[PATCH v2 11/14] kasan: fix bug detection via ksize for HW_TAGS mode

[Marco Elver]

On Thu, 14 Jan 2021 at 19:01, 'Andrey Konovalov' via kasan-dev
<kasan-dev at googlegroups.com> wrote:
> On Wed, Jan 13, 2021 at 5:54 PM Marco Elver <elver at google.com> wrote:
> >
> > > +/*
> > > + * Unlike kasan_check_read/write(), kasan_check_byte() is performed even for
> > > + * the hardware tag-based mode that doesn't rely on compiler instrumentation.
> > > + */
> > > +bool __kasan_check_byte(const void *addr, unsigned long ip);
> > > +static __always_inline bool kasan_check_byte(const void *addr, unsigned long ip)
> > > +{
> > > +       if (kasan_enabled())
> > > +               return __kasan_check_byte(addr, ip);
> > > +       return true;
> > > +}
> >
> > Why was this not added to kasan-checks.h? I'd assume including all of
> > kasan.h is also undesirable for tag-based modes if we just want to do
> > a kasan_check_byte().
>
> It requires kasan_enabled() definition. I can move both to
> kasan-checks.h if you prefer. However, the only place where
> kasan_check_byte() is currently used includes kasan.h anyway.

Hmm, if it makes too much of a mess, let's just leave as-is.

Thanks,
-- Marco