linux-kernel - Re: [kernel-hardening] [PATCH 0/2] introduce post-init read-only memory

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Message-ID: <56558826.1060202@ladisch.de>
Date:	Wed, 25 Nov 2015 11:06:30 +0100
From:	Clemens Ladisch <clemens@...isch.de>
To:	Mathias Krause <minipli@...glemail.com>,
	kernel-hardening@...ts.openwall.com
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86-ml <x86@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Michael Ellerman <mpe@...erman.id.au>,
	linux-arch@...r.kernel.org, PaX Team <pageexec@...email.hu>,
	Emese Revfy <re.emese@...il.com>
Subject: Re: [kernel-hardening] [PATCH 0/2] introduce post-init read-only
 memory

Mathias Krause wrote:
> [...]
> So, prior extending the usage of the __read_only annotation some
> toolchain support is needed. Maybe a gcc plugin that'll warn/error on
> code that writes to such a variable but is not __init itself.

Or mark them as "const".  This would require the initialization code to
cast it away, probably with a helper macro.


Regards,
Clemens
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