From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-13.3 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_NONE, USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id E4FDD7DBEB for ; Mon, 4 Nov 2019 14:30:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728607AbfKDO2u (ORCPT ); Mon, 4 Nov 2019 09:28:50 -0500 Received: from mail-ua1-f74.google.com ([209.85.222.74]:50351 "EHLO mail-ua1-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727838AbfKDO2u (ORCPT ); Mon, 4 Nov 2019 09:28:50 -0500 Received: by mail-ua1-f74.google.com with SMTP id y4so2657837uaa.17 for ; Mon, 04 Nov 2019 06:28:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=gOZJXriFYaJqnLiXWIeTvOu6TRK/57oj4m43E1U5Ltw=; b=iYeCrSfzcJoqpFfx6PikIHg8ccjBlymGJnP7hoPQwkYwjCtI9GxlmAhDNPMboxoTVO x0r3aGeA4Mh55fN74DlnnyoKLCP5EYtGoDRC1iJxDUrLjdkzWX2Z8xkzsuyteDFKdMu7 j9QngGU+Lh7YFeOyuqjYfowPE5w4CorcRwYknePhBEWSRm/ggfZyx7vY8L6GGJvAE6n8 QE3y+1uf000U7nWOZ0L0iV5yDzjIaUGAZazZh5REdGHMjOBwQujSQBLtL81TMYPnLLHX WF4N/P47ZjSdXzqhY+tOV7QPWdrBIiS+PKoKfUHodGpyf5G8hdYY2YVVFvpQ4MyVAoxn ATxw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=gOZJXriFYaJqnLiXWIeTvOu6TRK/57oj4m43E1U5Ltw=; b=Kyj1dVMXSxAV6DDxSb7LhrOhW+d1O3Z327vKmq+Y7Ai9iqGLufzu+7/3cL3d2qEyZd pErGJhm7vserQcHsyA7GWlmj/h92hsGi/XoEjU8SVYRsa0nMZ3b01Lyapux3D0LQVyp2 p2daq4nOLNRiDVSzzQeHnaJjQv6IvRvPTQUiIJSYyU3wpN+UAiqrrE0kIFeK8B/Zkcaa pHXVd6RDCBvMj4VHllQQrR5VH6Uib/WrYsn3wMeBAT0TqHIX5jekCJ/BlgVX4I15FVTv jCIgblpnSgr3BpFb33R42pEgtD8hFFpDbFuVeS2OVTyn3MT3OdiZfLJtz4oxIcvHhuZX QyNw== X-Gm-Message-State: APjAAAX2oOWlDn8W6OCX/nOFkN++v3HMY+2lHbxJEDr2oQ3+QABJ5Hon NXu4X/IbZ9HvsPM1Fz6GlSk4okxz5w== X-Google-Smtp-Source: APXvYqzSuwLczAxwseRWbVJPz3W76r9RPcuLhjVcCaAZtkQCbfSRQ1gJrmSs8glOqHVw0BLDi5YUSOLJcQ== X-Received: by 2002:a67:fbd9:: with SMTP id o25mr5000794vsr.70.1572877728570; Mon, 04 Nov 2019 06:28:48 -0800 (PST) Date: Mon, 4 Nov 2019 15:27:36 +0100 Message-Id: <20191104142745.14722-1-elver@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.24.0.rc1.363.gb1bccd3e3d-goog Subject: [PATCH v3 0/9] Add Kernel Concurrency Sanitizer (KCSAN) From: Marco Elver To: elver@google.com Cc: akiyks@gmail.com, stern@rowland.harvard.edu, glider@google.com, parri.andrea@gmail.com, andreyknvl@google.com, luto@kernel.org, ard.biesheuvel@linaro.org, arnd@arndb.de, boqun.feng@gmail.com, bp@alien8.de, dja@axtens.net, dlustig@nvidia.com, dave.hansen@linux.intel.com, dhowells@redhat.com, dvyukov@google.com, hpa@zytor.com, mingo@redhat.com, j.alglave@ucl.ac.uk, joel@joelfernandes.org, corbet@lwn.net, jpoimboe@redhat.com, luc.maranget@inria.fr, mark.rutland@arm.com, npiggin@gmail.com, paulmck@kernel.org, peterz@infradead.org, tglx@linutronix.de, will@kernel.org, kasan-dev@googlegroups.com, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-efi@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org This is the patch-series for the Kernel Concurrency Sanitizer (KCSAN). KCSAN is a sampling watchpoint-based data-race detector. More details are included in Documentation/dev-tools/kcsan.rst. This patch-series only enables KCSAN for x86, but we expect adding support for other architectures is relatively straightforward (we are aware of experimental ARM64 and POWER support). To gather early feedback, we announced KCSAN back in September, and have integrated the feedback where possible: http://lkml.kernel.org/r/CANpmjNPJ_bHjfLZCAPV23AXFfiPiyXXqqu72n6TgWzb2Gnu1eA@mail.gmail.com We want to point out and acknowledge the work surrounding the LKMM, including several articles that motivate why data-races are dangerous [1, 2], justifying a data-race detector such as KCSAN. [1] https://lwn.net/Articles/793253/ [2] https://lwn.net/Articles/799218/ The current list of