linux-hardening - Re: [PATCH v4 10/15] x86/purgatory: Disable CFI

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Date:   Thu, 30 Sep 2021 12:05:58 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     x86@...nel.org, Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Sedat Dilek <sedat.dilek@...il.com>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v4 10/15] x86/purgatory: Disable CFI

On Thu, Sep 30, 2021 at 11:06 AM Sami Tolvanen <samitolvanen@...gle.com> wrote:
>
> Disable CONFIG_CFI_CLANG for the stand-alone purgatory.ro.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  arch/x86/purgatory/Makefile | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
> index 95ea17a9d20c..911954fec31c 100644
> --- a/arch/x86/purgatory/Makefile
> +++ b/arch/x86/purgatory/Makefile
> @@ -55,6 +55,10 @@ ifdef CONFIG_RETPOLINE
>  PURGATORY_CFLAGS_REMOVE                += $(RETPOLINE_CFLAGS)
>  endif
>
> +ifdef CONFIG_CFI_CLANG
> +PURGATORY_CFLAGS_REMOVE                += $(CC_FLAGS_CFI)
> +endif
> +
>  CFLAGS_REMOVE_purgatory.o      += $(PURGATORY_CFLAGS_REMOVE)
>  CFLAGS_purgatory.o             += $(PURGATORY_CFLAGS)
>
> --
> 2.33.0.800.g4c38ced690-goog
>


-- 
Thanks,
~Nick Desaulniers