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

[Kees Cook]

On Fri, Dec 18, 2015 at 1:09 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> 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.

Ah, yes, all excellent points. I'll resend. Thanks!

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security
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