linux-kernel - Re: [PATCH] kasan: don't emit builtin calls when sanitization is off

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Date:   Fri, 19 Jan 2018 18:57:35 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com
Cc:     Kostya Serebryany <kcc@...gle.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Stephen Hines <srhines@...gle.com>,
        Pirama Arumuga Nainar <pirama@...gle.com>,
        Manoj Gupta <manojgupta@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] kasan: don't emit builtin calls when sanitization is off



On 01/19/2018 05:54 PM, Andrey Konovalov wrote:

> diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
> index dbbd4382f15a..db473309f136 100644
> --- a/scripts/Makefile.kasan
> +++ b/scripts/Makefile.kasan
> @@ -39,4 +39,7 @@ else
>  endif
>  
>  CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
> +
> +CFLAGS_KASAN_NOSANITIZE := $(call cc-option, -fno-builtin)
> +

I think it should be fine to drop cc-option here. Even ancient versions of GCC have -fno-builtin.

>  endif
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 1ca4dcd2d500..015aa9dbad86 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -121,7 +121,7 @@ endif
>  ifeq ($(CONFIG_KASAN),y)
>  _c_flags += $(if $(patsubst n%,, \
>  		$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
> -		$(CFLAGS_KASAN))
> +		$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
>  endif
>  
>  ifeq ($(CONFIG_UBSAN),y)
>