From: Ingo Molnar <mingo@kernel.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Andrey Konovalov <andreyknvl@google.com>,
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Subject: Re: [RFC PATCH 00/14] khwasan: kernel hardware assisted address sanitizer
Date: Sun, 4 Mar 2018 12:44:39 +0100 [thread overview]
Message-ID: <20180304114439.zxksut65mefrpc7w@gmail.com> (raw)
In-Reply-To: <CAMuHMdX-3uFCagtnR5fuuU9wPJZ41D45pGi-gst7vtc0VT7zmA@mail.gmail.com>
* Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> Hi Andrey,
>
> On Fri, Mar 2, 2018 at 8:44 PM, Andrey Konovalov <andreyknvl@google.com> wrote:
> > This patchset adds a new mode to KASAN, which is called KHWASAN (Kernel
> > HardWare assisted Address SANitizer). There's still some work to do and
> > there are a few TODOs in the code, so I'm publishing this as a RFC to
> > collect some initial feedback.
> >
> > The plan is to implement HWASan [1] for the kernel with the incentive,
> > that it's going to have comparable performance, but in the same time
> > consume much less memory, trading that off for somewhat imprecise bug
> > detection and being supported only for arm64.
> >
> > The overall idea of the approach used by KHWASAN is the following:
> >
> > 1. By using the Top Byte Ignore arm64 CPU feature, we can store pointer
> > tags in the top byte of each kernel pointer.
>
> And for how long will this be OK?
Firstly it's not for production kernels, it's a hardware accelerator for an
intrusive debug feature, so it shouldn't really matter, right?
Secondly, if the top byte is lost and the other 56 bits can still be used that
gives a virtual memory space of up to 65,536 TB, which should be enough for a few
years in the arm64 space, right?
> Remembering:
> - AmigaBasic,
> - MacOS,
> - Emacs,
> - ...
> They all tried to use the same trick, and did regret...
> (AmigaBasic never survived this failure).
The 64-bit address space is really a lot larger, and it's a debug-info feature in
any case.
Thanks,
Ingo
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next prev parent reply other threads:[~2018-03-04 11:44 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
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 [this message]
2018-03-04 15:49 ` Geert Uytterhoeven
2018-03-06 18:21 ` Andrey Konovalov
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