linux-kernel - Re: [PATCH v6 3/8] sysctl: Warn when a clamped sysctl parameter is set out of range

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Date:   Mon, 30 Apr 2018 15:40:29 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Waiman Long <longman@...hat.com>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        linux-doc@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v6 3/8] sysctl: Warn when a clamped sysctl parameter is
 set out of range

I like this series overall, thanks! No objections from me. One thing I
noted, though:

On Fri, Apr 27, 2018 at 2:00 PM, Waiman Long <longman@...hat.com> wrote:
>                 if (param->min && *param->min > val) {
>                         if (clamp) {
>                                 val = *param->min;
> +                               clamped = true;
>                         } else {
>                                 return -EINVAL;
>                         }

This appears as a common bit of logic in many places in the series. It
seems like it'd make sense to make this a helper of some kind?

-Kees

-- 
Kees Cook
Pixel Security