[PATCH] kasan:fix access invalid shadow address when input is illegal

[Jann Horn]

On Fri, Sep 15, 2023 at 6:51 PM Andrey Konovalov <andreyknvl at gmail.com> wrote:
> On Fri, Sep 15, 2023 at 4:46 AM 'Haibo Li' via kasan-dev
> <kasan-dev at googlegroups.com> wrote:
> >
> > The patch checks each shadow address,so it introduces extra overhead.
>
> Ack. Could still be fine, depends on the overhead.
>
> But if the message printed by kasan_non_canonical_hook is good enough
> for your use case, I would rather stick to that.
>
> > Now kasan_non_canonical_hook only works for CONFIG_KASAN_INLINE.
> >
> > And CONFIG_KASAN_OUTLINE is set in my case.
> >
> > Is it possible to make kasan_non_canonical_hook works for both
> > INLINE and OUTLINE by simply remove the "#ifdef CONFIG_KASAN_INLINE"?
>
> Yes, it should just work if you remove the ifdefs in mm/kasan/report.c
> and in include/linux/kasan.h.
>
> Jann, do you have any objections to enabling kasan_non_canonical_hook
> for the outline mode too?

No objections from me.