From: Marc Zyngier <marc.zyngier@arm.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
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Subject: Re: [RFC PATCH 06/14] khwasan: enable top byte ignore for the kernel
Date: Fri, 9 Mar 2018 19:06:01 +0000 [thread overview]
Message-ID: <cd5c305a-407d-3dcd-7c4e-7a3bc13b0da9@arm.com> (raw)
In-Reply-To: <CAAeHK+zyGQtNxap6N5s11MWrQS-Y_uA7TRQnh5oP=HWZjPytsw@mail.gmail.com>
On 09/03/18 18:42, Andrey Konovalov wrote:
> On Fri, Mar 9, 2018 at 7:32 PM, Marc Zyngier <marc.zyngier@arm.com> wrote:
>> Well, that's not quite how it works. KVM is an integral part of the
>> kernel, and I don't really want to have to deal with regression (not to
>> mention that KVM is an essential tool in our testing infrastructure).
>>
>> You could try and exclude KVM from the instrumentation (which we already
>> have for invasive things such as KASAN), but I'm afraid that having a
>> debugging option that conflicts with another essential part of the
>> kernel is not an option.
>>
>> I'm happy to help you with that though.
>>
>
> Hm, KHWASAN instruments the very same parts of the kernel that KASAN
> does (it reuses the same flag). I've checked, I actually have
> CONFIG_KVM enabled in my test build, however I haven't tried to test
> KVM yet. I'm planning to perform extensive fuzzing of the kernel with
> syzkaller, so if there's any crashes caused by KHWASAN in kvm code
> I'll see them. However if some bugs don't manifest as crashes, that
> would be a difficult thing to detect for me.
Well, if something is wrong in KVM, it usually manifests itself
extremely quickly, and takes the whole box with it. I have the ugly
feeling that feeding coloured pointers to KVM is going to be a fun ride
though.
Also, last time I checked Clang couldn't even compile KVM correctly.
Hopefully, things have changed...
Thanks,
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2018-03-09 19:06 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-02 19:44 [RFC PATCH 00/14] khwasan: kernel hardware assisted address sanitizer Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 01/14] khwasan: change kasan hooks signatures Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 02/14] khwasan: move common kasan and khwasan code to common.c Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 03/14] khwasan: add CONFIG_KASAN_CLASSIC and CONFIG_KASAN_TAGS Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 04/14] khwasan: adjust shadow size for CONFIG_KASAN_TAGS Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 05/14] khwasan: initialize shadow to 0xff Andrey Konovalov
2018-03-02 21:55 ` Evgenii Stepanov
2018-03-02 19:44 ` [RFC PATCH 06/14] khwasan: enable top byte ignore for the kernel Andrey Konovalov
2018-03-05 14:29 ` Mark Rutland
2018-03-09 18:15 ` Andrey Konovalov
2018-03-05 14:36 ` Mark Rutland
2018-03-06 14:24 ` Marc Zyngier
2018-03-09 18:21 ` Andrey Konovalov
2018-03-09 18:32 ` Marc Zyngier
2018-03-09 18:42 ` Andrey Konovalov
2018-03-09 19:06 ` Marc Zyngier [this message]
2018-03-09 19:16 ` Mark Rutland
2018-03-09 19:14 ` Mark Rutland
2018-03-09 18:17 ` Andrey Konovalov
2018-03-09 18:59 ` Mark Rutland
2018-03-02 19:44 ` [RFC PATCH 07/14] khwasan: add tag related helper functions Andrey Konovalov
2018-03-05 14:32 ` Mark Rutland
2018-03-06 18:31 ` Andrey Konovalov
2018-03-07 18:16 ` Christopher Lameter
2018-03-08 9:09 ` Dmitry Vyukov
2018-03-08 11:20 ` Mark Rutland
2018-03-02 19:44 ` [RFC PATCH 08/14] khwasan: perform untagged pointers comparison in krealloc Andrey Konovalov
2018-03-05 14:39 ` Mark Rutland
2018-03-06 18:33 ` Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 09/14] khwasan: add hooks implementation Andrey Konovalov
2018-03-05 14:44 ` Mark Rutland
2018-03-06 18:38 ` Andrey Konovalov
2018-03-08 11:25 ` Mark Rutland
2018-03-09 18:10 ` Andrey Konovalov
2018-03-13 15:05 ` Alexander Potapenko
2018-03-13 17:00 ` Andrey Konovalov
2018-03-15 16:52 ` Andrey Ryabinin
2018-03-16 18:09 ` Andrey Konovalov
2018-03-16 18:16 ` Evgenii Stepanov
2018-03-16 18:24 ` Andrey Konovalov
2018-03-16 18:45 ` Evgenii Stepanov
2018-03-16 19:06 ` Andrey Konovalov
2018-03-16 20:21 ` Evgenii Stepanov
2018-03-20 0:44 ` Anthony Yznaga
2018-03-20 13:43 ` Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 10/14] khwasan: add bug reporting routines Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 11/14] khwasan: add brk handler for inline instrumentation Andrey Konovalov
2018-03-05 14:51 ` Mark Rutland
2018-03-23 15:59 ` Andrey Konovalov
2018-03-24 3:42 ` Ard Biesheuvel
2018-03-26 9:36 ` Mark Rutland
2018-03-27 13:03 ` Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 12/14] khwasan, jbd2: add khwasan annotations Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 13/14] khwasan: update kasan documentation Andrey Konovalov
2018-03-02 19:44 ` [RFC PATCH 14/14] khwasan: default the instrumentation mode to inline Andrey Konovalov
2018-03-05 14:54 ` Mark Rutland
2018-03-09 18:06 ` Andrey Konovalov
2018-03-09 19:18 ` Mark Rutland
2018-03-12 13:10 ` Andrey Konovalov
2018-03-13 14:44 ` Alexander Potapenko
2018-03-13 16:49 ` Andrey Konovalov
2018-03-04 9:16 ` [RFC PATCH 00/14] khwasan: kernel hardware assisted address sanitizer Geert Uytterhoeven
2018-03-04 11:44 ` Ingo Molnar
2018-03-04 15:49 ` Geert Uytterhoeven
2018-03-06 18:21 ` Andrey Konovalov
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