known upstream fixes for data-races found by KCSAN can be found here: https://github.com/google/ktsan/wiki/KCSAN#upstream-fixes-of-data-races-found-by-kcsan Changelog --------- v3: * Major changes: - Add microbenchmark. - Add instruction watchpoint skip randomization. - Refactor API and core runtime fast-path and slow-path. Compared to the previous version, with a default config and benchmarked using the added microbenchmark, this version is 3.8x faster. - Make __tsan_unaligned __alias of generic accesses. - Rename kcsan_{begin,end}_atomic -> kcsan_{nestable,flat}_atomic_{begin,end} - For filter list in debugfs.c use kmalloc+krealloc instead of kvmalloc. - Split Documentation into separate patch. v2: http://lkml.kernel.org/r/20191017141305.146193-1-elver@google.com * Major changes: - Replace kcsan_check_access(.., {true, false}) with kcsan_check_{read,write}. - Change atomic-instrumented.h to use __atomic_check_{read,write}. - Use common struct kcsan_ctx in task_struct and for per-CPU interrupt contexts. v1: http://lkml.kernel.org/r/20191016083959.186860-1-elver@google.com Marco Elver (9): kcsan: Add Kernel Concurrency Sanitizer infrastructure kcsan: Add Documentation entry in dev-tools objtool, kcsan: Add KCSAN runtime functions to whitelist build, kcsan: Add KCSAN build exceptions seqlock, kcsan: Add annotations for KCSAN seqlock: Require WRITE_ONCE surrounding raw_seqcount_barrier asm-generic, kcsan: Add KCSAN instrumentation for bitops locking/atomics, kcsan: Add KCSAN instrumentation x86, kcsan: Enable KCSAN for x86 Documentation/dev-tools/index.rst | 1 + Documentation/dev-tools/kcsan.rst | 217 +++++++++ MAINTAINERS | 11 + Makefile | 3 +- arch/x86/Kconfig | 1 + arch/x86/boot/Makefile | 2 + arch/x86/boot/compressed/Makefile | 2 + arch/x86/entry/vdso/Makefile | 3 + arch/x86/include/asm/bitops.h | 6 +- arch/x86/kernel/Makefile | 7 + arch/x86/kernel/cpu/Makefile | 3 + arch/x86/lib/Makefile | 4 + arch/x86/mm/Makefile | 3 + arch/x86/purgatory/Makefile | 2 + arch/x86/realmode/Makefile | 3 + arch/x86/realmode/rm/Makefile | 3 + drivers/firmware/efi/libstub/Makefile | 2 + include/asm-generic/atomic-instrumented.h | 393 +++++++-------- include/asm-generic/bitops-instrumented.h | 18 + include/linux/compiler-clang.h | 9 + include/linux/compiler-gcc.h | 7 + include/linux/compiler.h | 35 +- include/linux/kcsan-checks.h | 97 ++++ include/linux/kcsan.h | 115 +++++ include/linux/sched.h | 4 + include/linux/seqlock.h | 51 +- init/init_task.c | 8 + init/main.c | 2 + kernel/Makefile | 6 + kernel/kcsan/Makefile | 11 + kernel/kcsan/atomic.h | 27 ++ kernel/kcsan/core.c | 560 ++++++++++++++++++++++ kernel/kcsan/debugfs.c | 275 +++++++++++ kernel/kcsan/encoding.h | 94 ++++ kernel/kcsan/kcsan.h | 131 +++++ kernel/kcsan/report.c | 306 ++++++++++++ kernel/kcsan/test.c | 121 +++++ kernel/sched/Makefile | 6 + lib/Kconfig.debug | 2 + lib/Kconfig.kcsan | 119 +++++ lib/Makefile | 3 + mm/Makefile | 8 + scripts/Makefile.kcsan | 6 + scripts/Makefile.lib | 10 + scripts/atomic/gen-atomic-instrumented.sh | 17 +- tools/objtool/check.c | 18 + 46 files changed, 2526 insertions(+), 206 deletions(-) create mode 100644 Documentation/dev-tools/kcsan.rst create mode 100644 include/linux/kcsan-checks.h create mode 100644 include/linux/kcsan.h create mode 100644 kernel/kcsan/Makefile create mode 100644 kernel/kcsan/atomic.h create mode 100644 kernel/kcsan/core.c create mode 100644 kernel/kcsan/debugfs.c create mode 100644 kernel/kcsan/encoding.h create mode 100644 kernel/kcsan/kcsan.h create mode 100644 kernel/kcsan/report.c create mode 100644 kernel/kcsan/test.c create mode 100644 lib/Kconfig.kcsan create mode 100644 scripts/Makefile.kcsan -- 2.24.0.rc1.363.gb1bccd3e3d-goog