linux-kernel - Re: [PATCH v6 1/1] x86_64: fix KASan shadow region page tables

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Date:	Fri, 19 Jun 2015 16:36:15 +0300
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Alexander Popov <alpopov@...ecurity.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Alexander Kuleshov <kuleshovmail@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/1] x86_64: fix KASan shadow region page tables

On 06/19/2015 03:06 PM, Borislav Petkov wrote:
> On Fri, Jun 19, 2015 at 02:49:19PM +0300, Andrey Ryabinin wrote:
>> I guess that AMD cpus is more strict (unlike Intel) about violation
>> of reserved/unused bits in page table entries. Please, try with this
>> patch.
> 
> With that the guest boots.
> 

Great! Thanks.

> How do I check whether KASan actually works? I don't see any note in
> dmesg or some file named "*kasan*" in sysfs...
> 

kasan will print report in dmesg whant it will find anything.

To make sure that it works you could try to load testing module (CONFIG_TEST_KASAN).
This module has bugs that kasan should catch.
Also 'slub_debug=U' in bootcmdline will improve reports and out-of-bounds accesses detection.

> Thanks.
> 

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