linux-kernel - Re: [PATCH 3.16.y-ckt 172/254] x86, microcode: Fix accessing dis_ucode

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Message-ID: <20141127112035.GD8184@hercules>
Date:	Thu, 27 Nov 2014 11:20:35 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH 3.16.y-ckt 172/254] x86, microcode: Fix accessing
 dis_ucode_ldr on 32-bit

On Tue, Nov 25, 2014 at 10:38:42AM +0000, Luis Henriques wrote:
> 3.16.7-ckt2 -stable review patch.  If anyone has any objections, please let me know.
> 

As requested on the stable mailing-list, I'm dropping this patch from
the 3.16 queue.

Cheers,
--
Luís

> ------------------
> 
> From: Borislav Petkov <bp@...e.de>
> 
> commit 85be07c32496dc264661308e4d9d4e9ccaff8072 upstream.
> 
> We should be accessing it through a pointer, like on the BSP.
> 
> Tested-by: Richard Hendershot <rshendershot@...si.com>
> Fixes: 65cef1311d5d ("x86, microcode: Add a disable chicken bit")
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
> ---
>  arch/x86/kernel/cpu/microcode/core_early.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/microcode/core_early.c b/arch/x86/kernel/cpu/microcode/core_early.c
> index 5f28a64e71ea..2c017f242a78 100644
> --- a/arch/x86/kernel/cpu/microcode/core_early.c
> +++ b/arch/x86/kernel/cpu/microcode/core_early.c
> @@ -124,7 +124,7 @@ void __init load_ucode_bsp(void)
>  static bool check_loader_disabled_ap(void)
>  {
>  #ifdef CONFIG_X86_32
> -	return __pa_nodebug(dis_ucode_ldr);
> +	return *((bool *)__pa_nodebug(&dis_ucode_ldr));
>  #else
>  	return dis_ucode_ldr;
>  #endif
> -- 
> 2.1.0
> 
--
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