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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------824L0rYfB0gKCiL8r0sHCuxv" Message-ID-Hash: RKHC6ICBPYZCDA4DSAXTI33PGHROFFYU X-Message-ID-Hash: RKHC6ICBPYZCDA4DSAXTI33PGHROFFYU X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-devel.spectrum-os.org-0; header-match-devel.spectrum-os.org-1; header-match-devel.spectrum-os.org-2; header-match-devel.spectrum-os.org-3; header-match-devel.spectrum-os.org-4; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Spectrum OS Development X-Mailman-Version: 3.3.10 Precedence: list List-Id: Patches and low-level development discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------824L0rYfB0gKCiL8r0sHCuxv Content-Type: multipart/mixed; boundary="------------7thVGpR0UiLRR89EXNm8YTMj"; protected-headers="v1" Message-ID: <17ab104b-e6a5-4b33-b941-25ba35bf9b0a@gmail.com> Date: Wed, 24 Jun 2026 23:03:05 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] Set up control groups for most services From: Demi Marie Obenour To: Alyssa Ross Cc: Spectrum OS Development References: <20260620-cgroups-v1-1-0e5abf35101b@gmail.com> <20260620-cgroups-v2-1-ccae224b6c85@gmail.com> <87qzlw5e65.fsf@alyssa.is> 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="------------n6pT0syptcobiK57wBybcBN5" --------------n6pT0syptcobiK57wBybcBN5 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 6/24/26 22:03, Demi Marie Obenour wrote: > On 6/24/26 08:13, Alyssa Ross wrote: >> Demi Marie Obenour writes: >> >>> The cgroups are handled by a Rust tool. The name of the cgroup is >>> autogenerated from the service name. >>> >>> Using cgroups for process control is not implemented yet. >>> >> >> Perhaps you could include some more details of how the cgroup hierarch= y >> is supposed to be set up and why, either in the patch body or in >> documentation? >=20 > Will fix in v3. >=20 >> As I understood it, the point of using cgroups was that we could bundl= e >> all services for a VM, including the VMM, into a single cgroup, but I >> don't see that here, just a pure translation of the service hierarchy >> (which the VMM might not even be part of). Are per-VM cgroups coming >> later? >=20 > I think it would be significantly simpler to have the VMM be > just another VM service. This would naturally put it under the > vm-services cgroup, solving this problem. Since this would mostly > involve changes to execline scripting, I think it would be better if > you wrote this code. >=20 >>> diff --git a/host/rootfs/image/etc/fstab b/host/rootfs/image/etc/fsta= b >>> index 18bb5e45abafeaf43871306ce8233239e5c07f76..d92364d83f4d26f766fcd= 5b494614c06a630d2fe 100644 >>> --- a/host/rootfs/image/etc/fstab >>> +++ b/host/rootfs/image/etc/fstab >>> @@ -6,3 +6,4 @@ tmpfs /dev/shm tmpfs nosuid,nodev 0 0 >>> tmpfs /media tmpfs nosuid,nodev,noexec,nosymfollow,mode=3D755 0 0 >>> sysfs /sys sysfs nosuid,nodev,noexec 0 0 >>> tmpfs /tmp tmpfs nosuid,nodev 0 0 >>> +cgroup2 /sys/fs/cgroup cgroup2 nosuid,nodev,noexec,nosymfollow 0 = 0 >> >> Alignment is off here. The rest of the file uses tabs at 8 characters= =2E >> (I know, I know, but it's traditional.) >> >>> diff --git a/host/rootfs/image/etc/s6-linux-init/run-image/service/se= rial-getty-generator/run b/host/rootfs/image/etc/s6-linux-init/run-image/= service/serial-getty-generator/run >>> index bf66ab0878fc6d8e77ca71a4a89e50c139a6bb11..5c9988c994ed9b9423290= 55673b332d0aa918957 100755 >>> --- a/host/rootfs/image/etc/s6-linux-init/run-image/service/serial-ge= tty-generator/run >>> +++ b/host/rootfs/image/etc/s6-linux-init/run-image/service/serial-ge= tty-generator/run >>> @@ -1,7 +1,8 @@ >>> -#!/bin/execlineb -WP >>> +#!