Hi Andrey,
On Fri, Mar 2, 2018 at 8:44 PM, Andrey Konovalov <andreyknvl@xxxxxxxxxx> 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?
Remembering:
- AmigaBasic,
- MacOS,
- Emacs,
- ...
They all tried to use the same trick, and did regret...
(AmigaBasic never survived this failure).
"Those who don't know history are doomed to repeat it."
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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