From: Evgenii Stepanov <eugenis@google.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>,
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Mark Brand <markbrand@google.com>
Subject: Re: [RFC PATCH 09/14] khwasan: add hooks implementation
Date: Fri, 16 Mar 2018 11:16:57 -0700 [thread overview]
Message-ID: <CAFKCwriP6KY6PaHheZi9gLVebKp-rLa-gATSSE3R-fhrRYex3A@mail.gmail.com> (raw)
In-Reply-To: <CAAeHK+xNjYOAhLBogYYfXi+KiFf9SDYGoaV6og=aRmuB7rhvHg@mail.gmail.com>
On Fri, Mar 16, 2018 at 11:09 AM, Andrey Konovalov
<andreyknvl@google.com> wrote:
> On Thu, Mar 15, 2018 at 5:52 PM, Andrey Ryabinin
> <aryabinin@virtuozzo.com> wrote:
>> On 03/13/2018 08:00 PM, Andrey Konovalov wrote:
>>> On Tue, Mar 13, 2018 at 4:05 PM, 'Alexander Potapenko' via kasan-dev
>>> <kasan-dev@googlegroups.com> wrote:
>>>> Does it make sense to generate the redzone tag from the object tag
>>>> (e.g. by addding 1 to it)?
>>>
>>> Yes, I think so, will do!
>>>
>>
>> Wouldn't be better to have some reserved tag value for invalid memory (redzones/free), so that
>> we catch access to such memory with 100% probability?
>
> We could do that. That would reduce the chance to detect a
> use-after-free though, since we're using fewer different tag values
> for the objects themselves. I don't have a strong opinion about which
> one is better though.
hwasan does not need redzones. As for use-after-free, to catch it with
100% probability one would need infinite memory for the quarantine. It
is possible to guarantee 100% detection of linear buffer overflow by
giving live adjacent chunks distinct tags.
next prev parent reply other threads:[~2018-03-16 18:16 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
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 [this message]
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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