Re: [RFC PATCH v3] UML: add support for KASAN under x86_64

[Dmitry Vyukov]

On Fri, 27 May 2022 at 15:05, Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote:
>
> On Wed, 2022-05-25 at 18:01 -0700, David Gow wrote:
> > From: Patricia Alfonso <trishalfonso@xxxxxxxxxx>
> >
> > Make KASAN run on User Mode Linux on x86_64.
>
> FWIW, I just added this to my virtual lab which I use as CI tests, and
> it immediately found a use-after-free bug in mac80211!
>
> I did note (this is more for kasan-dev@) that the "freed by" is fairly
> much useless when using kfree_rcu(), it might be worthwhile to annotate
> that somehow, so the stack trace is recorded by kfree_rcu() already,
> rather than just showing the RCU callback used for that.

KASAN is doing it for several years now, see e.g.:
https://groups.google.com/g/syzkaller-bugs/c/eTW9zom4O2o/m/_v7cOo2RFwAJ