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Message-ID: <20200427170159.GA236495@google.com>
Date: Mon, 27 Apr 2020 10:01:59 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Will Deacon <will@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
James Morse <james.morse@....com>,
Steven Rostedt <rostedt@...dmis.org>,
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>,
clang-built-linux <clang-built-linux@...glegroups.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v13 01/12] add support for Clang's Shadow Call Stack (SCS)
On Mon, Apr 27, 2020 at 06:48:49PM +0200, Miguel Ojeda wrote:
> On Mon, Apr 27, 2020 at 6:00 PM Sami Tolvanen <samitolvanen@...gle.com> wrote:
> >
> > diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
> > index 333a6695a918..18fc4d29ef27 100644
> > --- a/include/linux/compiler-clang.h
> > +++ b/include/linux/compiler-clang.h
> > @@ -42,3 +42,9 @@
> > * compilers, like ICC.
> > */
> > #define barrier() __asm__ __volatile__("" : : : "memory")
> > +
> > +#if __has_feature(shadow_call_stack)
> > +# define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
> > +#else
> > +# define __noscs
> > +#endif
>
> Can we remove the `#else` branch? compiler_types.h [*] has to care
> anyway about that case for other compilers anyway, no?
Yes, it's unnecessary. I'll remove this in the next version. Thanks!
Sami
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