[PATCH v2 0/4] kasan: Fix ordering between MTE tag colouring and page->flags

[Andrey Konovalov]

On Fri, Feb 3, 2023 at 4:41 AM Kuan-Ying Lee (李冠穎)
<Kuan-Ying.Lee at mediatek.com> wrote:
>
> > Hi Kuan-Ying,
> >
> > There recently was a similar crash due to incorrectly implemented
> > sampling.
> >
> > Do you have the following patch in your tree?
> >
> >
> https://urldefense.com/v3/__https://android.googlesource.com/kernel/common/*/9f7f5a25f335e6e1484695da9180281a728db7e2__;Kw!!CTRNKA9wMg0ARbw!hUjRlXirPMSusdIWe0RIPt0PNqIHYDCJyd7GSd4o-TgLMP0CKRUkjElH-jcvtaz42-sgE2U58964rCCbuNTJE5Jx$
> >
> >
> > If not, please sync your 6.1 tree with the Android common kernel.
> > Hopefully this will fix the issue.
> >
> > Thanks!
>
> Hi Andrey,
>
> Thanks for your advice.
>
> I saw this patch is to fix ("kasan: allow sampling page_alloc
> allocations for HW_TAGS").
>
> But our 6.1 tree doesn't have following two commits now.
> ("FROMGIT: kasan: allow sampling page_alloc allocations for HW_TAGS")
> (FROMLIST: kasan: reset page tags properly with sampling)

Hi Kuan-Ying,

Just to clarify: these two patches were applied twice: once here on Jan 13:

https://android.googlesource.com/kernel/common/+/a2a9e34d164e90fc08d35fd097a164b9101d72ef
https://android.googlesource.com/kernel/common/+/435e2a6a6c8ba8d0eb55f9aaade53e7a3957322b

but then reverted here on Jan 20:

https://android.googlesource.com/kernel/common/+/5503dbe454478fe54b9cac3fc52d4477f52efdc9
https://android.googlesource.com/kernel/common/+/4573a3cf7e18735a477845426238d46d96426bb6

And then once again via the link I sent before together with a fix on Jan 25.

It might be that you still have to former two patches in your tree if
you synced it before the revert.

However, if this is not the case:

Which 6.1 commit is your tree based on?
Do you have any private MTE-related changes in the kernel?
Do you have userspace MTE enabled?

Thanks!