linux-hardening - Re: [PATCH] [PATCH V4]ARM64: SCS: Add gcc plugin to support Shadow Call Stack

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Message-ID: <CAKwvOdmfbcT5bWhm5zVhuBRjx4PxLXY8dKUCV0JFrSKRy1Bpwg@mail.gmail.com>
Date:   Fri, 15 Oct 2021 12:10:49 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Dan Li <ashimida@...ux.alibaba.com>
Cc:     masahiroy@...nel.org, michal.lkml@...kovi.net,
        catalin.marinas@....com, will@...nel.org, keescook@...omium.org,
        nathan@...nel.org, tglx@...utronix.de, akpm@...ux-foundation.org,
        samitolvanen@...gle.com, frederic@...nel.org, rppt@...nel.org,
        mark.rutland@....com, yifeifz2@...inois.edu, rostedt@...dmis.org,
        viresh.kumar@...aro.org, andreyknvl@...il.com,
        colin.king@...onical.com, ojeda@...nel.org,
        luc.vanoostenryck@...il.com, elver@...gle.com,
        nivedita@...m.mit.edu, ardb@...nel.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-hardening@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] [PATCH V4]ARM64: SCS: Add gcc plugin to support Shadow
 Call Stack

On Fri, Oct 15, 2021 at 11:29 AM Dan Li <ashimida@...ux.alibaba.com> wrote:
>
>
>
> On 10/15/21 2:44 AM, Nick Desaulniers wrote:
> > Overall, I'm happy with the patch and am ready to ack it, but I would
> > like to see a link to to the upstream GCC feature request for SCS (and
> > one created if it doesn't exist) cited explicitly in the commit
> > message.  I think that would be a good demonstration that this can or
> > will be upstreamed into the compiler proper for the compiler vendors
> > to maintain, rather than the kernel folks.  The compiler vendors may
> > have further feedback on the approach, such as my question above
> > pertaining to inlining.
> >
> I have submitted a feature request to the gcc community, and waiting
> for a follow-up response.
>
> Is it fine to add the following description in [PATCH V5]?
>
> A similar feature request has also been sent to gcc.
> link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102768

Yes, and you can include
Acked-by: Nick Desaulniers <ndesaulniers@...gle.com>
too.

-- 
Thanks,
~Nick Desaulniers