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[69.131.146.178]) by smtp.gmail.com with ESMTPSA id 00721157ae682-78fb4378372sm158708357b3.12.2026.01.02.10.37.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 02 Jan 2026 10:37:33 -0800 (PST) Message-ID: <64484ab4-e137-4fd9-9441-a63ccdff1616@gmail.com> Date: Fri, 2 Jan 2026 13:37:14 -0500 Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 0/5] landlock: Pathname-based UNIX connect() control To: =?UTF-8?Q?G=C3=BCnther_Noack?= Cc: Tingmao Wang , =?UTF-8?Q?Micka=C3=ABl_Sala=C3=BCn?= , Paul Moore , linux-security-module@vger.kernel.org, Justin Suess , Samasth Norway Ananda , Matthieu Buffet , Mikhail Ivanov , konstantin.meskhidze@huawei.com, Alyssa Ross , Jann Horn , Tahera Fahimi References: <20260101134102.25938-1-gnoack3000@gmail.com> <61a6be66-a9bd-4d68-98ed-29aac65b7dfb@gmail.com> <73c5509a-5daa-4ea5-ab9f-e24a59786f6d@maowtm.org> <1d36b2ee-b967-42d7-a6c2-e5b1602a512f@gmail.com> <20260102.93e0d7b9c9b5@gnoack.org> <81f908e3-8a98-46e7-b20c-fe647784ceb4@gmail.com> <20260102.17e1c2b9faa4@gnoack.org> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------SS0ylbsHn5Saq5G0rrAf09K7" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------SS0ylbsHn5Saq5G0rrAf09K7 Content-Type: multipart/mixed; boundary="------------kw6AT0XxQpIQYV6zAZSPeUPH"; protected-headers="v1" Message-ID: <64484ab4-e137-4fd9-9441-a63ccdff1616@gmail.com> Date: Fri, 2 Jan 2026 13:37:14 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 0/5] landlock: Pathname-based UNIX connect() control To: =?UTF-8?Q?G=C3=BCnther_Noack?= Cc: Tingmao Wang , =?UTF-8?Q?Micka=C3=ABl_Sala=C3=BCn?= , Paul Moore , linux-security-module@vger.kernel.org, Justin Suess , Samasth Norway Ananda , Matthieu Buffet , Mikhail Ivanov , konstantin.meskhidze@huawei.com, Alyssa Ross , Jann Horn , Tahera Fahimi References: <20260101134102.25938-1-gnoack3000@gmail.com> <61a6be66-a9bd-4d68-98ed-29aac65b7dfb@gmail.com> <73c5509a-5daa-4ea5-ab9f-e24a59786f6d@maowtm.org> <1d36b2ee-b967-42d7-a6c2-e5b1602a512f@gmail.com> <20260102.93e0d7b9c9b5@gnoack.org> <81f908e3-8a98-46e7-b20c-fe647784ceb4@gmail.com> <20260102.17e1c2b9faa4@gnoack.org> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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boundary="------------ZaFPy1Y9l5em539N8PPd7eBR" --------------ZaFPy1Y9l5em539N8PPd7eBR Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 1/2/26 05:50, G=C3=BCnther Noack wrote: > On Fri, Jan 02, 2026 at 05:27:40AM -0500, Demi Marie Obenour wrote: >> On 1/2/26 05:16, G=C3=BCnther Noack wrote: >>> On Thu, Jan 01, 2026 at 05:44:51PM -0500, Demi Marie Obenour wrote: >>>> On 1/1/26 17:34, Tingmao Wang wrote: >>>>> On 1/1/26 22:14, Demi Marie Obenour wrote: >>>>>> [...] >>>>>> Does this leave directory traversal as the only missing Landlock >>>>>> filesystem access control? Ideally Landlock could provide the sam= e >>>>>> isolation from the filesystem that mount namespaces do. >>>>> >>>>> I think that level of isolation would require path walk control - s= ee: >>>>> https://github.com/landlock-lsm/linux/issues/9 >>>>> >>>>> (Landlock also doesn't currently control some metadata operations -= see >>>>> the warning at the end of the "Filesystem flags" section in [1]) >>>>> >>>>> [1]: https://docs.kernel.org/6.18/userspace-api/landlock.html#files= ystem-flags >>>> >>>> Could this replace all of the existing hooks? >>> >>> If you do not need to distinguish between the different operations >>> which Landlock offers access rights for, but you only want to limit >>> the visibility of directory hierarchies in the file system, then yes,= >>> the path walk control described in issue 9 would be sufficient and a >>> more complete control. >>> >>> The path walk control is probably among the more difficult Landlock >>> feature requests. A simple implementation would be easy to implement= >>> technically, but it also requires a new LSM hook which will have to >>> get called *during* path lookup, and we'd have to make sure that the >>> performance impact stays in check. Path lookup is after all a very >>> central facility in a OS kernel. >> >> What about instead using the inode-based hooks for directory searching= ? >> SELinux can already restrict that. >=20 > Oh, thanks, good pointer! I was under the impression that this didn't > exist yet -- I assume you are referring to the > security_inode_follow_link() hook, which is already happening during > path resolution? I'm not familiar with existing LSM hooks, but I do know that SELinux enforces checks on searching and reading directories and symlinks. > I take it back then. :) If there is prior art, implementing this might > be more feasible than I thought. I think so too! --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------ZaFPy1Y9l5em539N8PPd7eBR 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 6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 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