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[69.131.147.66]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-65ecfd9c481sm3944355d50.14.2026.05.24.19.37.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 24 May 2026 19:37:49 -0700 (PDT) Message-ID: <96977898-81a0-4c79-a95f-0b288e0572a6@gmail.com> Date: Sun, 24 May 2026 22:37:43 -0400 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net] vsock/virtio: fix potential unbounded skb queue From: Demi Marie Obenour To: Stefano Garzarella , "Michael S. Tsirkin" Cc: Eric Dumazet , Arseniy Krasnov , Bobby Eshleman , Stefan Hajnoczi , "David S . 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Tsirkin" Cc: Eric Dumazet , Arseniy Krasnov , Bobby Eshleman , Stefan Hajnoczi , "David S . Miller" , Jakub Kicinski , Paolo Abeni , Simon Horman , netdev@vger.kernel.org, eric.dumazet@gmail.com, Arseniy Krasnov , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , kvm@vger.kernel.org, virtualization@lists.linux.dev, "virtio-comment@lists.linux.dev" , Manuel Stoeckl , Alyssa Ross , Spectrum Development , systemd development , Val Packett References: <20260506113554-mutt-send-email-mst@kernel.org> <20260507074113-mutt-send-email-mst@kernel.org> <20260507163710-mutt-send-email-mst@kernel.org> <20260508055343-mutt-send-email-mst@kernel.org> Content-Language: en-US Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT In-Reply-To: Autocrypt-Gossip: addr=hi@alyssa.is; 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boundary="------------zozaXoiubNNQg2Pi3q63btx4" --------------zozaXoiubNNQg2Pi3q63btx4 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 5/23/26 17:00, Demi Marie Obenour wrote: > On 5/8/26 06:11, Stefano Garzarella wrote: >> On Fri, May 08, 2026 at 05:58:06AM -0400, Michael S. Tsirkin wrote: >>> On Fri, May 08, 2026 at 11:41:21AM +0200, Stefano Garzarella wrote: >>>> On Thu, May 07, 2026 at 06:48:47PM -0400, Michael S. Tsirkin wrote: >>>>> On Thu, May 07, 2026 at 02:59:13PM +0200, Stefano Garzarella wrote:= >>>>>> On Thu, May 07, 2026 at 07:45:10AM -0400, Michael S. Tsirkin wrote= : >>>>>>> On Thu, May 07, 2026 at 11:09:47AM +0200, Stefano Garzarella wrot= e: >>>> >>>> [...] >>>> >>>>>>>> For now, we're already doing something: >>>>>>>> merging the skuffs if they don't have EOM set. >>>>>>> >>>>>>> >>>>>>> Right that's good. You could go further and merge with EOM too >>>>>>> if you stick the info about message boundaries somewhere else. >>>>>> >>>>>> This adds a lot of complexity IMO, but we can try. >>>>>> >>>>>> Do you have something in mind? >>>>> >>>>> BER is clearly overkill but here's a POC that claude made for me, >>>>> just to give u an idea. It's clearly has a ton of issues, >>>>> for example I dislike how GFP_ATOMIC is handled. >>>> >>>> Okay, I somewhat understand, but clearly this isn't net material >>> >>> I doubt we have many other options given reverting the regression was= >>> ruled out. >> >> As Eric pointed out, we can't revert it. >=20 > Could there be an option to disable the mitigation in guests, for the > situation where the host is trusted? There are VMMs that implement > AF_VSOCK in userspace with a backing AF_UNIX socket. >=20 >>>> so for now >>>> I think the best thing to do is to merge the fixup I sent (or someth= ing >>>> similar): >>>> https://lore.kernel.org/netdev/20260508092330.69690-1-sgarzare@redha= t.com/ >>> >>> I reviewed that one, problem is it's a spec violation/change that we'= ll >>> have to support forever. >> >> I have a few points to make on this, but let's discuss them there. >> >>> >>>> This is a major change that should be merged with more caution. >>>> Could