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

From	Ingo Molnar <mingo@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v6 1/1] x86_64: fix KASan shadow region page tables
Date	2015-06-19 16:10 +0200
Message-ID	<pD59w-1ao-5@gated-at.bofh.it> (permalink)
References	(4 earlier) <pCKy7-4Yo-21@gated-at.bofh.it> <pCL19-5wm-33@gated-at.bofh.it> <pD2Y2-6iG-1@gated-at.bofh.it> <pD3ho-6UC-19@gated-at.bofh.it> <pD4Gu-n9-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

* Andrey Ryabinin <a.ryabinin@samsung.com> wrote:

> 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.

It should also printk a one line message at bootup, so that people can be sure 
they are running a KASan-enabled kernel.

> To make sure that it works you could try to load testing module (CONFIG_TEST_KASAN).
> This module has bugs that kasan should catch.

That's a way too obscure mechanism just to determine whether the right kernel 
config was booted. Please add a printk(), ok?

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
Please read the FAQ at  http://www.tux.org/lkml/

Thread

[PATCH v6 1/1] x86_64: fix KASan shadow region page tables Alexander Popov <alpopov@ptsecurity.com> - 2015-06-18 09:40 +0200
  Re: [PATCH v6 1/1] x86_64: fix KASan shadow region page tables Andrey Ryabinin <a.ryabinin@samsung.com> - 2015-06-19 15:40 +0200
    Re: [PATCH v6 1/1] x86_64: fix KASan shadow region page tables Borislav Petkov <bp@alien8.de> - 2015-06-19 16:10 +0200
    Re: [PATCH v6 1/1] x86_64: fix KASan shadow region page tables Ingo Molnar <mingo@kernel.org> - 2015-06-19 16:10 +0200
      Re: [PATCH v6 1/1] x86_64: fix KASan shadow region page tables Andrey Ryabinin <a.ryabinin@samsung.com> - 2015-06-19 16:20 +0200

csiph-web