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Message-ID: <20160810230242.GO1041@n2100.armlinux.org.uk>
Date: Thu, 11 Aug 2016 00:02:42 +0100
From: Russell King - ARM Linux <linux@...linux.org.uk>
To: Arnd Bergmann <arnd@...db.de>
Cc: linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
Kees Cook <keescook@...omium.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>, x86@...nel.org,
linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
Andrew Morton <akpm@...ux-foundation.org>,
Mathias Krause <minipli@...glemail.com>
Subject: Re: [PATCH 2/2] arm: apply more __ro_after_init
On Wed, Aug 10, 2016 at 09:31:05PM +0200, Arnd Bergmann wrote:
> On Wednesday, August 10, 2016 11:12:53 AM CEST Russell King - ARM Linux wrote:
> > There's the TLS emulation too, but that writes via the vectors mapping
> > at 0xffff0ff0.
>
> Ok, so that should be safe. Can we change the fiq code to also use the
> high mapping and then take the __ro_after_init patch on top?
We can't - if the kernel is configured without the kuser helpers in
the vectors page, it's mapped read-only. I'm not sure what the
intersection is between platforms that can have FIQs and platforms
that can disable the kuser helpers.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
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