linux-kernel - Re: [PATCH] ARM: vdso: Mark vDSO code as read-only

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Message-ID: <56C5A112.25195.35DDEA@pageexec.freemail.hu>
Date:	Thu, 18 Feb 2016 11:46:42 +0100
From:	"PaX Team" <pageexec@...email.hu>
To:	David Brown <david.brown@...aro.org>,
	Kees Cook <keescook@...omium.org>
CC:	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Ingo Molnar <mingo@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Mathias Krause <minipli@...glemail.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"x86@...nel.org" <x86@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Emese Revfy <re.emese@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] ARM: vdso: Mark vDSO code as read-only

On 17 Feb 2016 at 15:48, Kees Cook wrote:

> On Wed, Feb 17, 2016 at 3:43 PM, David Brown <david.brown@...aro.org> wrote:

> > Is there a possible future consideration to perhaps make .rodata read
> > only much earlier?
> 
> Yeah, this will likely be a future improvement. Some architectures
> already mark .rodata before the mark_rodata_ro() call. Once we start
> to have more use of postinit-readonly, I suspect we'll see more
> clarification of when those things happen.

FYI, PaX had enforced early rodata on i386 during the 2.4 series (i.e.,
decade+ ago) but i abandoned it for 2.6 due to the maintenance burden
coupled with its low benefit...