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

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Message-ID: <CAAeHK+yDWfAcdN2=THQFsfXHh2bKZ8QUDiOWKGc6weX3zpkPgw@mail.gmail.com>
Date:   Fri, 19 Jan 2018 18:58:45 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:     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, LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        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 Fri, Jan 19, 2018 at 4:57 PM, Andrey Ryabinin
<aryabinin@...tuozzo.com> wrote:
>
>
> 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.
>

Mailed v2.

Thanks!