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

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Message-ID: <CAK8P3a2Xh3O3j6uAskVj8YHOK=sMNBGvR_o_jSN53RdQp7NyZg@mail.gmail.com>
Date:   Tue, 28 Mar 2017 09:49:55 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrew Donnellan <andrew.donnellan@....ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Emese Revfy <re.emese@...il.com>,
        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>
Subject: Re: [kernel-hardening] [PATCH v5 1/4] gcc-plugins: Add the initify
 gcc plugin

On Mon, Mar 27, 2017 at 6:14 PM, Kees Cook <keescook@...omium.org> wrote:
> On Mon, Mar 27, 2017 at 12:38 AM, Andrew Donnellan
> <andrew.donnellan@....ibm.com> 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...
>
> Cool, thanks. FWIW, note that this plugin is a bit back-burnered at
> the moment. I've got this in my -next tree still, but it needs some
> rather large changes to how it does its annotations before Linus will
> accept it.

I've tried turning it on again a few days ago and still got too many build
problems with my randconfig tree, so I've turned it off again. I think I've
already reported most of what I found now, so I did not send out new
reports.

      Arnd