linux-kernel - Re: [PATCH v2 05/17] add support for Clang's Shadow Call Stack (SCS)

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Message-ID: <CABCJKucUR=reCaOh_n8XGSZixmsckNtFXoaq_NOdB+iw-5UxMA@mail.gmail.com>
Date:   Mon, 28 Oct 2019 08:19:49 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Dave Martin <Dave.Martin@....com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 05/17] add support for Clang's Shadow Call Stack (SCS)

Hi Joe,

On Sat, Oct 26, 2019 at 8:57 AM Joe Perches <joe@...ches.com> wrote:
> > +#if __has_feature(shadow_call_stack)
> > +# define __noscs     __attribute__((no_sanitize("shadow-call-stack")))
>
> __no_sanitize__

Sorry, I missed your earlier message about this. I'm following Clang's
documentation for the attribute:

https://clang.llvm.org/docs/ShadowCallStack.html#attribute-no-sanitize-shadow-call-stack

Although __no_sanitize__ seems to work too. Is there a particular
reason to prefer that form over the one in the documentation?

Sami