linux-kernel - Re: [PATCH v3] ARM: fix atags_to_fdt with stack-protector-strong

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Message-ID: <CAMuHMdV-bHCughvYcVQfCf5wA-eS76LSeX4kPw13FZdvqQk9eg@mail.gmail.com>
Date:	Thu, 7 Jan 2016 20:11:37 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	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" 
	<linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] ARM: fix atags_to_fdt with stack-protector-strong

Hi Kees,

On Thu, Jan 7, 2016 at 7:40 PM, Kees Cook <keescook@...omium.org> wrote:
>> Also, I suspect that all of the decompressor should be built with
>> -fno-stack-protector as we don't have sufficient environment here.
>> Maybe it should be placed in the global CFLAGS for the decompressor?
>
> I prefer keeping it disabled in as narrow a range as possible. If
> other code gains a level of complexity that it triggers the stack
> protector code insertion, I think that's worth examining when it
> happens. If this ever becomes an actual burden, then yeah, let's do it
> for the whole decompressor, but I think it'd be best to revisit it if
> it happens again.

What's the failure mode if the stack protector code insertion is triggered?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds