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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-723a831fcc6sm54673507b3.16.2025.09.08.11.21.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Sep 2025 11:21:51 -0700 (PDT) Message-ID: <80ecbfb5-441e-4fc6-96ca-c765701ea523@gmail.com> Date: Mon, 8 Sep 2025 14:21:47 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 04/20] scripts/make-erofs.sh: Validate all paths To: Alyssa Ross References: <20250904-systemd-v1-0-2a63b790a913@gmail.com> <20250904-systemd-v1-4-2a63b790a913@gmail.com> <871pohl4rr.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: <871pohl4rr.fsf@alyssa.is> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------i4pmi1YJg3FAec92BmsiGbwx" Message-ID-Hash: MA5IXMPOEMSRO645HZRKPLHHD2AGCID2 X-Message-ID-Hash: MA5IXMPOEMSRO645HZRKPLHHD2AGCID2 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) --------------i4pmi1YJg3FAec92BmsiGbwx Content-Type: multipart/mixed; boundary="------------090bDsK7qrgczFJL8O0Lfrnc"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross Cc: Spectrum OS Development Message-ID: <80ecbfb5-441e-4fc6-96ca-c765701ea523@gmail.com> Subject: Re: [PATCH 04/20] scripts/make-erofs.sh: Validate all paths References: <20250904-systemd-v1-0-2a63b790a913@gmail.com> <20250904-systemd-v1-4-2a63b790a913@gmail.com> <871pohl4rr.fsf@alyssa.is> In-Reply-To: <871pohl4rr.fsf@alyssa.is> --------------090bDsK7qrgczFJL8O0Lfrnc Content-Type: multipart/mixed; boundary="------------yB0QsXK12Gs9pC0IzNk4Rgk0" --------------yB0QsXK12Gs9pC0IzNk4Rgk0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 9/8/25 04:36, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> This isn't a security feature as the input is trusted, but it might >> catch some bugs in the future. Additionally, it will allow replacing = an >> external command with builtin string manipulation, as paths that the >> builtin manipulation would mishandle will instead be rejected. >=20 > In general this feels a bit overkill to me, but it depends =E2=80=94 ha= ve you > encountered bugs this would help prevent? No, but it does make me more confident about omitting calls to an external dirname command, which should speed stuff up. >> Signed-off-by: Demi Marie Obenour >> --- >> scripts/make-erofs.sh | 31 +++++++++++++++++++++++++++++++ >> 1 file changed, 31 insertions(+) >> >> diff --git a/scripts/make-erofs.sh b/scripts/make-erofs.sh >> index e63bcbed9c3028f0f2b55431d46ba9ec67bc26ef..cf942972910c76e1835dc5= b0084c2d04bf084a9d 100755 >> --- a/scripts/make-erofs.sh >> +++ b/scripts/make-erofs.sh >> @@ -28,6 +28,34 @@ trap 'chmod -R +w -- "$root" && rm -rf -- "$superro= ot"' EXIT >> root=3D$superroot/real_root >> mkdir -- "$root" >> =20 >> +check_path () { >> + # Various code can only handle paths that do not end with / >> + # and are in canonical form. Reject others. >> + for i; do >> + case $i in >> + (''|.|..|./*|../*|*/|*/.|*/..|*//*|*/./*|*/../*) >> + printf 'Path "%s" is /, //, empty, or not canonical\n' "$i" >&2 >> + exit 1 >> + ;; >> + (*[!A-Za-z0-9._@+/-]*) >> + printf 'Path "%s" has forbidden characters\n' "$i" >&2 >> + exit 1 >> + ;; >=20 > Not sure why we'd want to rule out most characters? We're not really i= n > control of what characters packages choose to use in their store paths.= I believe Nix has an allowlist of permitted characters in store paths. Is this documented, or is it just in the C++ source code? >> + (-*) >> + printf 'Path "%s" begins with -\n' "$i" >&2 >> + exit 1 >> + ;; >> + (/nix/store/*|[!/]*) >=20 > It's technically possible to use Nix with a different store path, so I'= d > like to avoid anything that requires us to hardcode /nix/store. Right now, the generated images depend on the store paths, so the scripts would need to be adapted to support this. If we are going to generalize this, I recommend using a proper scripting language like Python, Perl, or Lua. >> + : >> + ;; >> + (*) >> + printf 'Path "%s" is neither relative nor a Nix store path\n' "$i"= >&2 >> + exit 1 >> + ;; >> + esac >> + done >> +} >> + >> while read -r arg1; do >> read -r arg2 || ex_usage >> =20 >> @@ -38,6 +66,7 @@ while read -r arg1; do >> echo >> =20 >> if [ "$arg2" =3D / ]; then >> + check_path "$arg1" >> cp -RT -- "$arg1" "$root" >> # Nix store paths are read-only, so fix up permissions >> # so that subsequent copies can write to directories >> @@ -47,6 +76,8 @@ while read -r arg1; do >> continue >> fi >> =20 >> + check_path "$arg1" "$arg2" >> + >> parent=3D$(dirname "$arg2") >> mkdir -p -- "$root/$parent" >> cp -RT -- "$arg1" "$root/$arg2" >> >> --=20 >> 2.51.0 --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------yB0QsXK12Gs9pC0IzNk4Rgk0 Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; 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