linux-kernel - Re: Re: [PATCH v1 1/2] sysctl: cap to ULONG_MAX in proc_get

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Message-ID: <CAHrFyr7nXUPxysMNv-HHRVSCB3UUmSb60qwFM8zg3Zv41NC1RQ@mail.gmail.com>
Date:   Mon, 15 Oct 2018 21:32:30 +0200
From:   Christian Brauner <christian@...uner.io>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Waiman Long <longman@...hat.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Al Viro <viro@...iv.linux.org.uk>,
        Kees Cook <keescook@...omium.org>
Subject: Re: Re: [PATCH v1 1/2] sysctl: cap to ULONG_MAX in proc_get_long()

On Mon, Oct 15, 2018 at 9:27 PM Alexey Dobriyan <adobriyan@...il.com> wrote:
>
> > int kstrtoul_bounded(const char *s, unsigned int base,
> > char **trailing, unsigned long long *res)
>
> NO! The whole point is not have million variants of slightly different
> integer parsing functions.
> Cap it in the sysctl -- noone would care.

(Please keep the CC list when replying.)

Whatever works; I prefer the local strtoul_cap_erange() in kernel/sysctl.c as
well.