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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-723a855c00esm53569677b3.59.2025.09.08.11.12.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Sep 2025 11:12:12 -0700 (PDT) Message-ID: Date: Mon, 8 Sep 2025 14:12:08 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 11/20] Add /dev/fd and /dev/std* To: Alyssa Ross References: <20250904-systemd-v1-0-2a63b790a913@gmail.com> <20250904-systemd-v1-11-2a63b790a913@gmail.com> <87h5xdjo9p.fsf@alyssa.is> Content-Language: en-US From: Demi Marie Obenour 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: <87h5xdjo9p.fsf@alyssa.is> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------FoLuYDamPie0Y0KF42Xk0NQG" Message-ID-Hash: QE4UTPK46CK52FHECYG5WIJAF2TT44G7 X-Message-ID-Hash: QE4UTPK46CK52FHECYG5WIJAF2TT44G7 X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; 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; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Spectrum OS Development X-Mailman-Version: 3.3.9 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) --------------FoLuYDamPie0Y0KF42Xk0NQG Content-Type: multipart/mixed; boundary="------------HrHRbkCVEyHKZbuZMKVkX5h0"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross Cc: Spectrum OS Development Message-ID: Subject: Re: [PATCH 11/20] Add /dev/fd and /dev/std* References: <20250904-systemd-v1-0-2a63b790a913@gmail.com> <20250904-systemd-v1-11-2a63b790a913@gmail.com> <87h5xdjo9p.fsf@alyssa.is> In-Reply-To: <87h5xdjo9p.fsf@alyssa.is> --------------HrHRbkCVEyHKZbuZMKVkX5h0 Content-Type: multipart/mixed; boundary="------------roWtGZgHdmZ3dyUkEJFJmT2f" --------------roWtGZgHdmZ3dyUkEJFJmT2f Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 9/8/25 05:18, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> This is the same as 14483e1a690c (img/app: add /dev/fd and /dev/std*),= >> but for the host and for vm/sys/net. While only Spectrum-provided cod= e >> should run in these VMs, third-party dependencies of Spectrum might >> assume these links exist, and them being missing could cause severe >> bugs. For instance, code writing to /dev/stdout could create a file i= n >> /dev rather than actually writing to stdout. >> >> In the host, the links are added in the initramfs. Since /dev is >> created by the kernel and moved (via mount --move) from the initramfs = to >> the main system, adding the links in the main system is not necessary >> and in fact would fail. >> >> Also reorder the moving of /sys, /proc, and /dev from the initramfs to= >> the root filesystem to minimize the time that /dev and /proc are not >> mounted. /proc is considered more important than /dev. >> >> Signed-off-by: Demi Marie Obenour >=20 > This is really two independent patches in one as well. Will fix. >> --- >> host/initramfs/etc/init | 7 ++++++- >> vm/sys/net/etc/s6-linux-init/scripts/rc.init | 5 +++++ >> 2 files changed, 11 insertions(+), 1 deletion(-) >> >> diff --git a/host/initramfs/etc/init b/host/initramfs/etc/init >> index 719488741b6d31564c2c17c0e41f15d16b1c0a08..b72108ab96630e2a846063= 551772b0b29ca27bdf 100755 >> --- a/host/initramfs/etc/init >> +++ b/host/initramfs/etc/init >> @@ -6,6 +6,11 @@ export PATH /bin >> =20 >> if { mount -a } >> =20 >> +if { ln -s /proc/self/fd /dev } >> +if { ln -s /proc/self/fd/0 /dev/stdin } >> +if { ln -s /proc/self/fd/1 /dev/stdout } >> +if { ln -s /proc/self/fd/2 /dev/stderr } >> + >=20 > Would prefer to do this in host/rootfs, in the interest of not creating= > more implicit requirements on initramfs in that system. initramfs is > deterministic enough that it's vanishingly unlikely we'll find that it > requires these only sometimes. Is there a plan to run Spectrum OS without an initramfs? If not, then adding these can only help and cannot hurt. >> piperw 3 4 >> if { fdmove 1 4 /etc/getuuids } >> fdclose 4 >> @@ -45,9 +50,9 @@ background { rm /dev/rootfs /dev/verity } >> if { mount /dev/mapper/root-verity /mnt/root } >> wait { $mdevd_pid } >> =20 >> -if { mount --move /proc /mnt/root/proc } >> if { mount --move /sys /mnt/root/sys } >> if { mount --move /dev /mnt/root/dev } >> +if { mount --move /proc /mnt/root/proc } >=20 > I don't understand this. There are no other processes running, so how > could the order possibly matter? There's nothing to race against. Does Busybox switch_root already move these mounts? I know util-linux switch_root does. >> switch_root /mnt/root >> /etc/init >> diff --git a/vm/sys/net/etc/s6-linux-init/scripts/rc.init b/vm/sys/net= /etc/s6-linux-init/scripts/rc.init >> index 1016d0c62bc6103bc9e865a389f5d482ef6c2b76..eaf037ec123afcaeafced9= 3096c4f35c2388f385 100755 >> --- a/vm/sys/net/etc/s6-linux-init/scripts/rc.init >> +++ b/vm/sys/net/etc/s6-linux-init/scripts/rc.init >> @@ -2,6 +2,11 @@ >> # SPDX-License-Identifier: EUPL-1.2+ >> # SPDX-FileCopyrightText: 2020-2022 Alyssa Ross >> =20 >> +if { ln -s /proc/self/fd /dev } >> +if { ln -s /proc/self/fd/0 /dev/stdin } >> +if { ln -s /proc/self/fd/1 /dev/stdout } >> +if { ln -s /proc/self/fd/2 /dev/stderr } >> + >> if { s6-rc-init -c /etc/s6-rc /run/service } >> =20 >> if { mkdir -p /dev/pts /dev/shm } >> >> --=20 >> 2.51.0 --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------roWtGZgHdmZ3dyUkEJFJmT2f Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; 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