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

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Date:	Mon, 25 May 2015 11:12:57 +0300
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Alexander Popov <alpopov@...ecurity.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 05/22/2015 07:03 PM, Alexander Popov wrote:
> Physical addresses in KASan shadow region page tables need fixup:
> kernel halts without it if phys_base is not zero.
> 

Indeed.
Since we have to patch page tables anyway, compile-time created kasan
page tables become pointless.
So, I'd suggest to create them in runtime. This could be done in plain C
in kasan_map_early_shadow().


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