linux-kernel - Re: [PATCH] x86: make sure IDT is page aligned

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Message-ID: <51E082F6.4030305@zytor.com>
Date:	Fri, 12 Jul 2013 15:28:06 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kees Cook <keescook@...omium.org>
CC:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Borislav Petkov <bp@...e.de>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Seiji Aguchi <seiji.aguchi@....com>,
	PaX Team <pageexec@...email.hu>
Subject: Re: [PATCH] x86: make sure IDT is page aligned

On 07/12/2013 11:30 AM, Kees Cook wrote:
>  
> -	.word 0				# 32-bit align idt_desc.address
> +	.word PAGE_SIZE			# page align idt_desc.address
> 

... and this is totally confused.  This didn't change alignment one
iota, it only put the value 4096 into the padding.

	-hpa

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