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Wed, 19 Feb 2025 20:38:52 +0000 From: Brian Mak To: Kees Cook CC: Jan Kara , Michael Stapelberg , Christian Brauner , "Eric W. Biederman" , "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , Oleg Nesterov , Linus Torvalds , Alexander Viro Subject: Re: [PATCH v3] binfmt_elf: Dump smaller VMAs first in ELF cores Thread-Topic: [PATCH v3] binfmt_elf: Dump smaller VMAs first in ELF cores Thread-Index: AQHa6Cyyr+Pv/zK/REOrOTMOkQf+lLNN9PkAgAC4SgCAAVa2gIAAOzWAgAAM/oA= Date: Wed, 19 Feb 2025 20:38:51 +0000 Message-ID: References: <036CD6AE-C560-4FC7-9B02-ADD08E380DC9@juniper.net> <20250218085407.61126-1-michael@stapelberg.de> <39FC2866-DFF3-43C9-9D40-E8FF30A218BD@juniper.net> <202502191134.CC80931AC9@keescook> In-Reply-To: <202502191134.CC80931AC9@keescook> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: BYAPR05MB5799:EE_|SJ0PR05MB7788:EE_ x-ms-office365-filtering-correlation-id: 8900679b-8c83-4b94-1d27-08dd51256bc2 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|366016|38070700018; 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Updating the kernel breaks > elftools, which isn't some weird custom corner case. :P >=20 > So, while it took a few months, here is a report of breakage that I said > we'd need to watch for[1]. :) >=20 > Is anyone able to test this patch? And Brian will setting a sysctl be > okay for your use-case? Hi Kees, Yes, a sysctl tunable would be good here. I can test this patch in the next day or two. I will also scratch up a patch to bring us back into compliance with the ELF specifications, and see if that fixes the userspace breakage with elfutils, while not breaking gdb or rr. Thanks, Brian