linux-kernel - Re: [PATCH v9 1/6] kasan: allow an architecture to disable inline instrumentation

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Date:   Tue, 1 Dec 2020 17:49:21 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Daniel Axtens <dja@...ens.net>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        kasan-dev@...glegroups.com, christophe.leroy@....fr,
        aneesh.kumar@...ux.ibm.com, bsingharora@...il.com
Subject: Re: [PATCH v9 1/6] kasan: allow an architecture to disable inline
 instrumentation



Le 01/12/2020 à 17:16, Daniel Axtens a écrit :
> For annoying architectural reasons, it's very difficult to support inline
> instrumentation on powerpc64.
> 
> Add a Kconfig flag to allow an arch to disable inline. (It's a bit
> annoying to be 'backwards', but I'm not aware of any way to have
> an arch force a symbol to be 'n', rather than 'y'.)
> 
> Signed-off-by: Daniel Axtens <dja@...ens.net>
> ---
>   lib/Kconfig.kasan | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index 542a9c18398e..31a0b28f6c2b 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -9,6 +9,9 @@ config HAVE_ARCH_KASAN_SW_TAGS
>   config	HAVE_ARCH_KASAN_VMALLOC
>   	bool
>   
> +config HAVE_ARCH_NO_KASAN_INLINE

Maybe a better name could be: ARCH_DISABLE_KASAN_INLINE

> +	def_bool n
> +
>   config CC_HAS_KASAN_GENERIC
>   	def_bool $(cc-option, -fsanitize=kernel-address)
>   
> @@ -108,6 +111,7 @@ config KASAN_OUTLINE
>   
>   config KASAN_INLINE
>   	bool "Inline instrumentation"
> +	depends on !HAVE_ARCH_NO_KASAN_INLINE
>   	help
>   	  Compiler directly inserts code checking shadow memory before
>   	  memory accesses. This is faster than outline (in some workloads
>