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Message-ID: <CANpmjNPB8mFso7=WpUQ8Nbxon3kKTEGRUFMCVhjLNkfzey+TJg@mail.gmail.com>
Date: Thu, 17 Oct 2019 16:15:20 +0200
From: Marco Elver <elver@...gle.com>
To: Marco Elver <elver@...gle.com>
Cc: LKMM Maintainers -- Akira Yokosawa <akiyks@...il.com>,
Alan Stern <stern@...land.harvard.edu>,
Alexander Potapenko <glider@...gle.com>,
Andrea Parri <parri.andrea@...il.com>,
Andrey Konovalov <andreyknvl@...gle.com>,
Andy Lutomirski <luto@...nel.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
Boqun Feng <boqun.feng@...il.com>,
Borislav Petkov <bp@...en8.de>, Daniel Axtens <dja@...ens.net>,
Daniel Lustig <dlustig@...dia.com>,
dave.hansen@...ux.intel.com, David Howells <dhowells@...hat.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
Jade Alglave <j.alglave@....ac.uk>,
Joel Fernandes <joel@...lfernandes.org>,
Jonathan Corbet <corbet@....net>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Luc Maranget <luc.maranget@...ia.fr>,
Mark Rutland <mark.rutland@....com>,
Nicholas Piggin <npiggin@...il.com>,
"Paul E. McKenney" <paulmck@...ux.ibm.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Will Deacon <will@...nel.org>,
kasan-dev <kasan-dev@...glegroups.com>,
linux-arch <linux-arch@...r.kernel.org>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
linux-efi@...r.kernel.org,
Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Linux Memory Management List <linux-mm@...ck.org>,
"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [PATCH 0/8] Add Kernel Concurrency Sanitizer (KCSAN)
On Wed, 16 Oct 2019 at 10:41, Marco Elver <elver@...gle.com> wrote:
>
> 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
Sent v2: http://lkml.kernel.org/r/20191017141305.146193-1-elver@google.com
Many thanks,
-- Marco
> Marco Elver (8):
> kcsan: Add Kernel Concurrency Sanitizer infrastructure
> 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/kcsan.rst | 202 ++++++++++
> MAINTAINERS | 11 +
> Makefile | 3 +-
> arch/x86/Kconfig | 1 +
> arch/x86/boot/Makefile | 1 +
> arch/x86/boot/compressed/Makefile | 1 +
> arch/x86/entry/vdso/Makefile | 1 +
> arch/x86/include/asm/bitops.h | 2 +-
> arch/x86/kernel/Makefile | 6 +
> arch/x86/kernel/cpu/Makefile | 3 +
> arch/x86/lib/Makefile | 2 +
> arch/x86/mm/Makefile | 3 +
> arch/x86/purgatory/Makefile | 1 +
> arch/x86/realmode/Makefile | 1 +
> arch/x86/realmode/rm/Makefile | 1 +
> drivers/firmware/efi/libstub/Makefile | 1 +
> include/asm-generic/atomic-instrumented.h | 192 ++++++++-
> 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 | 116 ++++++
> include/linux/kcsan.h | 85 ++++
> include/linux/sched.h | 7 +
> include/linux/seqlock.h | 51 ++-
> init/init_task.c | 6 +
> init/main.c | 2 +
> kernel/Makefile | 6 +
> kernel/kcsan/Makefile | 14 +
> kernel/kcsan/atomic.c | 21 +
> kernel/kcsan/core.c | 458 ++++++++++++++++++++++
> kernel/kcsan/debugfs.c | 225 +++++++++++
> kernel/kcsan/encoding.h | 94 +++++
> kernel/kcsan/kcsan.c | 81 ++++
> kernel/kcsan/kcsan.h | 140 +++++++
> kernel/kcsan/report.c | 307 +++++++++++++++
> kernel/kcsan/test.c | 117 ++++++
> kernel/sched/Makefile | 6 +
> lib/Kconfig.debug | 2 +
> lib/Kconfig.kcsan | 88 +++++
> lib/Makefile | 3 +
> mm/Makefile | 8 +
> scripts/Makefile.kcsan | 6 +
> scripts/Makefile.lib | 10 +
> scripts/atomic/gen-atomic-instrumented.sh | 9 +-
> tools/objtool/check.c | 17 +
> 46 files changed, 2364 insertions(+), 16 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.c
> 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.c
> 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
>
> --
> 2.23.0.700.g56cf767bdb-goog
>
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