linux-kernel - Re: [PATCH] ARM: fix atags_to_fdt with stack-protector-strong

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Date:	Fri, 18 Dec 2015 22:09:12 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Kees Cook <keescook@...omium.org>
Cc:	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, Jeffy <jeffy.chen@...k-chips.com>,
	Simon Horman <horms+renesas@...ge.net.au>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Magnus Damm <damm+renesas@...nsource.se>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: fix atags_to_fdt with stack-protector-strong

On Friday 18 December 2015 13:04:59 Kees Cook wrote:
> +ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
> +CFLAGS_atags_to_fdt.o := -fno-stack-protector
> +CFLAGS_fdt.o := -fno-stack-protector
> +CFLAGS_fdt_ro.o := -fno-stack-protector
> +CFLAGS_fdt_rw.o := -fno-stack-protector
> +CFLAGS_fdt_wip.o := -fno-stack-protector
> +endif

I'm pretty sure you don't need the ifeq there, you can simply define those
flags unconditionally.

You can't just add -fno-stack-protector unconditionally, because that
breaks building the kernel with toolchains that are older than stack-protector,
so this should be

CFLAGS_obj.o += $(call cc-option, -fno-stack-protector)

Other than that, the patch looks ok.

	Arnd
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