linux-kernel - Re: [PATCH v3] kconfig.h: Include compiler types to avoid missed struct attributes

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Message-ID: <CAGXu5jJZh+LJYULPO=xqwz9ADm8Z3k+mKKnHXQYD2KWtwfxqbg@mail.gmail.com>
Date:   Thu, 22 Feb 2018 11:57:18 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Patrick McLean <chutzpah@...too.org>,
        "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] kconfig.h: Include compiler types to avoid missed
 struct attributes

On Thu, Feb 22, 2018 at 10:04 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Thu, Feb 22, 2018 at 9:41 AM, Kees Cook <keescook@...omium.org> wrote:
>>
>> Updated to include Tested-by. Linus, this looks ready to go.
>
> Ok, applied.
>
> I'm a bit worried that this ends up bypassing our automatic dependency
> generation.
>
> Lookie here (in a fully built tree):
>
>     find . -name '*.o.cmd' |
>         xargs grep -L linux/compiler_types.h |
>         xargs grep -l linux/kconfig.h |
>         while read i; do
>             j=$(echo $i | sed 's/\.o.cmd$/\.c/' | sed 's:/\.:/:');
>             test -f $j && echo $j;
>         done
>
> shows that a number of files don't end up depending on that header
> file, even though it's included (that "grep -l linux/kconfig,h"
> triggers on the command itself having that "-include linux/kconfig.h"
> line).
>
> It looks like "gcc -M" just doesn't list any files that get included
> on the command line with "-include".

Hmm. But does that mean deps for kconfig.h are broken too? That seems
silly. I'll take a look...

-Kees

-- 
Kees Cook
Pixel Security