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Date: Fri, 19 Jun 2015 16:36:15 +0300
From: Andrey Ryabinin <a.ryabinin@samsung.com>
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To: Borislav Petkov <bp@alien8.de>
Cc: Alexander Popov <alpopov@ptsecurity.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andrey Konovalov <adech.fo@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@kernel.org>,
        Alexander Kuleshov <kuleshovmail@gmail.com>,
        Denys Vlasenko <dvlasenk@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Kees Cook <keescook@chromium.org>, x86@kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 1/1] x86_64: fix KASan shadow region page tables
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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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