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

[Andrey Konovalov]

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.