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

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Message-ID: <CAGXu5jKE3DA84XT8TqLHthGQ1wc8vUwNDsCz0AWfyCLwg8cg=Q@mail.gmail.com>
Date:   Sun, 15 Apr 2018 09:04:44 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        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 Sun, Apr 15, 2018 at 6:28 AM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> In my Makefile ...
>
> stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
> stackp-flags-$(CONFIG_CC_STACKPROTECTOR)          := -fstack-protector
> stackp-flags-$(CONFIG_CC_STACKPROTECTOR_STRONG)   := -fstack-protector-strong
>
> KBUILD_CFLAGS += $(stackp-flags-y)
>
> the last one is picked.

Ah! Yes, sorry for the noise. I see the := instead of += now. Thanks!

-Kees

-- 
Kees Cook
Pixel Security