linux-kernel - Re: Designated initializers, struct randomization and addressing?

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Message-ID: <CAGXu5jJA03Gfgvt05QMoG-pPi7TBaY983HXC1i3DQcOJfx+d_Q@mail.gmail.com>
Date:   Wed, 4 Jan 2017 14:30:59 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Julia Lawall <julia.lawall@...6.fr>, devel@...verdev.osuosl.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bruno Faccini <bruno.faccini@...el.com>,
        Oleg Drokin <oleg.drokin@...el.com>,
        Vitaly Fertman <vitaly_fertman@...atex.com>,
        Joe Perches <joe@...ches.com>,
        Andreas Dilger <andreas.dilger@...el.com>,
        "John L. Hammond" <john.hammond@...el.com>,
        Bruce Korb <bruce.korb@...il.com>,
        Emoly Liu <emoly.liu@...el.com>
Subject: Re: Designated initializers, struct randomization and addressing?

On Wed, Jan 4, 2017 at 8:55 AM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> On Tue, 3 Jan 2017 22:35:26 -0800
> Kees Cook <keescook@...omium.org> wrote:
>
>> For randstruct and constify, the automatic selection is done on
>> structures with only function pointers. (Additional structures can be
>> added via a compiler attribute marking.)
>>
>> See is_pure_ops_struct():
>
> Is there anyway to use this plugin to identify pure_ops structures not already marked as const?

That's what the constify plugin does, yes. Though to deal with cases
where something rarely written to, the
pax_open_kernel/pax_close_kernel annotations are needed, which is why
I don't have a sane port of the constify plugin yet. We need to build
upstream-acceptable infrastructure for the write-rarely case. But, as
Julia replied, yes, there's a huge list. :)

-Kees

-- 
Kees Cook
Nexus Security