From: Andrey Konovalov <andreyknvl@google.com>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Evgenii Stepanov <eugenis@google.com>,
Kostya Serebryany <kcc@google.com>,
Peter Collingbourne <pcc@google.com>,
Serban Constantinescu <serbanc@google.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Elena Petrova <lenaptr@google.com>,
Branislav Rankov <Branislav.Rankov@arm.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
kasan-dev <kasan-dev@googlegroups.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RFC v2 07/21] kasan, arm64: move initialization message
Date: Tue, 3 Nov 2020 16:33:54 +0100 [thread overview]
Message-ID: <CAAeHK+xBZ_Rkew==1pj1YzU9XGdMJx5_uMP6n=BnnqdAH7LARw@mail.gmail.com> (raw)
In-Reply-To: <CAAeHK+wqdtPkrhbxPanu79iCJxdYczKQ6k7+8u-hnC5JONEgNQ@mail.gmail.com>
On Thu, Oct 29, 2020 at 9:14 PM Andrey Konovalov <andreyknvl@google.com> wrote:
>
> On Wed, Oct 28, 2020 at 11:56 AM Dmitry Vyukov <dvyukov@google.com> wrote:
> >
> > On Thu, Oct 22, 2020 at 3:19 PM Andrey Konovalov <andreyknvl@google.com> wrote:
> > >
> > > Tag-based KASAN modes are fully initialized with kasan_init_tags(),
> > > while the generic mode only requireds kasan_init(). Move the
> > > initialization message for tag-based modes into kasan_init_tags().
> > >
> > > Also fix pr_fmt() usage for KASAN code: generic mode doesn't need it,
> >
> > Why doesn't it need it? What's the difference with tag modes?
>
> I need to reword the patch descriptions: it's not the mode that
> doesn't need it, it's the generic.c file, as it doesn't use any pr_*()
> functions.
>
> >
> > > tag-based modes should use "kasan:" instead of KBUILD_MODNAME.
> >
> > With generic KASAN I currently see:
> >
> > [ 0.571473][ T0] kasan: KernelAddressSanitizer initialized
> >
> > So KBUILD_MODNAME somehow works. Is there some difference between files?
>
> That code is printed from arch/xxx/mm/kasan_init*.c, which has its own
> pr_fmt defined.
>
> >
> > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> > > Link: https://linux-review.googlesource.com/id/Idfd1e50625ffdf42dfc3dbf7455b11bd200a0a49
> > > ---
> > > arch/arm64/mm/kasan_init.c | 3 +++
> > > mm/kasan/generic.c | 2 --
> > > mm/kasan/hw_tags.c | 4 ++++
> > > mm/kasan/sw_tags.c | 4 +++-
> > > 4 files changed, 10 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
> > > index b6b9d55bb72e..8f17fa834b62 100644
> > > --- a/arch/arm64/mm/kasan_init.c
> > > +++ b/arch/arm64/mm/kasan_init.c
> > > @@ -290,5 +290,8 @@ void __init kasan_init(void)
> > > {
> > > kasan_init_shadow();
> > > kasan_init_depth();
> > > +#if defined(CONFIG_KASAN_GENERIC)
> > > + /* CONFIG_KASAN_SW/HW_TAGS also requires kasan_init_tags(). */
> >
> > A bit cleaner way may be to introduce kasan_init_early() and
> > kasan_init_late(). Late() will do tag init and always print the
> > message.
>
> It appears we'll also need kasan_init_even_later() for some
> MTE-related stuff. I'll try to figure out some sane naming scheme here
> and include it into the next version.
Actually, it looks like some arches already have
kasan_init_early/late() along with kasan_init(). I'd say we better
keep those for generic KASAN mode, and kasan_init_tags() for tag-based
modes.