/bin/execlineb -WS1 >>> # SPDX-License-Identifier: EUPL-1.2+ >>> # SPDX-FileCopyrightText: 2024-2025 Alyssa Ross >>> =20 >>> +cgroup-setup -- $1 >>> piperw 3 4 >>> background { >>> fdclose 3 >> >> What benefit does this cgroup provide? >=20 > None, I'll remove it. >=20 > The only requirement of the current code is that if a service is under > a cgroup, its parent should *also* be under a cgroup. Otherwise you > can get conflicting cgroup paths. >=20 >>> diff --git a/host/rootfs/image/etc/s6-linux-init/run-image/service/se= rial-getty/run b/host/rootfs/image/etc/s6-linux-init/run-image/service/se= rial-getty/run >>> index 78f794202bf174f3c036f3e20755ac087a988277..ed0808b9e45b077023f23= 7a0f9c0e5c830015ac2 100755 >>> --- a/host/rootfs/image/etc/s6-linux-init/run-image/service/serial-ge= tty/run >>> +++ b/host/rootfs/image/etc/s6-linux-init/run-image/service/serial-ge= tty/run >>> @@ -1,5 +1,6 @@ >>> -#!/bin/execlineb -WP >>> +#!/bin/execlineb -WS1 >>> # SPDX-License-Identifier: EUPL-1.2+ >>> # SPDX-FileCopyrightText: 2023 Alyssa Ross >>> =20 >>> +cgroup-setup -- $1 >>> s6-svscan -d3 instance >> >> We're putting supervisors of instances services in a cgroup? Can you >> explain to me why that's useful? >=20 > This allows configuring limits that apply to the whole instance, and > means that the whole instance can be reliably killed. Services spawned= > by the instance will be in their own sub-cgroups, so one can apply > separate limits to them so long as those limits do not exceed those > of the containing cgroup. >=20 > The hierarchy works like this: >=20 > /sys/fs/cgroup > service1.service > @inner.service # processes go here > service2.service > @inner.service # and here > service3.service > @inner.service # and here >=20 > You can apply resource limits at any level of the hierarchy. Limits in= > nested cgroups can be smaller but not larger. Terminating processes > in a cgroup with cgroup.kill also terminates all processes in child > cgroups. After terminating the processes in a cgroup, cgroup-setup > will delete everything in the hierarchy recursively. More generally: The design I implemented is based on a model where cgroups and services are very tightly coupled: most services have an associated cgroup and every cgroup is attached to a service. This is like systemd service units, except that it can be nested many layers deep. Since a VM may have many processes that serve it, this model requires that all of these processes be under a single service. In this case, that service would be the vm-services service. That said, I'm not sure which of these service, if any, should be automatically restarted if they crash. Automatic restart of services is actually very useful for attackers, as it lets them retry an exploit over and over until they get the memory layout they need for success. If you restart the VMM, you might as well restart every other service as well. Unless Cloud Hypervisor automatically reconnects to vhost-user devices (and I don't think it does), there's no point in restarting virtiofsd or crosvm without either re-adding the device or restarting the VMM. Even if you did re-add the device, I don't know if the guest would be able to recover. Without automatic restart, there's no real reason to use s6 to manage the per-VM services. s6 assumes you do want to restart services that crash. An alternative approach is to have cgroups be freestanding objects that exist independently of whether there are processes in them. This corresponds to systemd scope units. It's not hard to implement this: just disable automatic purging and pass the full path to the cgroup. But it requires each VM service to have identical resource limits, whereas one typically wants per-process limits. For instance, none of the services should be able to create child processes, and per-service cgroups make this easy: just set the maximum amount of processes in the cgroup to 1. Incidentally, this works very well with PID namespaces. One can have the "main" process of the service run in a PID namespace, and have all the others enter that namespace. 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