linux-kernel - Re: [PATCH 7/7] include/linux/string.h: add the option of fortified string.h functions

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Message-ID: <CAK8P3a2ruTGnDUrPE5zWpO1Gixd=bd=LxCWci+UL0ym0BH7e2A@mail.gmail.com>
Date:   Sun, 10 Sep 2017 15:51:16 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Daniel Micay <danielmicay@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Axtens <dja@...ens.net>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Chris Metcalf <cmetcalf@...hip.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 7/7] include/linux/string.h: add the option of fortified
 string.h functions

On Sun, Sep 10, 2017 at 12:55 PM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
55e285a upstream.
>
>> --- a/include/linux/string.h
>> +++ b/include/linux/string.h
>> @@ -187,4 +187,204 @@ static inline const char *kbasename(const char *path)
>>         return tail ? tail + 1 : path;
>>  }
>>
>> +#define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline))
>
> With gcc-4.1.2, I now get zillions of:
>
>     include/linux/string.h:439: warning: ‘gnu_inline’ attribute
> directive ignored
>
> This attribute seems to be supported as of gcc 4.2?
>

I think in older compilers this was the default, so we could add a macro in
compiler.h that makes becomes an empty string there. If we do that,
we should also address these new warning on gcc-4.3:

arch/x86/include/asm/string_32.h:30: warning: 'strlen' declared inline
after being called
arch/x86/include/asm/string_32.h:252: warning: 'strnlen' declared
inline after being called
arch/x86/include/asm/string_32.h:252: warning: previous declaration of
'strnlen' was here
arch/x86/include/asm/string_32.h:145: warning: 'memcpy' declared
inline after being called
include/linux/string.h:81: warning: 'strlen' declared inline after being called
include/linux/string.h:81: warning: previous declaration of 'strlen' was here
include/linux/string.h:84: warning: 'strnlen' declared inline after being called
include/linux/string.h:84: warning: previous declaration of 'strnlen' was here

      Arnd