linux-kernel - Re: [PATCH 21/30] stack-protector: test compiler capability in Kconfig and drop AUTO mode

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Message-ID: <CAGXu5jJQ9nkkpcUBvgvBxFhcVv7cBsCgT4HT3KC7+YHfpa6K6A@mail.gmail.com>
Date:   Fri, 13 Apr 2018 13:41:35 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kbuild <linux-kbuild@...r.kernel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Ulf Magnusson <ulfalizer@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Emese Revfy <re.emese@...il.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 21/30] stack-protector: test compiler capability in
 Kconfig and drop AUTO mode

On Fri, Apr 13, 2018 at 11:11 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>     config STACKPROTECTOR_FLAGS
>         string
>         default "-fstack-protector-strong" if CC_STACKPROTECTOR_STRONG
>         default "-fstack-protector" if CC_STACKPROTECTOR
>         default "-fno-stack-protector" if CC_HAS_STACKPROTECTOR_NONE
>         default ""
>
> which is really simple and straightforward. In the presense of
> multiple defaults, the first is picked, so this _automatically_ does
> that whole priority ordering.

Ah, perfect! Yes, this is a much better solution.

-Kees

-- 
Kees Cook
Pixel Security