linux-kernel - Re: [PATCH] efi: x86: Fix config name for setting the NX-compatibility flag in the PE header

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Date:   Wed, 1 Jun 2022 14:02:52 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc:     Peter Jones <pjones@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        X86 ML <x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>,
        kernel-janitors@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] efi: x86: Fix config name for setting the
 NX-compatibility flag in the PE header

On Wed, 1 Jun 2022 at 13:51, Lukas Bulwahn <lukas.bulwahn@...il.com> wrote:
>
> Commit 21b68da7bf4a ("efi: x86: Set the NX-compatibility flag in the PE
> header") intends to set the compatibility flag, i.e.,
> IMAGE_DLL_CHARACTERISTICS_NX_COMPAT, but this ifdef is actually dead as the
> CONFIG_DXE_MEM_ATTRIBUTES does not exist.
>
> The config is actually called EFI_DXE_MEM_ATTRIBUTES. Adjust the ifdef to
> use the intended config name.
>
> The issue was identified with ./scripts/checkkconfigsymbols.py.
>
> Fixes: 21b68da7bf4a ("efi: x86: Set the NX-compatibility flag in the PE header")
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> ---
> Peter, please review and ack.
> Ard, please pick this fix-up patch.
>

Thanks, Lukas, I'll queue this up.

>  arch/x86/boot/header.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
> index 0352e4589efa..f912d7770130 100644
> --- a/arch/x86/boot/header.S
> +++ b/arch/x86/boot/header.S
> @@ -163,7 +163,7 @@ extra_header_fields:
>         .long   0x200                           # SizeOfHeaders
>         .long   0                               # CheckSum
>         .word   IMAGE_SUBSYSTEM_EFI_APPLICATION # Subsystem (EFI application)
> -#ifdef CONFIG_DXE_MEM_ATTRIBUTES
> +#ifdef CONFIG_EFI_DXE_MEM_ATTRIBUTES
>         .word   IMAGE_DLL_CHARACTERISTICS_NX_COMPAT     # DllCharacteristics
>  #else
>         .word   0                               # DllCharacteristics
> --
> 2.17.1
>