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

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Message-ID: <CABCJKueb=xZzXBegc58aWRqPq6eCOpBf7uyyzVyNMujDSHhm1g@mail.gmail.com>
Date:   Thu, 24 Oct 2019 15:17:08 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Dave Martin <Dave.Martin@....com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Nick Desaulniers <ndesaulniers@...gle.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 06/18] add support for Clang's Shadow Call Stack (SCS)

On Thu, Oct 24, 2019 at 5:04 AM Steven Rostedt <rostedt@...dmis.org> wrote:
> You can remove a CFLAGS for a whole directory. lib, kernel/trace and
> others do this. Look at kernel/trace/Makefile, we have:
>
> ORIG_CFLAGS := $(KBUILD_CFLAGS)
> KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))

That definitely looks less invasive in this case than adding
ccflags-remove-y, since we only really need this for one directory.
I'll use this in v2. Thanks, Steven.

Sami