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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-63f96a50f2esm1478060d50.15.2025.11.01.11.36.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 01 Nov 2025 11:36:38 -0700 (PDT) Message-ID: <831ecec1-d782-4fab-a6d5-40eae0f9ad92@gmail.com> Date: Sat, 1 Nov 2025 14:36:34 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/7] tools: Add directory checker for updates To: Alyssa Ross References: <20251029-updates-v1-0-401c1be2a11b@gmail.com> <20251029-updates-v1-3-401c1be2a11b@gmail.com> <87sef1kjbk.fsf@alyssa.is> <72921587-e951-4bfb-b68e-5cb05fc32609@gmail.com> <87bjlmq756.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: <87bjlmq756.fsf@alyssa.is> Content-Type: multipart/signed; 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boundary="------------bVFkrfnjsnwiYNpdT8YpSo6c"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross Cc: Spectrum OS Development Message-ID: <831ecec1-d782-4fab-a6d5-40eae0f9ad92@gmail.com> Subject: Re: [PATCH 3/7] tools: Add directory checker for updates References: <20251029-updates-v1-0-401c1be2a11b@gmail.com> <20251029-updates-v1-3-401c1be2a11b@gmail.com> <87sef1kjbk.fsf@alyssa.is> <72921587-e951-4bfb-b68e-5cb05fc32609@gmail.com> <87bjlmq756.fsf@alyssa.is> In-Reply-To: <87bjlmq756.fsf@alyssa.is> Autocrypt-Gossip: addr=hi@alyssa.is; keydata= xsFNBFpSgoYBEAC4xkCYidG2JlRWulUkTWcx0pHFDf3oSbb6Q872Kb3iDChWgluNVz43hva1 3xfDo9foV0GoyfGl/ycSCkXX5hlQr7ir/5FN38E7H/yY6tH8+l68iDgIOcb1qY0OYaxyg+Lz WesfFQedrmwNTbF4L1BtWzrTR5PflDdhDo5VWSguHGJFSclchcr/6UmMb/gOUN+2ElBC2TE2 EKY099phZ6DJZ2aZCsclwKIdCpZzXlEmXPAeaH5om6xo90JYv5+sFji40R0Plqec3WC+jTxy lGca6IbPdOminuUF+GvsR86eVsgh/0XNK7/zus7gyc4PuMUA1rCoeHcWOBDPgmelgCQyJGXd /bXeKuUsGoge58uc7/YNvOh1vfpD3AaEMqAyXfmmUwBnIicml74+2eOpH3Oljfs01g+DhkOB MtpVSZSgaIDvP0WG6cbAxImoUasnmNxEDNskfVmI8bsajPW9bt4z5hiP5Q9G3vE0D5HcIFdM adOz81PpOwNiUXcjtYV1PWZQ56jbSTOf8EBvsB71WwB+XgVWcPzIlY8hAykiHIO87oV3o71U JTAn1Foj7mjSADnY0deleOmar/K5jrK3wvKKM1XlB7PXcGBdkorJC+cbxVsw0ADzMw0c7bVc wEE7OFvHjQiIK1lO+lb1cvGBBY3IZxjsjZdA/VsFHFdAeYlzNQARAQABzRpBbHlzc2EgUm9z cyA8aGlAYWx5c3NhLmlzPsLBlwQTAQgAQQIbAwULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAIZ ARYhBHVzVtd5u7iIdz5BXnNszfnvUb2XBQJoh9HmBQkOtoJgAAoJEHNszfnvUb2XFxAP/jF7 Rxuspytz7VwOA/y5WQe/FdPNRvyRUzj66ZzfuaG++md14LWcrvbb2hHLdS5ePdKoOaqC3xhK Ncy/5RVd4pD5N4AY7O5228JKDO8GGWEl3rupOCmYQL9P8GpsdGt2xkFqbu4HrFzMTzl6nvKN GtvhBSCkAW3v7wTwPf2rkjX8f+clmRZn4YLfojaBCT/ZFjmJkQSWZ+2rUZOxjgZgckLkplu8 LVILVdaHNLkOrxbKQLuuVyEkN+/YrshyJP4a7Z/Tnw+3eZcaLuLOxBHpWOAAgJZ8kL+V7BxK DlTywv/OOr0CoNi9zjH3VgRiJ1961K/DocjA50pWBilMUs4jGp9omhkAOwdNV2hi+Zj/GXaD kgvBlE313DGWzgW0RauL8j5/GULgphwm5UOHXb/5yM9pRw87kfQ/+zQuHpguoXSGkUv0kSID 