linux-kernel - Re: [PATCH 06/18] add support for Clang's Shadow Call Stack (SCS)

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Message-ID: <CANiq72m_+YLLWuRGi=yZBAUj2WHSbw9E+jQ02LbXyq3b12Vb6g@mail.gmail.com>
Date:   Sat, 19 Oct 2019 02:21:44 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Steven Rostedt <rostedt@...dmis.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>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/18] add support for Clang's Shadow Call Stack (SCS)

On Fri, Oct 18, 2019 at 10:33 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> Sami pointed out to me off thread that __has_attribute would only
> check `no_sanitize`, not `shadow-call-stack`.  So maybe best to keep
> the definition here (include/linux/compiler-clang.h), but wrapped in a
> `__has_feature` check so that Clang 6.0 doesn't start complaining.

Ah, good point -- agreed!

Cheers,
Miguel