Re: [PATCH v4 5/5] arm64: Kconfig: select KASAN_VMALLOC if KANSAN_GENERIC is enabled

[Andrey Konovalov]

On Tue, Mar 30, 2021 at 10:14 AM Lecopzer Chen
<lecopzer.chen@xxxxxxxxxxxx> wrote:
>
> > Do you know if anybody is working on this? It's really unfortunate that
> > we can't move exclusively to VMAP_STACK just because of SW_TAGS KASAN.
> >
> > That said, what is there to do? As things stand, won't kernel stack
> > addresses end up using KASAN_TAG_KERNEL?
>
> Hi Andrey,
>
> Do you or any KASAN developers have already had any plan for this?

Hi Will and Lecopzer,

We have an issue open to track this [1], but no immediate plans to work on this.

Now that we have GENERIC vmalloc support for arm64, there's a chance
that SW_TAGS vmalloc will just work once allowed via configs. However,
I would expect that we'll still need to at least add some
kasan_reset_tag() annotations here and there.

Thanks!

[1] https://bugzilla.kernel.org/show_bug.cgi?id=211777