linux-kernel - Re: [PATCH v4 1/2] kernel.h: Introduce const

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Message-ID: <CAGXu5j+Dv_wQgHWgT=9eSoKX7AcqnumuRsNFUoZ765WWizKytw@mail.gmail.com>
Date:   Thu, 15 Mar 2018 16:49:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Randy Dunlap <rdunlap@...radead.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        David Laight <David.Laight@...lab.com>,
        Ian Abbott <abbotti@....co.uk>,
        linux-input <linux-input@...r.kernel.org>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v4 1/2] kernel.h: Introduce const_max() for VLA removal

On Thu, Mar 15, 2018 at 4:46 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> What I'm *not* so much ok with is "const_max(5,sizeof(x))" erroring
> out, or silently causing insane behavior due to hidden subtle type
> casts..

Yup! I like it as an explicit argument. Thanks!

-Kees

-- 
Kees Cook
Pixel Security