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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-723bd2cd669sm46843717b3.0.2025.09.08.10.16.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Sep 2025 10:16:27 -0700 (PDT) Message-ID: <27c017c6-42e7-4ca4-aae9-4cb5f4e8e216@gmail.com> Date: Mon, 8 Sep 2025 13:16:23 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 07/20] scripts/make-erofs.sh: Standardize file modes in images To: Alyssa Ross References: <20250904-systemd-v1-0-2a63b790a913@gmail.com> <20250904-systemd-v1-7-2a63b790a913@gmail.com> <87segxjpq5.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: <87segxjpq5.fsf@alyssa.is> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------1N27tJ8CZj00i2JoykAT4gSv" Message-ID-Hash: FPP7X74M2F4JNUTDSZZLQOVHJZALIRXD X-Message-ID-Hash: FPP7X74M2F4JNUTDSZZLQOVHJZALIRXD 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) --------------1N27tJ8CZj00i2JoykAT4gSv Content-Type: multipart/mixed; boundary="------------Mapj0FEHIqxECIavnmOqOXGb"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross Cc: Spectrum OS Development Message-ID: <27c017c6-42e7-4ca4-aae9-4cb5f4e8e216@gmail.com> Subject: Re: [PATCH 07/20] scripts/make-erofs.sh: Standardize file modes in images References: <20250904-systemd-v1-0-2a63b790a913@gmail.com> <20250904-systemd-v1-7-2a63b790a913@gmail.com> <87segxjpq5.fsf@alyssa.is> In-Reply-To: <87segxjpq5.fsf@alyssa.is> --------------Mapj0FEHIqxECIavnmOqOXGb Content-Type: multipart/mixed; boundary="------------d0oTsMT0ZeJXwPBGYVLAeHqM" --------------d0oTsMT0ZeJXwPBGYVLAeHqM Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 9/8/25 04:46, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> Enforce that anything under /var or /etc is 0755 for directories and >> executable files and 0644 for anything else. Enforce that anything el= se >> is 0555 for directories and executable files and 0444 for anything els= e. >> This avoids depending on factors that may depend on the build >> environment, such as the user's umask. >=20 >> diff --git a/scripts/make-erofs.sh b/scripts/make-erofs.sh >> index 66abd1f388524c19cd3a1113415892d0d72e3f82..d566a4ac7b30f55338fe9b= 8b6a94702686f6ddd1 100755 >> --- a/scripts/make-erofs.sh >> +++ b/scripts/make-erofs.sh >> @@ -95,4 +95,25 @@ while read -r arg1; do >> cp -RT -- "$arg1" "$root/$arg2" >> done >> =20 >> +# Ensure that the permissions in the image are independent >> +# of those in the git repository or Nix store, except for >> +# the executable bit. In particular, the mode of those >> +# outside the Nix store might depend on the user's umask. >> +# While the image itself is strictly read-only, it makes >> +# sense to populate an overlayfs over /etc and /var, and >> +# this overlayfs should be writable by root and readable >> +# by all users. The remaining paths should not be writable >> +# by anyone, but should be world-readable. >=20 > So I get why, given the overlayfs idea, it's important for /etc and /va= r > to not be user-writeable, but what I don't understand is: why aren't we= > checking permissions for other directories, like /bin or /lib? Other way around: /etc, /var, and /nix/store are skipped (via -prune -o) and the rest are checked. >> +find "$root" \ >> + -path "$root/nix/store" -prune -o \ >> + -path "$root/etc" -prune -o \ >> + -path "$root/var" -prune -o \ >> + -type l -o \ >> + -type d -a -perm 0555 -o \ >> + -type f -a -perm 0444 -o \ >> + -execdir chmod ugo-w,ugo+rX -- '{}' + >> +find "$root/etc" "$root/var" ! -type l -execdir chmod u+w,go-w,ugo+rX= -- '{}' + >> +chmod 0755 "$root" >> + >> +# Make the erofs image. >> mkfs.erofs -x-1 -b4096 --all-root "$@" "$root" >> >> --=20 >> 2.51.0 --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------d0oTsMT0ZeJXwPBGYVLAeHqM 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 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