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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-765c62a0261sm13634057b3.39.2025.09.26.16.58.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Sep 2025 16:58:09 -0700 (PDT) Message-ID: <2a3b72a8-6604-4c7e-a9b1-0c770efb29c6@gmail.com> Date: Fri, 26 Sep 2025 19:58:05 -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 From: Demi Marie Obenour Subject: Re: [PATCH] kernel: Prevent prctl(PR_SET_PDEATHSIG) from racing with parent process exit To: Mateusz Guzik , Oleg Nesterov Cc: Andrew Morton , Christian Brauner , Linux kernel mailing list References: <20250913-fix-prctl-pdeathsig-race-v1-1-44e2eb426fe9@gmail.com> <20250922154819.c3049158ca006e1561ff5dcb@linux-foundation.org> <20250923120344.GA12377@redhat.com> <20250925162759.GA25838@redhat.com> Content-Language: en-US In-Reply-To: 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 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------42WYFkT7i0d66NaNSe46OccJ" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------42WYFkT7i0d66NaNSe46OccJ Content-Type: multipart/mixed; boundary="------------iz20MbFXBZav8aOUAiWezlyR"; protected-headers="v1" From: Demi Marie Obenour To: Mateusz Guzik , Oleg Nesterov Cc: Andrew Morton , Christian Brauner , Linux kernel mailing list Message-ID: <2a3b72a8-6604-4c7e-a9b1-0c770efb29c6@gmail.com> Subject: Re: [PATCH] kernel: Prevent prctl(PR_SET_PDEATHSIG) from racing with parent process exit References: <20250913-fix-prctl-pdeathsig-race-v1-1-44e2eb426fe9@gmail.com> <20250922154819.c3049158ca006e1561ff5dcb@linux-foundation.org> <20250923120344.GA12377@redhat.com> <20250925162759.GA25838@redhat.com> In-Reply-To: --------------iz20MbFXBZav8aOUAiWezlyR Content-Type: multipart/mixed; boundary="------------toAEC50Xr9heVyAbKyoMMOOs" --------------toAEC50Xr9heVyAbKyoMMOOs Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 9/25/25 14:35, Mateusz Guzik wrote: > It struck me that this mail thread is perhaps a little rude towards > Demi, so I would like to state the reported race is legitimate and if > it was reported against come core functionality it would count as > "good spotting". It just so happens this is a corner case to something > not-that-imporant and the proposed fix is rather heavy-weight (despite > being perfectly sensible), so there is quite a bit of reluctance. That makes sense. Thank you! My personal thought is that prctl(PR_SET_DEATHSIG) is rather rare, and also the lock is not held very long. In particular, exit already takes tasklist_lock for writing, and that is much more common. Therefore, I would be shocked if this added any significant contention outside of contrived benchmarks. What I _am_ concerned about is potential starvation, especially on PREEMPT_RT. Per the documentation: > - Because an rwlock_t writer cannot grant its priority to multiple > readers, a preempted low-priority reader will continue holding its lo= ck, > thus starving even high-priority writers. This allows any user to hammer tasklist_lock at will. Is that going to be a problem? > With that out of the way... >=20 > On Thu, Sep 25, 2025 at 6:29=E2=80=AFPM Oleg Nesterov = wrote: >>> That's very >>> nasty as the full fence is quite expensive. >> >> Well, the exit_notify() path is already heavy, not sure smp_mb() or >> smp_store_mb(real_parent, reaper) can add a noticeable difference. >> >=20 > Well the tasklist consumers already suffer a lot of avoidable > overhead, but I'm going to save the spiel about it. Maybe instead I > will post a patch to remove some. ;) >=20 > I realized I never checked how often processes are exiting while still > having children -- for legitimate workloads this is probably not that > common either, so the fence would not even show up in typical usage? >=20 > This could be answered with bpftrace over a bunch of workloads if > someone cares to investigate. Starvation on PREEMPT_RT is my only concern. See above. >>> I don't know if makes any sense to add this. >> >> Neither me. >> >> OK. I won't argue with this patch. At least the usage of tasklist_lock= is well >> documented. >> >=20 > ye.. avoiding smp_mb may be a case of "premature optimization", except > it is also simpler, so that's a really tough call. good news is that > it's not mine to make ;-) >=20 > I guess if the lock acquire goes in the sky is not going to fall, > worst case this can get revisited later. So fwiw I would be leaning > towards accepting the patch as well for the time being. Thank you! --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------toAEC50Xr9heVyAbKyoMMOOs 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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