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Re: [PATCH 26/42] x86: remove not needed clear_page calling

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  Re: [PATCH 26/42] x86: remove not needed clear_page calling Kees Cook <keescook@chromium.org> - 2015-07-08 01:20 +0200

#1179153 — Re: [PATCH 26/42] x86: remove not needed clear_page calling

On Tue, Jul 7, 2015 at 1:20 PM, Yinghai Lu <yinghai@kernel.org> wrote:
> remove not needed clear_page for init_level4_page in x86_64_start_kernel(),
> as it is with fill 512,8,0 already in head_64.S

Will all possible entry points have come through head_64.S?

-Kees

>
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
> ---
>  arch/x86/kernel/head64.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
> index 44dc63b..a9f0299 100644
> --- a/arch/x86/kernel/head64.c
> +++ b/arch/x86/kernel/head64.c
> @@ -178,7 +178,6 @@ asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
>          */
>         load_ucode_bsp();
>
> -       clear_page(init_level4_pgt);
>         /* set init_level4_pgt kernel high mapping*/
>         init_level4_pgt[511] = early_level4_pgt[511];
>
> --
> 1.8.4.5
>
> --
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-- 
Kees Cook
Chrome OS Security
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