Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <1634337180-92127-1-git-send-email-ashimida@linux.alibaba.com> <202110191006.68BB660@keescook>
In-Reply-To: <202110191006.68BB660@keescook>
From:   Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Date:   Wed, 20 Oct 2021 01:14:44 +0200
Message-ID: <CANiq72k9GMuCtJq0=3Csk1yO8imGkveXJ5io0gjJH3+R73RRdg@mail.gmail.com>
Subject: Re: [PATCH] [PATCH V5]ARM64: SCS: Add gcc plugin to support Shadow
 Call Stack
To:     Kees Cook <keescook@chromium.org>
Cc:     Dan Li <ashimida@linux.alibaba.com>,
        Qing Zhao <qing.zhao@oracle.com>,
        Sami Tolvanen <samitolvanen@google.com>,
        Ard Biesheuvel <ardb@kernel.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>, frederic@kernel.org,
        Mike Rapoport <rppt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>, yifeifz2@illinois.edu,
        Steven Rostedt <rostedt@goodmis.org>,
        Viresh Kumar <viresh.kumar@linaro.org>, andreyknvl@gmail.com,
        Colin King <colin.king@canonical.com>,
        Miguel Ojeda <ojeda@kernel.org>,
        Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
        Marco Elver <elver@google.com>,
        Arvind Sankar <nivedita@alum.mit.edu>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        linux-hardening@vger.kernel.org,
        clang-built-linux <clang-built-linux@googlegroups.com>,
        linux-toolchains@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Tue, Oct 19, 2021 at 11:40 PM Kees Cook <keescook@chromium.org> wrote:
>
> Anyway, this is a long way to say that I don't think I want to add
> a new gcc-plugin when it is at "State 2" (i.e. Clang has support but
> GCC doesn't.) There's no need to "prove" that the compiler feature is
> generally desirable, so it's best to get this into GCC directly.

Sounds reasonable.

Cc'ing linux-toolchains, by the way.

Cheers,
Miguel