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

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Message-ID: <9016b939-b92c-e230-df26-f4462f09c2b9@redhat.com>
Date:   Tue, 1 May 2018 09:41:03 -0400
From:   Waiman Long <longman@...hat.com>
To:     Kees Cook <keescook@...omium.org>
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

On 04/30/2018 06:40 PM, Kees Cook wrote:
> 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
>
We can't have an inline helper function because the types are different.
We may be able to use a helper macro, but helper macro like that may be
not well accepted by the kernel community.

Cheers,
Longman