linux-kernel - Re: [kernel-hardening] Re: [PATCH] video: constify geode ops structures

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Date:	Mon, 9 Nov 2015 17:48:31 +0000 (GMT)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Emese Revfy <re.emese@...il.com>
cc:	kernel-hardening@...ts.openwall.com,
	Julia Lawall <julia.lawall@...6.fr>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Joe Perches <joe@...ches.com>, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [kernel-hardening] Re: [PATCH] video: constify geode ops
 structures

On Mon, 9 Nov 2015, Emese Revfy wrote:

> On Mon, 9 Nov 2015 14:50:47 +0000 (GMT)
> Julia Lawall <julia.lawall@...6.fr> wrote:
> > > Actually, it looks like Emese Revfy is going to merge the GCC plugin
> > > constify stuff sooner rather than later so maybe adding all these consts
> > > isn't going to be needed.
> >
> > Is there any advantage of const over the plugin?  The consts are easy to
> > add.
>
> Hi,
>
> I think it's a very good advantage that the plugin constifies automatically
> without regular maintenance (e.g., generate patches with coccinelle,
> send patches to the maintainers every new kernel version). ;)
> But if it doesn't convince you, I did constification by hand (with a coccinelle
> script) some years ago.
> There are too many types that can be const and it took too long to prepare and
> get the maintainers to accept the patches.
> And it never ends as there are always new types that can be const.

What happens if some structures cannot be made const because there is a
reassignment somewhere?  Is there any feedback about the problem?

julia

>
> > Does the plugin help for structures that have non-function fields?
> Yes, it does. See __do_const here:
> http://www.openwall.com/lists/kernel-hardening/2015/11/06/11
> or more about the constify plugin:
> https://pax.grsecurity.net/docs/PaXTeam-H2HC13-PaX-gcc-plugins.pdf
>
> --
> Emese
>
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