linux-kernel - Re: [PATCH v2 5/5] x86/kasan: Populate shadow for shared chunk of the CPU entry area

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Date:   Mon, 14 Nov 2022 22:46:49 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        syzbot+ffb4f000dc2872c93f62@...kaller.appspotmail.com,
        syzbot+8cdd16fd5a6c0565e227@...kaller.appspotmail.com
Subject: Re: [PATCH v2 5/5] x86/kasan: Populate shadow for shared chunk of
 the CPU entry area

On Mon, Nov 14, 2022 at 05:53:43PM +0000, Sean Christopherson wrote:

> Wrong one, that's the existing mapping.  To get back to v1:
> 
> diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
> index af82046348a0..0302491d799d 100644
> --- a/arch/x86/mm/kasan_init_64.c
> +++ b/arch/x86/mm/kasan_init_64.c
> @@ -416,8 +416,8 @@ void __init kasan_init(void)
>          * area is randomly placed somewhere in the 512GiB range and mapping
>          * the entire 512GiB range is prohibitively expensive.
>          */
> -       kasan_populate_early_shadow((void *)shadow_cea_begin,
> -                                   (void *)shadow_cea_per_cpu_begin);
> +       kasan_populate_shadow(shadow_cea_begin,
> +                             shadow_cea_per_cpu_begin, 0);
>  
>         kasan_populate_early_shadow((void *)shadow_cea_end,
>                         kasan_mem_to_shadow((void *)__START_KERNEL_map));

OK. It now looks like so:

  https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=x86/mm&id=14ca169feec3cb442ef4d322f8f65ba360f42784

If the robots don't hate on it because I fat fingered it or seomthing
stupid, I'll go push it out tomorrow.