linux-kernel - Re: [kernel-hardening] [PATCH 2/2] arm: apply more __ro_after

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Message-ID: <CAGXu5jJr2UzsdkSv2ogkoBEx2iFNY7N4QpvX5sLzM+Vb97a=zg@mail.gmail.com>
Date:	Fri, 3 Jun 2016 14:26:54 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	linux-arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Mathias Krause <minipli@...glemail.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [kernel-hardening] [PATCH 2/2] arm: apply more __ro_after_init

On Fri, Jun 3, 2016 at 11:51 AM, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Fri, Jun 03, 2016 at 11:40:24AM -0700, Kees Cook wrote:
>> Guided by grsecurity's analogous __read_only markings in arch/arm,
>> this applies several uses of __ro_after_init to structures that are
>> only updated during __init.
>>
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>>  arch/arm/kernel/cpuidle.c |  2 +-
>>  arch/arm/kernel/setup.c   | 10 +++++-----
>>  arch/arm/kernel/smp.c     |  2 +-
>>  arch/arm/lib/delay.c      |  2 +-
>>  arch/arm/mm/mmu.c         |  9 ++-------
>>  arch/x86/mm/ioremap.c     |  3 +--
>
> I don't think this x86 file is an arm-specific one :)

Hah, whooops. :)

> That minor nit aside, these patches are a great step forward, are you
> going to take them and work to push them upstream, or do you want/need
> others to do this?

I'll collect more like these and carry a tree for -next and push them for v4.8.

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security