linux-kernel - Re: [PATCH 1/1] x86_64: fix KASan shadow region page tables

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Date:	Thu, 28 May 2015 11:56:48 +0300
From:	Alexander Popov <alpopov@...ecurity.com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	"Denys Vlasenko" <dvlasenk@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Alexander Kuleshov <kuleshovmail@...il.com>,
	Sergey Kovalev <SKovalev@...ecurity.com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] x86_64: fix KASan shadow region page tables

On 26.05.2015 11:52, Andrey Ryabinin wrote:
> On 05/25/2015 04:43 PM, Alexander Popov wrote:
>> What do you think about leaving the initialization of KASan shadow region
>> page tables in arch/x86/kernel/head_64.S and calling something like
>> kasan_fixup_early_shadow() before calling kasan_map_early_shadow()
>> for the first time?
> 
> Why do we have initialize + fixup later if we could simply initialize page tables properly?
> 
> Just move everything into kasan_init_64.c
> kasan_zero_p* could be a normal C arrays (with __page_aligned_bss attribute).
> Initialize these page tables in something like kasan_early_init() before kasan_map_early_shadow()
> call.

Thanks, I'll do that and return with the second version.

Best regards,
Alexander

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