linux-kernel - Re: [PATCH v13 05/25] kasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_SW

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Date:   Tue, 11 Dec 2018 17:02:42 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Dave Martin <dave.martin@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Lawrence <paullawrence@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-sparse@...r.kernel.org,
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        Jann Horn <jannh@...gle.com>,
        Mark Brand <markbrand@...gle.com>,
        Chintan Pandya <cpandya@...eaurora.org>,
        Vishwath Mohan <vishwath@...gle.com>
Subject: Re: [PATCH v13 05/25] kasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_SW_TAGS

On Tue, Dec 11, 2018 at 4:28 PM Luc Van Oostenryck
<luc.vanoostenryck@...il.com> wrote:
>
> On Thu, Dec 06, 2018 at 01:24:23PM +0100, Andrey Konovalov wrote:
> > diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
> > index 3e7dafb3ea80..39f668d5066b 100644
> > --- a/include/linux/compiler-clang.h
> > +++ b/include/linux/compiler-clang.h
> > @@ -16,9 +16,13 @@
> >  /* all clang versions usable with the kernel support KASAN ABI version 5 */
> >  #define KASAN_ABI_VERSION 5
> >
> > +#if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
> >  /* emulate gcc's __SANITIZE_ADDRESS__ flag */
> > -#if __has_feature(address_sanitizer)
> >  #define __SANITIZE_ADDRESS__
> > +#define __no_sanitize_address \
> > +             __attribute__((no_sanitize("address", "hwaddress")))
> > +#else
> > +#define __no_sanitize_address
> >  #endif
> >
> >  /*
> > diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
> > index 2010493e1040..5776da43da97 100644
> > --- a/include/linux/compiler-gcc.h
> > +++ b/include/linux/compiler-gcc.h
> > @@ -143,6 +143,12 @@
> >  #define KASAN_ABI_VERSION 3
> >  #endif
> >
> > +#if __has_attribute(__no_sanitize_address__)
> > +#define __no_sanitize_address __attribute__((no_sanitize_address))
> > +#else
> > +#define __no_sanitize_address
> > +#endif
>
> Not really important but it's the name with leading and trailing
> underscores that is tested with __has_attribute() but then it's
> the naked 'no_sanitize_address' that is used in the attribute.

Hi Luc,

You're right. This shouldn't be important though, since "__" in
attribute names are optional AFAIK. It might make sense to fix it as a
separate patch when this series is merged.

Thanks!