linux-kernel - Re: [PATCH] ARM: VDSO: put read only/mostly objects into proper sections

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Date:	Wed, 10 Aug 2016 14:04:58 -0500
From:	Nathan Lynch <Nathan_Lynch@...tor.com>
To:	Kees Cook <keescook@...omium.org>
CC:	Jisheng Zhang <jszhang@...vell.com>,
	Russell King <linux@...linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: VDSO: put read only/mostly objects into proper
 sections

On 08/10/2016 01:47 PM, Kees Cook wrote:
> On Wed, Aug 10, 2016 at 2:59 AM, Jisheng Zhang <jszhang@...vell.com> wrote:
>> + Kees
>>
>> On Wed, 10 Aug 2016 17:09:47 +0800 wrote:
>>
>>> vdso_data_mapping is never modified, so mark it as const.
>>>
>>> vdso_data_page and vdso_text_mapping are initialized by vdso_init(),
>>> thereafter are mostly read during vdso special mapping handling.
>>>
>>> The fact that they are mostly read and not written to makes them
>>> candidates for __read_mostly declarations.
>>
>> Inspired by Kees's "arm: apply more __ro_after_init", is it better
>> to mark these vars as __ro_after_init?
> 
> Yeah, if they're not written outside of __init, please do. It would be
> a nice complement to commit 11bf9b865898 ("ARM/vdso: Mark the vDSO
> code read-only after init").

I agree.