linux-kernel - Re: [PATCH v4] proc/sysctl: add shared variables for range check

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Message-ID: <CAGXu5j+qejH0c9fG=TwmSyK0FkaiNidgqYZrqgKPf4D_=u2k8A@mail.gmail.com>
Date:   Tue, 30 Apr 2019 08:42:42 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Matteo Croce <mcroce@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v4] proc/sysctl: add shared variables for range check

On Tue, Apr 30, 2019 at 3:47 AM Matteo Croce <mcroce@...hat.com> wrote:
>
> On Tue, Apr 30, 2019 at 12:26 AM Matteo Croce <mcroce@...hat.com> wrote:
> >
> > Add a const int array containing the most commonly used values,
> > some macros to refer more easily to the correct array member,
> > and use them instead of creating a local one for every object file.
> >
>
> Ok it seems that this simply can't be done, because there are at least
> two points where extra1,2 are set to a non const struct:
> in ip_vs_control_net_init_sysctl() it's assigned to struct netns_ipvs,
> while in mpls_dev_sysctl_register() it's assigned to a struct mpls_dev
> and a struct net.

Why can't these be converted to const also? I don't see the pointer
changing anywhere. They're created in one place and never changed.

If it's only a couple places, it seems like it'd be nice to get these fixed.

-- 
Kees Cook