linux-kernel - Re: [PATCH v11 01/12] add support for Clang's Shadow Call Stack (SCS)

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Date:   Mon, 20 Apr 2020 21:12:01 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Will Deacon <will@...nel.org>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dave Martin <Dave.Martin@....com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        clang-built-linux@...glegroups.com,
        kernel-hardening@...ts.openwall.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 01/12] add support for Clang's Shadow Call Stack
 (SCS)

On Mon, 20 Apr 2020 18:17:28 +0100
Will Deacon <will@...nel.org> wrote:

> > +ifdef CONFIG_SHADOW_CALL_STACK
> > +CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
> > +KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
> > +export CC_FLAGS_SCS
> > +endif  
> 
> CFLAGS_SCS would seem more natural to me, although I see ftrace does it this
> way.

The CC_FLAGS_FTRACE was added by Heiko Carstens, and the "CC_FLAGS_"
appears to be a common usage in s390 :-)

That said, I like the CC_FLAGS_ notation, because the Linux build
system uses CFLAGS_* as commands:

  CFLAGS_foo.o = x
  CFLAGS_REMOVE_foo.o = y

And "CC_FLAGS_" is only for new flags and easy to search for.

-- Steve