linux-kernel - Re: [PATCH v2] x86/floppy: use designated initializers

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Date:   Sun, 18 Dec 2016 09:00:28 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH v2] x86/floppy: use designated initializers


* Kees Cook <keescook@...omium.org> wrote:

> Prepare to mark sensitive kernel structures for randomization by making
> sure they're using designated initializers. These were identified during
> allyesconfig builds of x86, arm, and arm64, with most initializer fixes
> extracted from grsecurity.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> v2:
>  - aligned rhs of initializer, ingo
> ---
>  arch/x86/include/asm/floppy.h | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/x86/include/asm/floppy.h b/arch/x86/include/asm/floppy.h
> index 1c7eefe32502..202fe3e1fae8 100644
> --- a/arch/x86/include/asm/floppy.h
> +++ b/arch/x86/include/asm/floppy.h
> @@ -229,18 +229,18 @@ static struct fd_routine_l {
>  	int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
>  } fd_routine[] = {
>  	{
> -		request_dma,
> -		free_dma,
> -		get_dma_residue,
> -		dma_mem_alloc,
> -		hard_dma_setup
> +		._request_dma =		request_dma,
> +		._free_dma =		free_dma,
> +		._get_dma_residue =	get_dma_residue,
> +		._dma_mem_alloc =	dma_mem_alloc,
> +		._dma_setup =		hard_dma_setup
>  	},
>  	{
> -		vdma_request_dma,
> -		vdma_nop,
> -		vdma_get_dma_residue,
> -		vdma_mem_alloc,
> -		vdma_dma_setup
> +		._request_dma =		vdma_request_dma,
> +		._free_dma =		vdma_nop,
> +		._get_dma_residue =	vdma_get_dma_residue,
> +		._dma_mem_alloc =	vdma_mem_alloc,
> +		._dma_setup =		vdma_dma_setup

That's not how we organize named initializers, we do:

		._request_dma		= vdma_request_dma,
		._free_dma		= vdma_nop,
		._get_dma_residue	= vdma_get_dma_residue,
		._dma_mem_alloc		= vdma_mem_alloc,
		._dma_setup		= vdma_dma_setup

I have fixed up the patch.

Thanks,

	Ingo