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

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Message-ID: <CACT4Y+ZVPV51vBDKTQ-snQ360kTc6axNS1g_02EA0h75Gqd3Bw@mail.gmail.com>
Date:	Mon, 29 Sep 2014 18:28:06 +0400
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	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 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?
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