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

From: Andrey Ryabinin
Date: Fri Jun 19 2015 - 09:36:32 EST

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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