 root hub descriptors to avoid some warnings. That's the bisected patch. Apparently, usbguard can be configured to reject all devices except for a list of descriptor hashes. Not sure if there are other whitelisting options besides hashes? Using this method for root hubs seems to bring no security benefit (you trust the kernel, right?), only trouble. Now, these systems require user action to authorize the new descriptor. Otherwise, usbguard runs amok and disables USB 3.0 root hubs with all children, AFAIU. Or is there more to it and the issue is somehow magically specific to Lenovo USB docks? Both affected users complained about such docks, but maybe they are simply the only USB devices used by usbguard users :) Regards, Michal