linux-kernel - Re: [RFC PATCH v3 13/13] kasan: introduce inline instrumentation

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Message-id: <54296C62.2080604@samsung.com>
Date:	Mon, 29 Sep 2014 18:27:46 +0400
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Dmitry Vyukov <dvyukov@...gle.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Dave Jones <davej@...hat.com>,
	x86@...nel.org, "linux-mm@...ck.org" <linux-mm@...ck.org>,
	Michal Marek <mmarek@...e.cz>
Subject: Re: [RFC PATCH v3 13/13] kasan: introduce inline instrumentation

On 09/29/2014 06:28 PM, Dmitry Vyukov wrote:
> On Fri, Sep 26, 2014 at 9:33 PM, Andrey Ryabinin <ryabinin.a.a@...il.com> wrote:
>> 2014-09-26 21:18 GMT+04:00 Dmitry Vyukov <dvyukov@...gle.com>:
>>>
>>> Yikes!
>>> So this works during bootstrap, for user memory accesses, valloc
>>> memory, etc, right?
>>>
>>
>> Yes, this works. Userspace memory access in instrumented code will
>> produce general protection fault,
>> so it won't be unnoticed.
> 
> 
> Great!
> What happens during early bootstrap when shadow is not mapped yet?
> 

Shadow mapped very early. Any instrumented code executes only after shadow mapped.
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