88kUGlNxy1kkTsSYG2UTKLmLDPuUGOUDGaNUzD+J49MogSLTmvHUIYNs0jFmpLyhVoTtSi/I VQQpHyk9ucAZd2OLxChm3RBJhAbmGw3rhUxx6B8SHwcBcJDttGyYF2GZj9AYAGlU/Fm1Itoi NwJD0vQnSZ//25l+XJehpeeixsqydj00gksHWEFaIEgCYyC6JfmGS4HtuUcv76vc2vLCv5aH hJVHHKGs+kiKJ2+r7bCNwvW0doVePdByzjgEZyd/yxIKKwYBBAGXVQEFAQEHQCVxoiHOlsEo NDKGCbxg4nL3E1CV0MRQCU1hPowd77h3AwEIB8LBfAQYAQoAJgIbDBYhBHVzVtd5u7iIdz5B XnNszfnvUb2XBQJoh9HXBQkB4YUCAAoJEHNszfnvUb2XgvAP+gIIKR3KatmwuUcla1RN6tUc 0Ae9eqS1cbSEDj8a14fnvUHtlCEO5g4m2PvPn7L2o7047ppl5100+zGMocXWslnDFJJVeAOp xzlhZ48DFMxkZkjtLY2fRrj1tOtzrTRikV0/UsaVs9tMPMEsVu/FH0exMoNELcqEVUgcRRpd XYXC9zgDUcM4+JRH8hDOiC51JRvdkXcokAXphuCY3J996i8Ph+kg6xMqscePscvvltR68jcT HHDOiOQtzjJRKQ6BHUzYdIRixcq210sabfZGJVT+7BfHI5qiUwfoG3DXSJygviN3I/EfnSbD 6T0Ccv/G6wQPHO4Vyn+egrMOU/HUrCKuq/b0rYvI8pTtRWAxIHkFZoKVB8I8Rl8+riGiEUAh Ja0bU4iOg7vR5Bm8Gt/tR6KjClyBI5NN1M1haFgVXqZ3dsQDpBjivbDHbUsAXVsd00y0B4Ir 8muvII9eJOwbTyqcG9RJbflquPp+FPlgiy9pYj52PB0NwzLYqX0fOWU8IqQF3bWtdJIb4Zat XnfqYtJ/wCaJTU43N3+/TIdqNA4G3WbyRYsCnz/kkf1ARmxoq3r29dOl8OnNHEvB1+hBlNBk d+cLpsYdTxa63OpbNDpm/unX1sEpOYy04dL5Y8B1Xbh+rQFNySq4Ani2dl5N1OsrjgzZ+wkl k2wOTWzl7wFH --------------bVFkrfnjsnwiYNpdT8YpSo6c Content-Type: multipart/mixed; boundary="------------qDZNyw6nbEBGTb2NiGMcciGV" --------------qDZNyw6nbEBGTb2NiGMcciGV Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 11/1/25 08:17, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> On 10/29/25 08:01, Alyssa Ross wrote: >>> Demi Marie Obenour writes: >>> >>>> Spectrum OS's host has no network access. Updates must be downloade= d by >>>> VMs. The downloads are placed into a bind-mounted directory. The V= M >>>> can write whatever it wants into that directory. This includes syml= inks >>>> that subsequent code might open, which would create a path traversal= >>>> vulnerability. It also includes paths with names containing contain= ing >>>> terminal escape sequences, newlines, or other nastiness. Furthermor= e, >>>> the directory should not have any subdirectories either. >>>> >>>> Add a simple C program that checks for such ugliness and indicates >>>> (via its exit code) if the VM misbehaved. It also ensures that both= >>>> SHA256SUMS and SHA256SUMS.gpg are present. >>>> >>>> Signed-off-by: Demi Marie Obenour >>>> --- >>>> host/rootfs/Makefile | 6 +- >>>> lib/kcmdline-utils.mk | 6 ++ >>>> tools/default.nix | 1 + >>>> tools/meson.build | 1 + >>>> tools/updates-dir-check/meson.build | 4 ++ >>>> tools/updates-dir-check/updates-dir-check.c | 94 ++++++++++++++++++= +++++++++++ >>>> 6 files changed, 110 insertions(+), 2 deletions(-) >>> >>> I still don't really understand why this needs to be a C program inst= ead >>> of find -H /path/to/dir -not -type f. None of the other checks seem >>> very necessary? >> >> I trust this code more than I trust (especially) the Busybox >> implementation of find. >=20 > This doesn't really make sense to me. All of this is quite trivial fin= d > behaviour =E2=80=94 not the sort of thing that's unlikely to have been = widely > tested. No objection to GNU find though if it helps. I see: find with a -exec false to return an error if anything matching is found? I'm way more familiar with C than with find, which is why I missed this. >>> How are -Werror=3Dpedantic and -DNDEBUG getting enabled in the first = place? >> >> I believe Meson sets -DNDEBUG in some cases. >=20 > Yes, if the user explicitly asks for it. I thought it was default for release builds. >>>> + if (entry->d_name[0] =3D=3D '.') >>>> + if (len =3D=3D 1 || (len =3D=3D 2 && entry->d_name[1] =3D=3D '.'= )) >>>> + continue; >>>> + if (strcmp(entry->d_name, "SHA256SUMS") =3D=3D 0) { >>>> + found_sha256sums =3D true; >>>> + continue; >>>> + } >>>> + if (strcmp(entry->d_name, "SHA256SUMS.gpg") =3D=3D 0) { >>>> + found_sha256sums_gpg =3D true; >>>> + continue; >>>> + } >>>> + unsigned char c =3D (unsigned char)entry->d_name[0]; >>>> + if (!((c >=3D 'A' && c <=3D 'Z') || >>>> + (c >=3D 'a' && c <=3D 'z'))) >>>> + errx(1, "Filename must begin with an ASCII letter"); >>>> + for (size_t i =3D 1; i < len; ++i) { >>>> + c =3D (unsigned char)entry->d_name[i]; >>>> + if (!((c >=3D 'A' && c <=3D 'Z') || >>>> + (c >=3D 'a' && c <=3D 'z') || >>>> + (c >=3D '0' && c <=3D '9') || >>>> + (c =3D=3D '_') || >>>> + (c =3D=3D '-') || >>>> + (c =3D=3D '.'))) { >>>> + if (c >=3D 0x20 && c <=3D 0x7E) >>>> + errx(1, "Forbidden subsequent character in filename: '%c'", (i= nt)c); >>>> + else >>>> + errx(1, "Forbidden subsequent character in filename: byte %d",= (int)c); >>>> + } >>>> + } >>> >>> Why do we care? Surely we don't expect systemd-sysupdate to put >>> filenames unescaped into a shell or something. >> >> Prevent escape sequence injection into terminals and logs is the >> main reason. Qubes OS has similar checks in some places, though they >> are off by default for file copying. >=20 > Doing this in a tool that's only used by sysupdate is a very ad-hoc way= > to protect against that. I think if we want to protect against that > sort of thing it should be done in one place, probably in virtiofsd. I think sysupdate is more likely to log unsanitized data, especially as systemd-journald has no problems with it. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------qDZNyw6nbEBGTb2NiGMcciGV 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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