linux-kernel - Re: [PATCH v2 7/8] locking/atomics, kcsan: Add KCSAN instrumentation

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Date:   Tue, 22 Oct 2019 13:33:30 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Marco Elver <elver@...gle.com>
Cc:     akiyks@...il.com, stern@...land.harvard.edu, glider@...gle.com,
        parri.andrea@...il.com, andreyknvl@...gle.com, luto@...nel.org,
        ard.biesheuvel@...aro.org, arnd@...db.de, boqun.feng@...il.com,
        bp@...en8.de, dja@...ens.net, dlustig@...dia.com,
        dave.hansen@...ux.intel.com, dhowells@...hat.com,
        dvyukov@...gle.com, hpa@...or.com, mingo@...hat.com,
        j.alglave@....ac.uk, joel@...lfernandes.org, corbet@....net,
        jpoimboe@...hat.com, luc.maranget@...ia.fr, npiggin@...il.com,
        paulmck@...ux.ibm.com, peterz@...radead.org, tglx@...utronix.de,
        will@...nel.org, kasan-dev@...glegroups.com,
        linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-efi@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Subject: Re: [PATCH v2 7/8] locking/atomics, kcsan: Add KCSAN instrumentation

On Thu, Oct 17, 2019 at 04:13:04PM +0200, Marco Elver wrote:
> This adds KCSAN instrumentation to atomic-instrumented.h.
> 
> Signed-off-by: Marco Elver <elver@...gle.com>
> ---
> v2:
> * Use kcsan_check{,_atomic}_{read,write} instead of
>   kcsan_check_{access,atomic}.
> * Introduce __atomic_check_{read,write} [Suggested by Mark Rutland].
> ---
>  include/asm-generic/atomic-instrumented.h | 393 +++++++++++-----------
>  scripts/atomic/gen-atomic-instrumented.sh |  17 +-
>  2 files changed, 218 insertions(+), 192 deletions(-)

The script changes and generated code look fine to me, so FWIW:

Reviewed-by: Mark Rutland <mark.rutland@....com>

Thanks,
Mark.

> diff --git a/scripts/atomic/gen-atomic-instrumented.sh b/scripts/atomic/gen-atomic-instrumented.sh
> index e09812372b17..8b8b2a6f8d68 100755
> --- a/scripts/atomic/gen-atomic-instrumented.sh
> +++ b/scripts/atomic/gen-atomic-instrumented.sh
> @@ -20,7 +20,7 @@ gen_param_check()
>  	# We don't write to constant parameters
>  	[ ${type#c} != ${type} ] && rw="read"
>  
> -	printf "\tkasan_check_${rw}(${name}, sizeof(*${name}));\n"
> +	printf "\t__atomic_check_${rw}(${name}, sizeof(*${name}));\n"
>  }
>  
>  #gen_param_check(arg...)
> @@ -107,7 +107,7 @@ cat <<EOF
>  #define ${xchg}(ptr, ...)						\\
>  ({									\\
>  	typeof(ptr) __ai_ptr = (ptr);					\\
> -	kasan_check_write(__ai_ptr, ${mult}sizeof(*__ai_ptr));		\\
> +	__atomic_check_write(__ai_ptr, ${mult}sizeof(*__ai_ptr));		\\
>  	arch_${xchg}(__ai_ptr, __VA_ARGS__);				\\
>  })
>  EOF
> @@ -148,6 +148,19 @@ cat << EOF
>  
>  #include <linux/build_bug.h>
>  #include <linux/kasan-checks.h>
> +#include <linux/kcsan-checks.h>
> +
> +static inline void __atomic_check_read(const volatile void *v, size_t size)
> +{
> +	kasan_check_read(v, size);
> +	kcsan_check_atomic_read(v, size);
> +}
> +
> +static inline void __atomic_check_write(const volatile void *v, size_t size)
> +{
> +	kasan_check_write(v, size);
> +	kcsan_check_atomic_write(v, size);
> +}
>  
>  EOF
>  
> -- 
> 2.23.0.866.gb869b98d4c-goog
>