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From:   Jann Horn <jannh@google.com>
Date:   Tue, 3 Nov 2020 23:17:26 +0100
Message-ID: <CAG48ez34gt7_itkCHiz6z__oepD89=sYWu11=3aq8ASV8ph5pQ@mail.gmail.com>
Subject: Re: [PATCH v7 3/9] arm64, kfence: enable KFENCE for ARM64
To:     Marco Elver <elver@google.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Alexander Potapenko <glider@google.com>,
        "H . Peter Anvin" <hpa@zytor.com>,
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        Dave Hansen <dave.hansen@linux.intel.com>,
        David Rientjes <rientjes@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
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On Tue, Nov 3, 2020 at 6:59 PM Marco Elver <elver@google.com> wrote:
> Add architecture specific implementation details for KFENCE and enable
> KFENCE for the arm64 architecture. In particular, this implements the
> required interface in <asm/kfence.h>.
>
> KFENCE requires that attributes for pages from its memory pool can
> individually be set. Therefore, force the entire linear map to be mapped
> at page granularity. Doing so may result in extra memory allocated for
> page tables in case rodata=full is not set; however, currently
> CONFIG_RODATA_FULL_DEFAULT_ENABLED=y is the default, and the common case
> is therefore not affected by this change.
>
> Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
> Co-developed-by: Alexander Potapenko <glider@google.com>
> Signed-off-by: Alexander Potapenko <glider@google.com>
> Signed-off-by: Marco Elver <elver@google.com>

Reviewed-by: Jann Horn <jannh@google.com>