Messages in this thread | | | From | Andrey Konovalov <> | Date | Fri, 22 Jan 2021 15:42:02 +0100 | Subject | Re: [PATCH v7 3/4] kasan: Add report for async mode |
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On Fri, Jan 22, 2021 at 3:11 PM Vincenzo Frascino <vincenzo.frascino@arm.com> wrote: > > KASAN provides an asynchronous mode of execution. > > Add reporting functionality for this mode. > > Cc: Dmitry Vyukov <dvyukov@google.com> > Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> > Cc: Alexander Potapenko <glider@google.com> > Cc: Andrey Konovalov <andreyknvl@google.com> > Reviewed-by: Andrey Konovalov <andreyknvl@google.com> > Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> > --- > include/linux/kasan.h | 2 ++ > mm/kasan/report.c | 13 +++++++++++++ > 2 files changed, 15 insertions(+) > > diff --git a/include/linux/kasan.h b/include/linux/kasan.h > index bb862d1f0e15..b0a1d9dfa85c 100644 > --- a/include/linux/kasan.h > +++ b/include/linux/kasan.h > @@ -351,6 +351,8 @@ static inline void *kasan_reset_tag(const void *addr) > bool kasan_report(unsigned long addr, size_t size, > bool is_write, unsigned long ip); > > +void kasan_report_async(void); > + > #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ > > static inline void *kasan_reset_tag(const void *addr) > diff --git a/mm/kasan/report.c b/mm/kasan/report.c > index 234f35a84f19..1390da06a988 100644 > --- a/mm/kasan/report.c > +++ b/mm/kasan/report.c > @@ -358,6 +358,19 @@ void kasan_report_invalid_free(void *object, unsigned long ip) > end_report(&flags); > } > > +#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
This looks wrong, CONFIG_KASAN_SW_TAGS doesn't use MTE, so this function isn't needed for that mode.
Let's add an #ifdef CONFIG_KASAN_HW_TAGS section in include/linux/kasan.h after the HW/SW one with kasan_report(). And only leave CONFIG_KASAN_HW_TAGS in mm/kasan/report.c too.
> +void kasan_report_async(void) > +{ > + unsigned long flags; > + > + start_report(&flags); > + pr_err("BUG: KASAN: invalid-access\n"); > + pr_err("Asynchronous mode enabled: no access details available\n"); > + dump_stack(); > + end_report(&flags); > +} > +#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ > + > static void __kasan_report(unsigned long addr, size_t size, bool is_write, > unsigned long ip) > { > -- > 2.30.0 >
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