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

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Message-ID: <CAHmME9qAqJrds_R6R6+5MpxJyP-H_w-pwCHQfh26SnLhWJ-2Vg@mail.gmail.com>
Date:   Tue, 4 Oct 2022 15:41:48 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Kees Cook <keescook@...omium.org>
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 8:26 PM Kees Cook <keescook@...omium.org> wrote:
>
> 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>

Wondering - did you ever queue this up for 6.1? I assume the plan is
to hold off on 2/2 for the time being, but this 1/2 is good to have
either way.

Jason