linux-kernel - Re: [PATCH v3 1/2] minmax: sanity check constant bounds when clamping

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Message-ID: <202209261125.8AEBF245@keescook>
Date:   Mon, 26 Sep 2022 11:26:03 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 1/2] minmax: sanity check constant bounds when clamping

On Mon, Sep 26, 2022 at 03:34:34PM +0200, Jason A. Donenfeld wrote:
> The clamp family of functions only makes sense if hi>=lo. If hi and lo
> are compile-time constants, then raise a build error. Doing so has
> already caught buggy code. This also introduces the infrastructure to
> improve the clamping function in subsequent commits.
> 
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Kees Cook <keescook@...omium.org>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook