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Message-ID: <CAAeHK+zD17_esgDvsUd3Yku4cCKDdADo82_u3c47tMWtHL63oQ@mail.gmail.com>
Date: Thu, 14 Jan 2021 19:01:40 +0100
From: Andrey Konovalov <andreyknvl@...gle.com>
To: Marco Elver <elver@...gle.com>
Cc: Catalin Marinas <catalin.marinas@....com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Will Deacon <will.deacon@....com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Peter Collingbourne <pcc@...gle.com>,
Evgenii Stepanov <eugenis@...gle.com>,
Branislav Rankov <Branislav.Rankov@....com>,
Kevin Brodsky <kevin.brodsky@....com>,
kasan-dev <kasan-dev@...glegroups.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux Memory Management List <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 11/14] kasan: fix bug detection via ksize for HW_TAGS mode
On Wed, Jan 13, 2021 at 5:54 PM Marco Elver <elver@...gle.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.
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