linux-kernel - Re: [PATCH -next 2/2] crypto: x86: kmsan: disable accelerated configs in KMSAN builds

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Date:   Fri, 16 Sep 2022 11:23:47 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Eric Biggers <ebiggers@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Robert Elliott <elliott@....com>,
        Linux Crypto List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-next <linux-next@...r.kernel.org>,
        Alexander Potapenko <glider@...gle.com>
Subject: Re: [PATCH -next 2/2] crypto: x86: kmsan: disable accelerated configs
 in KMSAN builds

Hi Stephen,

Please use this patch to replace "crypto: x86: kmsan: disable
accelerated configs in KMSAN builds" when merging linux-mm into
linux-next (assuming arch/x86/crypto/Kconfig is still in -next).

On Fri, Sep 9, 2022 at 11:58 AM Alexander Potapenko <glider@...gle.com> wrote:
>
> KMSAN is unable to understand when initialized values come from assembly.
> Disable accelerated configs in KMSAN builds to prevent false positive
> reports.
>
> Signed-off-by: Alexander Potapenko <glider@...gle.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Eric Biggers <ebiggers@...nel.org>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: Robert Elliott <elliott@....com>
> Cc: Stephen Rothwell <sfr@...b.auug.org.au>
> Cc: linux-crypto@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-next@...r.kernel.org
> ---
>  crypto/Kconfig | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/crypto/Kconfig b/crypto/Kconfig
> index 40423a14f86f5..4a2915bd40d1f 100644
> --- a/crypto/Kconfig
> +++ b/crypto/Kconfig
> @@ -1430,7 +1430,9 @@ endif
>  if SPARC
>  source "arch/sparc/crypto/Kconfig"
>  endif
> -if X86
> +# KMSAN is unable to understand when initialized values come from assembly.
> +# Disable accelerated configs to prevent false positive reports.
> +if X86 && !KMSAN
>  source "arch/x86/crypto/Kconfig"
>  endif
>
> --
> 2.37.2.789.g6183377224-goog
>


-- 
Alexander Potapenko
Software Engineer

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