Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
In-Reply-To: <0e94e9582bec4373b5e21c612be179ac@AcuMS.aculab.com>
References: <1521174359-46392-1-git-send-email-keescook@chromium.org>
 <ab2933a2-ca7b-eb3b-744d-bc037b1be688@redhat.com> <CA+55aFx92dXg-qnrjGS2Rsna6TE5HSPBgGpSA3cv4n_n3RqBzA@mail.gmail.com>
 <20180316175502.GE30522@ZenIV.linux.org.uk> <CA+55aFzsrVF7W+YQye=EeF4Wk3yDOTbb_vSiM8s1zkKbE4JV4Q@mail.gmail.com>
 <CAGXu5jJmAAgaq3VCsUN2yjpHLSc7P-kNrM_4c4cqP=ysFcETXA@mail.gmail.com>
 <CA+55aFwv0VC67cx2W9yrf7qSFKf6ncVRrsVyLGqdmfSBn4yTYw@mail.gmail.com>
 <42b4342b-aefc-a16a-0d43-9f9c0d63ba7a@rasmusvillemoes.dk> <CA+55aFwFoTapX2niPiaET5kg7K85qxhav1_PoDDxY0o_VRA5Ag@mail.gmail.com>
 <38b6da49-1138-017e-7307-f39ff067d6d2@rasmusvillemoes.dk> <CA+55aFw0WC+S3TTE6x_vkLbRV6YLeR4-1S9LsBXhE+E2KZqBuA@mail.gmail.com>
 <0e94e9582bec4373b5e21c612be179ac@AcuMS.aculab.com>
From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon, 19 Mar 2018 16:29:28 -0700
Message-ID: <CA+55aFwZnkR5uA5Oe19Xzox=+Bcab-j6-+a=XGqS8yokDU3Dog@mail.gmail.com>
Subject: Re: [PATCH v5 0/2] Remove false-positive VLAs when using max()
To:     David Laight <David.Laight@aculab.com>
Cc:     Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Kees Cook <keescook@chromium.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Florian Weimer <fweimer@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
        Ingo Molnar <mingo@kernel.org>, Ian Abbott <abbotti@mev.co.uk>,
        linux-input <linux-input@vger.kernel.org>,
        linux-btrfs <linux-btrfs@vger.kernel.org>,
        Network Development <netdev@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Kernel Hardening <kernel-hardening@lists.openwall.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Mar 19, 2018 at 2:43 AM, David Laight <David.Laight@aculab.com> wrote:
>
> Is it necessary to have the full checks for old versions of gcc?
>
> Even -Wvla could be predicated on very recent gcc - since we aren't
> worried about whether gcc decides to generate a vla, but whether
> the source requests one.

You are correct. We could just ignore the issue with old gcc versions,
and disable -Wvla rather than worry about it.

                  Linus