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Date: Tue, 6 Jun 2017 17:13:07 +0000
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: Kees Cook <keescook@...omium.org>,
Mark Rutland <mark.rutland@....com>,
Matt Fleming <matt@...eblueprint.co.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/6] efi: Avoid fortify checks in EFI stub
(+ Mark, Matt)
On 6 June 2017 at 04:52, Kees Cook <keescook@...omium.org> wrote:
> This avoids CONFIG_FORTIFY_SOURCE from being enabled during the EFI stub
> build, as adding a panic() implementation may not work well. This can be
> adjusted in the future.
>
> Suggested-by: Daniel Micay <danielmicay@...il.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Cc; Matt Fleming <matt@...eblueprint.co.uk>
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> ---
> drivers/firmware/efi/libstub/Makefile | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
> index f7425960f6a5..37e24f525162 100644
> --- a/drivers/firmware/efi/libstub/Makefile
> +++ b/drivers/firmware/efi/libstub/Makefile
> @@ -17,6 +17,7 @@ cflags-$(CONFIG_ARM) := $(subst -pg,,$(KBUILD_CFLAGS)) \
> cflags-$(CONFIG_EFI_ARMSTUB) += -I$(srctree)/scripts/dtc/libfdt
>
> KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
> + -D__NO_FORTIFY \
> $(call cc-option,-ffreestanding) \
> $(call cc-option,-fno-stack-protector)
>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
This is unlikely to conflict with anything going through the EFI tree,
so feel free to queue it elsewhere.
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