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Message-ID: <5566D850.8090605@ptsecurity.com>
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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