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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-77f81c35b2csm19444457b3.24.2025.10.03.10.09.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Oct 2025 10:09:32 -0700 (PDT) Message-ID: Date: Fri, 3 Oct 2025 13:09:27 -0400 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: PID namespace init releases its file locks before its children die To: Oleg Nesterov , Christian Brauner , Mateusz Guzik Cc: Linux kernel mailing list , Andrew Morton References: <58ac5d49-14a9-4fe6-a5a4-746d6b73f82b@gmail.com> <20251003123828.GA26441@redhat.com> 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: <20251003123828.GA26441@redhat.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------LjtBRAhMTH0VBtUiOrJ6LmPr" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------LjtBRAhMTH0VBtUiOrJ6LmPr Content-Type: multipart/mixed; boundary="------------Rzg294RZohOJmUzVDDMmW98T"; protected-headers="v1" From: Demi Marie Obenour To: Oleg Nesterov , Christian Brauner , Mateusz Guzik Cc: Linux kernel mailing list , Andrew Morton Message-ID: Subject: Re: PID namespace init releases its file locks before its children die References: <58ac5d49-14a9-4fe6-a5a4-746d6b73f82b@gmail.com> <20251003123828.GA26441@redhat.com> In-Reply-To: <20251003123828.GA26441@redhat.com> --------------Rzg294RZohOJmUzVDDMmW98T Content-Type: multipart/mixed; boundary="------------K4eUcvqJ69fl0LDkZVsNmpET" --------------K4eUcvqJ69fl0LDkZVsNmpET Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 10/3/25 08:38, Oleg Nesterov wrote: > Add CCs. >=20 > I can't really help, just my 2 cents... >=20 > I don't think we can change do_exit() to call exit_files() after > exit_notify(). Not surprised. > At first glance, technically it is possible to change do_exit() so > that the exiting reaper does zap_pid_ns_processes() earlier... But > even if this is possible, I think that this complication needs more > justification. I have a service that must not be run more than once concurrently. I'm using s6 [1] as the service manager. s6 doesn't support cgroups, but it does support running the child in a PID namespace. I was hoping that if the init process in the PID namespace took an exclusive file lock, it would ensure that all the children in the PID namespace stopped running before the lock is released. Unfortunately, with the current implementation that is not the case. Right now, I'm leaking the file descriptor into the child processes and relying on them to not close it. This is somewhat fragile, though. For instance, anything using GSubprocess breaks this assumption. GSubprocess closes all file descriptors not explicitly passed into the child. It is definitely possible to implement this with cgroups: wait for the cgroup to become empty before spawning the child. It is also possible for the supervisor to ensure that the child is dead before spawning a new one, though s6's architecture makes this non-trivial. The parent of the child is not PID 1, so it would need to inform PID 1 to kill the child (and wait for it) if the actual supervisor dies. > Oleg. >=20 > On 10/02, Demi Marie Obenour wrote: >> >> I noticed that PID 1 in a PID namespace can release file locks (due >> to exiting) while its children are still running for a bit. If the >> locks held by PID 1 were relied to serialize the execution of its >> child processes, this could result in data corruption. >> >> Specifically, the child processes are killed via exit_notify() -> >> forget_original_parent() -> find_child_reaper() -> >> zap_pid_ns_processes(). That comes *after* exit_files(), which >> releases the file locks. >> >> While it is possible to implement this with cgroups, cgroups >> are quite a bit more complicated to use, at least compared to >> a single call to unshare() before fork(). >> >> Is this intentional? Changing the behavior would make supervision >> trees significantly easier to properly implement. >> -- >> Sincerely, >> Demi Marie Obenour (she/her/hers) >=20 --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------K4eUcvqJ69fl0LDkZVsNmpET 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 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Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmjgA0gACgkQszaHOrMp 8lNCvhAAkj6oSe2aUrdvBGs77oz247hPDG/Psdqeu8dB3h9Ix1hpJbeGRjnsvDYS 7dONlr3PRbqKgLYWp4VJkkIYj3bLtweWVzgHXIkMxfHKCzD5jc9Dm9nSgiBtv4Q9 J2wYFN5tQqheIjJM2PzNn03KplADed6n9EsYd1oOf5xfKe6NueyyBOVhCUAaQFF+ qO3gDUEwvdNkX2pFG6iEpa4DcOsgFFnkkwyS7sesgpd5YvdmfltNSOaI6GLBFKfl Kp5ZomU1Rrx3iLxrHd7MVsmsf1daBh1hWu5fozxn8y2SczMWntBTPNEAITMNlEjR +hq1zcSQQxFyhbEEaMHdpdq5brHVsgXLmJW76RYKLJnFu9Md2jiV6D6MDujjmFG4 xeOs9RUjYFa7UpNZUCBPHRT/kOjxfHI0J5igvZlZ7sk/WUUNGEx+roggkcFiySoX hv2n858vhQd1R91XenxM/Wu3qVOnbCjA8Y6HBoeZ32Rf/inh0cWT0OcCnI+w+g8H mLeENyqnl9xlvk2ym+hQhX9C38f8X2/LyKRpllTNFcwlCofpNPNnn+VXf4ocq/VH qR5Oa2Ba6ZGUnmQay4GbkOVWADqsgMw+utXM8v8xyVhXvRrDcgnyJfOX/z/NZTrz BsZtYcQkOqbc27UvgSL/HOl985AJwx7x9occZ3YIBVuTKQtXL58= =G36/ -----END PGP SIGNATURE----- --------------LjtBRAhMTH0VBtUiOrJ6LmPr--