linux-kernel - Re: [PATCH v2] ARM: mm: flip priority of CONFIG_DEBUG

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Message-ID: <CAGXu5j+MrX-OvnVTYH0hqF2XgZW10PQOviyN=e5heejLsXewVA@mail.gmail.com>
Date:	Mon, 4 Jan 2016 12:34:28 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Tony Lindgren <tony@...mide.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Laura Abbott <labbott@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Laura Abbott <labbott@...oraproject.org>
Subject: Re: [PATCH v2] ARM: mm: flip priority of CONFIG_DEBUG_RODATA

On Wed, Dec 23, 2015 at 4:34 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Wed, Dec 23, 2015 at 04:11:22PM -0800, Tony Lindgren wrote:
>> * Nicolas Pitre <nicolas.pitre@...aro.org> [151223 13:45]:
>> > We fixed a bunch of similar issues where code was located in the .data
>> > section for ease of use from assembly code.  See commit b4e61537 and
>> > d0776aff for example.
>>
>> Thanks hey some assembly fun for the holidays :) I also need to check what
>> all gets relocated to SRAM here.
>>
>> In any case, seems like the $subject patch is too intrusive for v4.5 at
>> this point.
>
> Given Christmas and an unknown time between that and the merge window
> actually opening, I decided Tuesday would be the last day I take any
> patches into my tree - and today would be the day that I drop anything
> that causes problems.
>
> So, I've already dropped this, so tomorrow's linux-next should not have
> this change.
>
> You'll still see breakage if people enable RODATA though, but that's no
> different from previous kernels.

Ugh, sorry for the breakage.

Should this patch stay as-is and people will fix their various RODATA
failures during the next devel window, or should I remove the "default
y if CPU_V7"?

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security
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