linux-hardening - Re: [PATCH] [PATCH V5]ARM64: SCS: Add gcc plugin to support Shadow Call Stack

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Message-ID: <CANiq72k9GMuCtJq0=3Csk1yO8imGkveXJ5io0gjJH3+R73RRdg@mail.gmail.com>
Date:   Wed, 20 Oct 2021 01:14:44 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Dan Li <ashimida@...ux.alibaba.com>,
        Qing Zhao <qing.zhao@...cle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>, frederic@...nel.org,
        Mike Rapoport <rppt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, yifeifz2@...inois.edu,
        Steven Rostedt <rostedt@...dmis.org>,
        Viresh Kumar <viresh.kumar@...aro.org>, andreyknvl@...il.com,
        Colin King <colin.king@...onical.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Marco Elver <elver@...gle.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-hardening@...r.kernel.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        linux-toolchains@...r.kernel.org
Subject: Re: [PATCH] [PATCH V5]ARM64: SCS: Add gcc plugin to support Shadow
 Call Stack

On Tue, Oct 19, 2021 at 11:40 PM Kees Cook <keescook@...omium.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