next prev parent reply other threads:[~2020-11-03 15:34 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-22 13:18 [PATCH RFC v2 00/21] kasan: hardware tag-based mode for production use on arm64 Andrey Konovalov
2020-10-22 13:18 ` [PATCH RFC v2 01/21] kasan: simplify quarantine_put call site Andrey Konovalov
2020-10-27 12:40 ` Dmitry Vyukov
2020-10-22 13:18 ` [PATCH RFC v2 02/21] kasan: rename get_alloc/free_info Andrey Konovalov
2020-10-27 12:40 ` Dmitry Vyukov
2020-10-22 13:18 ` [PATCH RFC v2 03/21] kasan: introduce set_alloc_info Andrey Konovalov
2020-10-27 12:41 ` Dmitry Vyukov
2020-10-22 13:18 ` [PATCH RFC v2 04/21] kasan: unpoison stack only with CONFIG_KASAN_STACK Andrey Konovalov
2020-10-27 12:44 ` Dmitry Vyukov
2020-10-27 12:45 ` Dmitry Vyukov
2020-10-29 19:57 ` Andrey Konovalov
2020-11-16 10:59 ` Dmitry Vyukov
2020-11-16 11:50 ` Marco Elver
2020-11-16 12:16 ` Catalin Marinas
2020-11-16 12:19 ` Dmitry Vyukov
2020-11-16 12:45 ` Vincenzo Frascino
2020-11-16 13:50 ` Andrey Konovalov
2020-11-16 14:50 ` Vincenzo Frascino
2020-10-22 13:18 ` [PATCH RFC v2 05/21] kasan: allow VMAP_STACK for HW_TAGS mode Andrey Konovalov
2020-10-27 12:49 ` Dmitry Vyukov
2020-10-29 20:00 ` Andrey Konovalov
2020-10-22 13:18 ` [PATCH RFC v2 06/21] kasan: mark kasan_init_tags as __init Andrey Konovalov
2020-10-28 10:08 ` Dmitry Vyukov
2020-10-29 20:08 ` Andrey Konovalov
2020-10-22 13:18 ` [PATCH RFC v2 07/21] kasan, arm64: move initialization message Andrey Konovalov
2020-10-28 10:55 ` Dmitry Vyukov
2020-10-29 20:14 ` Andrey Konovalov
2020-11-03 15:33 ` Andrey Konovalov [this message]
2020-10-22 13:19 ` [PATCH RFC v2 08/21] kasan: remove __kasan_unpoison_stack Andrey Konovalov
2020-10-28 10:57 ` Dmitry Vyukov
2020-10-22 13:19 ` [PATCH RFC v2 09/21] kasan: inline kasan_reset_tag for tag-based modes Andrey Konovalov
2020-10-28 11:05 ` Dmitry Vyukov
2020-10-30 16:19 ` Andrey Konovalov
2020-10-22 13:19 ` [PATCH RFC v2 10/21] kasan: inline random_tag for HW_TAGS Andrey Konovalov
2020-10-28 11:08 ` Dmitry Vyukov
2020-10-30 15:48 ` Andrey Konovalov
2020-10-30 16:07 ` Andrey Konovalov
2020-10-22 13:19 ` [PATCH RFC v2 11/21] kasan: inline kasan_poison_memory and check_invalid_free Andrey Konovalov
2020-10-28 11:29 ` Dmitry Vyukov
2020-10-22 13:19 ` [PATCH RFC v2 12/21] kasan: inline and rename kasan_unpoison_memory Andrey Konovalov
2020-10-28 11:36 ` Dmitry Vyukov
2020-10-30 16:34 ` Andrey Konovalov
2020-10-30 17:46 ` Dmitry Vyukov
2020-10-22 13:19 ` [PATCH RFC v2 13/21] arm64: kasan: Add cpu_supports_tags helper Andrey Konovalov
2020-10-28 11:38 ` Dmitry Vyukov
2020-10-22 13:19 ` [PATCH RFC v2 14/21] kasan: add and integrate kasan boot parameters Andrey Konovalov
2020-10-22 18:50 ` Marco Elver
2020-10-22 20:28 ` Andrey Konovalov
2020-10-28 12:27 ` Dmitry Vyukov
2020-10-30 19:30 ` Andrey Konovalov
2020-10-30 14:45 ` Marco Elver
2020-10-30 19:30 ` Andrey Konovalov
2020-10-22 13:19 ` [PATCH RFC v2 15/21] kasan: check kasan_enabled in annotations Andrey Konovalov
2020-10-28 16:47 ` Dmitry Vyukov
2020-10-30 19:47 ` Andrey Konovalov
2020-10-22 13:19 ` [PATCH RFC v2 16/21] kasan: optimize poisoning in kmalloc and krealloc Andrey Konovalov
2020-10-28 16:55 ` Dmitry Vyukov
2020-11-02 15:17 ` Andrey Konovalov
2020-10-22 13:19 ` [PATCH RFC v2 17/21] kasan: simplify kasan_poison_kfree Andrey Konovalov
2020-10-28 16:57 ` Dmitry Vyukov
2020-10-22 13:19 ` [PATCH RFC v2 18/21] kasan: rename kasan_poison_kfree Andrey Konovalov
2020-10-28 16:58 ` Dmitry Vyukov
2020-10-22 13:19 ` [PATCH RFC v2 19/21] kasan: don't round_up too much Andrey Konovalov
2020-10-28 17:01 ` Dmitry Vyukov
2020-10-22 13:19 ` [PATCH RFC v2 20/21] kasan: simplify assign_tag and set_tag calls Andrey Konovalov
2020-10-28 17:03 ` Dmitry Vyukov
2020-10-22 13:19 ` [PATCH RFC v2 21/21] kasan: clarify comment in __kasan_kfree_large Andrey Konovalov
2020-10-28 17:04 ` Dmitry Vyukov
2020-10-22 15:15 ` [PATCH RFC v2 00/21] kasan: hardware tag-based mode for production use on arm64 Dmitry Vyukov
2020-10-22 17:00 ` Andrey Konovalov
2020-10-22 18:29 ` Kostya Serebryany
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