linux-kernel - Re: [kernel-hardening] [PATCH v5 1/4] gcc-plugins: Add the initify gcc plugin

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Message-ID: <CAGXu5j+2UQ43MdaaEhFfgEPUdJZGeEMB+BaMzwTVjOfLPFEbLQ@mail.gmail.com>
Date:   Tue, 28 Mar 2017 12:00:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Donnellan <andrew.donnellan@....ibm.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Emese Revfy <re.emese@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Josh Triplett <josh@...htriplett.org>,
        PaX Team <pageexec@...email.hu>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        minipli@...linux.so, Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        David Brown <david.brown@...aro.org>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jeff Layton <jlayton@...chiereds.net>,
        Sam Ravnborg <sam@...nborg.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [kernel-hardening] [PATCH v5 1/4] gcc-plugins: Add the initify
 gcc plugin

On Mon, Mar 27, 2017 at 8:03 PM, Andrew Donnellan
<andrew.donnellan@....ibm.com> wrote:
> On 27/03/17 18:38, Andrew Donnellan wrote:
>>
>> On 01/02/17 07:24, Kees Cook wrote:
>>>
>>> From: Emese Revfy <re.emese@...il.com>
>>>
>>> The kernel already has a mechanism to free up code and data memory that
>>> is only used during kernel or module initialization.  This plugin will
>>> teach the compiler to find more such code and data that can be freed
>>> after initialization.
>>
>>
>> Currently checking whether we can wire this up for powerpc without too
>> many problems...
>
>
> Added "select HAVE_GCC_PLUGIN_INITIFY_INIT_EXIT if GCC_PLUGINS" to
> arch/powerpc/Kconfig and have successfully compiled and booted a modular and
> non-modular powernv_defconfig, it looks like we handle the .exit sections
> correctly.
>
> Could this be folded in for further testing when you get around to v6, Kees?

Awesome, thanks for testing! I'll get it queued for a v6...

-Kees

-- 
Kees Cook
Pixel Security