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[159.2.239.150]) by smtp.gmail.com with ESMTPSA id 71dfb90a1353d-5eca8de4908sm4235128e0c.15.2026.11.05.06.03.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 06:03:53 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1xOy4G-00000002ecj-0pCb; Thu, 05 Nov 2026 10:03:52 -0400 Date: Thu, 5 Nov 2026 10:03:52 -0400 From: Jason Gunthorpe To: Leon Romanovsky Cc: Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Dmitry Torokhov , Andrew Lunn , Heiner Kallweit , Russell King , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Johannes Berg , Jonathan Corbet , Shuah Khan , Randy Dunlap , Bjorn Helgaas , "Joerg Roedel (AMD)" , Suravee Suthikulpanit , Vasant Hegde , Will Deacon , Robin Murphy , David Woodhouse , Lu Baolu , Johan Hovold , Eric Dumazet , Marcel Holtmann , Luiz Augusto von Dentz , Nipun Gupta , Nikhil Agarwal , Pieter Jansen van Vuuren , linux-kernel@vger.kernel.org, driver-core@lists.linux.dev, linux-input@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-usb@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, iommu@lists.linux.dev Subject: Re: [PATCH 17/17] PCI: Replace untrusted state with device trust Message-ID: <20261105140352.GF3889730@ziepe.ca> References: <20261105-device-trust-core-v1-0-1e536825b4eb@nvidia.com> <20261105-device-trust-core-v1-17-1e536825b4eb@nvidia.com> <2026110526-aerobics-correct-4c06@gregkh> <20261105131856.GA8298@unreal> X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261105131856.GA8298@unreal> On Thu, Nov 05, 2026 at 03:18:56PM +0200, Leon Romanovsky wrote: > On Thu, Nov 05, 2026 at 08:12:51AM -0500, Greg Kroah-Hartman wrote: > > On Thu, Nov 05, 2026 at 01:42:30PM +0200, Leon Romanovsky wrote: > > > From: Leon Romanovsky > > > > > > Convert the PCI specific untrusted to use the common device trust > > > level. Adversarial means the same thing untrusted does. > > > > What about for USB? Will that "move" to use this common trust level? > > If not, I don't think it's very "common" :) > > It supposed to work for all buses out-of-the box, at least this is the > intention. You mean DISABLED/FULL should work with this patch series on USB right? Meaning the core code will not bind a USB driver when DISABLED? I was wondering if some of the broader things we are doing on PCIe also apply to USB, like device authentication. I don't know alot about USB, but I got AI to help me find some relavent spec information. https://usb.org/authentication This looks like the parallel to PCIe SPDM device authentication. I would expect it to work broadly the same way as PCIe if anyone wanted to implement it: 1) USB discovery discovers authentication support and creates an attestation subsystem device for it 2) The struct device starts up with trust = DISABLED 3) Userspace runs the crypto flow through attestation subsystem. This is extremely similar looking to PCIe SPDM: 1. GET_DIGESTS -> device returns a hash for each certificate chain slot it has. 2. GET_CERTIFICATE -> device returns its certificate chain, read in pieces. 3. CHALLENGE (nonce) -> device returns CHALLENGE_AUTH: the chain hash, a salt, a hash of its descriptors, and a signature over the challenge and the response. 4) Userspace inspects the above and approves the device 5) trust = FULL, driver is probed. But I supposed Greg is asking about /sys/bus/usb/devices/DEVICE/authorized .. Jason