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[69.131.150.190]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7bd6688c99bsm20899847b3.45.2026.05.01.22.51.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 01 May 2026 22:51:13 -0700 (PDT) Message-ID: Date: Sat, 2 May 2026 01:51:08 -0400 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] Documentation: security-bugs: explain what is and is not a security bug To: Willy Tarreau Cc: Greg KH , leon@kernel.org, security@kernel.org, Jonathan Corbet , skhan@linuxfoundation.org, workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Qubes Developer Mailing List References: <20260426163914.19449-1-w@1wt.eu> <20260426163914.19449-3-w@1wt.eu> <2026042753-ozone-jigsaw-4ad5@gregkh> <2026042724-bullhorn-bobtail-ae6f@gregkh> <2026042804-overbook-ripeness-73dd@gregkh> <1d3f8659-8c69-47f6-bb38-4c1d06cf8307@gmail.com> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------TMhIlk3Zk9K5K7WgPsspRVjc" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------TMhIlk3Zk9K5K7WgPsspRVjc Content-Type: multipart/mixed; boundary="------------00u6kZDuriHLxjcEq06mWEYZ"; protected-headers="v1" Message-ID: Date: Sat, 2 May 2026 01:51:08 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] Documentation: security-bugs: explain what is and is not a security bug To: Willy Tarreau Cc: Greg KH , leon@kernel.org, security@kernel.org, Jonathan Corbet , skhan@linuxfoundation.org, workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Qubes Developer Mailing List References: <20260426163914.19449-1-w@1wt.eu> <20260426163914.19449-3-w@1wt.eu> <2026042753-ozone-jigsaw-4ad5@gregkh> <2026042724-bullhorn-bobtail-ae6f@gregkh> <2026042804-overbook-ripeness-73dd@gregkh> <1d3f8659-8c69-47f6-bb38-4c1d06cf8307@gmail.com> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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boundary="------------O0wx1Vs1R2lUB8RCKRNJTymW" --------------O0wx1Vs1R2lUB8RCKRNJTymW Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 5/2/26 01:35, Willy Tarreau wrote: > Hi Demi Marie, >=20 > On Sat, May 02, 2026 at 01:20:10AM -0400, Demi Marie Obenour wrote: >>>>> Ah, but USB does cover "some" modification of devices, so this is g= oing >>>>> to be something that is good to document over time, if for no other= >>>>> reason to keep these scanning tools in check from hallucinating cra= zy >>>>> situations that are obviously not a valid thing we care about. >>>> >>>> OK but does this mean you still want to get these reports in the end= ? >>> >>> I want a patch if a user cares about that threat-model (as Android do= es >>> but no one else) as it's up to the user groups that want to change th= e >>> default kernel's behavior like this to actually submit patches to do = so. >> FYI, I don't think this is limited to Android. Chrome OS definitely >> cares about malicious USB devices, and the whole purpose of USBGuard i= s >> to prevent a USB device from being able to compromise the system unles= s >> authorized. I believe Qubes OS also cares, as it supports USB device >> assignment to virtual machines. CCing qubes-devel for confirmation. >> >> What should that patch look like? Could there be a way for these user= >> groups to be informed of vulnerabilities in the USB subsystem, so that= >> they can take responsibility for fixing them before they become public= ? >=20 > I've posted a proposal elsewhere in the same thread: >=20 > https://lore.kernel.org/lkml/afSxSX8RK0Z4kkOI@1wt.eu/ I saw that, but it's still not quite clear what is meant here. My understanding is that those concerned about malicious USB devices are generally concerned about _arbitrary_ malicious USB devices. The one thing a USB device shouldn't be able to spoof is the port it is plugged into, and userspace tools like USBGuard can use that information. But to do that, they have to trust that the device can't harm the system if it isn't assigned to any drivers. >> It does make sense for those who care about the security of a subsyste= m >> to be responsible for vulnerabilities in that system, but right now >> I'm not sure how one would offer to take up that responsibility. >=20 > I think that at least some subsystems will want to add their own > restrictions based on the bug reports they keep receiving, and I hope > it can help distros figure where there's a gap between is promised to > users and what the kernel promises, that needs to be filled by userland= > verification tools for example. >=20 > Willy I think there might be another category, which is were there is a third party who is much more interested in the security of a subsystem than its primary maintainers are. I suspect that Google is said third party in multiple such cases, especially various USB drivers. In particular, exploiting the kernel via USB is a common attack technique used in the wild by tools like Cellebrite. In these cases, I think it makes sense to funnel vulnerability reports to the people who actually seriously care about fixing them. For instance, problems in USB might be funneled to the Chrome OS and Android security teams. They will get fixed much more quickly, and upstream maintainers won't be flooded with reports that don't have attached patches. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------O0wx1Vs1R2lUB8RCKRNJTymW Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; filename="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49y B+l2nipdaq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYf bWpr/si88QKgyGSVZ7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/ UorR+FaSuVwT7rqzGrTlscnTDlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7M MPCJwI8JpPlBedRpe9tfVyfu3euTPLPxwcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9H zx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR6h3nBc3eyuZ+q62HS1pJ5EvU T1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl5FMWo8TCniHynNXs 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Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmn1kMwACgkQszaHOrMp 8lNL4Q/+O9hFrxeYaY5k5+uOleltf2bGOqx/wF92JjJujCRH2hNXCcL7T9OIawKF UFtIlu/KDy6htCFYiU1YS2HPBARt55p19yQiK45XRejPz7YBoHuKOv08J1VdbBm4 pyqQZuxXM8aKWURqyH/XBm6ESHa962mZfuIxeyXws7io/OmyfGbBYJ/htH8QYs7D nOAv8/iM6A4CtsL2MaFS0dbM0kAizSsdanjMpU9fmsiOP39JEEgMoEDZ8HGQZoF0 uDQw/DIQiWZBqFRV69iVqky0PHaT8/ZePtSIjM9Kvcce68aH0MDxQhmxZFbzxNm5 qQYGeqmH/jyr2F70yrrSrJKARy+5oCWzfHY1WYQhlw6dYaiNSwHVgjuZTStDIo5u /5WvI8Yqt8J30e8JnjVMPFK3qBY9ai96ChqR1uQU+ATHkesMHcmkQvAJMJcQUeQz vm2SFXPH7R+HhSpbqeXwEnGPWG2hizBp6ywY+h+POsO6rs65TwqFDNO8UcsU+86x KoqCgWASqH0CpoNieIFfSYd+G8UsIuVjbBvKoHWF7sV2jqWOEEX0U/BUc6U0Yjgw JSe98WaCZBNIfxVQB7blrSXZrR5JSh8yXPtTd0Ez4xFhxBq3aec7UjXrMjpYbEG+ ieJU+NQb8p0kfG1bMGj3+wxtrnkwhia8ERcLguinpagjcwzekTc= =qn+d -----END PGP SIGNATURE----- --------------TMhIlk3Zk9K5K7WgPsspRVjc--