linux-kernel - Re: [PATCH v4 1/1] x86_64: fix KASan shadow region page tables

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Date:	Wed, 3 Jun 2015 11:37:23 +0300
From:	Alexander Popov <alpopov@...ecurity.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Andy Lutomirski <luto@...capital.net>,
	Alexander Kuleshov <kuleshovmail@...il.com>,
	"Borislav Petkov" <bp@...e.de>,
	Denys Vlasenko <dvlasenk@...hat.com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/1] x86_64: fix KASan shadow region page tables

On 03.06.2015 10:44, Ingo Molnar wrote:
> 
> * Alexander Popov <alpopov@...ecurity.com> wrote:
>> +	kasan_early_init();
>> +	kasan_map_early_shadow(early_level4_pgt);
> 
> So why isn't kasan_map_early_shadow() called in kasan_early_init()?
> 
> High level x86 init code should not be polluted with too many low level details.

Hello, Ingo.

kasan_map_early_shadow() is called twice in x86_64_start_kernel():
once for early_level4_pgt and then later for init_level4_pgt.

I've decided to introduce separate kasan_early_init() to avoid big changes
which can bring consequences that I don't understand.

Best regards,
Alexander
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