linux-kernel - Re: [PATCH v4 3/3] MIPS: set stack/data protection as non-executable

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Date:	Wed, 5 Aug 2015 17:46:51 -0700
From:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To:	David Daney <ddaney@...iumnetworks.com>
CC:	Paul Burton <paul.burton@...tec.com>, <daniel.sanders@...tec.com>,
	<linux-mips@...ux-mips.org>, <cernekee@...il.com>,
	<Zubair.Kakakhel@...tec.com>, <geert+renesas@...der.be>,
	<david.daney@...ium.com>, <peterz@...radead.org>,
	<heiko.carstens@...ibm.com>, <paul.gortmaker@...driver.com>,
	<behanw@...verseincode.com>, <macro@...ux-mips.org>,
	<cl@...ux.com>, <pkarat@...sta.com>, <linux@...ck-us.net>,
	<tkhai@...dex.ru>, <james.hogan@...tec.com>,
	<alexinbeijing@...il.com>, <rusty@...tcorp.com.au>,
	<Steven.Hill@...tec.com>, <lars.persson@...s.com>,
	<aleksey.makarov@...iga.com>, <linux-kernel@...r.kernel.org>,
	<ralf@...ux-mips.org>, <luto@...capital.net>,
	<dahi@...ux.vnet.ibm.com>, <markos.chandras@...tec.com>,
	<eunb.song@...sung.com>, <kumba@...too.org>
Subject: Re: [PATCH v4 3/3] MIPS: set stack/data protection as non-executable

On 08/05/2015 05:37 PM, David Daney wrote:
> This just means that your userspace is broken.
>
> If GLibC cannot do the right thing then it should be fixed.

Let's skip this until you explain how to create a fully 
non-executable-stack process. GLIBC people is ready to do something but 
after we remove emulation from stack.

>
>
> You cannot change the default setting for executable stack just 
> because you have created a broken userspace.

Please give me at least one example, one existing application which 
would suffer.

I remember that people already wrote here that this kind of apps (which 
is based on eXecutable stack and doesn't announce it in PT_GNU_STACK) 
need to be eliminated.

>
> The ability of legacy userspace to continue functioning cannot be 
> sacrificed.
>

Not at any price.

However, this switch is a separate patch from others. It can be not 
applied or it can be applied, depending from prevailing mind - what is 
more significant, some (unknown) app or non-executable stack protection.

- Leonid.
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