linux-kernel - Re: [PATCH v2 0/5] x86/kasan: Bug fixes for recent CEA changes

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Date:   Mon, 14 Nov 2022 12:57:54 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     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, Andrey Ryabinin <ryabinin.a.a@...il.com>,
        "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 0/5] x86/kasan: Bug fixes for recent CEA changes

On Thu, Nov 10, 2022 at 08:34:59PM +0000, Sean Christopherson wrote:
> Three fixes for the recent changes to how KASAN populates shadows for
> the per-CPU portion of the CPU entry areas.  The v1 versions were posted
> independently as I kept root causing issues after posting individual fixes.
> 
> v2:
>   - Map the entire per-CPU area in one shot. [Andrey]
>   - Use the "early", i.e. read-only, variant to populate the shadow for
>     the shared portion (read-only IDT mapping) of the CEA. [Andrey]
> 
> v1:
>   - https://lore.kernel.org/all/20221104212433.1339826-1-seanjc@google.com
>   - https://lore.kernel.org/all/20221104220053.1702977-1-seanjc@google.com
>   - https://lore.kernel.org/all/20221104183247.834988-1-seanjc@google.com
> 
> Sean Christopherson (5):
>   x86/mm: Recompute physical address for every page of per-CPU CEA
>     mapping
>   x86/mm: Populate KASAN shadow for entire per-CPU range of CPU entry
>     area
>   x86/kasan: Rename local CPU_ENTRY_AREA variables to shorten names
>   x86/kasan: Add helpers to align shadow addresses up and down
>   x86/kasan: Populate shadow for shared chunk of the CPU entry area
> 
>  arch/x86/mm/cpu_entry_area.c | 10 +++-----
>  arch/x86/mm/kasan_init_64.c  | 50 +++++++++++++++++++++++-------------
>  2 files changed, 36 insertions(+), 24 deletions(-)

Thanks for cleaning up that mess!