{"id":2235052,"url":"http://patchwork.ozlabs.org/api/1.2/covers/2235052/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/cover/20260508132211.3504357-1-yury.khrustalev@arm.com/","project":{"id":41,"url":"http://patchwork.ozlabs.org/api/1.2/projects/41/?format=json","name":"GNU C Library","link_name":"glibc","list_id":"libc-alpha.sourceware.org","list_email":"libc-alpha@sourceware.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260508132211.3504357-1-yury.khrustalev@arm.com>","list_archive_url":null,"date":"2026-05-08T13:22:08","name":"[0/3] Remove broken memory tagging in malloc","submitter":{"id":88214,"url":"http://patchwork.ozlabs.org/api/1.2/people/88214/?format=json","name":"Yury Khrustalev","email":"yury.khrustalev@arm.com"},"mbox":"http://patchwork.ozlabs.org/project/glibc/cover/20260508132211.3504357-1-yury.khrustalev@arm.com/mbox/","series":[{"id":503390,"url":"http://patchwork.ozlabs.org/api/1.2/series/503390/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/list/?series=503390","date":"2026-05-08T13:22:08","name":"Remove broken memory tagging in malloc","version":1,"mbox":"http://patchwork.ozlabs.org/series/503390/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/2235052/comments/","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","libc-alpha@sourceware.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","libc-alpha@sourceware.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=foss header.b=pLj69ogb;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=38.145.34.32; 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a=rsa-sha256; d=sourceware.org; s=key;\n t=1778246543; c=relaxed/simple;\n bh=TOYoqfwp5xFRd6/pnLZHbBTLPoYeI6wFJenwN7HI1Ok=;\n h=DKIM-Signature:From:To:Subject:Date:Message-ID:MIME-Version;\n b=JxDA+q7YJEv4fhE+vtPQcJWBk/4Umme2CDBqtygZCvuM6iCWbkIYuH2wEW7Zyulypztf5JHQymqb6WYVRg5xx78P2WvFN9V2KBH7SyY1yyWjMkWjZGiyxxtyDMS8rN6lFZYg8K+JTWdfKkvPGwBYWCjO3jtg30Hvv1aqhuJl0G4=","ARC-Authentication-Results":"i=1; sourceware.org;\n dkim=pass (1024-bit key, unprotected)\n header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss\n header.b=pLj69ogb","DKIM-Signature":"v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss;\n t=1778246542; bh=TOYoqfwp5xFRd6/pnLZHbBTLPoYeI6wFJenwN7HI1Ok=;\n h=From:To:Cc:Subject:Date:From;\n b=pLj69ogbWBYG25dIfmCe5GZK/62Y5Xp43zw1T5hvFWM9kAwe+Mtc02Hj2jMZ3kAbH\n qvL8ep3pDo7+ELOVJjPtM9HmSoy3MTJfHF0QLCQusQijFAioT4GZ+lN26K8sFrmmmL\n mlgRXQMgWztC1tO/EMAOiKdhXjHKdWCTE82w1PA0=","From":"Yury Khrustalev ","To":"libc-alpha@sourceware.org","Cc":"DJ Delorie ,\n Adhemerval Zanella ,\n Andreas Schwab , Wilco Dijkstra ,\n Florian Weimer ","Subject":"[PATCH 0/3] Remove broken memory tagging in malloc","Date":"Fri, 8 May 2026 14:22:08 +0100","Message-ID":"<20260508132211.3504357-1-yury.khrustalev@arm.com>","X-Mailer":"git-send-email 2.47.3","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-BeenThere":"libc-alpha@sourceware.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Libc-alpha mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org"},"content":"Remove broken bits from core malloc code and clean-up the\ncode. This includes:\n\n - Removing of the '--enable-memory-tagging' configure option\n (we will not need a separate build configuration for memory\n tagging, this should make testing much easier).\n - Removing of the 'USE_MTAG' macro and the 'glibc.mem.tagging'\n tunable.\n\nNo functional changes unrelated to memory tagging.\n\nThis is part of work to fix memory tagging in malloc that\nyou can see in [1]. Submitted as a separate patch series\nto make code review easier.\n\n[1]: https://sourceware.org/git/?p=glibc.git;a=shortlog;h=refs/heads/arm/malloc-mte-v1\n\n---\nbase-commit: 37ee8868dc\n\nPasses regression on aarch64 and x86_64, also build-tested\nfor various targets using the build-many-glibcs script.\n\nOK for trunk?\n---\n\nYury Khrustalev (3):\n configure: remove --enable-memory-tagging option\n malloc: Remove code conditional on USE_MTAG\n malloc: Remove currently broken memory tagging\n\n INSTALL | 14 --\n config.h.in | 3 -\n config.make.in | 2 -\n configure | 24 --\n configure.ac | 15 --\n elf/dl-tunables.list | 5 -\n malloc/arena.c | 18 +-\n malloc/malloc-check.c | 26 +-\n malloc/malloc.c | 236 ++----------------\n manual/install.texi | 13 -\n manual/tunables.texi | 29 ---\n sysdeps/aarch64/Makefile | 9 +-\n ...__mtag_tag_region.S => __mte_tag_region.S} | 7 +-\n ..._zero_region.S => __mte_tag_region_zero.S} | 7 +-\n .../aarch64/{libc-mtag.h => aarch64-mte.h} | 73 +++---\n sysdeps/aarch64/cpu-features.h | 3 +-\n sysdeps/aarch64/dl-diagnostics-cpu.c | 2 -\n sysdeps/generic/libc-mtag.h | 73 ------\n .../unix/sysv/linux/aarch64/cpu-features.c | 28 ---\n 19 files changed, 70 insertions(+), 517 deletions(-)\n rename sysdeps/aarch64/{__mtag_tag_region.S => __mte_tag_region.S} (96%)\n rename sysdeps/aarch64/{__mtag_tag_zero_region.S => __mte_tag_region_zero.S} (95%)\n rename sysdeps/aarch64/{libc-mtag.h => aarch64-mte.h} (55%)\n delete mode 100644 sysdeps/generic/libc-mtag.h"}