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From:   Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Date:   Sun, 10 Oct 2021 17:43:01 +0200
Message-ID: <CANiq72nBqiyrcaW47ZW-6i7zJ6HrmjZWSOr==HkEuBR5rXmpdQ@mail.gmail.com>
Subject: Re: [PATCH] [PATCH V2]ARM64: SCS: Add gcc plugin to support Shadow
 Call Stack
To:     Dan Li <ashimida@linux.alibaba.com>
Cc:     Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Sami Tolvanen <samitolvanen@google.com>, 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>,
        Ard Biesheuvel <ardb@kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
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On Sun, Oct 10, 2021 at 5:16 PM Dan Li <ashimida@linux.alibaba.com> wrote:
>
> -         This option enables Clang's Shadow Call Stack, which uses a
> -         shadow stack to protect function return addresses from being
> -         overwritten by an attacker. More information can be found in
> -         Clang's documentation:
> +         This option enables Clang/GCC plugin's Shadow Call Stack, which
> +         uses a shadow stack to protect function return addresses from
> +         being overwritten by an attacker. More information can be found
> +         in Clang's documentation:

Perhaps it could be worded in a better way? It sounds like it is a
custom plugin for Clang as well, e.g.:

    This option enables Shadow Call Stack (in the case of GCC, as a plugin),

Cheers,
Miguel