this have too much of an impact on performance? >>>> >>>> Thanks, >>>> Stefano >>> >>> It's really a POC, real patch is left as an excersise for the reader = >>> :). >> >> eheh, I see, but honestly, this overcomplication scares me. I'll try t= o=20 >> think it over. >> >>> The correct approach IMHO is to only start using this >>> when we wasted a lot of memory on small packets. >>> >>> For example, if sum(truesize) >=3D buf size. >>> >>> then we'll not see a perf impact unless it's already pathological. >> >> Agree on this, which is similar to what I'm doing in that patch. =20 >> Reducing the advertised buf_alloc only in pathological cases (e.g. =20 >> overhead > buf_alloc). >=20 > This isn't enough to prevent data loss due to race conditions. >=20 > I'm CCing the virtio-comment list and a few others. >=20 > Right now, any application that needs to send massive amount of > data over a vsock is simply broken. This isn't just theoretical. > It's causing real-world problems for users of Waypipe. > Waypipe forwards Wayland protocol messages over AF_VSOCK, > so it can send a large amount of traffic over the socket. > See https://gitlab.freedesktop.org/mstoceckl/waypipe/work_items/165. >=20 > If one is willing to mutate the ring buffer in-place, or to maintain > an auxiliary counter, it's possible to store all messages with bounded > (in practice) overhead. Specifically: >=20 > - If the first byte of a block of data is nonzero, it's a > variable-length length. 1 byte for messages less than 128 bytes. >=20 > - If the first byte of a block of data is zero, the subsequent bytes > are a variable-length counter that stores the number of consecutive > zero-byte messages. >=20 > That adds a lot of complexity, which is very unfortunate for something > that needs to be backported to stable kernels. I also suspect it > requires all access to the ring buffer to take a lock rather than > being lock-free. But it's the only approach that I can think of that > can work with the current spec. >=20 > Could there at least be a normative note stating that drivers and > devices should treat each message as consuming 1024 bytes + the size > of the message itself, and warning that anything that doesn't is > going to be broken in practice? >=20 > I'm CCing Val Packet (of Invisible Things Lab) and Alyssa Ross > (of Spectrum) because both of them are working on systems that rely > critically on vsock. Update: I see that patches have been upstreamed (with CC: stable) that reset the connection instead of data loss. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------zozaXoiubNNQg2Pi3q63btx4 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 BtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2Bkg1b//r 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attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmoTtfgACgkQszaHOrMp 8lP1ig/9HDw/fWpY9WCusUdMNdpaTPNtsO0FTOlBrGe/zUcAQ63OIYuWuHAqH7vQ zvg6Xz4fZ9dDmJg3KMntdvTnM2Kw3ewWV9oIIxPWTK5hcS4saA8XRPf3DnAqaPYZ C5JRvbjfQNPrv3zThBk9m4EHhTFNd3ht5GL5Cwd2M7ofxSCsltXTyILe8btD2tWB kBAVMLRGqtA42xGqa5aSvqcnILAMCQWXQxLkM6RWc6dGjTeXwt6k8R8mxGLwbXE7 Hcfq12lEqUL1Q+uQnnqXJJMxOVwOBeAJW8gCtl0l4Gg1TVhqdxROVZZ9VODALh5d AZzEgSx5s9XnIduV/f4OKZIw9EoD+nmawlSZrR2737M/bWWv/JjZtAPmLgjrKeVV UQct5FKG7t5MurIFjZAuQwtMoHKs4ZjVContjNQBzgmM+dgwXHHWeHI3ua0NbZTq w/Co8/Ui/saz3rlERsKrf4QXkgwkq3tXAPXQ6KHaiP1wz5qKS1vteaNSNHRr9xpL FYJeu1Ey5BWXkA2D4qOSHPCRsbY2uQEs+zsJGwDanXi0x2nP8EvpFi3++Uoi6Yxg AmlLwICrMS4hfQfXpCQ6K78RrRvBC7vaRQBx9/Omrb+E0EEeY9mM8wEkDuknoFsm negzwYS+ZZBBZPzB1fDKQTd3prW4Sx5L/ApskrorzvUf/fZv7wM= =ZQ8x -----END PGP SIGNATURE----- --------------tVq47CKzwy31DyqeF3DRxoBq--