linux-kernel - Re: [PATCH v4 2/6] proc/sysctl: Check for invalid flags bits

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Message-Id: <20180312135204.d56f7f1e64c96cf20786eb28@linux-foundation.org>
Date:   Mon, 12 Mar 2018 13:52:04 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Waiman Long <longman@...hat.com>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v4 2/6] proc/sysctl: Check for invalid flags bits

On Mon, 12 Mar 2018 16:15:40 -0400 Waiman Long <longman@...hat.com> wrote:

> Checking code is added to check for invalid flags in the ctl_table
> and return error if an unknown flag is used.

Why?  What's wrong with the old code, what value does this change add,
etc.