linux-kernel - Re: [PATCH] kasan: add kasan mode messages when kasan init

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Date:   Tue, 19 Oct 2021 22:33:54 +0800
From:   Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
To:     Marco Elver <elver@...gle.com>
CC:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chinwen Chang (張錦文) 
        <chinwen.chang@...iatek.com>,
        Yee Lee (李建誼) 
        <Yee.Lee@...iatek.com>,
        Nicholas Tang (鄭秦輝) 
        <nicholas.tang@...iatek.com>,
        "kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH] kasan: add kasan mode messages when kasan init

On Tue, 2021-10-19 at 22:14 +0800, Marco Elver wrote:
> On Tue, 19 Oct 2021 at 14:04, Kuan-Ying Lee <
> Kuan-Ying.Lee@...iatek.com> wrote:
> > 
> > There are multiple kasan modes. It make sense that we add some
> > messages
> > to know which kasan mode is when booting up. see [1].
> > 
> > Link: 
> > https://urldefense.com/v3/__https://bugzilla.kernel.org/show_bug.cgi?id=212195__;!!CTRNKA9wMg0ARbw!374SjX0W47zTqp1xJyIg9CW0T7ggAT1rr981lIRBjQhUk2_495ltG_ZkiW6jmeVDBvu_UA$
> > $  [1]
> > Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
> 
> Looks good, however, you need to rebase to -next because of "kasan:
> Extend KASAN mode kernel parameter"...

Thanks Marco.
I will send the v2.

> 
> > ---
> >  arch/arm64/mm/kasan_init.c | 2 +-
> >  mm/kasan/hw_tags.c         | 4 +++-
> >  mm/kasan/sw_tags.c         | 2 +-
> >  3 files changed, 5 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/arm64/mm/kasan_init.c
> > b/arch/arm64/mm/kasan_init.c
> > index 61b52a92b8b6..b4e78beac285 100644
> > --- a/arch/arm64/mm/kasan_init.c
> > +++ b/arch/arm64/mm/kasan_init.c
> > @@ -293,7 +293,7 @@ void __init kasan_init(void)
> >         kasan_init_depth();
> >  #if defined(CONFIG_KASAN_GENERIC)
> >         /* CONFIG_KASAN_SW_TAGS also requires kasan_init_sw_tags().
> > */
> > -       pr_info("KernelAddressSanitizer initialized\n");
> > +       pr_info("KernelAddressSanitizer initialized (generic)\n");
> >  #endif
> >  }
> > 
> > diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
> > index 05d1e9460e2e..3e28ecbe1d8f 100644
> > --- a/mm/kasan/hw_tags.c
> > +++ b/mm/kasan/hw_tags.c
> > @@ -168,7 +168,9 @@ void __init kasan_init_hw_tags(void)
> >                 break;
> >         }
> > 
> > -       pr_info("KernelAddressSanitizer initialized\n");
> > +       pr_info("KernelAddressSanitizer initialized (hw-tags,
> > mode=%s, stacktrace=%s)\n",
> > +               kasan_flag_async ? "async" : "sync",
> 
> ... which means this will have a 3rd option "asymm".

Thanks for the reminder.

> 
> > +               kasan_stack_collection_enabled() ? "on" : "off");
> >  }
> > 
> >  void kasan_alloc_pages(struct page *page, unsigned int order,
> > gfp_t flags)
> > diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c
> > index bd3f540feb47..77f13f391b57 100644
> > --- a/mm/kasan/sw_tags.c
> > +++ b/mm/kasan/sw_tags.c
> > @@ -42,7 +42,7 @@ void __init kasan_init_sw_tags(void)
> >         for_each_possible_cpu(cpu)
> >                 per_cpu(prng_state, cpu) = (u32)get_cycles();
> > 
> > -       pr_info("KernelAddressSanitizer initialized\n");
> > +       pr_info("KernelAddressSanitizer initialized (sw-tags)\n");
> >  }
> > 
> >  /*
> > --
> > 2.18.0
> 
>