linux-kernel - Re: [PATCH v9 20/44] kasan: rename print_shadow_for_address to print_memory

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Date:   Wed, 11 Nov 2020 16:07:03 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 20/44] kasan: rename print_shadow_for_address to print_memory_metadata

On Tue, Nov 10, 2020 at 11:11 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
>
> This is a preparatory commit for the upcoming addition of a new hardware
> tag-based (MTE-based) KASAN mode.
>
> Hardware tag-based KASAN won't be using shadow memory, but will reuse
> this function. Rename "shadow" to implementation-neutral "metadata".
>
> No functional changes.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Reviewed-by: Marco Elver <elver@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>
> ---
> Change-Id: I18397dddbed6bc6d365ddcaf063a83948e1150a5
> ---
>  mm/kasan/report.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index 2990ca34abaf..5d5733831ad7 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -252,7 +252,7 @@ static int shadow_pointer_offset(const void *row, const void *shadow)
>                 (shadow - row) / SHADOW_BYTES_PER_BLOCK + 1;
>  }
>
> -static void print_shadow_for_address(const void *addr)
> +static void print_memory_metadata(const void *addr)
>  {
>         int i;
>         const void *shadow = kasan_mem_to_shadow(addr);
> @@ -338,7 +338,7 @@ void kasan_report_invalid_free(void *object, unsigned long ip)
>         pr_err("\n");
>         print_address_description(object, tag);
>         pr_err("\n");
> -       print_shadow_for_address(object);
> +       print_memory_metadata(object);
>         end_report(&flags);
>  }
>
> @@ -379,7 +379,7 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write,
>         if (addr_has_metadata(untagged_addr)) {
>                 print_address_description(untagged_addr, get_tag(tagged_addr));
>                 pr_err("\n");
> -               print_shadow_for_address(info.first_bad_addr);
> +               print_memory_metadata(info.first_bad_addr);
>         } else {
>                 dump_stack();
>         }
> --
> 2.29.2.222.g5d2a92d10f8-goog
>


-- 
Alexander Potapenko
Software Engineer

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