linux-kernel - Re: [RFC PATCH v3] UML: add support for KASAN under x86

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Date:   Fri, 27 May 2022 15:09:50 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     David Gow <davidgow@...gle.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Patricia Alfonso <trishalfonso@...gle.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        anton.ivanov@...bridgegreys.com,
        Brendan Higgins <brendanhiggins@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        linux-um@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
        Daniel Latypov <dlatypov@...gle.com>
Subject: Re: [RFC PATCH v3] UML: add support for KASAN under x86_64

On Fri, 27 May 2022 at 15:05, Johannes Berg <johannes@...solutions.net> wrote:
>
> On Wed, 2022-05-25 at 18:01 -0700, David Gow wrote:
> > From: Patricia Alfonso <trishalfonso@...gle.com>
> >
> > 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