linux-kernel - Re: [kernel-hardening] [PATCH 2/2] arm: Kconfig: Add ARCH_HAS_FORTIFY

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Message-ID: <CAGXu5j+OUHmviXLeZGzLH3q9F-z1s6-8epG-y1ZusgOyGEy24Q@mail.gmail.com>
Date:   Wed, 28 Feb 2018 08:54:48 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Jinbum Park <jinb.park7@...il.com>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Philippe Ombredanne <pombredanne@...b.co>,
        Greg KH <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Dmitry Safonov <dsafonov@...tuozzo.com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Micay <danielmicay@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [kernel-hardening] [PATCH 2/2] arm: Kconfig: Add ARCH_HAS_FORTIFY_SOURCE

On Wed, Feb 28, 2018 at 6:30 AM, Jinbum Park <jinb.park7@...il.com> wrote:
> CONFIG_FORTIFY_SOURCE detects various overflows at compile-time.
> (6974f0c4555e ("include/linux/string.h:
> add the option of fortified string.h functions)
>
> ARCH_HAS_FORTIFY_SOURCE means that the architecture can be built and
> run with CONFIG_FORTIFY_SOURCE.
>
> Since ARM can be built and run with that flag like other architectures,
> select ARCH_HAS_FORTIFY_SOURCE as default.
>
> Signed-off-by: Jinbum Park <jinb.park7@...il.com>

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  arch/arm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 7e3d535..3765336 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -7,6 +7,7 @@ config ARM
>         select ARCH_HAS_DEBUG_VIRTUAL if MMU
>         select ARCH_HAS_DEVMEM_IS_ALLOWED
>         select ARCH_HAS_ELF_RANDOMIZE
> +       select ARCH_HAS_FORTIFY_SOURCE
>         select ARCH_HAS_SET_MEMORY
>         select ARCH_HAS_PHYS_TO_DMA
>         select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
> --
> 1.9.1
>



-- 
Kees Cook
Pixel Security